| 西藏阿里西部地区中酸性侵入岩的岩石化学研究 |
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| 引用本文： | 赵崇贺,李国良.西藏阿里西部地区中酸性侵入岩的岩石化学研究[J].地球科学,1987(3). |
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| 作者姓名： | 赵崇贺 李国良 |
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| 作者单位： | 武汉地质学院
(赵崇贺)，西藏第二地质队(李国良) |
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| 摘 要： | 西藏阿里西部地区中、酸性侵入岩广泛分布在冈底斯、北喜马拉雅、高喜马拉雅三个构造带中。钾-氩同位素年龄为189—2.2Ma,可以分为燕山早期、中期、晚期,喜山早期、中期五个侵入期。岩石化学、稀土元素和锶同位素的研究表明,形成本区石英闪长岩和花岗闪长岩的岩浆,来源于下地壳;形成花岗岩的岩浆,来源于上地壳.
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| 关 键 词： | 西藏 中、酸性侵入岩 岩石化学 |
THE PETROCHEMICAL STUDY OF THE INTERMEDIATE-ACIDIC INSTRUSIVE ROCKS IN WESTERN ALI, XIZANG (TIBET) |
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| Zhao Chonghe.THE PETROCHEMICAL STUDY OF THE INTERMEDIATE-ACIDIC INSTRUSIVE ROCKS IN WESTERN ALI, XIZANG (TIBET)[J].Earth Science-Journal of China University of Geosciences,1987(3). |
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| Authors: | Zhao Chonghe |
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| Abstract: | The intermediate-acidic intrusive rocks are widely
distributed in Western Ali, Xizang ( Tibet ) . They are mainly exposed in the belts of Gangdisi, North Himalaya and high Himalaya. Their K- Ar
ages are 189-2.2Ma. It can be divided into five stages: early Yanshanian, middle Yanshanian, late Yanshanian, early Himalayian and middle Himalayian. The study of petrochemical, REE and strontium isotope shows that the genesis of the quartz-dioritic and granodioritic magma in this area was caused by partial melting of the lower crust, but the granitic magma was formed by that of the upper crust. |
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| Keywords: | Xizang ( Tibet ) intermediate-acidic intrusive rocks petrochemistry |
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