On dynamic process and boundary faults’ kinematic characteristics of Nansha microplate

LIU Hai-ling; SUN Yan; GUO Ling-zhi; ZHOU Di; ZHANG Bo-you; SHU Liang-shu; ZHANG Yi-xiang; YANG Shu-kang

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LIU Hai-ling, SUN Yan, GUO Ling-zhi, ZHOU Di, ZHANG Bo-you, SHU Liang-shu, ZHANG Yi-xiang, YANG Shu-kang. On dynamic process and boundary faults’ kinematic characteristics of Nansha microplate[J]. Haiyang Xuebao, 2001, 23(5): 95-103.

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On dynamic process and boundary faults’ kinematic characteristics of Nansha microplate

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Earth Science Department, Nanjing University, Nanjing 210093, China
3.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
4.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 1998-11-24
Rev Recd Date: 2001-03-07

Abstract

Abstract

The features and present positions of the boundary faults of Nansha microplate and its dynamic process during Cenozoic are discussed.According to the view point of "interlayer-glide-dip-slip-strike-slip 4-dimensional associated fault systematic motion of laye-rblock tectonics",it is proposed that the microplate is enclosed by differe transcrustal faults and can be regarded as a typical Cenozoic microplate.Facts show that the northern boundary the micr oplate moves to the present location of Chang long-Huangy an seamount chain (spreading ridge fault zone) from Kangtai-Shuangzi-Xiongnan transcrustal normal dip-slip fault zone,Baxian-Baram-Yoca-Cuyo trascrustal reversed-slip thrust fault zone as the southern boundary,Wan'an-Natuna transcrustal strike-slip pullapatransfer zone as the western boundary and Manila-Panay transcrustal strike-slip compressional transfer zone as theastern boundary.These boundary fault zones take the same top layer of Nansha asthenosphere as their shared dtachmental layer.In the light of the viewpo int of multivariant dynamic force origin,the Cenozoic dynamic process the microplate can be divided into four stages.(1) K₂-E₂¹,the delamination of lower lithosphere of South Chin continental margin resulted in the microplateps dispersing away from the margin of SE China-Indochina continen paleo-South China Sea(SCS) southward subducting under Sunda craton in the SW section of the southern bounda and under the oceanic crust of eastern Calimantan-Sulawesi Sea in the SE section of the southern boundary respetively,and the formation of Sibuaccretion wedge.(2) E₂²-E₃¹,eastward hydraulic-pressure-transfe-rtype creepo the mantle flew under Tibet plateau lithosphere,eastward strike-slip extrusion of East A sian lithosphere and equtorward longitudinal inertia for cecaused by the incr ease of the earthps rotation rate,all of these forces initiated thopening of SW subbasin of the SCS,Sibu accretion wedge's collision with Kuching zone and the formation of C gayan-Kalumpang-Tungku-Sulu volcanic arc.(3) E₃²-N₁¹,the central subbasin of the SCS opened,Miriaccrtion wedge formed.Mean while,Sulawesi Sea northwards subducted under Sulu arccaused by northward driftin and compression of Australian plate,Sulu Sea opened in Cagayan-Suluarc.And the southern margin of N or Palawan continental block subducted under Cagayan volcanic ridge,like the A-type subjection.(4) N₁² to present the collision of the Australian-derived Banggai-Sula block with the northernarm of Sulawesi caused the southe boundary fault zone of the microplate thrusting and orogenic movementon a large-scale.And the spreading of the SCS stopped.
- Nansha microplate,
- boundary faults,
- interlayer-glide-dip-slip-strike-slip fault system,
- dynamic process,
- lithospheric de-root-delamination

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