| 高喜马拉雅淡色花岗岩形成的热模拟 |
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| 引用本文： | 石耀霖,王其允.高喜马拉雅淡色花岗岩形成的热模拟[J].地球物理学报,1997,40(5):667-676. |
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| 作者姓名： | 石耀霖 王其允 |
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| 作者单位： | 1. 中国科学技术大学研究生院（北京）, 北京 100039;
2. 伯克利加州大学地质和地球物理系, 美国 CA94720 |
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| 摘 要： | 地壳物质重熔形成高喜马拉雅淡色花岗岩需要在中地壳深度20多百万年前达到650℃以上的温度，但如何解释冷的印度板块向欧亚大陆俯冲时会产生这样的高温是一个难题，单一因素的解释往往不能解释全部地质观测事实．本文通过有限单元法定量化计算，提出多种因素的综合作用的假说，认为较合理的估计包括逆掩断层的幕式活动和间歇、摩擦剪切生热、高放射性元素含量和低热导率岩石的存在、高抬升剥蚀速度等因素．这些因素的组合才造成高喜马拉雅淡色花岗岩既能成带，但又只是断续的出现．
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| 关 键 词： | 热模拟 喜马拉雅 淡色花岗岩 |
| 收稿时间： | 1995-11-24 |
THERMAL MODELING OF THE FORMATION OF LEUCOGRANITES IN THE HIGHER HIMALAYA |
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| SHI YAO-LIN.THERMAL MODELING OF THE FORMATION OF LEUCOGRANITES IN THE HIGHER HIMALAYA[J].Chinese Journal of Geophysics,1997,40(5):667-676. |
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| Authors: | SHI YAO-LIN |
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| Affiliation: | 1. Graduate School, USTC, Academia Sinica, Beijing 100039, China;
2. Depatment of Geology and Geophysics, University of California, Berkeley, CA94720, USA |
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| Abstract: | Leucogranites in the Higher Himalaya was formed by partial melting of crustal rocks in the mid-crust, that required a temperature higher than 650℃ at 20Ma.Subduction of Indian plate brings surface rocks beneath the Higher Himalaya and tends to produce an overall cool environment, previous hypothesis, which usually only emphasizes a single factor, are incapable to explain the high mid-crust temperature. In this paper, finite element thermotectonic modeling was carried out. The computation results indicate that a special inverted geotherm, higher temperature in the mid-crust and lower temperature in the lower crust and upper mantle, can be produced by combination of a number of factors: episodic activation and cessation of major faults,frictional / shear heating, high radiogenic content and low thermal conductivity cover,high rate of denudation, warer supply from the foot wall to the hanging wall, etc.The Higher Himalaya leucogranite belt is thus formed by pantal melting of crustal rocks in an environment created by the combination of the above factors, missing of any one of the factors would prevent the partial melting, therefore, the occurrence of leucogranites is scattered. |
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| Keywords: | Thermal modeling Higher Himalaya Leucogranite |
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