Temat: carbon isotopes - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Zapis izotopów tlenu i węgla w kopalnych osadach jeziornych stanowisk Sucha Wieś (Pojezierze Ełckie) i Czarnucha (Równina Augustowska), północno-wschodnia Polska
The isotopic record in ancient lacustrine deposits of the Sucha Wieś (Ełk Lakeland) and Czarnucha Sites (Augustów Plain), northeastern Poland
Autorzy:: Nitychoruk, J.
Powiązania:: https://bibliotekanauki.pl/articles/2063328.pdf
Data publikacji:: 2009
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: izotopy tlenu i węgla
osady jeziorne
interglacjał augustowski
Pojezierze Ełckie
Równina Augustowska
oxygen and carbon isotopes
lake sediments
Augustovian Interglacial
Ełk Lakeland
Augustów Plain
Opis:: Badania stosunków izotopów tlenu i węgla w kopalnych osadach zbiornikowych kompleksu augustowskiego, w stanowiskach Sucha Wieś i Czarnucha w północno-wschodniej Polsce, pokazują złożony obraz zmian klimatu, w którym występują przynajmniej dwa ocieplenia. Detrytyczny kalcyt występujący w obrębie kopalnych osadów jeziornych utrudnia interpretację stosunków izotopowych. Zaznaczający się w osadach wzrost zawartości kalcytu pochodzenia morskiego, ze starszych formacji, jest charakterystyczny dla zimnych okresów interglacjału augustowskiego, w którym następowało rozrzedzenie pokrywy roślinnej ułatwiające spłukiwanie osadów, co jest wyrażone w postaci wysokich wartości δ. Tam, gdzie przeważa kalcyt autochtoniczny powstały w zbiorniku czwartorzędowym, wartości δ maleją. Stwierdzenie obecności okrzemek słonawowodnych we wszystkich profilach osadów może wskazywać na okresowe przesuszenia jezior. W takich warunkach dochodziło do koncentracji izotopów cięższych, co objawia się wysokimi wartościami δ.
Investigations of the O/C ratio in ancient deposits of the Augustovian complex of the Sucha Wieś and Czarnucha sites, northern Poland, indicate a complicated image of climate changes with at least two warmings. Detrital calcite, found in the ancient lacustrine deposits, makes it difficult to interpret the isotope ratio. An increase in content of marine calcite derived from older formations is characteristic of cool periods of the Augustovian when the vegetation was sparse, favouring washout of the particles, as evidenced by high δ values. If there is apredominance of autochthonous calcite deposited in the Quaternary basin, then the δ values are lower. The presence of saline-water diatoms in all the sections can indicate a periodic drying up of the lakes when heavier isotopes were being concentrated resulting in high δ values.
Źródło:: Biuletyn Państwowego Instytutu Geologicznego; 2009, 435; 75--84
0867-6143
Pojawia się w:: Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Thermogenic gases generated from coals and shales of the Upper Silesian and Lublin basins : hydrous pyrolysis approach
Autorzy:: Kotarba, Maciej J.
Bilkiewicz, Elżbieta
Jurek, Krzysztof
Waliczek, Marta
Więcław, Dariusz
Zych, Hieronim
Powiązania:: https://bibliotekanauki.pl/articles/2059608.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: hydrous pyrolysis gas
gaseous hydrocarbon
carbon dioxide
molecular nitrogen
stable C, H, N isotopes
Upper Silesian
Lublin Coal basins
Opis:: In order to provide a better characterization of the origin and volume of thermogenic gas generation hydrous pyrolysis (HP) experiments were performed on coals and shales at 330 and 360oC for 72 hours. The maturity range of coals and shales used for HP varies from 0.57 to 0.92% Ro. The maturity increase caused by HP at 330 and 360oC ranges from 1.32 to 1.39% and from 1.71 to 1.83%, respectively. δ13C of CH4, 2H6, C3H6 and n-C4H10 in HP gases versus their reciprocal C-number have a concave relationship, and therefore do not follow a linear trend. δ2H of CH4, 2H6 and C3H6 in HP gases versus their reciprocal H-number show both linear and convex-concave relationships. The growth of CO2 yields during HP was higher for shales than for coals. H2S yields from shales are higher than from coals, which can be connected with catalytic and adsorbed influence of shale matrix. H2 was also generated in notable quantities from water and organic matter of coals and bigger amounts from shales. N2 yields grow with the increase of Ro after 3oC HP and it is more enriched in 15N isotope than after 330C.
