Origin and evolution of the alkali basaltic magma in the Okinawa Trough

Zhang Jiaqiang; Sun Yongfu; Jiang Xiaoli

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Article Navigation > Haiyang Xuebao > 2000 > 22(6): 63-72

Zhang Jiaqiang, Sun Yongfu, Jiang Xiaoli. Origin and evolution of the alkali basaltic magma in the Okinawa Trough[J]. Haiyang Xuebao, 2000, 22(6): 63-72.

Citation:

Zhang Jiaqiang, Sun Yongfu, Jiang Xiaoli. Origin and evolution of the alkali basaltic magma in the Okinawa Trough[J]. Haiyang Xuebao, 2000, 22(6): 63-72.

Zhang Jiaqiang, Sun Yongfu, Jiang Xiaoli. Origin and evolution of the alkali basaltic magma in the Okinawa Trough[J]. Haiyang Xuebao, 2000, 22(6): 63-72.

Citation:

Zhang Jiaqiang, Sun Yongfu, Jiang Xiaoli. Origin and evolution of the alkali basaltic magma in the Okinawa Trough[J]. Haiyang Xuebao, 2000, 22(6): 63-72.

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Origin and evolution of the alkali basaltic magma in the Okinawa Trough

1.
Development and Research Center, China Geological Survey, Beijing 100083;First Institute of Oceanography, State Oceanic Administration, Qingdao 266003
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266003

Received Date: 1999-06-02
Rev Recd Date: 1999-10-15

Abstract

Abstract

The contents of major clement composition of the phenocrysts and matrix glass as well as spinel inclusions and melt inclusions in the phenocrysts of the basalt dredged from 133 site 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 and matrix glass as well as a few bits of broken vein quartz.Glassy melt inclusions and chromohercynite or chrompleonaste exist in bytownite and chrysolite.The formation of spinels is related to fraction melting of the mantle.The melt inclusions stand for a primary alkali olivine basaltic magma,whose composition corresponds to olivine gabbro.The basaltic magma generated in fraction melting of spinel-lherzoliteof the upper mantle and evolved in a process of "alkali olivine basaltic magma→trachy-basahitic magma→basaltic trachyte magma→trachytic magma".Assimilation and contamination of crustal material may present during magma upwelling in every evolutionary stage.
- Basalt,
- spinel,
- melt inclusion,
- magmatic origin,
- magma evolution

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References(13)

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