| 青藏高原北部新生代火山岩的成因机制 |
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| 引用本文： | 赖绍聪.青藏高原北部新生代火山岩的成因机制[J].岩石学报,1999,15(1):98-104. |
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| 作者姓名： | 赖绍聪 |
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| 作者单位： | 西北大学,地质系,西安,710069 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国土资源部深部地质项目，西北大学校科研和教改项目 |
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| 摘 要： | Based on the electron probe
analyses result of the minerals and the bulk rock composition of the Cenozoic volcanic
rocks from Yumen and Hoh Xil lithodistricts on the Qinghai-Tibet Plateau, the forming
conditions including temperature and pressure of those rocks are studied.According to the
thermodynamics calculation result of the mineral-melt equilibrium,the depth of the
asthenosphere superface (about 75～130km) for the northern part of the Qinghai-Tibet
Plateau during Cenozoic era is suggested. Finally, this paper indicates that the Cenozoic
volcanic rocks in the northern part of the Qinghai-Tibet Plateau mainly consist of
shoshonite series.Their forming temperature is 630～1039℃ and forming pressure is
between 2.3～4.0 GPa and formed in the intracontinental orogenic belt,where the primary
magma was originated from a particular enriched upmantle and accreted crust-mantle belt or
directly originated from asthenosphere superface by partial melting of pyrolite.
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| 关 键 词： | 青藏高原 新生代 火山岩 岩石成因 |
Petrogenesis of the Cenozoic volcanic rocks from the northern part of the Qinghai-Tibet Plateau |
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| Lai Shaocong.Petrogenesis of the Cenozoic volcanic rocks from the northern part of the Qinghai-Tibet Plateau[J].Acta Petrologica Sinica,1999,15(1):98-104. |
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| Authors: | Lai Shaocong |
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