Źródło:: Geological Quarterly; 2021, 65, 2; 65: 26
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: The Wenlock-Ludlow carbon isotope trend in the Vidukle core, Lithuania, and its relations with oceanic events
Autorzy:: Martma, T.
Brazauskas, A.
Kaljo, D.
Kaminskas, D.
Musteikis, P.
Powiązania:: https://bibliotekanauki.pl/articles/2058950.pdf
Data publikacji:: 2005
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Lithuania
Silurian
carbon isotopes
oceanic events
sedimentary facies
Opis:: A Wenlock to Ludlow terrigenous-carbonate succession in the Vidukle core in Central Lithuania represents a deep shelf environment with a general upwards-shallowing trend, interrupted by brief deepening episodes. The carbon isotope trend, based on 115 whole-rock analyses, shows three main excursions: (1) a major excursion (δ13 C values reach 3.2‰) in the lower Wenlock, (2) low shifts (1.3‰ and 1.6‰) at two levels in the upper most Wenlock Siesartis Formation corresponding to the Monograptus ludensis Biozone, (3) the most prominent excursion (δ13 C values reach 8.2‰) occurs in the upper Ludlow Mituva Fm. The upper Ludlow excursion is dated by the last occurrences of Polygnathoides siluricus below the main shift and the appearance of Ozarkodina wimani and O. crispa above the excursion. The excursion stratigraphically coincides with the Lau oceanic Event and is correlated with the mid-Ludfordian Neocucullograptus kozlowskii-Bohemograptus bohemicus tenuis Biozone. Changes in the carbon isotope trend are in general harmony with some aspects of the rock (CaO, terrigenous component) and fossil content of the section. The data presented are consistent with an arid climate model for the Ludfordian isotope event.
Źródło:: Geological Quarterly; 2005, 49, 2; 223--234
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: The Jurassic–Cretaceous transition in the High-Tatric succession (Giewont Unit, Western Tatra Mts, Poland): integrated stratigraphy and microfacies
Autorzy:: Lodowski, Damian Gerard
Pszczółkowski, Andrzej
Wilamowski, Andrzej
Grabowski, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/2023960.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microfossils
rock magnetism
carbon isotopes
Western Carpathians
Tatra Mountains
mikroskamieniałości
skała magnetyczna
izotopy węgla
Karpaty Zachodnie
Tatry
Opis:: Herein are presented the results of detailed bio - (calcareous dinocysts, calpionellids, foraminifers, saccocomids) and chemostratigraphic (δ13C) studies combined with high-resolution microfacies, rock magnetic and gamma-ray spectrometry (GRS) investigations performed on the upper Kimmeridgian-upper Valanginian carbonates of the Giewont succession (Tatricum, Giewont and Mały Giewont sections, Western Tatra Mountains, Poland). The interval studied covers the contact between the Raptawicka Turnia Limestone (RTL) Fm. and the Wysoka Turnia Limestone (WTL) Fm. Their sedimentary sequence is composed of micrites, pseudonodular limestones, cyanoid packstones, lithoclastic packstone and encrinites. A precise correlation with the previously published Mały Giewont section is ensured by biostratigraphy, rock magnetic and GRS logs. The methodology adopted has enabled the recognition of two stratigraphic discontinuities, approximated here as corresponding to the latest Tithonian-early (late?) Berriasian and the early Valanginian. The hiatuses are evidenced by biostratigraphic data and the microfacies succession as well as by perturbations in isotopic compositions and rock magnetic logs; they are thought to result from a conjunction of tectonic activity and eustatic changes. A modified lithostratigraphic scheme for the Giewont and the Osobita High-Tatric successions is proposed. The top of the RTL Fm. falls in the upper Tithonian, where cyanoid packstones disappear. At the base of the WTL Fm. a new Giewont Member is defined as consisting of a basal lithoclastic packstone and following encrinites.
