Sedimentology and geochemistry of the Uk Formation, Upper Riphean, the Southern Urals

Литосфера. 2019;19(5):659-686 DOI 10.24930/1681-9004-2019-19-5-659-686

 

Journal Homepage

Journal Title: Литосфера

ISSN: 1681-9004 (Print); 2500-302X (Online)

Publisher: A.N. Zavaritsky Institute of Geology and Geochemistry

LCC Subject Category: Technology: Engineering (General). Civil engineering (General): Engineering geology. Rock mechanics. Soil mechanics. Underground construction

Country of publisher: Russian Federation

Language of fulltext: Russian, English

Full-text formats available: PDF

 

AUTHORS


A. V. Maslov (Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RAS)

D. V. Grazhdankin (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS)

S. A. Dub (Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RAS)

D. S. Melnik (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS; Novosibirsk State University)

T. M. Parfenova (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS; Novosibirsk State University)

A. V. Kolesnikov (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS)

N. V. Cherednichenko (3 Koptug av., Novosibirsk, 630090)

D. V. Kiseleva (Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RAS)

EDITORIAL INFORMATION

Double blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

Research subject. This article presents new data on carbonate facies of the upperUk subformation, Upper Riphean of theSouth Urals. A particular attention is paid to the distribution of rare-earth elements (REE) and yttrium (Y) in stromatolitic and intraclastic limestones and calcareous shales (bulk samples and their acetic acid leachates).Materials and methods. We have studied lithological features of limestones in the geological section and in thin sections. The contents of trace elements in rocks were determined by the ICP-MS method at the IGG UB RAS (Yekaterinburg), the composition of organic matter was determined at the IPGG SB RAS (Novosibirsk) by gas-liquid chromatography and chromatography-mass spectrometry.Results. The most representative section of the Upper Uk Subformation located along the eastern edge of the town Ust-Katav can be subdivided into several members of different lithology and thickness: (1) biohermdominated member comprising large microbialitic build-ups and inter-bioherm sediments (intraclastic limestones, calcareous biolaminites); (2) transitional member characterised by small bioherms alternating with other carbonates; (3) interbedded coarseand fine-grained limestones. The presence of molar-tooth structures in the carbonate rocks of Uk Formation made it possible to constrain the age of thisUpper Riphean formation to pre-CryogenianConclusions. There are similarities in REE and Y distribution in both clean (devoid of siliciclastic component) bulk limestone samples and in their acetic acid leachates. PAAS-normalised REE + Y patterns demonstrate positive La, Gd, Y anomalies and negative Eu, Ce anomalies. The latter suggest marine depositional environments for theUpper Uk stromatolitic limestones. The results of the pioneering research into the composition of bitumens and biomarkers from the Upper Uk Subformation have shown that carbonates and shales are depleted in the organic matter. The source material for the organic matter was provided by two types of communities comprising both eukaryotes and prokaryotes and inhabiting well aerated environment, perhaps with lowered salinity of marine water.