Počet záznamů: 1
Chemical weathering in Antarctica: an example of igneous rock particles in Big Lachman Lake sediments, James Ross Island
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SYSNO ASEP 0525326 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Chemical weathering in Antarctica: an example of igneous rock particles in Big Lachman Lake sediments, James Ross Island Tvůrce(i) Vašinka, M. (CZ)
Krmíček, Lukáš (GLU-S) RID, ORCID, SAI
Všianský, D. (CZ)
Hrbáček, F. (CZ)
Nývlt, D. (CZ)Číslo článku 186 Zdroj.dok. Environmental Earth Sciences. - : Springer - ISSN 1866-6280
Roč. 79, April (2020)Poč.str. 18 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova Lake sediments ; Trace elements ; Clay minerals ; Weathering Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology Způsob publikování Omezený přístup Institucionální podpora GLU-S - RVO:67985831 UT WOS 000527677100002 EID SCOPUS 85083288064 DOI 10.1007/s12665-020-08926-3 Anotace Lacustrine sediments of the Big Lachman Lake (James Ross Island, Antarctica) are dominated by clay- and silt-sized particles of varied petrographic composition. These are of volcanic origin and are derived predominantly from the Mendel Formation. The intensity of chemical weathering of volcanic rock particles in the sediments was expressed by the Chemical Index of Alteration (CIA), which reflects alteration of feldspars and formation of clay minerals. The observed mineral assemblage of montmorillonite, illite, and kaolinite probably originated from alteration of volcanic glass and from alteration of feldspars to clay minerals. CIA weathering rates from the lacustrine sediments are similar to those of Early Jurrasic high-Ti volcanic rocks of the Mount Poster Formation and Middle Jurrasic high-Ti volcanic rocks of the Mapple Formation from the Antarctic Peninsula. However, the sediments show a good fit in OIB-normalized incompatible trace-element patterns only with the high-Ti volcanic rocks from the Middle Jurassic rhyolites of the Mapple Formation, while the fit with Cenozoic basalts of the James Ross Island Volcanic Group is poorer. Rocks from the Antarctic Peninsula were probably transported through the Prince Gustav channel by small glaciers during the Neogene and Quaternary. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2021 Elektronická adresa https://link.springer.com/article/10.1007/s12665-020-08926-3
Počet záznamů: 1