Źródło:: Acta Geologica Polonica; 2022, 72, 1; 107--135
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Terreneuvian stratigraphy and faunas from the Anabar Uplift, Siberia
Autorzy:: Kouchinsky, Artem
Bengtson, Stefan
Landing, Ed
Steiner, Michael
Vendrasco, Michael
Ziegler, Karen
Powiązania:: https://bibliotekanauki.pl/articles/945221.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: mollusca
small shelly fossils
stratigraphy
carbon isotopes
cambrian
terreneuvian
russia
siberia
anabar
Opis:: Assemblages of mineralized skeletal fossils are described from limestone rocks of the lower Cambrian Nemakit-Daldyn, Medvezhya, Kugda-Yuryakh, Manykay, and lower Emyaksin formations exposed on the western and eastern flanks of the Anabar Uplift of the northern Siberian Platform. The skeletal fossil assemblages consist mainly of anabaritids, molluscs, and hyoliths, and also contain other taxa such as Blastulospongia, Chancelloria, Fomitchella, Hyolithellus, Platysolenites, Protohertzina, and Tianzhushanella. The first tianzhushanellids from Siberia, including Tianzhushanella tolli sp. nov., are described. The morphological variation of Protohertzina anabarica and Anabarites trisulcatus from their type locality is documented. Prominent longitudinal keels in the anabaritid Selindeochrea tripartita are demonstrated. Among the earliest molluscs from the Nemakit-Daldyn Formation, Purella and Yunnanopleura are interpreted as shelly parts of the same species. Fibrous microstructure of the outer layer and a wrinkled inner layer of mineralised cuticle in the organophosphatic sclerites of Fomitchella are reported. A siliceous composition of the globular fossil Blastulospongia is reported herein and a possible protistan affinity similar to Platysolenites is discussed. New carbon isotope data facilitate correlation both across the Anabar Uplift and with the Terreneuvian Series of the IUGS chronostratigraphical scheme for the Cambrian System. The base of Cambrian Stage 2 is provisionally placed herein within the Fortunian‒Cambrian Stage 2 transitional interval bracketed by the lowest appearance of Watsonella crosbyi and by a slightly higher horizon at the peak of carbon isotope excursion Iʹ from western flank of the Anabar Uplift. Correlation across the Siberian Platform of the fossiliferous Medvezhya and lower Emyaksin formations showing δ¹³C carb excursion Iʹ with the upper Sukharikha Formation containing excursion 5p and upper Ust’-Yudoma Formation containing excursion I is supported herein.
Źródło:: Acta Palaeontologica Polonica; 2017, 62, 2; 311-440
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Surface geochemical survey at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
Autorzy:: Sechman, H.
Kotarba, M. J.
Dzieniewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/191493.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: surface geochemical survey
stable carbon isotopes
methane origin
gaseous hydrocar bon C2-C5
carbon dioxide origin
woolly rhinoceros
Starunia
Carpathian region
Ukraine
Opis:: A surface geochemical survey was carried out in an abandoned ozokerite mine in Starunia, where remnants of a mammoth and three woolly rhinoceroses and one almost completely preserved rhinoceros carcass were found in 1907 and 1929. In total, 689 measurement sites were defined within the selected 300×350 m rectangle (ca. 10.5 ha). The analysed soil gases vary in their molecular and isotopic compositions. Several zones with anomalous methane concentrations over 10 vol% were identified in the study area. These anomalous concentrations correlate well with total C2-C5 alkane anomalies (over 1 vol%). The zones with carbon dioxide concentrations over 15 vol% are generally shifted SW of those, where the methane and the sum of C2-C5 alkanes anomalies were identified. High helium concentrations of crustal origin (over 0.001 vol%) are clustered near fault zones. In a majority of cases methane is of thermogenic origin, migrating to the near-surface zone from deep-seated accumulations. Microbial methane, or methane with a high microbial component, is genetically related to recent swamps. The high variability of concentrations of gaseous components together with the highly variable isotopic composition of individual gases in the soil, indicate their thermogenic and/or microbial origin, and point to the lithological diversity of Quaternary sediments in the study area. Several zones with thermogenic gaseous hydrocarbons and helium were delineated. It is likely that during the Pleistocene winters, under a thick ice and snow cover, the tundra lake and swamp zones around outflows of brines, oil, helium and thermogenic gases had a higher temperature, which resulted in melting and cracking of the ice cover. These sites would be more prospective for future search of well-preserved large vertebrates.
Źródło:: Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 375-390
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Sulphate reduction - methane oxidation: a potential role of this process in the origin of C isotope environmental record in freshwater carbonates
Autorzy:: Jędrysek, M. O.
