拆离断层与大洋核杂岩: 一种新的海底扩张模式

余星; 初凤友; 董彦辉; 李小虎; 唐立梅

doi:10.3799/dqkx.2013.097

Volume 38 Issue 5

Sep. 2013

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Article Navigation > Earth Science > 2013 > 38(5): 995-1004

YU Xing, CHU Feng-you, DONG Yan-hui, LI Xiao-hu, TANG Li-mei, 2013. Detachment Fault and Oceanic Core Complex: A New Mode of Seafloor Spreading. Earth Science, 38(5): 995-1004. doi: 10.3799/dqkx.2013.097

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YU Xing, CHU Feng-you, DONG Yan-hui, LI Xiao-hu, TANG Li-mei, 2013. Detachment Fault and Oceanic Core Complex: A New Mode of Seafloor Spreading. Earth Science, 38(5): 995-1004. doi: 10.3799/dqkx.2013.097

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Detachment Fault and Oceanic Core Complex: A New Mode of Seafloor Spreading

doi: 10.3799/dqkx.2013.097

Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, SOA, Hangzhou 310012, China

Received Date: 2013-02-10
Publish Date: 2013-09-15

Abstract

Abstract

A new type of seafloor spreading mode has recently been well acknowledged among earth science community. It is different from normal magmatic spreading ridge. It is usually found along the slow or ultraslow spreading ridge where the segment is amagmatic or depleted in magma. The plate separation is mostly accommodated by detachment fault slipping. The low-angle large-offset detachment fault will uplift the footwall and exhume lower crust and upper mantle rocks, which is called oceanic core complex. The oceanic core complex, also named as megamullion, is often marked by corrugations and striations parallel to the extension direction. This paper presents the characteristics of this new kind of spreading mode based on in-depth argument about terminology of detachment fault and oceanic core complex. A distribution map of the known oceanic core complex has been composed. The possible methods and techniques that can be used to recognize oceanic core complexes are also discussed in this study, and so does the significance of the new findings and its influence on seafloor hydrothermal activity and mineral deposit.
- detachment fault,
- oceanic core complex,
- megamullion,
- seafloor spreading,
- tectonics,
- hydrothermal activity,
- petrology

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References(69)

References

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Detachment Fault and Oceanic Core Complex: A New Mode of Seafloor Spreading

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