| Glass inclusions in volcanic rocks in the Okinawa Trough back-arc basin:constraints on magma genesis and evolution |
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| 作者姓名： | Yu Zenghui Zhai Shikui Li Xianzhong |
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| 作者单位： | Yu Zenghui，Zhai Shikui，Li Xianzhong 1. Ocean University of Qingdao，Qingdao 266003，China |
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| 基金项目： | The study was supported by the National Natural Science Foundation of China under contract Nos 49625609 and 49673194. |
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| 摘 要： | INTROOUcr1ONThe Okinawa Trough is a typical marginal back-arc basin, where its oPening began in rela-tively recent years* There is a great controversy about the origin of its initial magYna. haltand acid volcanic pumice make up the bimedal volcanism in the Okinawa Trough. MOSt of geol-ogists believed that the acid pumice was the preduct of extremely crystal fractionation of baseltInagTna, but the others argued that it should com from the melting of lower-crust. Som de-tailed petrolOgic…
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| 关 键 词： | Glass inclusion magma genesis and evolution Okinawa Trough |
| 收稿时间： | 2000/6/24 0:00:00 |
| 修稿时间： | 4/2/2001 12:00:00 AM |
Glass inclusions in volcanic rocks in the Okinawa Trough back-arc basin:constraints on magma genesis and evolution |
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| Yu Zenghui,Zhai Shikui,Li Xianzhong.Glass inclusions in volcanic rocks in the Okinawa Trough back-arc basin:constraints on magma genesis and evolution[J].Acta Oceanologica Sinica,2001,20(3):383-390. |
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| Authors: | Yu Zenghui Zhai Shikui and Li Xianzhong |
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| Institution: | Ocean University of Qingdao, Qingdao 266003, China |
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| Abstract: | The major element compositions of glass inclusions in plagioclase and pyroxene phenocrysts of basalt and pumice in the Okinawa Trough back-arc basin are determined by electron microprobe. The results indicate that basalt and pumice are cognate and respectively represent the products at early stages of magmatism and at late stage of crystal fractionation. The initial magma in the trough is rich in H2O. The variation of H2O content in magma may play an important role in the magma evolution. Plagioclase is the mineral crystallized throughout the whole magmatic process and accumulates in the zoned magma chamber. From these features it can be inferred that the initial magma in the Okinawa Trough, whose opening began in recent years, is seriously affected by fluid or other materials carried by subducting slab and the geochemical feature of volcanic rocks is in some degree similar to that of lavas in island-arc environments. |
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| Keywords: | Glass inclusion magma genesis and evolution Okinawa Trough |
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