Powiązania:: https://bibliotekanauki.pl/articles/1186076.pdf
Data publikacji:: 2005
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: woda słodka
węgiel
tlen
siarka
metan
węglany
siarczany
izotopy
antropopresja
fresh water
carbon
oxygen
sulphur
methane
carbonates
sulphates
isotopes
anthropogenic impact
Opis:: W pracy wykazano, że węglany jeziorne powstałe w wyniku mikrobiologicznego utleniania związków organicznych (w tym metanu), przy redukcji jonów siarczanowych, mogą stanowić ważny geochemiczny zapis zmian środowiskowych. Najprawdopodobniej niskie wartości 13C w kalcycie, w rzekach i jeziorach eutroficznych wynikają z silnego utleniania związków organicznych w warunkach turbulencji i/lub podwyższonych stężeń siarczanu. Podobnie, wysokie wartości 13C w kalcycie, zawartym w osadach słodkowodnych bogatych w materię organiczną, mogą wskazywać na niski potencjał redox. Na podstawie tego typu badania wydaje się możliwe wykalibrowanie nowego narzędzia do rekonstrukcji palaeośrodowiskowych. Z drugiej strony, utlenianie metanu (związków organicznych) może powodować wzbogacenie rezydualnego jonu siarczanowego w ciężkie izotopy tlenu i siarki. Dlatego, aby lepiej zrozumieć sygnał izotopowy w węglanach jeziornych, wykonano badania stężenia i badania izotopowe siarczanu kolumny wodnej oraz badania metanu i kalcytu w osadach 24 jezior, 2 stawów i 4 rzek w Polsce. Rozpuszczony jon siarczanowy jest jednym z głównych składników rozpuszczonych w wodach jeziornych, a siarka, jako istotny biopierwiastek, wpływa na procesy zachodzące w jeziorach, w tym na jakość wód (mikrobiologiczny rozkład związków organicznych, inhibitor metanogenezy). Najwyższe stężenie jonu siarczanowego stwierdzono w rzekach (85,47 ncentration of sulphate has been detected in rivers (85.47 SO42- mg/l) i sztucznym jeziorze (70,3 SO42 -42- mg/l) w regionie silnego zanieczyszczenia (tzw. "Czarny Trójkąt") w Polsce południowo-zachodniej. Najniższe stężenie siarczanu stwierdzono w jeziorach dystroficznych i oligotroficznych - górskich (od 0,5 do 3 mg/l SOSO42 -). Najniższe wartości δ34S(SO42-) i δ18O(SO42-) występują w niezanieczyszczonych jeziorach wschodniej Polski (-0,94 i 1,38‰). Najwyższe wartości δ34S(SO42-) i δ18O(SO42-) stwierdzono w Polsce zachodniej i jeziorach dystroficznych (12,95 i 16,15‰). Wykazano, że. δ34S(SO42- i δ18O(SO42-) jezior mogą być dobrym narzędziem do ilościowej charakterystyki antropopresji (kwaśne opady) oraz do monitorowania zmian trofii i procesów redoks związanych z biodegradacją związków organicznych w osadach i kolumnie wodnej. W przeciwieństwie do czystych jezior, jeziora silnie zanieczyszczone jonem siarczanowym wykazują wzrost wartościδ13C(CH4) wraz ze wzrostem głębokości kolumny wodnej. Może to być wskaźnikiem utraty przez jezioro mikrobiologicznej zdolności buforującej.
