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Tytuł:
Respiration and assimilation processes reflected in the carbon isotopic composition of atmospheric carbon dioxide
Autorzy:
Szaran, J.
Niezgoda, H.
Trembaczowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/146953.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
atmosphere
carbon dioxide
carbon isotopes
delta-C-13
respiration
Opis:
This paper presents diurnal variations of concentration and carbon isotopic composition of atmospheric carbon dioxide caused by respiration and assimilation processes. Air samples were collected during early and late summer in 1998 in unpolluted area (village Guciow located near the Roztocze National Park, SE Poland) in three different environments: uncultivated field on a hill, a meadow in the Wieprz river valley and a forest. The effect is very strong during intensive vegetation growth on a sunny day and clear night. The largest diurnal variations in atmospheric CO2 concentration and its carbon isotopic composition in June above the meadow were about 480 ppm and 10‰, respectively.
Źródło:
Nukleonika; 2002, 47,suppl.1; 59-61
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon and oxygen isotopic survey of diagenetic carbonate deposits in the Agardhfjellet Formation (Upper Jurassic), Spitsbergen: preliminary results
Autorzy:
Krajewski, Krzysztof P.
Powiązania:
https://bibliotekanauki.pl/articles/2052060.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
Agardhfjellet Formation (Jurassic)
diagenetic carbonate deposits
carbon and oxygen isotopes
Źródło:
Polish Polar Research; 2004, 25, 1; 27-44
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of temperature carbon isotopic effect (Peat Bogs Hala Izerska, Izerskie Mts. and Szrenica, Karkonosze Mts.)
Autorzy:
Skrzypek, G.
Jędrysek, M. O.
Keller-Sikora, A.
Powiązania:
https://bibliotekanauki.pl/articles/1186009.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
izotopy trwałe
węgiel
temperatura
profil torfowy
stable isotopes
carbon
temperature
peat core
Opis:
Dwa rdzenie torfowe pochodzące z Karkonoszy i Gór Izerskich zostały przeanalizowane pod kątem zależności składu izotopowego węgla i temperatury powietrza okresu wegetacji w miejscu poboru. Ciągłe rdzenie torfowe o długości całkowitej 160 i 195 cm, obejmujące ostanie 4500 lat, podzielono na próbki o miąższości 4-6 cm. Uzyskane wartości ?13C zawierają się w przedziale od -26,85 do -21,8‰. Próbki z poszczególnych części rdzeni zostały skorelowane wiekowo na podstawie datowań radiowęglowych (14C). Temperatura powietrza była monitorowana za pomocą automatycznych rejestratorów HOBO Oneset podczas sezonu wegetacyjnego 2004. Na podstawie analizy temperatur stwierdzono, że sezon wegetacyjny w Karkonoszach (punkt na wysokości 1240 m n.p.m.) trwa od 29 kwietnia do 7 października przy średniej temperaturze powietrza 9,2 stopni C, natomiast na Hali Izerskiej od 27 kwietnia do 7 października przy średniej temperaturze 10,4 stopni C (wysokość 857 m n.p.m., las) i 11,5stopni C (843 m n.p.m., otwarta przestrzeń, hala). Wzrost temperatury powietrza sezonu wegetacyjnego o 1stopień C powoduje zmianę wartości ?13C materii organicznej roślin torfotwórczych o -0,83‰
Źródło:
Polish Geological Institute Special Papers; 2005, 16; 123-126
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depth of the water column in relation to carbon isotope ratios in methane in fresh water sediments
Autorzy:
Jędrysek, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/2058951.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stable carbon isotopes
methane
fresh water sediments
diagenesis
environmental record
Opis:
Methane was collected from the surficial sedimentary layer (0 to about 20 cm) in 45 fresh water lakes in Poland. Sampling was also carried out at various depths of the over lying water column (0.15 to 12 m) between noon and early after noon, on a seasonal basis, between 1992 and 1996. A positive correlation between the depth of the lake water, the δ13 C (CH4) value (from ca. -l.4 to -2.3% per l m depth) and the wider δ13 C (CH4) variation over the thermocline are probably due to: the time of sinking of organic particles resulting in more in tense acetate fermentation in shallower portions of the lake; the temperature variation; differences in the precursors of methane, the diffusion effect, and an increase of bioavailable DIC (dissolved inorganic carbon) at greater depths. Non-seasonal variation of isotope ratios in methane and the depth-isotope ratio correlation show that the lake system is in dynamic equilibrium on a scale of hours and days. Therefore, earlier models of methanogenesis relating and the atmospheric methane isotopic budget, proposed by other authors and based on sampling of methane from sediments, need to be revised. More over, δ13 C (CH4) values higher during seasonal over turn (mixing of benthic and surface waters) than during stagnation, have been observed. This is probably due to the fact that during over turn periods some organic compounds (methane precursors) and methane in the surficial part of sediments, are oxidized with a resalting kinetic isotope effect. It is proposed that oxidation of methane and other organic compounds during seasonal over turn may be responsible for post-depositional lamination observed as pale (autumn over turn) and dark (summer organic-rich unoxic stagnation) millimetres-thick layers in fresh water lake sediments.
