REE geochemical characteristics and geological significance of sedimentary rocks of the Lower Permian Zhanjin Formation in central uplift zone of Qiangtang Basin, northern Tibet Plateau

doi:10.7605/gdlxb.2014.06.073

JOPC ›› 2014, Vol. 16 ›› Issue (6): 926-934. doi: 10.7605/gdlxb.2014.06.073

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REE geochemical characteristics and geological significance of sedimentary rocks of the Lower Permian Zhanjin Formation in central uplift zone of Qiangtang Basin, northern Tibet Plateau

Hu Junjie¹, Li Qi¹, Fang Nianqiao¹, Yang Jingyi², Huang Jing¹, Chen Ruoyu¹

1 School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083
2 School of Earth and Space Science, Peking University, Beijing 100871

Received:2014-04-09 Revised:2014-06-30 Online:2014-12-01 Published:2014-12-01
About author:Hu Junjie,born in 1987,is a Ph.D. candidate in School of Ocean Sciences,China University of Geosciences(Beijing). Now he is mainly engaged in researches on marine geology,sedimentology and carbonate reservoir geology. E-mail: howimet@foxmail.com.
About the corresponding author Li Qi,born in 1969,is an associate professor of China University of Geosciences(Beijing). Now he is mainly engaged in researches on marine geology and sedimentary basin analysis. E-mail: liqi@cugb.edu.cn

藏北羌塘盆地中央隆起带下二叠统展金组沉积岩稀土元素地球化学特征及其地质意义

胡俊杰¹,李琦¹,方念乔¹,杨静懿²,黄静¹,陈若瑜¹

1 中国地质大学(北京)海洋学院,北京 100083
2 北京大学地球与空间科学学院,北京 100871

作者简介:胡俊杰,男,1987年生,博士研究生,主要从事海洋地质学、沉积学和储层沉积学研究。E-mail: howimet@foxmail.com。
通讯作者简介李琦,男,1969年生,中国地质大学(北京)海洋学院副教授,主要从事海洋地质学、沉积盆地分析等领域研究。E-mail: liqi@cugb.edu.cn。
基金资助:
中国地质调查局“羌塘盆地油气地球化学实验技术及应用研究”项目(编号:1212011221112)资助

Abstract

Abstract: There is a hot debate on the Neopaleozoic tectonic evolution history of central uplift zone of Qiangtang Basin,northern Tibet Plateau. The clastic sedimentary strata,with great geological significance for the research on palaeogeography and tectonic setting of study area,were discovered in the Lower Permian Zhanjin Formation of the Well Qiangzi 5 in Jiaomuri area of central uplift zone. Based on the rare earth element(REE)geochemical analysis of 17 samples of silty mudstone and muddy siltstone,the data show that the ΣREE is entirely high,and the ratios of ΣLREE/ΣHREE and La_N/Yb_N indicate that the differentiation is slight. The Ce_anom,Ce/Ce^* and Eu/Eu^* ratios suggest that the sedimentary rocks of Zhanjin Formation formed in a certain depth of shallow water. The La_n/Yb_n values decrease gradually from bottom to top in the Well Qiangzi 5,which reflects that the sedimentary rate at the bottom sequence is lower than at the upper sequence. The REE geochemical characteristics and relative parameters imply that the sedimentary rocks of Zhanjin Formation were mainly derived from the basalt and sedimentary rocks. The critical characteristic parameters,as well as the La-Th-Sc tectonic discrimination diagram imply an arc-like tectonic setting for the depositional basin of Zhanjin Formation.

Key words: Qiangtang Basin, central uplift zone, Permian, Zhanjin Formation, REE characteristics, geochemistry

摘要： 对于青藏高原北部羌塘盆地中央隆起带晚古生代的构造演化历史,学术界目前仍存在不同观点。位于盆地中央隆起带角木日地区的羌资5井揭示出的下二叠统展金组细碎屑岩,对于该地区古地理研究和构造背景约束具有重要意义。通过对该井中17个展金组粉砂质泥岩和泥质粉砂岩样品的稀土元素地球化学研究表明:样品 ω(ΣREE) 整体较高,ω(ΣLREE)/ω(ΣHREE)及(La/Yb)_N等比值显示其具有较弱的轻、重稀土元素分异;Ce_anom,Ce/Ce^*,Eu/Eu^*等参数反映样品主要形成于具有一定深度的浅海还原环境;(La/Yb)_N值自下而上呈降低趋势,表明下部的沉积速率低于上部。稀土元素组合及其比值特征指示展金组物源以玄武岩和沉积岩混合为主。根据La-Th-Sc构造背景判别图解分析,并与不同构造背景下的杂砂岩稀土元素特征比较,认为展金组沉积岩的物源可能来自于具有类似岛弧构造特征的环境。

关键词: 羌塘盆地, 中央隆起带, 二叠系, 展金组, 稀土元素特征, 地球化学

CLC Number:

P595

Hu Junjie, Li Qi, Fang Nianqiao, Yang Jingyi, Huang Jing, Chen Ruoyu. REE geochemical characteristics and geological significance of sedimentary rocks of the Lower Permian Zhanjin Formation in central uplift zone of Qiangtang Basin, northern Tibet Plateau[J]. JOPC, 2014, 16(6): 926-934.

胡俊杰,李琦,方念乔,杨静懿,黄静,陈若瑜. 藏北羌塘盆地中央隆起带下二叠统展金组沉积岩稀土元素地球化学特征及其地质意义[J]. 古地理学报, 2014, 16(6): 926-934.

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REE geochemical characteristics and geological significance of sedimentary rocks of the Lower Permian Zhanjin Formation in central uplift zone of Qiangtang Basin, northern Tibet Plateau

藏北羌塘盆地中央隆起带下二叠统展金组沉积岩稀土元素地球化学特征及其地质意义

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REE geochemical characteristics and geological significance of sedimentary rocks of the Lower Permian Zhanjin Formation in central uplift zone of Qiangtang Basin, northern Tibet Plateau

藏北羌塘盆地中央隆起带下二叠统展金组沉积岩稀土元素地球化学特征及其地质意义

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