| 中上扬子北缘二叠纪碎屑岩组分和地球化学特征 |
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| 引用本文： | 孔为伦,王松,杜叶龙,万秋,李双应.中上扬子北缘二叠纪碎屑岩组分和地球化学特征[J].地球化学,2011(5):473-486. |
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| 作者姓名： | 孔为伦 王松 杜叶龙 万秋 李双应 |
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| 作者单位： | 合肥工业大学资源与环境工程学院,安徽合肥230009 |
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| 基金项目： | 安徽省自然科学基金（070415205）; 国家自然科学基金（40972082, 40572076）; 中国石油化工股份有限公司项目 |
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| 摘 要： | 对中上扬子北缘二叠纪碎屑岩成分和地球化学特征进行了分析.结果表明,本次研究的碎屑岩物源主要来自上部大陆壳,沉积旋回不高,大部分样品来自基性岩和长英质火山源区.主元素受到风化作用和沉积后作用的影响,对区分构造环境意义不大;几种非迁移性微量元素,如Cr、Co、Th、Sc、La和Zr,较主元素有区分构造环境意义.本次研究的碎...
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| 关 键 词： | 碎屑岩 地球化学 主元素 微量元素 稀土元素 物源 |
Composition and geochemistry of Permian clastic rocks in the northern margin of the Middle and Upper Yangtze region |
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| KONG Wei-lun,WANG Song,DU Ye-long,WAN Qiu and LI Shuang-ying.Composition and geochemistry of Permian clastic rocks in the northern margin of the Middle and Upper Yangtze region[J].Geochimica,2011(5):473-486. |
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| Authors: | KONG Wei-lun WANG Song DU Ye-long WAN Qiu and LI Shuang-ying |
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| Institution: | (School of Resources and Environment, Hefei University of Technology, Hefei 230009, China) |
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| Abstract: | The detrital modes and geochemical characteristics of Permian clastic rocks in the northern margin of the Middle and Upper Yangtze region are analyzed. The results show that these rocks are dominantly products of upper continental crust and have low degree of sediment recycling. Most samples were derived from basic and felsic volcanic rocks. However, major elements geochemistry is less useful for interpreting the tectonic setting,because of weathering and post-depositional process, than immobile trace elements such as Cr, Co, Th, Sc, La and Zr. The values of La/Sc, Th/Sc, Th/Co and Th/Cr of the clastic rocks show affinity closer to the upper continental crust and siliceous sandstone than the lower continental crust, oceanic crust and basic sandstone. Based on the composition and geochemical characteristics of major elements, trace elements and REE, it can be summarized that the tectonic settings of Xikou, Zhen’an county was mainly continental island arc-active continental margin which is similar to that of Shangdan Suture Zone, and the similarity of clastic rocks between Permian and Devonian may reflect the feature of paleo-continental margin of the North Qinling. The samples of Huaying Mountain were derived from multiple provenances of intraplate tectonic settings. |
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| Keywords: | clastic rocks geochemistry major elements trace elements REE provenance |
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