Źródło:
Geological Quarterly; 2005, 49, 2; 151-164
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
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
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
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
Tytuł:
Metodyka analiz izotopowych rozpuszczonego węgla nieorganicznego (DIC) i ich zastosowania w badaniach hydrogeologicznych i środowiskowych
Methodology and application of stable isotope analysis of dissolved inorganic carbon (DIC) in hydrogeology and environmental studies
Autorzy:
Szynkiewicz, A.
Drzewicki, W.
Jędrysek, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/2074490.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
rozpuszczony węgiel nieorganiczny (DIC)
izotop węgla
dissolved inorganic carbon
carbon isotopes
Opis:
The analysis of carbon isotope composition of dissolved inorganic carbon (DIC) is widely applied in hydrogeology and environmental studies. The method of analysis is simple and based on conversion of all DIC species to gaseus CO2 under acidic conditions. However, the analytical procedure may involve significant carbon isotope fractionation. Our experimental analysis showed that increasing the time of CO2 extraction influences the increase of ä13C(DIC) value as a result of re-dissolution of CO2 in the water expanded on the vacuum line or/and carbon isotope exchange between the extracted CO2 and the atmospheric CO2. The long time of sample storage yields an increase of ä13C(DIC) value and decrease of DIC concentration. The analytical precision up to š 0,1‰ may be achieved in the case of waters being analyzed few days after sampling. DIC concentration was evaluated according to height of peak 44 in the mass spectrum. The analytical precision of this method was š 2 mgCO2 per dm3. This method is very useful because the measurements of the height of peak 44 and carbon isotope composition of DIC can be performed simultaneously. However, this method is reliable for waters containing more than 4 mg CO2 per dm3
Źródło:
Przegląd Geologiczny; 2006, 54, 9; 797-806
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of postglacial paleoproductivity in Long Lake, King George Island, West Antarctica
Autorzy:
Yoon, Ho-Il
Khim, Boo-Keun
Lee, Kyung
Park, Yu-Hyeon
Yoo, Kyu-Cheul
Powiązania:
https://bibliotekanauki.pl/articles/2051902.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
lake sediment
paleoclimate
diatoms
organic carbon
carbon isotopes
Źródło:
Polish Polar Research; 2006, 27, 3; 189-206
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Origin of siderites from the Lower Jurassic Ciechocinek Formation from SW Poland
Autorzy:
Leonowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059485.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Cracow-Silesian Upland
Lower Jurassic
siderites
geochemistry
carbon isotopes
oxygen isotopes
palaeosalinity
Opis:
Sideritic rocks, which are characteristic constituents of muddy-silty deposits of the Lower Jurassic Ciechocinek Formation, occur commonly as layers, lenses and small irregular concretions composed of siderite mudstone and siltstone as well as less common lenses of sideritic sandstones. Three types of siderite cement were observed in thin sections: fine-crystalline variety (SF), coarse-crystalline rhombohedra (SR) and fine-crystalline biogenic aggre gates (SA). In all these types BSE analysis revealed compositional zonation of crystals, with in ternal parts enriched in Mg, Mn and Ca and outer zones almost pure siderite. d13C values and chemical composition of siderites combined with the presence of early diagenetic pyrite indicate that siderite crystallized from brackish marine-derived solutions; only in the case of two samples from the lower part of the Ciechocinek Formation the fresh water origin cannotbe excluded. Mn and Fe were supplied by rivers and released by Fe- and Mn-reduction in suboxic zone, whereas Mg and Ca were derived from sea water, which infiltrated into the sediment. Crystal zonation resulted from the diagenetic evolution of pore water as the sediment was buried. Similar composition and development of siderite crystals from different parts of one layer indicate that siderite precipitated simultaneously throughout the whole horizon. Precipitation began from the formation of numerous nuclei and continued by growth of crystals onto them. It could begin already in the iron reduction subzone and continued in the sulphate reduction and methanogenesis zones.
