NDLI: Isotopic-geochemical features of rocks of the Middle-Upper Cambrian Verkhnyaya Lena formation in the Siberian Craton

Content Provider	Springer Nature Link
Author	Vigradov, V. I. Belenitskaya, G. A. Pokrovsky, B. G. Bujakaite, M. I.
Copyright Year	2011
Abstract	Isotopic compositions of carbon and oxygen in carbonates and sulfur in sulfates of the Verkhnyaya Lena Formation (ε$_{2}$–ε$_{3}$), which terminates the Cambrian section of the Irkutsk Amphitheater of the Siberian Craton, are studied. Sulfates of the Verkhnyaya Lena Formation are marked by unusually low δ$^{34}$S values (4.6–12.0‰) relative to sulfates of the underlying Angara Formation. This is likely caused by variations in the facies-paleogeographic sedimentation at the transition of the Angara and Verkhnyaya Lena formations, as well as associated variations in the water and salt alimentation budget in sedimentation basins, due to their isolation from open sea and intensification of the continental and underground discharge. The δ$^{18}$O(PDB) value in carbonates decreases from −4.4‰ at bottom to −10.4‰ at top, reflecting variation in postsedimentary transformations and probable continuous freshening of sedimentation basin. Isotopic composition of carbon in most samples shows normal marine δ$^{13}$C values (0 ± 1‰). Only in some samples, does the δ$^{13}$C value increase up to −3.8 and 2.2‰ due to specific features of postsedimentary processes. The Rb-Sr systems of the clayey component of marls from the 500-m-thick section of the Angara Formation and bottom of the Verkhnyaya Lena Formation record an age of 512 ± 10 Ma, which is close to the assumed stratigraphic age of the Verkhnyaya Lena Formation. The $^{87}$Sr/$^{86}$Sr initial ratio is 0.7082 ± 0.0004.
Starting Page	71
Ending Page	84
Page Count	14
File Format	PDF
ISSN	00244902
Journal	Lithology and Mineral Resources
Volume Number	46
Issue Number	1
e-ISSN	16083229
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-01-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Mineralogy Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Economic Geology

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