Shallow anatomy of a continent–ocean transition zone in the northern South China Sea from multichannel seismic data.

Zhu, Junjiang, Qiu, Xuelin, Kopp, Heidrun , Xu, Huilong, Sun, Zongxun, Ruan, Aiguo, Sun, Jinlong and Wei, Xiaodong (2012) Shallow anatomy of a continent–ocean transition zone in the northern South China Sea from multichannel seismic data. Tectonophysics, 554-557 . pp. 18-29. DOI 10.1016/j.tecto.2012.05.027.

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Abstract

The Cenozoic tectonic evolution of the South China Sea is reflected in diverse tectonic processes including continental rifting, seafloor spreading, subduction, terrane collision and strike-slip fault movement. A continent-ocean transition zone in the northern South China Sea caused by the lithospheric extension when the continent underwent break-up, rifting and later seafloor spreading, is clearly imaged in the multi-channel seismic data presented in this study. The morphological units of the continent-ocean transition zone are the rift-depression, the volcanic zone and tilted fault blocks. The volcanic zone represents a highest extension zone within the continent-ocean transition zone and is mainly distributed in the southern slope uplift zone along the northern passive margin of the South China Sea. The large listric-normal faults bounding the Dongsha Rise and Baiyun Sag are evidenced in the seismic image. The passive margin in the northern South China Sea underwent the wide-rift to narrow-rift process in the transition zone as inferred from the relation between the surface heat flow and initial rifted crustal thickness. The continent-ocean transition zone in the continental margin of the South China Sea is consistent with high heat flow zone (average 90 mW.m(-2)) observed in the previous heat flow measurements and at ODP Site 1148, and is manifested in a sharp change of the P-wave velocity. The rifted margin of the South China Sea is a non-typical magma poor passive margin or an intermediary form between the Iberian-type non-volcanic and the Greenland-type volcanic margin compared to the world's typical passive margins

Document Type: Article
Keywords: Continent ocean transition zone; Multi-channel seismic data; South China Sea; Continental passive margins; CRUSTAL STRUCTURE; HEAT-FLOW; LITHOSPHERIC EXTENSION; MAGNETIC-ANOMALIES; VORING PLATEAU; NE ATLANTIC; WEST IBERIA; MARGIN; EVOLUTION; ASIA
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.tecto.2012.05.027
ISSN: 0040-1951
Projects: Future Ocean
Date Deposited: 20 Sep 2012 10:55
Last Modified: 23 Sep 2019 16:35
URI: http://oceanrep.geomar.de/id/eprint/15301

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