Źródło:
Geological Quarterly; 2007, 51, 1; 67-78
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ageing of organic matter in incubated freshwater sediments; in fer ences from C and H isotope ratios of methane
Autorzy:
Szynkiewicz, A.
Modelska, A.
Jedrysek, M-O.
Kurasiewicz, M.
Mastalerz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059090.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
methanogenic pathways
carbon and hydrogen isotopes
incubation
freshwater sediments
Opis:
The freshwater sediments were incubated under anaerobic conditions for 570 and 879 days to in vestigate the potential variations in methanogenic pathways due to increasing sediment age and recalcitrance of organic matter. The methanogenic pathways did not shift from acetate fermentation toward CO2 reduction, as indicated by the observed variations of the isotopic composition of methane in natural conditions. It appeared, however, that the observed decrease of methane concentration (from 86 to 39%) and continuous in crease in d13C(CH4) (from –69.7 to –59.0‰) and dD(CH4) values (from –381 to –320‰) resulted mainly from exhaustion of at least one methanogenic substratein the incubated sediments. To better understand processes controlling the variations of delta exp.13C(CH4) and deltaD(CH4) values relative to ageing of organic matter, the method of principal component analysis (PCA) was used. This method offers good comparison of the relation ships between variables when a larger number of parameters control a given process in the same time period. In this study, the PCA indicated three distinctive factors that controlled decomposition of organic matter during the incubation. Factor 1 explained 33% of observed variations among the variables and had positive (0.93–0.92) loadings for electric conductivity and DIC concentration and negative loading for delta exp.13C(CH4) val ues (–0.72). Factor 2 accounted for 28% and had high posi ive loading for deltaD(CH4) value (0.86) and high negative loading for methane concentration (–0.81). Factor 3 accounted for 19% and exhibited high positive loadings for temperature (0.90) and delta exp.13C(DIC) value (0.69). Factors 1 and 2 were directly linked to the methanogenesis and indicated that bigger accumulation of bio-products in sediments is likely important for variations of delta exp.3C and deltaD of methane. This study shows that method of principal component analysis might be a useful tool while studying biogeochemical carboncy cleduring early digenesis of freshwater sediments.
Źródło:
Geological Quarterly; 2008, 52, 4; 383-383
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Delta13C of organic atmospheric dust deposited in Wrocław (SW Poland): critical remarks on the passive method
Autorzy:
Górka, M.
Jędrysek, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/2060221.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
solid organic atmospheric particles
carbon isotopes
Opis:
This paper reports the results of the application of passive collectors to the collection of solid organic atmospheric particles (SOAP) in Wrocław (SW Poland) to carry out stable carbon isotope analyses. delta exp.13C (SOAP) values collected during the vegetation-free period, from November to March, vary in a narrow range from -24.5 to -27.8‰. We show that d13C (SOAP) is able to provide information about atmospheric pollution with respect to different emission sources. delta exp.13C (SOAP) values collected during the period of vegetation growth, from April to October, show a wide range from -20.5 to -26.9‰. The most probable explanations for the 13C- enriched values in summer are that: (i) the SOAP have been contaminated with fresh and decomposed organic matter in the passive collector and/or (ii) SOAP are derived from out side the city or from out side Poland (C4 plant particles). There fore, the d13C (SOAP) may not represent a strictly anthropogenic im pact. The passive collector method for the (SOAP) collection should be applied only in areas with dry deposition of atmospheric dust where deposited organic matter is not de composed in the water contained in collectors. We recommend the use of active sampling methods (hi-volume sampler) to collect SOAP use ful for carbon isotope analyses.
Źródło:
Geological Quarterly; 2008, 52, 2; 115-115
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inkluzje fluidalne w halicie oraz bituminy w solach ewaporatów mioceńskich ukraińskiego Przedkarpacia jako wskaźnik występowania nagromadzeń węglowodorów w niżej leżących utworach
Fluid inclusions in halite and bitumens in rock salt from Miocene evaporites in the Ukrainian Fore-Carpathian region: as indicators of hydrocarbon accumulations in the underlying strata
Autorzy:
Więcław, D.
Lytvyniuk, S. F.
Kovalevych, V. M.
Peryt, T.M.
Powiązania:
https://bibliotekanauki.pl/articles/2074593.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
inkluzje fluidalne
bituminy
trwałe izotopy węgla
miocen
zapadlisko przedkarpackie
ewaporaty
fluid inclusions
bitumens
stable carbon isotopes
biomarkers
Miocene
Carpathian Foredeep
evaporites
Opis:
Fluid inclusions in halite from Miocene rock salt of the Ukrainian Carpathian Foredeep Basin in locations where evaporites overlie oil and gas reservoir rocks are characterized by their high methane content and the presence of oil droplets in some of them. They are thus similar to fluid inclusions reported from geochemical aureoles around oil and gas accumulations in the Zechstein (Upper Permian) of western Poland (Kovalevych et al., 2008). Geochemical analyses of bitumen in bulk samples of rock salt (including content and distribution of n-alkanes and isoprenoids, carbon isotope ratios) suggest a varied origin: hydrocarbon extracted from halite from boreholes located in proximity (proved or assumed) of oil and gas deposits (Lopushna-7, Grynivka-525) are probably related to organic material dispersed within the rock salt itself, and those from the barren areas (Verkhniy Strutyn-29) are most probably cogenetic with oil accumulated in the deposits of the Boryslav-Pokuttya Nappe.
Źródło:
Przegląd Geologiczny; 2008, 56, 9; 837-841
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
Biological markers and stable carbon isotope studies of bitumen impregnating Quaternary sediments at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
Autorzy:
Kotarba, M. J.
Fabiańska, M.
Więcław, D.
Kowalski, A.
Zych, H.
Powiązania:
https://bibliotekanauki.pl/articles/191516.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
biomarkers
stable carbon isotopes
bitumen content
oil origin
woolly rhinoceros
Starunia palaeontological site
Carpathian region
Ukraine
Opis:
Biological markers and stable carbon isotopic compositions of bitumen impregnating the Pleistocene and Holocene sediments around the Starunia palaeontological site (Carpathian region, Ukraine) near discovered remnants of a mammoth and three woolly rhinoceroses, and one almost completely preserved rhinoceros carcass found in 1907 and 1929, were investigated. The research was carried out to assess genetic connections between the bitumen and oils from the nearby deep accumulations of the Boryslav-Pokuttya and Skyba units of the Carpathians. Another aim of these geochemical studies was to reveal the secondary geochemical processes (oxidation and biodegradation) influencing the bitumen, and to determine which environments have been favourable or unfavourable for the preservation of large Pleistocene vertebrates. Bitumen included within the near-surface rocks are not genetically connected with residual organic matter present in Quaternary sediments. Geochemical features, such as distributions of pentacyclic triterpanes and steranes, biomarker parameters and isotope composition indicate that all bitumens originate from oil-prone, Type II kerogen with insignificant admixture of terrestrial Type III kerogen in the middle stage of catagenesis. The oils occurring in deep accumulations in the Starunia area were the sole source of bitumen found in the near-surface sediments. Input of immature organic matter to bitumen from Pleistocene and Holocene sediments has not been found. The main factors differentiating the bitumen were: biodegradation, water washing and/or weathering. Additional influence of transport of bitumen by brine was found. The most favourable conditions for preservation of large, extinct mammals within the Pleistocene muds exist in the vicinity of Nos 22 and 23 boreholes, where bitumen is best preserved. The worst conditions were found in the vicinity of Nos 1, 4, 4' and 15 boreholes. Intensification of biodegradation and weathering effects were followed by intensive, chaotic changes of the remnants of large Pleistocene mammals.
Źródło:
Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 463-480
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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