| MAGMATIC EVOLUTION OF OKINAWA TROUGH DURING ITS EARLY SPREADING STAGE |
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| 作者姓名： | 翟世奎 陈丽蓉 申顺喜 毛雪瑛 柴之芳 马淑兰 |
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| 作者单位： | ZHAI Shi-kui CHEN Li-rong SHEN Shun-xi(Institute of Oceanology，Chinese Academy of Sciences，Qingdao 266071)MAO Xue-ying CHAI Zhi-fang and MA Shu-lan(Institute of High Energy Physics，Chinese Academy of Sciences，Beijing 100039) |
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| 基金项目： | Chinese Academy of Sciences project supported by Nationed Natural Science Foundation of China |
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| 摘 要： | The Okinawa Trough is different from other typical backarc spreading basins because the acidic vol-canic rock(pumice)is extensively distributed in it.Systematic mineralogical and petrochemical study on arepresentative core(Z14—5)to characterize the magmatic evolution of the Trough during its early spreading stage showed that the pumice magma was originally from the mantle,but underwent full crystallizationdifferentiation and was possibly contaminated by crust-derived material.With time,the acidic volcanic ac-tivities of the Okinawa Trough have an evolutional tendency of shifting to relatively basic magma activity.With further spreading of the Trough the magmatic activity will be intensified and the crust of the Troughwill develop from the transitional type to the oceanic type.
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| 收稿时间： | 2 September 1993 |
Magmatic evolution of Okinawa Trough during its early spreading stage |
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| Zhai Shi-kui,Chen Li-rong,Shen Shun-xi,Mao Xue-ying,Chai Zhi-fang,Ma Shu-lan.MAGMATIC EVOLUTION OF OKINAWA TROUGH DURING ITS EARLY SPREADING STAGE[J].Chinese Journal of Oceanology and Limnology,1994,12(3):246-254. |
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| Authors: | Zhai Shi-kui Chen Li-rong Shen Shun-xi Mao Xue-ying Chai Zhi-fang Ma Shu-lan |
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| Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao;(2) Institute of High Energy Physics, Chinese Academy of Sciences, 100039 Beijing |
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| Abstract: | The Okinawa Trough is different from other typical backarc spreading basins because the acidic volcanic rock (pumice) is extensively distributed in it. Systematic mineralogical and petrochemical study on a representative core (Z14-5) to characterize the magmatic evolution of the Trough during its early spreading stage showed that the pumice magma was originally from the mantle, but underwent full crystallization differentiation and was possibly contaminated by crust-derived material. With time, the acidic volcanic activities of the Okinawa Trough have an evolutional tendency of shifting to relatively basic magma activity. With further spreading of the Trough the magmatic activity will be intensified and the crust of the Trough will develop from the transitional type to the oceanic type. |
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| Keywords: | magmatic evolution Okinawa Trough early spreading stage |
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