Źródło:: Polish Geological Institute Special Papers; 2005, 16; 18--34
1507-9791
Pojawia się w:: Polish Geological Institute Special Papers
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Stable isotope composition of carbonates in loess at the Carpathian margin (SE Poland)
Autorzy:: Łącka, Bożena
Łanczont, Maria
Komar, Maryna
Madeyska, Teresa
Powiązania:: https://bibliotekanauki.pl/articles/2026059.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: loess
authigenic carbonates
carbon and oxygen stable isotopes
Vistulian
Opis:: Sam ples for the study were col lected from, known from the lit era ture, out crop pro files in Zar zecze, Ra dymno, Dybawka, Tarnawce and Pikulice- Nehrybka, situ ated at the Car pa thian bor der, in the vi cin ity of the Prze myoel town, close to the San River val ley (SE Po land). They rep re sent the Vis tulian loess- palaeosol se quences. Car bon ates oc cur mainly in the lo esses rep re sent ing OIS 2 and 3. Pol len analy sis, car ried out for two pro files (Tarnawce, Ra dymno), throws light on pa laeoe co logi cal con di tions of loess cover for ma tion and trans for ma tion. Iso topic analy sis of authigenic car bon ates was car ried out on car bon ate ce mented bod ies dis persed through out the loess in forms of nod ule, rhi zolith and rhi zo cre tion and on bio clasts, mainly snail shells, os tra cod valves, and sparse glob ules (proba bly the in ter nal shells of the na ked snails). In the suc ces sions stud ied, the up per Vistulian loess de pos ited in en vi ron ment with poor veg e ta tion, con tains rhizoliths and rhizocretions mainly, while in the mid dle and lower Vistulian loess with well de vel oped soils, gley ho ri zons, and in ter ca la tions of sub aque ous sed i ments, re mains of snail shells and ostracod valves pre vail. The two main forms of car bon ates dif fer mark edly in iso to pic com po si tion from one an other. These dif fer ences seem to be more im por tant than those be tween sam ples of one form of car bon ates along par tic u lar sec tions. That is the re sult of nu mer ous fac tors af fect ing the frac tion ation of car bon and, in par tic u lar, ox y gen sta ble iso topes in the en vi ron ment of pre cip i ta tion of authigenic cal cite. The iso to pic com po si tion of car bon ates ce ment ing sed i ments is con trolled mainly by biomineralization of or ganic mat ter and lo cal cli ma tic pa ram e ters which were rather slightly dif fer en ti ated dur ing the for ma tion of the stud ied sed i ments. The d13C val ues for bioclasts vary in a broader range than for calcitic ce ments. Usu ally the snail shell car bon ate is more en riched with heavier car bon iso tope than that from ostracod valves, re sult ing from the iso to pic equi lib rium with pre cip i ta tion and with sur face wa ters, re spec tively. Bas ing on our study we can con clude that fluc tu a tions of iso tope com po si tion of authigenic car bon ates make it hard to ap ply as a paleoclimatic in di ca tor. How - ever, the gen eral trend of d18O vari a tion in ana lysed car bon ate frac tions from leoss-palaeosol se quences dis plays some con nec tions with cli ma tic fluc tu a tions.
Źródło:: Studia Quaternaria; 2008, 25; 3-21
1641-5558
2300-0384
Pojawia się w:: Studia Quaternaria
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: Stable isotope composition of carbon dioxide emitted from anthropogenic sources in the Kraków region, Southern Poland
Autorzy:: Zimnoch, M.
Powiązania:: https://bibliotekanauki.pl/articles/148175.pdf
Data publikacji:: 2009
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: stable isotopes
carbon dioxide
anthropogenic sources
Kraków
Opis:: The summary of the measurements of CO2 stable isotopic composition emitted from different anthropogenic sources in the Krakow region is presented. The sources are divided into three main groups . high emission (electric and heat power plants), low emission (coal and methane burning in the households) and car traffic (gasoline, diesel and LPG supplied engines equipped and not equipped with catalyst). Presented results include two measurement campaigns made in the years 1995 and 2000. The measurements revealed three well-defined groups with respect to carbon isotope composition (delta13CVPDB): .30.60 plus-minus sign 0.37 per mille (thousand) sign (car traffic) .23.82 plus-minus sign 0.10 per mille (thousand) sign (coal burning) and .51.8 plus-minus sign 1.1per mille (thousand) sign (methane burning). The oxygen isotope composition (delta18OVPDB-CO2) of CO2 varied in a broad range, from ca. .11per mille (thousand) sign to ca. .22 per mille (thousand) sign, the most negative values being observed for coal and methane burning and the most positive for cars equipped with a catalyst. No significant isotopic shift has been observed between two measurement campaigns.
Źródło:: Nukleonika; 2009, 54, 4; 291-295
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 10.

Tytuł:: Stable carbon and nitrogen isotopes and elemental composition and origin of organic matter from the Neogene Euphrates, Injana and Dibdibba formations in Iraq : discrimination between marine and terrestrial environments
Autorzy:: Awadh, S. M.
