Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "weathering" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 101
Tytuł:
Planimetrowanie ziaren FeNi jako metoda ustalenia stopnia wietrzenia W0–W4 chondrytów zwyczajnych
FeNi grains planimetry as a method to establish weathering grade W0–W4 of ordinary chondrites
Autorzy:
Przylibski, Tadeusz A.
Łuszczek, Katarzyna
Blutstein, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/1033132.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
FeNi alloy weathering
Wlotzka scale
meteorite
ordinary chondrite
ordinary chondrite weathering
ordinary chondrites weathering scale
weathering grade
Opis:
Wlotzka scale (Wlotzka 1993) is commonly used to determine the weathering grade of ordinary chondrites. The scale is descriptive and based mostly on a subjective assessment of researcher. In this paper authors define a new, quantitative method to establish the W0–W4 weathering grade, which is based on planimetry of FeNi grains. Results of planimetry are compared with average content of FeNi metal in unweathered chondrites from the same group. Weathering grade estimated by this method are consistent with, or slightly different from the official one determined in classification, what proves the efficacy of the proposed method. Moreover, the method was applied to define weathering grade of meteoritic samples not classified so far: Pułtusk (W2), Thuathe (W2), Gao-Guenie (W2/W3), NWA 5205 (W3), NWA 4505 (W3), NWA 5296 (W2).
Źródło:
Acta Societatis Metheoriticae Polonorum; 2019, 10; 111-120
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the weathering parameters of bones to stratigraphical interpretation of the sediments from two caves (Deszczowa Cave and Nietoperzowa Cave, Kraków-Częstochowa Upland, Poland)
Autorzy:
Krajcarz, Maciej T.
Madeyska, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/2026726.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cave sediments
Palaeolithic
fossil bones weathering
rubble weathering
palaeoenvironment reconstruction
histological index
Opis:
Anal y sis of weath er ing pa ram e ters of bones from cave de pos its is pre sented as a use ful tool of palaeoenvironmental re con struc tion. As an ex am ple, we stud ied pro files of sed i ments in two Palaeo lithic sites: Nietoperzowa Cave and Deszczowa Cave. Our stud ies in cluded histological and EDS anal y ses of bone rem nants found in these pro files. This method al lowed us to re con struct the changes of palaeotemperature and palaeohumidity, and fi nally the climatostratigraphy of sed i ments. The re sults pre sented here put a new light onto the stra tig ra phy of Deszczowa Cave’s fill ing. In par tic u lar, be sides the Vistulian sed i ments (MIS 2–5d), we con firmed the pres ence of lay ers formed dur ing the Pen ul - ti mate Gla ci ation (MIS 6) and Eemian Inter gla cial (MIS 5e).
Źródło:
Studia Quaternaria; 2010, 27; 43-54
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavernous weathering forms in SW Iceland: a case study on weathering of basalts in a cold temperate maritime climate
Autorzy:
Zwalińska, Katarzyna
Dąbski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2035789.pdf
Data publikacji:
2012-11-10
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Tafoni
basalt weathering
Iceland
hydrogen
Opis:
The article is a case study of the development of cavernous weathering forms (alveoli and tafoni) on a sea cliff near Keflavik on the Reykjanes peninsula in southwestern Iceland. The majority of forms are found on vertical or inclined rock faces and cluster around the uppermost edge of the cliff. Single hollows gradually evolve due to back wearing of their sidewalls into complex caverns, until finally the whole outermost layer of basalt is removed. Particular attention is paid to mineralogical changes of basalts due to chemical and salt weathering. Chemical decomposition of feldspars, pyroxenes and olivines followed by precipitation of iron on and within the weathering rind, the presence of micro- and macro-pores such as gas bubbles and delivery of marine salts are proposed to be the key factors influencing cavern development.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2012, 16, 1; 11-16
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on pre-Eocene karst in the Tatra Mountains, Central Carpathians, Poland
Autorzy:
Gradziński, M.
Jach, R.
Hercman, H.
Powiązania:
https://bibliotekanauki.pl/articles/2059838.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
cave deposits
speleothems
weathering
Palaeogene
Opis:
Sparry limestone, ferruginous muddy limestone and limestone breccia have been found in the Western Tatra Mts. They occur within Jurassic rocks of the Choč Nappe just below red conglomerates of probable Eocene age. The deposits found bear strong resemblance to the infill of subterranean karst forms. They differ significantly from Quaternary karst deposits of the Tatra Mts. The δ18O values of spelean carbonates suggest crystallisation at relatively high temperatures (over 20°C) whereas their relatively negative δ13C values imply the presence of soil-derived CO2 linked with vegetation dominated by C3 pathway plants. The karst forms and their infill were formed before the Eocene transgression, which shows unequivocally that the Tatra Mts. were subjected to karstification at that time.
