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地质科学  2005, Vol. Issue (1): 84-94    DOI:
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黔北黑色岩系稀土元素地球化学特征及成因意义
杨剑, 易发成, 刘涛, 李虎杰
西南科技大学非金属矿研究所, 四川, 绵阳, 621002
REE GEOCHEMICAL CHARACTERS OF THE LOWER CAMBRIAN BLACK SHALE SERIES IN NORTHERN GUIZHOU AND THEIR ORIGINAL SIGNIFICANCE
Yang Jian, Yi Facheng, Liu Tao, Li Hujie
Institute of Nonmetallic Minerals, Southwest University of Science and Technology, Mianyang, Sichuan 621002
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摘要 本文采用ICPMS方法研究了黔北下寒武统牛蹄塘组黑色岩系的稀土元素地球化学特征和形成条件。黑色岩系稀土总量在金属富集层之Mo矿层中出现峰值,向剖面上、下大致依次减小,代表了一种非正常海水沉积作用。Eu、Ce呈负异常,反映黑色岩系形成于干燥气候的陆棚边缘浅海的还原环境。稀土模式,连同La/YbCe/La、La/YbREE图解特征,说明黑色岩系为正常海水与岩浆热卤水混合沉积的产物。
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杨剑
易发成
刘涛
李虎杰
关键词下寒武统黑色岩系   稀土元素地球化学   海相热水沉积   黔北     
Abstract: The REE geochemical characters and formational conditions of the black shale series in the Lower Cambrian Niutitang Formation in northern Guizhou were discussed based on ICP-MS analytical data. The ΣREE content of the black shale series reached its peak value in the Mo-bearing ore bed of metal-rich shales, and reduced upwards and downwards in the section, which might be caused by a sedimentary process with an abnormal seawater. The chondrite-normalized REE patterns was characterized with a curve tilting to the right and LREE enrichment. The negative anomalies of Eu and Ce showed that the black shale series were deposited in an epeiric sea environment. The REE patterns, plus La/Yb vs. Ce/La and La/Yb vs. REE diagrams, indicated that the black shale series resulted from mixing of normal seawater sediments and hot bittern seawater sediments from magma.
Key wordsThe Lower Cambrian black shale series   REE geochemistry   Marine hydrothermal sediments   Northern Guizhou   
收稿日期: 2003-07-29;
基金资助:四川省教育厅资助项目
引用本文:   
杨剑,易发成,刘涛等. 2005, 黔北黑色岩系稀土元素地球化学特征及成因意义. 地质科学, (1): 84-94.
Yang Jian,Yi Facheng,Liu Tao et al. REE GEOCHEMICAL CHARACTERS OF THE LOWER CAMBRIAN BLACK SHALE SERIES IN NORTHERN GUIZHOU AND THEIR ORIGINAL SIGNIFICANCE[J]. Chinese Journal of Geology, 2005, (1): 84-94.
 
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[1] 易发成, 杨剑, 侯兰杰, 汪建中. 黔北黑色岩系的铂族元素地球化学特征及成因探讨[J]. 地质科学, 2004, (3): 367-374.
[2] 彭建堂, 胡瑞忠, 漆亮, 蒋国豪. 晴隆锑矿床中萤石的稀土元素特征及其指示意义[J]. 地质科学, 2002, (3): 277-287.
 
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