Abstract
Research subject . In this paper, we consider specific features of the use of litho- and isotopic-geochemical data for the purposes of provenance reconstruction. Methods and materials . The reconstruction tools under consideration included the analysis of the ratio of major oxides and variable trace elements, as well as the study of the distribution of trace elements. The research potential of these methods was illustrated using the data on the bulk chemical composition of sandstones and mudstones from the Bir’yan Member of the Upper Riphean Zilmerdak Formation, Upper Vendian Basa Formation (Southern Urals), Upper Devonian Kodinka and Ust’kodinka formations (Middle Urals), Lower Cretaceous Sortym Formation (Western Siberian sedimentary megabasin, Bolshekhetskaya depression). Results. It was shown that the use of the vast majority of the described paired and triangular diagrams allows conclusions (consistent both with each other and conventional geological concepts) to be drawn about the composition of source rocks. These findings reinforce the insights gained from mineralogical and petrographic studies of sandstones.
Highlights
The reconstruction tools under consideration included the analysis of the ratio of major oxides and variable trace elements, as well as the study of the distribution of trace elements
The research potential of these methods was illustrated using the data on the bulk chemical composition of sandstones and mudstones from the Bir’yan Member of the Upper Riphean Zilmerdak Formation, Upper Vendian Basa
(1990) Geochemical and Nd-Sr isotopic composition of deep-sea turbidites: crustal evolution and plate tectonic associations
Summary
2.43 1.03 1.71 0.59 0.04 0.48 1.17 9.27 4.43 1.75 4.21 3.61 1.50 0.18 2.64 0.27 0.83 2.18 2.00 5.15 4.12 1.60 0.13 1.88 0.29 2.00 3.75 для раннепротерозойской, соответственно, – 11.50, 1.78 и 0.72. 6. Диаграмма Cr/Th–Th/Sc (Condie, Wronkiewicz, 1990) для тонкозернистых обломочных образований с точками состава пелитов Лигурии и Корсики, по (Bracciali et al, 2007), а также мелкозернистых глинистых алевролитов и глинистых сланцев бирьянской подсвиты зильмердакской свиты верхнего рифея, аргиллитов басинской свиты верхнего венда Южного Урала и глинистых пород верхнего девона (кодинская и устькодинская свиты) Среднего Урала. 7. Диаграмма Ni–V–10Th для тонкозернистых обломочных образований с нанесенными на нее точками состава пелитов Лигурии и Корсики, по (Bracciali et al, 2007), мелкозернистых глинистых алевролитов и глинистых сланцев бирьянской подсвиты зильмердакской свиты верхнего рифея, аргиллитов басинской свиты верхнего венда Южного Урала, а также глинистых пород верхнего девона (кодинская и устькодинская свиты) Среднего Урала. Расшифровка состава пород источников сноса для петрогенных (прошедших только один цикл седиментации) осадочных образований может быть выполнена с использованием диаграммы Nb/Y–Zr/ TiO2 Geochemical and Nd-isotope references of main types of provenances (McLennan et al, 1993)
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