Źródło:
Geological Quarterly; 2016, 60, 2; 291-300
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micromorphology of cryoconite on Garabashi and Skhelda glaciers and soils of Baksan Gorge, Mt. Elbrus, Central Caucasus
Autorzy:
Abakumov, Evgeny
Tembotov, Rustam
Kushnov, Ivan
Polyakov, Vyacheslav
Powiązania:
https://bibliotekanauki.pl/articles/16538453.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Russia
Caucasus
sediments
weathering
deglaciation
Opis:
In the Central Caucasus region, the intense process of deglaciation is identified as caused by cryoconite formation and accumulation. The fine earth materials were collected on the surfaces of Skhelda and Garabashi glaciers as well as from zonal soils of Baksan Gorge and were studied in terms of chemical, particle-size, and micromorpholo-gical features. Supraglacial sediments are located at the glacial drift area of material and, thus, due to transfer of these sediments to the foothill area, their fine earth material can affect micromorphological and chemical characteristics of adjacent zonal soils. Thin sections of mineral and organo-mineral micromonoliths were analyzed by classic micromorphological methods. Data obtained showed that the weathering rates of cryoconite and soil minerals are different. The cryoconite material on the debris-covered Skhelda Glacier originated from local massive crystalline rocks and moraines, while for Garabashi Glacier the volcanic origin of cryoconite is more typical. Soils of Baksan Gorge are characterized by more developed microfabric and porous media, but their mineralogical composition is essentially inherited from sediments of glacial and periglacial soils. These new data could be useful for understanding the process of evolution of the mineral matrix of cryoconite to the soil matrix formed at the foot of the mountain.
Źródło:
Polish Polar Research; 2022, 43, 1; 1-20
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogia hałd wietrzeniowych złoża Miedzianka (Góry Świętokrzyskie)
Mineralogy of weathering heaps in the Miedzianka deposits (Holy Cross Mountains)
Autorzy:
Swęd, M.
Urbanek, P.
Krechowicz, I.
Dworczak, P.
Wiecka, P.
Mleczak, M.
Tobys, P.
Powiązania:
https://bibliotekanauki.pl/articles/2075336.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
minerały
wietrzenie
Miedzianka
minerals
weathering
Opis:
The paper presents new data on the weathering zone in Miedzianka, Holy Cross Mountains (Poland), including macroscopic, microscopic and chemical investigation, using scanning electron microscope (SEM) with energy dispersive spectrum (EDS). The deposit contains sulphide mineralization (e.g. chalcopiryte, chalcocite), and carbonates with hydroxyl (malachite and azurite) in the weathering zone. Additionally, arsenic – bearing sulphosalts of the tennantite – tetrahedrite group and Ba-sulphate were found. Moreover, cracks are observed on a macro- and micro-scale, filled with new minerals that formed during the weathering.
Źródło:
Przegląd Geologiczny; 2015, 63, 6; 363--370
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Saléeite, Mg(UO2)2(PO4)2, from the Wojcieszyce uranium deposit (Lower Silesia, Poland)
Autorzy:
Siuda, R.
Domańska-Siuda, J.
Borzęcki, R.
Powiązania:
https://bibliotekanauki.pl/articles/191246.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Saléeite
weathering of uraninite
Wojcieszyce
Opis:
The secondary uranium mineral, saléeite, was found in dumps of the former Wojcieszyce Uranium Mine. It occurs as tiny tabular crystals, up to 0.3 cm in size. The chemical formula, which was calculated on the basis of a 12 spot analyses is: (Mg0.73Fe0.05K0.04Ca0.04)S0.86(UO2)2.16(PO4)2.00·10H2O. The cation position is occupied mainly by Mg. The Mg ions are partially substituted by Fe, K and Ca. The tetrahedral position is occupied by the PO43- ion. The interaction between acidic pore solutions (originating from the reaction of pyrite oxidation), uraninite and minerals of the host rocks (chlorite, apatite) leads to the release of Mg2+, UO22+ and PO43- ions. These ions are adsorbed by amorphous Fe oxyhydroxides and poorly ordered ferrihydrite. Crystallization and recrystallization of these phases leads to the release of adsorbed ions and favours the crystallization of saléeite. The coexistence of saléeite and goethite, which forms by recrystallization of ferrihydrite, points to an important role of sorption and desorption of Mg2+, PO43- and UO22+ ions in the process of crystallization of this mineral species. Crystallization of saléeite occurs at a pH of 5.5–6.0. The supergene zone of the Wojcieszyce deposit is the first occurrence of saléeite in Poland.
