西伯利亚地台波德卡缅纳亚通古斯卡河下游埃文基地层的形成条件

IF 0.3 Q4 GEOLOGY
S. I. Merenkova, A. Yu. Puzik, I. V. Afonin, A. A. Medvedkov, E. S. Rabtsevich, R. R. Gabdullin, V. V. Pugach
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引用次数: 0

摘要

摘要 在苏洛迈居住区(克拉斯诺亚尔斯克边疆区埃文基市)附近的波德卡缅纳亚通古斯卡河右岸对西伯利亚地台埃文基地层进行了研究。研究描述了组成沉积物的结构和质地。确定了主要的岩石氧化物,并在此基础上确定了标准矿物成分。地层中陆相成分的增加表明了原产地(叶尼塞海脊)侵蚀加剧的时期。而地层中部长石成分的增加则表明干旱条件下物理风化的加剧。我们概述了埃文基地层以及其他新近和远古滩涂和沙布卡地层起源的主要假说。我们认为,所研究的埃文基地层岩相主要是在潮间带条件下堆积的,部分岩相可能是在潮上带下部条件下堆积的,潮间带和潮上带下部条件随海盆的潮汐波动而交替变化。我们建立了西伯利亚地台埃文基地层成因的概念模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Formation Conditions of the Evenki Formation in the Lower Reaches of the Podkamennaya Tunguska River, Siberian Platform

The Formation Conditions of the Evenki Formation in the Lower Reaches of the Podkamennaya Tunguska River, Siberian Platform

Abstract

The Evenki Formation of the Siberian Platform has been studied on the right bank of the Podkamennaya Tunguska River near the Sulomai settlement (Evenki municipal district of Krasnoyarsk krai). The structures and textures of the composing sediments are described. The main petrogenic oxides have been identified and the normative mineral composition has been determined following this identification. The increase of terrigenous components in the strata indicates periods of enhanced erosion in the provenance area (the Yenisei Ridge). In turn, the increased contribution of feldspars in the middle part of the section shows an intensification of physical weathering in arid conditions. The principal hypotheses of the origin of the Evenki Formation and other recent and ancient tidal flat and sabkha facies are outlined. We suggest that the studied facies of the Evenki Formation accumulated mostly under intertidal and, possibly in part, under lower supratidal conditions, which alternated depending on eustatic fluctuations in the basin. A conceptual model of the genesis of the Evenki Formation on the Siberian Platform has been developed.

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来源期刊
CiteScore
0.60
自引率
25.00%
发文量
43
期刊介绍: Moscow University Geology Bulletin  is the journal that mainly publishes scientific articles, short reports of graduate students, and reviews. Publications made by the members of the Faculty of Geology of the Moscow State University and their collaborators are published. Publications encompass all branches of geology.
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