| GAO Jinyao,ZHANG Tao,FANG Yinxia,YANG Chuanguo,MEI Sai. 2009. Faulting, magmatism and crustal oceanization of the Okinawa Trough. Acta Oceanologica Sinica, (3):40－49 |
| Faulting, magmatism and crustal oceanization of the Okinawa Trough |
| Faulting, magmatism and crustal oceanization of the Okinawa Trough |
| Received:January 23, 2008 Revised:June 09, 2008 |
| DOI： |
| Key words:Okinawa Trough fault graben uplift oceanic crust volcanic magma |
| 中文关键词: Okinawa Trough fault graben uplift oceanic crust volcanic magma |
| 基金项目:The National Major Fundamental Research and Development Project of China under contract Nos G2000046703 and 2007CB411702, and the Scientific Research Fund of the Second Institute of Oceanography, State Oceanic Administration under contract No.JT0705. |
| Author Name | Affiliation | E-mail | | GAO Jinyao | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | jygao@mail.hz.zj.cn | | ZHANG Tao | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | FANG Yinxia | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | YANG Chuanguo | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | MEI Sai | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | |
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| Abstract: |
| The paper focuses on the characteristics of faulting and magmatism of the Okinawa Trough and the relation between them. En-echelon grabens are ranked oblique to the continental shelf edge uplift, and the Longwang uplift, the rifting block ridge in the northern segment and the "Mianhua uplift" in the southern segment have possibly preserved characteristics of volcanism and magmatism occurring with those rifting phases. The clockwise rotation of the southern Ryukyu Islands, driven by collision between Luzon and Taiwan, has played a key role in the crustal oceanization, enhancing the crustal extension of the southern segment and inducing volcanic magmatism in those grabens, among which the Yaeyama graben is a typical example of the presence of oceanic crust. Faulting and magmatism were mainly migrating towards the island arc asymmetrically. The crustal oceanization of the Okinawa Trough is difficultly interpreted by the linear magnetic anomaly model, which is fit for the symmetric spreading of the mid-oceanic ridges. |
| 中文摘要: |
| The paper focuses on the characteristics of faulting and magmatism of the Okinawa Trough and the relation between them. En-echelon grabens are ranked oblique to the continental shelf edge uplift, and the Longwang uplift, the rifting block ridge in the northern segment and the "Mianhua uplift" in the southern segment have possibly preserved characteristics of volcanism and magmatism occurring with those rifting phases. The clockwise rotation of the southern Ryukyu Islands, driven by collision between Luzon and Taiwan, has played a key role in the crustal oceanization, enhancing the crustal extension of the southern segment and inducing volcanic magmatism in those grabens, among which the Yaeyama graben is a typical example of the presence of oceanic crust. Faulting and magmatism were mainly migrating towards the island arc asymmetrically. The crustal oceanization of the Okinawa Trough is difficultly interpreted by the linear magnetic anomaly model, which is fit for the symmetric spreading of the mid-oceanic ridges. |
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