日本南海海槽斜坡盆地重力流沉积特征及其对俯冲构造的响应

孙辉; 姜涛; 李春峰; 徐乐

doi:10.3799/dqkx.2014.121

Volume 39 Issue 10

Oct. 2014

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Sun Hui, Jiang Tao, Li Chunfeng, Xu Le, 2014. Characteristics of Gravity Flow Deposits in Slope Basin of Nankai Trough and Their Responses to Subduction Tectonics. Earth Science, 39(10): 1283-1294. doi: 10.3799/dqkx.2014.121

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Sun Hui, Jiang Tao, Li Chunfeng, Xu Le, 2014. Characteristics of Gravity Flow Deposits in Slope Basin of Nankai Trough and Their Responses to Subduction Tectonics. Earth Science, 39(10): 1283-1294. doi: 10.3799/dqkx.2014.121

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Characteristics of Gravity Flow Deposits in Slope Basin of Nankai Trough and Their Responses to Subduction Tectonics

doi: 10.3799/dqkx.2014.121

Sun Hui^1
,,
Jiang Tao^{1
,
,},
Li Chunfeng²,
Xu Le¹

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

Received Date: 2014-03-20
Publish Date: 2014-10-01

Abstract

Abstract

Nankai trough is one of seismogenic zones known for massive earthquakes in the world. Gravity flow deposits in slope basin of Nankai trough accretionary prism record the active history of magesplay faults and the recurrences of great earthquakes. Based on the data of integrated ocean drilling program (IODP), this study explores the characteristics of gravity flow deposits in slope basin and illustrates their implications to the activities of magesplay faults and great earthquakes. The results show that the slope basin was filled successively with wedge-shaped mass transport deposits (MTDs), canyon system and superficial MTDs. Wedge-shaped MTDs developed in the initial stage of magesplay fault activity, which is wedge-shaped and mainly composed of muddy breccia, indicating continuous and strong activities of the magesplay faults at the initial stage. Canyon system consists of several kinds of canyons including slope canyons, great MTDs canyon and axial canyon, which are controlled by steepening slope, increasing regional interstitial fluid pressure and anisotropic uplifting. Superficial MTDs consist of stacking multi-stage low amplitude MTDs and represent as plenty of scars, which formed in a relatively short time, but extensively. It may be caused by the seafloor shaking during a great earthquake. These characteristics of gravity flow deposits record the history of magesplay fault activities and recurrences of great earthquakes as follows: 1.95-1.55 Ma, magesplay fault reactivated sharply at the initial stage which triggered slumps in the upper wall of magesplay fault; 1.55-1.07 Ma, coupling and activities of magesplay fault in the west domain caused strata compressed, deformed and energy assembled in the prism as well as in the magesplay fault; 1.07 Ma to now, energy in the mageplay fault was released discontinuously that resulted in multi great earthquakes.
- Nankai trough,
- accretionary prism,
- gravity flow,
- magesplay fault,
- earthquake,
- sediment

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References(44)

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