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地质学,西宁盆地晚始新世泥岩地层粒度特性及其古情况指表示义

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西宁盆地晚始新世泥岩地层粒度特性及其古情况指表示义

职称论文发布的价钱

职称论文发布期刊择要: 西宁盆地较为完好地保管着一套重生代(约55~17Ma)地层,盆地内的水湾村左近出露的晚始新世石膏-白色泥岩旋回堆积序列,是研讨晚始新世天气演化的抱负地质记载。关于这套地层的堆积情况存在差别的观念,尤其是关于此中泥岩地层成因的争论颇多,次要有洪积扇远端堆积、淡水深湖堆积和风积成因三种观念,差异甚大,至今没有一致的看法。堆积物的粒度可以用来反演其构成时的堆积动力及堆积情况,为了明白该段地层中泥岩的堆积情况,本文选打水湾剖面代表性泥岩样品停止了条理的粒度丈量及剖析,后果标明西宁盆地晚始新世泥岩堆积与黄土高原典范黄土-古泥土粒度特性相似,应为风积地层,而不是洪积扇远端或淡水深湖堆积。西宁盆地晚始新世风积地层的发明为盆地域域结构和古天气演化研讨提供新的研讨视角。

要害词: 古天文学;西宁盆地;晚始新世;泥岩-石膏旋回;粒度特性;风积地层

HOU Jili1,, LIU Xiuming2,*, MA Mingming1,, ZHANG Yuyin2,, WU Haibin3,
(  1、School of Geographical Sciences,Fujian Normal University,Fuzhou 350007;       2、 Key Laboratory of Humid Subtropical Eco-geographical Process (Fujian Normal University),Ministry of Education, Fuzhou 350007;       3、Department of Environmental and Sciences,Macquarie University,Sydney NSW 2109,Australia;  )
Abstract: A continuous sequence of Cenozoic sediments (about 55~17Ma) is preserved in Xining Basin.In this basin,the Shuiwan section which is characterized by multi-cycle of mudstone and gypsum deposits that formed during late Eocene (about 40~33.3Ma) is an ideal site for the study of the paleoclimate evolution.Three different opinions were raised for the origin of mudstone:a distal alluvial fan environment,a deep saline lake environment,and even aeolian deposits.Granularity of sediments can be used to reveal their deposit dynamics and conditions.So in order to reveal the depositional environment of the mudstone-depositions,some pilot samples were collected from Shuiwan section,and systematic and detailed grain size measurements were conducted.The results show that the grain size properties of mudstone are similar with those of typical loess-palaeosol of Chinese Loess Plateau (CLP),so the mudstones should be aeolian deposits,but not distal alluvial fan or deep saline lake sediments.This view provides a new sight for regional tectonic and paleoclimate evolution studies in Xining Basin during late-Eocene.
Keywords: Paleogeography; Xining Basin; late-Eocene; Mudstone-Gypsum cycles; grain size; Aeolian deposits

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