临兴地区煤系泥岩微量元素特征及其地质意义

发布时间：2018-04-30 21:16

  本文选题：微量元素 + 物源示踪　； 参考：《煤田地质与勘探》2017年03期

【摘要】：为了研究鄂尔多斯盆地东缘临兴地区煤系泥岩微量元素特征及其对沉积、物源及古气候方面的指示意义,采用ICP-MS和ICP-AES对18个泥岩样品做微量元素分析。结果表明:微量元素中Li、Sc、Nb和Th等相对富集,而Sr、Rb、Ba和Cs等相对亏损,Be、Co、Zn和Mo等元素和地壳黏土岩中元素的平均含量相当;聚类距离选择为25和11时,微量元素的"Q"型聚类结果与沉积相划分结果吻合;Th/Sc、Th/U-Th、K2O-Rb以及多元素物源判别图等表明,研究区物源来自上地壳,以长英质物源和再旋回沉积物为主,有少量中基性物质的加入,且含砂率变化和重矿物组合的分布特征表明物源来自于临兴地区北部;利用泥岩Sr/Cu值及Sr、Ti和P等特征元素的含量变化推测,临兴地区从晚石炭世到早二叠世气候以湿润为主,且向干热转变。
[Abstract]:In order to study the trace element characteristics of coal series mudstone in Linxing area on the eastern margin of Ordos Basin and its significance to sediment, provenance and paleoclimate, the trace elements of 18 mudstone samples were analyzed by ICP-MS and ICP-AES. The results show that the relative enrichment of trace elements such as Li-sco NB and Th, while the relative depletion of elements such as Sr, RB, Ba and Cs are similar to the average contents of elements in crustal clay rocks, and the clustering distances are 25 and 11:00, respectively. The results of "Q" cluster of trace elements are in agreement with the results of sedimentary facies division. The results of Th- / ScScScThU-ThU-ThU / K _ 2O-Rb and multi-element provenances show that the source of trace elements in the study area is from the upper crust, mainly from felsic and recyclic sediments, with the addition of a small amount of intermediate and basic materials. The variation of sand content and the distribution of heavy mineral assemblage indicate that the material source came from the northern part of Linxing area, and based on the variation of Sr/Cu value of mudstone and the content change of Sr, Ti and P, it can be inferred that the climate of Linxing area from late Carboniferous to early Permian is mainly humid. And turn to dry heat.
【作者单位】： 山东省核工业二七三地质大队;中国矿业大学资源与地球科学学院;中国矿业大学煤层气资源与成藏过程教育部重点实验室;中联煤层气有限责任公司;
【基金】：国家自然科学基金项目(41672146,41541046) 国家科技重大专项课题(2016ZX05044-002,2016ZX05066-001)~~
【分类号】：P618.11
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本文编号：1826262