Powiązania:: https://bibliotekanauki.pl/articles/2060490.pdf
Data publikacji:: 2014
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: stable carbon isotopes
stable nitrogen isotopes
organic matter
marine environment
terrestrial environment
palaeoenvironment
Iraq
Opis:: Three Neogene sedimentary formations reflecting different depositional environments have been investigated for the purpose of diagnosing the isotopic source of the sedimentary organic matter and their palaeoenvironmental significance in discriminating between marine and terrestrial environments. One of these formations is composed of carbonate and marl of a shallow-marine environment (Euphrates Formation), and the other formations are composed of a clastic terrestrial (fluviatile) deposits with some differences in the depositional conditions (Injana and Dibdibba formations). The isotopic δ¹³C%, δ¹⁵N% values, organic carbon (OC) and total nitrogen contents, and atomic C/N ratios are used as evidence of depositional environment. Average δ¹³C values (in ‰) for the Dibdiba, Injana and Euphrates formations are –25.4, –25.7 and –24.5, respectively; average δ¹⁵N values (in ‰) are 4.44, 5.24 and 7.24 and average OC (in wt.%) is 0.13, 0.3 and 1.1, respectively. A significant variation in the stable carbon and nitrogen isotope compositions between fluvial and marine deposits was recorded. The δC, δ¹⁵N and C/N values indicate that the organic matter in the Euphrates Formation is of marine origin, whereas it is of terrestrial origin (fluviatile) in the Injana and Dibdibba formations. The C/Natomic values are mostly high in the Injana (37) and Dibddiba formations (51), suggesting greater input and/or preservation of terrestrial organic matter derived from land plants; the shallow-marine environment (Euphrates Formation) was characterized by a low C/N ratio (9) due to the algal-derived organic matter with limited input of terrestrial organic matter.
Źródło:: Geological Quarterly; 2014, 58, 4; 729--736
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 11.

Tytuł:: Środowisko sedymentacji i wczesna diageneza czarnych łupków ogniwa Passhatten (środkowy trias, Spitsbergen, Svalbard) na podstawie analizy geochemicznej
Sedimentary environment and early diagenesis of the Passhatten Member black shales (Middle Triassic, Spitsbergen, Svalbard) in the light of geochemical analysis
Autorzy:: Karcz, P.
Powiązania:: https://bibliotekanauki.pl/articles/2074632.pdf
Data publikacji:: 2009
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: izotopy siarki
węgiel organiczny
czarne łupki
trias środkowy
ogniwa Passhatten
Spitsbergen
sulphur isotopes
organic carbon
black shales
Middle Triassic
Passhatten Member
Opis:: Geochemical analysis of the 50 samples of the Middle Triassic black shales (organic carbon-rich siltstones) has been carried out. The black shale samples (up to 4.92 % TOC) have been collected in the stratotype profile of the Bravaisberget Formation, west Spitsbergen. In the examined profile, the black shales occur exclusively in the Passhatten Member (the lower and middle interval of the Bravaisberget Formation). Black shale samples have been analyzed in respect to degree of pyritization (DOP), isotopic composition of pyrite sulphur (34S) and organic carbon content (TOC). The main goal of the research was to examine a degree of oxygenation and dynamics of a sea-bottom environment. DOPvalues from lower section of the Passhatten Member show wide variation, ranging from 0.29 to 0.92. In upper section of the member, the obtained DOPvalues show narrower range of variations, from 0.77 to 0.98.Wide variations of DOPwere caused by temporary coexistence of oxic and anoxic bottom currents. In turn, narrow DOP variations indicate predominance of stratified water and anoxic bottom currents. DOP/34S and DOP/TOC ratios imply that syngenetic and early diagenetic pyrite precipitation during accumulation of the lower section of the Passhatten Member was controlled by availability of organic carbon and reactive iron, whereas accumulation of the member's upper section was controlled exclusively by availability of reactive iron.
Źródło:: Przegląd Geologiczny; 2009, 57, 10; 918-926
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 12.

Tytuł:: Skład izotopowy dwutlenku węgla w atmosferze Krakowa
Isotopic composition of carbon dioxide in the atmosphere of Kraków
Autorzy:: Jasiek, Alina
Zimnoch, Mirosław
Różański, Kazimierz
Powiązania:: https://bibliotekanauki.pl/articles/578341.pdf
Data publikacji:: 2016
Wydawca:: Łódzkie Towarzystwo Naukowe
Tematy:: izotopy trwałe
dwutlenek węgla
izotopowy bilans masy
stable isotopes
carbon dioxide
isotope mass balance
Opis:: Izotopy trwałe stanowią doskonałe narzędzie do analizy źródeł pochodzenia gazów cieplarnianych. Znając specyficzne sygnatury izotopowe poszczególnych źródeł dwutlenku węgla można określić pochodzenie CO2 nagromadzonego w miejskiej atmosferze. Kwasi-ciągłe pomiary stężenia i składu izotopowego węgla w atmosferycznym CO2 prowadzone w 2013 roku w Krakowie pozwoliły na dokonanie analizy ich zmienności sezonowej oraz synoptycznej. Źródłem obserwowanych zimą zwiększonych stężeń CO2 w atmosferze Krakowa było spalanie, w głównej mierze gazu ziemnego w celach grzewczych. Latem zaobserwowano wpływ suszy na stężenie CO2 w miejskiej atmosferze – z powodu obumierania lokalnej biosfery zmalała jej wydajność fotosyntetyczna, prowadząc do wyższych niż normalnie stężeń tego gazu w miesią - cach letnich. Przeprowadzono również dyskusję przyczyn krótkoterminowych wzrostów stężenia dwutlenku węgla, wykorzystując pomiary jego składu izotopowego oraz analizy trajektorii wstecznych mas powietrza. Zaprezentowane dwa przypadki ilustrują sytuacje, w których za chwilowy wzrost stężenia CO2 odpowiadają źródła przemysłowe oraz komunikacyjne.
