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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
Source PublicationMARINE GEOPHYSICAL RESEARCH
Volume37Issue:4Pages:281-296
Abstract

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.

SubtypeArticle
KeywordMoho Curie Point Depth Crustal Structure Tectonic Boundary Nansha Block South China Sea
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11001-016-9290-3
Indexed BySCI
Language英语
WOS KeywordCURIE-POINT DEPTH ; CONTINENT-OCEAN TRANSITION ; MAGNETIC ANOMALY DATA ; IODP EXPEDITION 349 ; AEROMAGNETIC DATA ; NW BORNEO ; SEISMIC STRATIGRAPHY ; ASIA COLLISION ; MARGIN ; MODEL
WOS SubjectGeochemistry & Geophysics ; Oceanography
WOS IDWOS:000392080000004
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/1694
Collection深海科学研究部_深海地球物理与资源研究室
研究生部
Corresponding AuthorWu shiguo
Affiliation1.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
First Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
GB/T 7714
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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