Paleoenvironmental Evolution and Organic Matter Enrichment Genesis of the Late Turonian Black Shale in the Southern Songliao Basin, NE China

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Acta Geologica Sinica ‐ English Edition Pub Date : 2024-10-28 DOI:10.1111/1755-6724.15209
Jing BAI, Xingyou XU, Weibin LIU, Wenzhi ZHAO, Hang JIANG
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Abstract

The Upper Cretaceous Qingshankou Formation black shales, deposited in the late Turonian (LTB shales), are the main source rocks of the Songliao Basin. The origins of organic matter enrichment of the shales is a contentious subject fuelling many ongoing debates. This study investigates the genesis of the organic matter-rich shale by using molecular geochemistry. The LTB shales can be divided into three sections. The Section I shales were deposited in saline, stratified and anoxic water conditions, which are related to seawater incursion events. At least three episodic and periodic seawater incursion events were recognized during Section I shale deposition. The Section II shales deposited in brackish to fresh and deep lake-level conditions with high primary productivity, which are related to lake-level transgression. The Section III shales were deposited under fresh and slightly oxidized water conditions, which are related to lake-level regression. Two organic matter enrichment models for the LTB shales are identified, that is, the seawater incursion model and the maximum lake-level transgression sedimentation model, which act on different shale sections, both playing significant roles in the enrichment of organic matter.

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中国东北松辽盆地南部晚都龙统黑色页岩古环境演化及有机质富集成因
沉积于晚都龙纪的上白垩统青山口组黑色页岩(LTB页岩)是松辽盆地的主要源岩。页岩中有机质富集的起源是一个有争议的问题,引发了许多持续的争论。本研究利用分子地球化学方法研究了富含有机质页岩的成因。LTB 页岩可分为三个部分。第一段页岩沉积在含盐、分层和缺氧的水环境中,这与海水入侵事件有关。在第一段页岩沉积期间,至少发现了三次偶发性和周期性的海水侵入事件。第二段页岩沉积在咸水至淡水和深湖水位条件下,初级生产力较高,这与湖泊水位跃迁有关。第三段页岩沉积在淡水和轻度氧化水条件下,这与湖泊水位退缩有关。LTB页岩有两种有机质富集模式,即海水入侵模式和最大湖泊位移沉积模式,它们作用于不同的页岩段,都对有机质的富集起着重要作用。
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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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