Počet záznamů: 1
Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives
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SYSNO ASEP 0531007 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives Tvůrce(i) Matys Grygar, Tomáš (UACH-T) RID, SAI, ORCID
Mach, K. (CZ)
Hron, K. (CZ)
Fačevicová, K. (CZ)
Martinez, M. (FR)
Zeeden, C. (DE)
Schnabl, Petr (GLU-S) RID, SAI, ORCIDCelkový počet autorů 7 Číslo článku 105717 Zdroj.dok. Sedimentary geology. - : Elsevier - ISSN 0037-0738
Roč. 406, AUG (2020)Poč.str. 12 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Cyclostratigraphy ; Geochemistry ; Log-ratio methodology ; Robust statistics ; Stratigraphy ; Weathering proxies Vědní obor RIV DD - Geochemie Obor OECD Environmental sciences (social aspects to be 5.7) Vědní obor RIV – spolupráce Geologický ústav - Geologie a mineralogie CEP GA19-01768S GA ČR - Grantová agentura ČR GA16-00800S GA ČR - Grantová agentura ČR Způsob publikování Open access s časovým embargem (01.08.2022) Institucionální podpora UACH-T - RVO:61388980 ; GLU-S - RVO:67985831 UT WOS 000568162600005 EID SCOPUS 85087396846 DOI https://doi.org/10.1016/j.sedgeo.2020.105717 Anotace The extraction of palaeoenvironmental (palaeoclimatic) signals from the chemical composition of siliciclastic sediments is valuable for the reconstruction of past environments, particularly in continental basins. Here we test novel weathering proxies, which are less sensitive to lithological control than the previously used raw element ratios K/Al, K/Ti, and K/Rb: (1) local enrichment factors of K/Al, Mg/Al, and K/Rb, i.e., the element ratios corrected for grain size- and matrix composition using local background functions (Al/Si, Fe, and Ca as explanatory variables) and ordinary regression and (2) robust regression residuals of those element ratios based on isometric log-ratio coordinates of the most relevant “lithogenic” elements (Ca, Fe, Rb, Si, Zr) in the chemical composition. Chemical weathering proxies can be obtained from departures of chemical composition of sedimentary profiles from relationships with other chemical elements, in particular those with grain-size control. The resulting weathering proxies were examined for the Miocene deposits from the Most Basin, the Czech Republic, which recorded one of the major warm episodes of the Cenozoic time – the Miocene Climatic Optimum. The performance of weathering proxies has been checked by (1) comparison of individual proposed proxies in one drill core HK930, (2) detailed analysis of orbital signals in the relevant compositional functions in HK930, and (3) lateral correlation of three cores HK930, DU7, and DO565 of the same basin. The novel proxies show lateral stability and orbital signatures of short eccentricity, obliquity, and precession, confirming their usefulness in palaeoenvironmental studies. Corrections for grain-size and carbonate contents should help to isolate climatic content from the weathering proxies, although in the studied sediments it weakened the precession component in the orbital signal, as grain-size proxies and other compositional data also carried orbital signals. We propose to consider these proxy ideas in palaeoclimatic reconstructions based on chemical weathering proxies. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2021 Elektronická adresa http://hdl.handle.net/11104/0309774
Počet záznamů: 1