Thinned crustal structure and tectonic boundary of the Nansha Block, southern South China Sea
Dong, Miao2; Wu, Shi-Guo2; Zhang, Jian1; Wu shiguo
2016-12-01
发表期刊MARINE GEOPHYSICAL RESEARCH
卷号37期号:4页码:281-296
摘要

The southern South China Sea margin consists of the thinned crustal Nansha Block and a compressional collision zone. The Nansha Block's deep structure and tectonic evolution contains critical information about the South China Sea's rifting. Multiple geophysical data sets, including regional magnetic, gravity and reflection seismic data, reveal the deep structure and rifting processes. Curie point depth (CPD), estimated from magnetic anomalies using a windowed wavenumber-domain algorithm, enables us to image thermal structures. To derive a 3D Moho topography and crustal thickness model, we apply Oldenburg algorithm to the gravity anomaly, which was extracted from the observed free air gravity anomaly data after removing the gravity effect of density variations of sediments, and temperature and pressure variations of the lithospheric mantle. We found that the Moho depth (20 km) is shallower than the CPD (24 km) in the Northwest Borneo Trough, possibly caused by thinned crust, low heat flow and a low vertical geothermal gradient. The Nansha Block's northern boundary is a narrow continent-ocean transition zone constrained by magnetic anomalies, reflection seismic data, gravity anomalies and an interpretation of Moho depth (about 13 km). The block extends southward beneath a gravity-driven deformed sediment wedge caused by uplift on land after a collision, with a contribution from deep crustal flow. Its southwestern boundary is close to the Lupar Line defined by a significant negative reduction to the pole (RTP) of magnetic anomaly and short-length-scale variation in crustal thickness, increasing from 18 to 26 km.

文章类型Article
关键词Moho Curie Point Depth Crustal Structure Tectonic Boundary Nansha Block South China Sea
WOS标题词Science & Technology ; Physical Sciences
DOI10.1007/s11001-016-9290-3
收录类别SCI
语种英语
关键词[WOS]CURIE-POINT DEPTH ; CONTINENT-OCEAN TRANSITION ; MAGNETIC ANOMALY DATA ; IODP EXPEDITION 349 ; AEROMAGNETIC DATA ; NW BORNEO ; SEISMIC STRATIGRAPHY ; ASIA COLLISION ; MARGIN ; MODEL
WOS类目Geochemistry & Geophysics ; Oceanography
WOS记录号WOS:000392080000004
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.idsse.ac.cn/handle/183446/1694
专题深海科学研究部_深海地球物理与资源研究室
研究生部
通讯作者Wu shiguo
作者单位1.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
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Dong, Miao,Wu, Shi-Guo,Zhang, Jian,et al. Thinned crustal structure and tectonic boundary of the Nansha Block, southern South China Sea[J]. MARINE GEOPHYSICAL RESEARCH,2016,37(4):281-296.
APA Dong, Miao,Wu, Shi-Guo,Zhang, Jian,&Wu shiguo.(2016).Thinned crustal structure and tectonic boundary of the Nansha Block, southern South China Sea.MARINE GEOPHYSICAL RESEARCH,37(4),281-296.
MLA Dong, Miao,et al."Thinned crustal structure and tectonic boundary of the Nansha Block, southern South China Sea".MARINE GEOPHYSICAL RESEARCH 37.4(2016):281-296.
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