冲绳海槽火山岩岩石系列的厘定及构造环境意义

国坤; 翟世奎; 于增慧; 蔡宗伟; 张侠

doi:10.3799/dqkx.2016.524

Volume 41 Issue 10

Oct. 2016

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Guo Kun, Zhai Shikui, Yu Zenghui, Cai Zongwei, Zhang Xia, 2016. Determination and Tectonic Significance of Volcanic Rock Series in the Okinawa Trough. Earth Science, 41(10): 1655-1664. doi: 10.3799/dqkx.2016.524

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Guo Kun, Zhai Shikui, Yu Zenghui, Cai Zongwei, Zhang Xia, 2016. Determination and Tectonic Significance of Volcanic Rock Series in the Okinawa Trough. Earth Science, 41(10): 1655-1664. doi: 10.3799/dqkx.2016.524

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Determination and Tectonic Significance of Volcanic Rock Series in the Okinawa Trough

doi: 10.3799/dqkx.2016.524

Guo Kun^{1,2
,},
Zhai Shikui^{1
,
,},
Yu Zenghui¹,
Cai Zongwei¹,
Zhang Xia¹

1.
Key Laboratory of Submarine Geosciences and Prospection of Ministry of Education, Ocean University of China, Qingdao 266100, China
2.
Institute of Oceanology of the Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2016-04-23
Publish Date: 2016-10-03

Abstract

Abstract

The Okinawa Trough is a young back-arc basin at its early back-arc spreading stage, and is a natural laboratory for understanding the formation and evolution of back-arc basins and crust-mantle interaction processes under this tectonic setting. However, with the gradually deepening of research work, the rock series of volcanic rocks from the Okinawa Trough are becoming an important and urgent need to solve problem. Based on the geochemical compositions of some pumices determined recently by authors and the petrologic and geochemical data of volcanic lavas from the Okinawa Trough in literatures, the rock series of volcanic rocks from the Okinawa Trough have been determined in detail. The tectonic significance of volcanic rocks and the genesis relationship between pumices and basalts have also been discussed. The magmatism in the Okinawa Trough is bimodal, being comprised dominantly of basic basalts and acidic rhyolites, accompanied by minor intermediate rocks. The basalts are mainly olivine tholeiitic basalts, which belong to subalkalic series, and the pumices are mostly rhyodacite or rhyolite, which belong to subalkalic series too. According to the geochemical compositions, basalts are not only similar to those from the mid-ocean ridge but also from the island arc tectonic environment. They are different from those occurring at mid-ocean ridge spreading center or mature back-arc basins, but with distinct geochemical features associated with distinct tectonic environment their occurred, a back-arc basin at early spreading stage. The acid pumice, a widely distributed rock type in Okinawa Trough, is characterized by the geochemical compositions that are typical for volcanic rocks from island arcs. The magma of intermediate-acidic pumices, with same sources as associated basalts, may be formed by fractional crystallization of basalt magma.
- rock series,
- magmatism,
- tectonic environment,
- Okinawa Trough,
- marine geology

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References(60)

References

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Determination and Tectonic Significance of Volcanic Rock Series in the Okinawa Trough

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