| 羌塘盆地中央隆起带南侧隆额尼-昂达尔错古油藏白云岩地球化学特征及成因意义 |
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| 引用本文： | 刘建清,陈文斌,杨平,陈文西,付休根.羌塘盆地中央隆起带南侧隆额尼-昂达尔错古油藏白云岩地球化学特征及成因意义[J].岩石学报,2008,24(6):1379-1389. |
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| 作者姓名： | 刘建清 陈文斌 杨平 陈文西 付休根 |
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| 作者单位： | 成都地质矿产研究所,成都,10082 |
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| 摘 要： | 以系统的岩石学及沉积相分析为基础,深入探讨了隆额尼-昂迭尔错古油藏白云岩及其伴生灰岩的地球化学特征,认为该区白云岩化作用主要集中在古地理相对高点的潮上高能带、潮坪环境及台地边缘藻丘礁三个沉积相带内,白云岩及伴生灰岩在地球化学特征方面表现出近岸及淡水作用的深刻影响,和前人关于混合水白云岩化作用气候和古地理条件的基本论断是一致的.淡水作用依据主要体现在:①白云岩及伴生灰岩中不溶残渣特征表现为潮湿的古气候环境;②与白云岩伴生灰岩中Sr、Na含量与美国密苏里、田纳西等地淡水成因灰岩Sr、Na含量十分相近;③灰岩及白云岩中微量元素B含量及Sr/Ba指数、Sr/Ca指数,常量元素中m、Fe/Mn指数均反映出该区碳酸盐岩形成于近岸的碳酸盐台地环境,灰岩及白云岩均曾受到淡水的深刻作用和影响.该区白云岩过程中除Sr有明显的带出现象,Na、K有明显带入现象,大部分元素仍保存了其原始的组成特点.
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| 关 键 词： | 白云岩 淡水作用 地球化学 羌塘盆地 |
The Longeni-Angdanrco paelo-oil dolomite geochemical characteristcs in southern part of the central uplift zone of Qiangtang basin and it's significance |
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| LIU JianQing,CHEN WenBing,YANG Ping,CHEN WenXi,FU XiuGen.The Longeni-Angdanrco paelo-oil dolomite geochemical characteristcs in southern part of the central uplift zone of Qiangtang basin and it's significance[J].Acta Petrologica Sinica,2008,24(6):1379-1389. |
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| Authors: | LIU JianQing CHEN WenBing YANG Ping CHEN WenXi FU XiuGen |
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| Abstract: | Based on systematic analysis of lithological composition,microstructure and sedimentary facies,this paper mainly discusses the geochemical characteristics of Longeni-Angdanrco paleo-oil dolomite in southern part of the central uplift zone of Qiangtang basin.The dolomitization phenomenon mainly take place in the tidal high-energy belt,tidal-flat environment and plateau border algal head reef;the geochemical characteristics of dolomite and concomitant calcite are deeply affected by the costal and fresh water,... |
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| Keywords: | Dolomite Fresh water effect Geochemistry Qiangtang basin |
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