| Zhang Jiaqiang,Sun Yongfu,Jiang Xiaoli. 2000. Origin and evolution of alkali basaltic magma in the Okinawa Trough. Acta Oceanologica Sinica, (3):115－129 |
| Origin and evolution of alkali basaltic magma in the Okinawa Trough |
| Origin and evolution of alkali basaltic magma in the Okinawa Trough |
| Received:December 15, 1999 Revised:February 10, 2000 |
| DOI： |
| Key words:Basalt spinel melt inclusion magmatic origin magma evolution |
| 中文关键词: Basalt spinel melt inclusion magmatic origin magma evolution |
| 基金项目:This work was supported by the Youth Oceanic Science Foundation of State Oceanic Administration of China under contract No. 94-2. |
| Author Name | Affiliation | | Zhang Jiaqiang | Development and study center, Chinese Geological Survey Bureau, Beijing 100083, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China | | Sun Yongfu | First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China | | Jiang Xiaoli | First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China |
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| Abstract: |
| The contents of major element cromposition of the phenocrysts and the matrix glass as well as the spinel inclusions and the melt inclusion in the phenocrysts of the basalt dredged from Station 133 of the Okinawa Trough are determined by electron microprobe.The results show that the basalt is a dorgalite consisting of phenocrysts of bytownite, chrysolite, clinopyroxene and magnetite as well as labradorite microcrystal,matrix glass and a few bits of broken vein quartz.Glassy melt inclusion and chromohercynite or chrompleonaste exist in bytownite and chrysolite.The formation of the spinels is related to partial melting of mantle.The melt inclusions stand for a primary alkali dorgalitic magma,whose composition corresponds to olivine gabbro.The basaltic magma was generated from partial melting of spinel-lherzolite of the upper mantle and evolved in a process of "alkali dorgalitic magma→trachybasaltic magma→basaltic trachytic magma→trachytic magma".Assimilation and hybridization of crustal material may exist during magma upwelling in every evolutionary stage. |
| 中文摘要: |
| The contents of major element cromposition of the phenocrysts and the matrix glass as well as the spinel inclusions and the melt inclusion in the phenocrysts of the basalt dredged from Station 133 of the Okinawa Trough are determined by electron microprobe.The results show that the basalt is a dorgalite consisting of phenocrysts of bytownite, chrysolite, clinopyroxene and magnetite as well as labradorite microcrystal,matrix glass and a few bits of broken vein quartz.Glassy melt inclusion and chromohercynite or chrompleonaste exist in bytownite and chrysolite.The formation of the spinels is related to partial melting of mantle.The melt inclusions stand for a primary alkali dorgalitic magma,whose composition corresponds to olivine gabbro.The basaltic magma was generated from partial melting of spinel-lherzolite of the upper mantle and evolved in a process of "alkali dorgalitic magma→trachybasaltic magma→basaltic trachytic magma→trachytic magma".Assimilation and hybridization of crustal material may exist during magma upwelling in every evolutionary stage. |
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