| 羌塘盆地隆额尼-昂达尔错古油藏的白云岩组构特征及铅同位素意义 |
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| 关键词:dolomite lithologic structure Pb isotope Qiangtang basin |
| 基金项目:国家油气专项(编号:XQ2004-06) |
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| 摘要: |
| The Dolomite Fabric Characteristics and Lead Isotope Significance of the Ancient Oil Accumulation in Long'eni-Angdar Lake, Qiangtang Basin |
| Based on a systematic lithologic and sedimentary facies analysis,this paper deals in detail with Pb isotope characteristics of dolomite and associated limestone in the Long'eni-Angdar Co ancient oil accumulation.The dolomite and associated calcite seem to have the same Pb source,which was derived mainly from metamorphic rocks,magmatic rocks and recycled Triassic deposits in the uplift area of Qiangtang basin,thus probably being multi-source mixed anomalous lead from the mantle,the orogenic belt and the crust.The Pb content has distinctive relationship with sedimentary facies,still under the control of the sedimentary process.Late tectonic activities did not bring large quantities of hot fluids from the interior of the earth for the replacement of dolomite,and hence dolomite still preserves many typical structures of genetic significance,such as fogged center and clear margin,ring structure and generations of minerals,remnant oolitic texture and algal stromatolite.The dolomite might have resulted from mixed water replacement of calcite,and tectonic activities only exerted late alteration effects on dolomite. |
| LIU Jian-qing,CHENG Wen-bin,YANG Ping,CHEN Wen-xi,FU Xiu-gen.2008.The Dolomite Fabric Characteristics and Lead Isotope Significance of the Ancient Oil Accumulation in Long'eni-Angdar Lake, Qiangtang Basin[J].Acta Geoscientica Sinica,29(1):72-80. |
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