| 西藏羌塘地区第三系火山岩及与羌塘盆地含油性关系的研究 |
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| 引用本文： | 王方正,赖旭龙,郭铁鹰,王家生.西藏羌塘地区第三系火山岩及与羌塘盆地含油性关系的研究[J].地球科学,1997,6(3). |
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| 作者姓名： | 王方正 赖旭龙 郭铁鹰 王家生 |
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| 作者单位： | 地球科学学院 |
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| 基金项目： | 国家“八五”西藏油气地勘专项 |
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| 摘 要： | 西藏羌塘地区火山岩主要见于第三系石坪顶组，主要岩石类型是呈熔岩被产出的火山熔岩，包括辉石粗安岩、角闪粗面岩、角闪英安岩、黑云母英安岩等，其次可见次火山岩相的黑云母英安质碎斑熔岩和黑云母粗面质碎斑熔岩，以及辉石黑云母花斑岩．它们均为陆相中心式喷发的产物．岩石化学上属钾玄岩组合，可进一步分为钾玄岩系列和高硅钾玄岩系列，具非常典型的二元岩浆混合成因火山岩的岩石化学特征．其ＲＥＥ及微量元素特点表明二元岩浆混合前两个端元岩浆分别来自幔源和壳源．这些火山岩岩浆热事件对盆地有机烃类转化为石油和天然气是有利的，而破坏作用仅仅发生在火山机构附近
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| 关 键 词： | 第三纪，火山岩，含油性，羌塘，西藏 |
RELATIONSHIP BETWEEN THE TERTIARY VOLCANIC ROCKS AND OIL POTENTIAL IN QIANGTANG AREA, TIBET |
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| Wang Fangzheng,Lai Xulong,Guo Tieying,Wang Jiasheng.RELATIONSHIP BETWEEN THE TERTIARY VOLCANIC ROCKS AND OIL POTENTIAL IN QIANGTANG AREA, TIBET[J].Earth Science-Journal of China University of Geosciences,1997,6(3). |
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| Authors: | Wang Fangzheng Lai Xulong Guo Tieying Wang Jiasheng |
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| Abstract: | The Cenozoic volcanic rocks in Qiangtang area, Tibet are distributed mainly at Tertiary Shipingding Formation. Main volcanic rocks occur in lava sheet and constitute mainly pyroxene latite, hornblende trachyte, hornblende dacite, biotite dacite etc.. Subvolcanic rocks include biotite dacitic porphyroclastic lava, biotite trachytic porphyroclastic lava and pyroxene biotite granophyte. All volcanic rocks are of terrestrial central volcanic projection. Petrochemically, they belong to shoshonitic association, and can be subdivided into shoshonitic and high Si shoshonitic series. They are of typical petrochemical character of binary magma mixed genetic volcanic rocks. REE and trace element patterns show that two end member magmas are derived from the mantle and crust before their mixing. These volcanic thermal events are useful for organic materials converting to oil and gas, with the destruction limited near the volcanic apparatus. |
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| Keywords: | Tertiary volcanic rocks oil potential Qiangtang Tibet |
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