Stable isotopes constitute a powerful tool to study the sources of greenhouse gases, especially CO2. Carbon dioxide derived from the burning of fossil fuels has a distinct 13C isotopic composition depending on the type of fuel. Therefore, one can attribute contributions of different emission sources to the total CO2 load in the urban atmosphere. Quasi-continuous measurements of the mixing ratio of atmospheric CO2 and its 13C signature were performed in Krakow in 2013 to analyze its seasonal and synoptic variability. High CO2 mixing ratios were observed in winter due to intensified burning of fossil fuels for heating purposes (mostly methane). During the summer of 2013, a slight increase in atmospheric CO2 was observed following a drought event and a subsequent suppression of the photosynthetic activity of the local biosphere. A high temporal resolution of the measurements allowed to analyze short-term increases of the measured CO2 mixing ratios. Two such events are presented and discussed. Isotopic mass balance combined with air backward trajectory analysis allowed to attribute local traffic and industry as potential sources of these events.
Źródło:: Acta Geographica Lodziensia; 2016, 104; 113-122
0065-1249
Pojawia się w:: Acta Geographica Lodziensia
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 13.

Tytuł:: Sedimentary history and biota of the Zechstein Limestone (Permian, Wuchiapingian) of the Jabłonna Reef in Western Poland
Autorzy:: Peryt, T. M.
Raczyński, P.
Peryt, D.
Chłódek, K.
Mikołajewski, K.
Powiązania:: https://bibliotekanauki.pl/articles/191254.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Wuchiapingian
reefs
Zechstein
bryozoans
stromatolites
aragonite cementation
neptunian dykes
carbon and oxygen isotopes
Opis:: The Jabłonna Reef, one of the reefs formed in Wuchiapingian time in the western part of the Wolsztyn palaeo-High (SW Poland), is characterized by quite irregular outlines and consists of three separate reef bodies (ca. 0.5–1.5 km² each; the thickness of the reef complex is usually >60 m). It is penetrated by four boreholes, which show two distinct phases of bryozoan reef development during deposition of the the Zechstein Limestone. The first one occurred early in the depositional history and botryoidal aragonitic cementation played a very important role in reef formation. This phase of bryozoan reef development terminated suddenly; one possible reason was that a relative change of sea level – first a fall and then a rise – disturbed the upwelling circulation. Consequently, bioclastic deposition predominated for a relatively long time until the second phase of bryozoan reef development occurred, but the latter was not accompanied by dubious early cementation. During this second phase, reticular fenestellid bryozoans were predominant. Subsequently, microbial reefs developed and abound in the upper part of the Zechstein Limestone sections. The general shallowing-upward nature of deposition in the Jab³onna Reef area resulted in reef-flat conditions with ubiquitous, microbial deposits, in the central part of the Jab³onna Reef. Then, the reef-flat started to prograde and eventually the entire Jab³onna Reef area became the site of very shallow, subaqueous deposition. Five biofacies are distinguished in the Jab³onna Reef sections: the Acanthocladia biofacies at the base, then mollusc-crinoid, brachiopod-bryozoan, Rectifenestella and at the top, stromatolite biofacies. They represent a shallowing-upward cycle, possibly with some important fluctuation recorded as the distinctive lithofacies boundary, corresponding to the Acanthocladia/mollusc-crinoid biofacies boundary. The 13C curves of the Jab³onna 2 and Jab³onna 4 boreholes permit correlation of the trends in the middle parts of both sections and confirm the strong diachroneity of the biofacies boundaries, with the exception of the roughly isochronous Acanthocladia/ mollusc-crinoid biofacies boundary. The presence of echinoderms and strophomenid brachiopods indicates that until deposition of the lower part of the Rectifenestella biofacies, conditions were clearly stenohaline. The subsequent elimination of stenohaline organisms and progressively poorer taxonomic differentiation of the faunal assemblage are characteristic for a slight, gradual rise in salinity. The taxonomic composition of organisms forming the Jab³onna Reef shows a similarity to reefs described from England and Germany, as well as the marginal carbonate platform of SW Poland. Filled fissures were recorded in the lower part of the Jabłonna Reef. The aragonite cementation recorded in some fissure fillings implies that they originated in rocks exposed on the sea floor and are neptunian dykes.
