世界地质 2017, 36(2) 333-345 DOI:   10.3969/j.issn.1004-5589.2017.02.002  ISSN: 1004-5589 CN: 22-1111/P

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松辽盆地
泥岩盖层
矿物组成
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松辽盆地南部哈达山附近青山口组二、三段泥岩的岩石学与地球化学特征
孙潇, 刘立, 刘娜, 明晓冉
吉林大学地球科学学院, 长春 130061
摘要

以松辽盆地哈达山青山口组二、三段泥岩盖层为研究对象,通过岩石学和地球化学相结合的方法,对泥岩样品中常量元素和稀土微量元素特征进行了研究,结果表明:①泥岩稀土元素(∑REE)总量较高(104.99×10-6~281.88×10-6),∑ LREE/HREE比值较高(6.50~9.96),REE配分模式显示轻稀土元素富集而重稀土元素亏损,Eu(0.88~1.16)存在负异常等特征;②物源区母岩类型主要为沉积岩和中基性火山岩,源岩的钾交代作用成因可能为黏土矿物中的伊蒙混层转化为自生伊利石;③物源区泥岩修正后的CIA值(44.75~72.24)较低,暗示物源区经历了弱风化作用,Sr/Cu指标显示物源区长期受干热型气候控制。

关键词 松辽盆地   泥岩盖层   矿物组成   风化作用   物源区  
Petrological and geochemical characteristics of mudstone from the 2nd and 3rd Members of Qingshankou Formation near Hada Mountain in southern Songliao Basin
SUN Xiao, LIU Li, LIU Na, MING Xiao-ran
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract:

Taking the mudstone cap rocks in the 2nd and 3rd Members of Qingshankou Formation in Hada Mountain of Songliao Basin as an example, the authors studied the major elements and trace elements of rare earths in mudstone samples by combining the petrological and geochemical methods. The results show that: ①Mudstone has high amount of rare earth elements (104.99×10-6~281.88×10-6), high ∑ LREE/HREE ratio(6.50~9.96),and REE distribution patterns show enrichment in light rare earth elements and depletion in heavy rare earth element, with negative Eu anomaly(0.88~1.16); ②Source rock types are mainly sedimentary rocks and intermediate-basic volcanic rocks, the origin of potassium metasomatism of source rocks is likely related to the conversion of clay minerals from mixed-layer illite/smectite to authigenic illite; ③The revised CIA value(44.75~72.24)of provenance mudstone is low, suggesting that the provenance experienced weak weathering, and Sr/Cu value indicates that provenance was controlled by dry and hot climate for a long time.

Keywords: Songliao Basin   mudstone caprock   mineral composition   weathering   provenance  
收稿日期 2016-12-22 修回日期 2017-02-13 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2017.02.002
基金项目:

国家自然科学基金项目(41172091).

通讯作者: 刘立(1955),男,教授,博士生导师,主要从事储层、层序地层及沉积学方面的研究.E-mail:liuli0892@vip.sina.com
作者简介:
作者Email: liuli0892@vip.sina.com

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