Turga Lagerstätte (Middendorf’s Outcrop, Eastern Transbaikalia, Barremian–Aptian): Stratigraphic Range and Palaeoenvironments

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-11-01 DOI:10.2113/rgg20234625

I.N. Kosenko, E.B. Pestchevitskaya, V.D. Efremenko, E.K. Metelkin, P.A. Yan, A.P. Rodchenko, B.L. Nikitenko, D.A. Mirzabaev

引用次数: 1

Abstract

Abstract —The age of the Turga Formation in the Middendorf’s outcrop is determined as latest Barremian–earliest Aptian based on fauna and microfossil assemblages. The composition of the fauna and palynomorph assemblages allows correlations between the Turga Formation and the Yixian Formation and lower part of the Jiufotang Formation of Northeast China. Results of the petrographic and geochemical analysis as well as microfossil studies showed that sediments accumulated in a shallow lake with low-energy hydrodynamics, sometimes under low-oxygen conditions. Climate features (warm temperate climate transitional to subtropical) and type of vegetation (coniferous forests with admixture of hardwoods) are reconstructed taking into consideration the composition of spore-pollen assemblages.

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Turga Lagerstätte (Barremian-Aptian东外贝加尔米登多夫露头):地层范围和古环境

摘要/ Abstract摘要:根据动物群和微化石组合，确定了米登多夫露头图尔加组的时代为巴雷米亚晚期-阿普tian早期。动物群和苔藓组合的组成使东北图尔加组与义县组和九佛塘组下部的对比成为可能。岩石学和地球化学分析以及微化石研究结果表明，沉积物沉积在低能量水动力的浅湖中，有时在低氧条件下。考虑到孢粉组合的组成，重建了气候特征(暖温带气候向亚热带过渡)和植被类型(阔叶林混合)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.