| Mineralogical evidence for continental deep subduction |
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| 作者姓名： | ZHENGYongfei |
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| 作者单位： | SchoolofEarthandSpaceSciences,UniversityofScienceandTechnologyofChina,Hefei230026,China |
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| 摘 要： | Diamond is an index mineral to prove ultrahigh pressure (UHP) metamorphic conditions because it is only stable at the pressures above 3.3 GPa. Its occurrence in eclogite-facies metamorphic rocks suggests plate subduction to depths over 120 km assuming the normal gradient of lithostatic pressure. Because UHP eclogites are the metamorphic products of basaltic rocks, the occurrence of diamond in the eclogites demonstrates a complete geodynamic cycle in that mafic crustal rocks were subducted t…
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| 关 键 词： | 矿物学 超高压 石英 地球表面 正态重力梯度 |
| 收稿时间： | 2003-04-18 |
Mineralogical evidence for continental deep subduction |
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| ZHENGYongfei.Mineralogical evidence for continental deep subduction[J].Chinese Science Bulletin,2003,48(10):952-954. |
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| Authors: | Yongfei Zheng |
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| Institution: | ZHENG Yongfei School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Diamond is an index mineral to prove ultrahigh pressure (UHP) metamorphic conditions because it is only stable at the pressures above 3.3 GPa. Its occurrence in eclogite-facies metamorphic rocks suggests plate subduction to depths over 120 km assuming the normal gradient of lithostatic pressure. Because UHP eclogites are the metamorphic products of basaltic rocks, the occurrence of diamond in the eclogites demonstrates a complete geodynamic cycle in that mafic crustal rocks were subducted to mantle depths at once and then returned back to the Earth's surface. |
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