Źródło:: Annales Societatis Geologorum Poloniae; 2016, 86, 4; 379-413
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 14.

Tytuł:: Sedimentary development and isotope analysis of deposits at the Cretaceous/Palaeogene transition in the Paraíba Basin, NE Brazil
Autorzy:: Neumann, Virgínio Henrique
Barbosa, José Antônio
Nascimento-Silva, Valberlândia Maria
Sial, Alcides Nobrega
Filho, Mario
Powiązania:: https://bibliotekanauki.pl/articles/94597.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: NE Brazil
Cretaceous-Paleogene boundary
carbon isotopes
oxygen isotopes
Brazylia
izotop węgla
izotop tlenu
Opis:: New data are presented for three formations (Itamaracá, Gramame and Maria Farinha) and two boundaries (Campanian/Maastrichtian and Maastrichtian/Danian) in the Olinda Sub-basin of the Paraíba Basin. Currently accepted facies models, sequence stratigraphy characterizations, and stable-isotope data of carbon and oxygen are reviewed. The carbonate cement of the Itamaracá Formation sandstones shows carbon- and oxygen-isotope ratios consistent with a shallow-marine depositional environment: δ18O ranges from -0.8 to -2.7‰ PDB, and δ13C ranges from +1 to +2‰ PDB. Within the Itamaracá Formation, a maximum flooding surface at the Campanian/Maastrichtian transition has been identified. During the Maastrichtian, a Highstand System Tract was deposited, which shows an increase in temperature and marine bioproductivity as recorded by stable-isotope values (δ18O from -3 to -5‰ PDB, and δ13C values of -1.2, -0.3, 0.1 and +2.3‰ PDB). Just below the K/Pg boundary, the O-isotope signal indicates three warming phases, alternating with four cooling phases.
Źródło:: Geologos; 2009, 15, 2; 103-113
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 15.

Tytuł:: Seasonal and diurnal variations of δ13C and concentration of atmospheric CO2 at Parma, Italy
Autorzy:: Longinelli, A.
Selmo, E.
Powiązania:: https://bibliotekanauki.pl/articles/2058957.pdf
Data publikacji:: 2005
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: atmosphere
carbon dioxide
environment
anthropogenic emissions
carbon isotopes
Opis:: The δ13C of atmospheric CO2 from discrete air samples collected at the University campus, Parma, Italy, was measured at time intervals of about five days over a period of 18 months. Some day and night samples were measured along with three daily time series to evaluate the daily variations of δ13C values and CO2 concentrations. The following patterns were revealed: (1) the least negative δ13C values show a seasonal evolution with slightly more negativevalues during winter and less negative values during summer. Home heating systems probably contribute to this behaviour; (2) four samples collected in down town Parma show more negative values than those collected at the same time at the University campus, probably be cause of car engine pollution; (3) occasionally, quite negative δ13C values were obtained at the campus. The expansion of polluted air masses from down town to the suburban area may be responsible for these negative events; (4) one sample showed a δ13C of -17.67‰. The nearby fields had been extensively manured and the contribution from organic matter fermentation may explain the exceptionally negative result; (5) the diurnal changes in δ13C are relatively low from January to May; (6) in July and September the major daily changes take place in the late evening and in the early morning and are very fast. During the night the CO2 concentration in creases by no more than some 50-60%, this behaviour differing from observations by other authors in different areas; (7) the set of daily samples collected in August shows a different behaviour, clearly related to the heavy rain that lasted for several hours during the night.
Źródło:: Geological Quarterly; 2005, 49, 2; 127-134
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "carbon isotopes" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język