Źródło:
Annales Societatis Geologorum Poloniae; 2016, 86, 2; 211-218
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność wskaźników wietrzenia współczesnych osadów Odry i jej dopływów
Weathering indices variability of contemporary Odra sediments and its tributaries
Autorzy:
Bojakowska, I.
Nadłonek, W.
Powiązania:
https://bibliotekanauki.pl/articles/112933.pdf
Data publikacji:
2016
Wydawca:
STE GROUP
Tematy:
wskaźniki wietrzenia chemicznego
zlewnia Odry
wietrzenie chemiczne
chemical weathering indices
Odra drainage basin
chemical weathering
Opis:
Wskaźniki wietrzenia chemicznego są powszechnie stosowane do charakterystyki profili wietrzeniowych i określania stopnia procesu wietrzenia. Ich wartości pozwalają na wskazanie składu niezwietrzałej skały macierzystej. Wykorzystując wyniki badań osadów zlewni Odry i Warty przeprowadzono próbę określenia zmienności wskaźników wietrzenia na tym obszarze kraju. Wśród stosowanych wskaźników największą rolę mają wietrzeniowy wskaźnik Parkera (WIP) i chemiczny wskaźnik przemian (CIA), zatem im poświęcono najwięcej uwagi. W celu lepszego odzwierciedlenia intensywności wietrzenia stosowano dodatkowe wskaźniki, wrażliwe na najmniejsze zmiany geochemiczne. Obliczano wskaźnik Vogt’a (V), wskaźnik wietrzenia chemicznego Harnois’a (CIW) i wskaźnik przemian plagioklazów (PIA). Wyniki badań pozwoliły na ocenę intensywności wietrzenia na całym obszarze badawczym, a także na wskazanie czynników odpowiadających za jego przebieg. Na wartość wskaźników wietrzenia wpływają: litologia, klimat, wielkość spływu powierzchniowego i morfologia terenu.
Chemical weathering indices are commonly used for characterizing weathering profiles and evaluating degree of weathering process. Their values allow to point at nonweathered source rock composition. Using study results of Odra and Warta drainage basin sediments, there was made a try to define variability of chemical indices in this country area. Among applied indices the most important role have Weathering Index of Parker (WIP) and Chemical Index of Alteration (CIA), thus them was given the most attention to. In order to better reflecting the intensity of weathering there were used additional indices, sensitive to the slightest geochemical changes. Vogt’s Residual Index (V), Chemical Index of Weathering (CIW) and Plagioclase Index of Alteration (PIA) were calculated. Study results let to evaluation the weathering intensity in the all study area and to indicate factors, which are in charge of this process. Lithology, climate, flow magnitude and region morphology have an influence on the values of weathering indices.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2016, 5 (17); 48-60
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport conditions of mountain-surging glaciers as recorded in the micromorphology of quartz grains (Medvezhiy Glacier, West Pamir)
Autorzy:
Muzińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/94604.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
glacier surge
SEM
abrasion
crushing
chemical weathering
frost weathering
szarża lodowcowa
abrazja
kruszenie
wietrzenie chemiczne
Opis:
In order to reproduce the conditions under which sediments were transported in surging glaciers, samples were taken from the margin and foreland of the surge Medvezhiy Glacier situated in West Pamir (Tajikistan). They were subjected to an analysis of rounding and frosting of quartz sand grains (0.8–1.0 mm) and of grain surface micromorphology under scanning electron microscope (SEM). Results obtained showed intense chemical weathering occurred in the majority of quartz grain surfaces, marked in the form of etching and precipitation. Frequencies of microstructures of glacial origin were low; individual microstructures were visible on single grains. A predominance of the crushing process over abrasion in transformation of quartz grains was noted. The commonest microstructures connected with a surge-glacier environment were large and small conchoidal fractures. However, grains with primary features not connected with a glacial environment were equally common. The majority of the grains examined showed features of multiple cycles of mechanical and chemical weathering forming a microtexture under various conditions (overprinting). Common features of grains from surging glaciers are also breakage blocks of >10μm, which depend of the phase of separation of the grain from the rock or on thermal changes in the glacier’s foreland.
