Deep crustal structure of Baiyun Sag, northern South China Sea revealed from deep seismic reflection profile

Huang, Chunju; Zhou, Di; Sun, Zhen; Chen, Changmin; Hu, Hao

doi:10.1360/04wd0207

Cited by 105 publications

(87 citation statements)

References 18 publications

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“…Various theories have been advanced to explain why such great subsidence has occurred in this particular place, with some arguing that this extra subsidence is related to the intrusion of very dense, mafic magmatic bodies at the base of the crust (Shi et al 2005). Such models are largely based on seismic reflection images that suggest similarities between this continental margin and those which are known to have been affected by magmatism during breakup, such as Norway or East Greenland (Huang et al 2005). However, such approaches ignore the fact that magmatic underplating generates permanent uplift of continental margins, not extra subsidence, as has been recognized, for example, across the rifted margins of Northwest Europe (Brodie and White 1994;Hall and White 1994).…”

Section: Baiyun Sag Basinmentioning

confidence: 99%

Coupled onshore erosion and offshore sediment loading as causes of lower crust flow on the margins of South China Sea

Clift

2015

Geosci. Lett.

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Hot, thick continental crust is susceptible to ductile flow within the middle and lower crust where quartz controls mechanical behavior. Reconstruction of subsidence in several sedimentary basins around the South China Sea, most notably the Baiyun Sag, suggests that accelerated phases of basement subsidence are associated with phases of fast erosion onshore and deposition of thick sediments offshore. Working together these two processes induce pressure gradients that drive flow of the ductile crust from offshore towards the continental interior after the end of active extension, partly reversing the flow that occurs during continental breakup. This has the effect of thinning the continental crust under super-deep basins along these continental margins after active extension has finished. This is a newly recognized form of climate-tectonic coupling, similar to that recognized in orogenic belts, especially the Himalaya. Climatically modulated surface processes, especially involving the monsoon in Southeast Asia, affects the crustal structure offshore passive margins, resulting in these "load-flow basins". This further suggests that reorganization of continental drainage systems may also have a role in governing margin structure. If some crustal thinning occurs after the end of active extension this has implications for the thermal history of hydrocarbon-bearing basins throughout the area where application of classical models results in over predictions of heatflow based on observed accommodation space.

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Section: Baiyun Sag Basinmentioning

confidence: 99%

Coupled onshore erosion and offshore sediment loading as causes of lower crust flow on the margins of South China Sea

Clift

2015

Geosci. Lett.

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“…Both of the flanking basins trend in NE direction and are filled and covered with thick Cenozoic deposits. In the deepest rifted sag of Zhu-II depression, Pearl River Mouth Basin, 5 km thick sediments of the Neogene and Quaternary covers the even thicker Paleogene strata (Huang et al, 2005). Mesozoic sedimentary rocks were drilled in the Penghu-Peikang Rise (Taylor and Hayes, 1980) and Tainan Basin .…”

Section: Geological Settingmentioning

confidence: 99%

Late Mesozoic compressional folds in Dongsha Waters, the northern margin of the South China Sea

Yan

Wang

2014

Tectonophysics

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“…3) (Huang et al 2005). The Liwan Sag discovered recently lies in the southeast of the Baiyun Sag and very close to the continent-ocean boundary of the South China Sea.…”

Section: Geological Settingmentioning

confidence: 98%

“…The basement of the Pearl River Mouth Basin consists of Cretaceous and Jurassic granites in its central and northern portions, Mesozoic unmetamorphosed sedimentary rocks in the east, and Paleozoic quartzite and other metamorphic rocks in the west (Zhou et al 2008b). The crust underlain the basin thins from *30 km near the coast in the north to *11 km near the deep-sea basin in the south (Huang 2005;Kido et al 2001;Nissen et al 1995). Beneath the centers of sedimentary depressions, the Moho surface shoals significantly, for example, the crust thins rapidly to \7 km under the center of the Baiyun Sag and\9 km under the center of the Liwan Sag (Hu et al 2009;Wu et al 2005).…”

Section: Geological Settingmentioning

confidence: 99%

Cenozoic sedimentary evolution of deepwater sags in the Pearl River Mouth Basin, northern South China Sea

et al. 2013

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Recent exploration revealed the high potential for hydrocarbon in the deepwater sags, Pearl River Mouth Basin, northern South China Sea. This paper reports its Cenozoic sedimentary evolution through backstripping of high precision depth data of interpreted sequence boundaries. Local backstripping parameters were mapped based on well and geophysical data. Sensitivity analysis indicates that the reliability of decompaction results were largely improved by using the local porosity parameters and the lithological parameters that vary with grid nodes. Maps of sedimentation rates of 17 sequences from 65 Ma to the present were constructed, showing the spatial-temporal variation of the sedimentation rate. Three rapid depositional stages, 65-32, 29-23.3, 18.5-10.5 Ma, and three slow depositional stages, 32-29, 23.3-18.5, 10.5-0 Ma, were identified with abrupt changes of sedimentary patterns. The three rapid depositional stages were in accord with syn-rifting stage, the first post-rifting depositional stage, and the second post-rifting depositional stage, respectively. And the three slow depositional stages were in keeping with three tectonic events respectively. Several significant sedimentary discontinuities at 32, 23.3 and 10.5 Ma were observed and discussed. The comparison between the study area and the ODP Site 1148 at 32-23.3 Ma indicates that before *29 Ma the ODP Site 1148 was at similar sedimentation regime as that in the Baiyun and Liwan sags, but significant diversity appeared after *29 Ma, when a large quantity of terrigenous sediments was trapped by strong post-rifting subsidence in the Baiyun and Liwan sags and could not reach the lower slope areas. Study revealed that the most rapid accumulation from 18.5 to 17.5 Ma might be mainly owing to the large sediment supply during this strong monsoon period.

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Deep crustal structure of Baiyun Sag, northern South China Sea revealed from deep seismic reflection profile

Cited by 105 publications

References 18 publications

Coupled onshore erosion and offshore sediment loading as causes of lower crust flow on the margins of South China Sea

Coupled onshore erosion and offshore sediment loading as causes of lower crust flow on the margins of South China Sea

Late Mesozoic compressional folds in Dongsha Waters, the northern margin of the South China Sea

Cenozoic sedimentary evolution of deepwater sags in the Pearl River Mouth Basin, northern South China Sea

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