Źródło:
Geologos; 2015, 21, 2; 127-138
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
True and fake red layers on the objects from archaeological and historical context: microscopic observations
Autorzy:
Trąbska, J.
Trybalska, B.
Powiązania:
https://bibliotekanauki.pl/articles/184267.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
archaeology
red layer
painting
weathering crust
Opis:
Colored layers on surfaces of objects associated with archaeological and historical context may be of various origins: natural or intentional and in numerous cases their exact identification is not obvious, especially for thousand-year-old objects. Yet, the diagnosing of their nature may constitute an important element for the interpretation of ancient cultures. Examples of red color layers of natural, intentional and unclear origin were chosen and observed to select criteria defining layers of uncertain parentage.
Źródło:
Geology, Geophysics and Environment; 2014, 40, 2; 241-254
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical weathering on the glacial foreland of Storbreen, Jotunheimen Mountains, Norway
Autorzy:
Thorn, C. E.
Darmody, R. G.
Allen, C. E.
Campbell, S. W.
Powiązania:
https://bibliotekanauki.pl/articles/294490.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
chemical weathering
Storbreen
Jotunheimen Mountains
Norway
Źródło:
Landform Analysis; 2007, 5; 87-88
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of sodium ascorbate on weathering performance of NaOH pulping and paper
Autorzy:
Gencer, A.
Onat, S.M.
Can, A.
Ozgul, U.
Sivrikaya, H.
Yurdakurban, F.
Powiązania:
https://bibliotekanauki.pl/articles/52409.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
sodium ascorbate
weathering
performance
pulping
paper
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 198
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface mineralization on Seymour Island, Antarctica
Autorzy:
Tatur, Andrzej
Barczuk, Andrzej
del Valle, Rodolfo
Sletten, Ronald
Kicińska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/2052735.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
Seymour (Marambio) Island
weathering
mineralogy
microbiology
Źródło:
Polish Polar Research; 1993, 14, 2; 153-168
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Age and weathering status of granite tors in arctic Finland
Autorzy:
Darmody, R. G.
Seppälä, M.
Thorn, C. E.
Li, Y. K.
Campbell, S. W.
Harbor, J.
Powiązania:
https://bibliotekanauki.pl/articles/294729.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
age and weathering status
granite tors
Finland
Źródło:
Landform Analysis; 2007, 5; 16-17
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The geochemical composition of sediment as a proxy of provenance and weathering intensity: a case study of Southwest Nigeria’s Coastal Creeks
Autorzy:
Phillips, O. A.
Falana, A. O.
Adebayo, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/184285.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Badagry Creek
Yewa Creek
elemental ratios
provenance
weathering
Opis:
The study of the geochemical composition of sediments was undertaken to evaluate the degree of weathering and appraise the relative proportion of mafic and felsic rock materials being transported from source to sink. Thirty-three surface sediment samples collected from the creeks were used for particle size and chemical analyses. An inductively coupled plasma-Mass Spectrometer was used to determine the elemental composition of the sediments. The clay dominated Yewa and western Badagry creeks gave evidence of higher average concentrations of Ni, Sr, Y, Nb, Sc, Co, V, and Th than the eastern end of segment of Badagry Creek. The data generated from elemental ratios such as Al 2 O 3 /TiO 2, TiO 2 /Zr and binary plots of Th/Sc-Cr/Sc, Th-Sc, Y/Ni-Cr/V, TiO 2 -Zr and ICV-CIA (index of compositional variability against chemical index of alteration) showed that source sediments are composed of upper and lower crustal compositions. Also, the creeks were marked by their variation in terms of the proportion of felsic and mafic components. For instance, Yewa and western Badagry creeks are more enriched in mafic constituents, whereas the enrichment of felsic materials is significant at the eastern end of Badagry Creek. Inferring from the chemical index of alteration and plagioclase index of alteration (PIA), the Yewa and western Badagry creeks have been moderately to intensely weathered and incipient weathering was identified in the eastern end of Badagry Creek.
Źródło:
Geology, Geophysics and Environment; 2017, 43, 3; 229-248
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 101

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies