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

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doi: 10.1016/j.tecto.2012.05.027
Author(s): Zhu Junjigan; Qiu Xuelin; Kopp, Heidrun; Xu Huilong; Sun Zongxun; Ruan Aiguo; Sun Jinlong; Wei Xiaodong
Author Affiliation(s): Primary:
Chinese Academy of Sciences, South China Sea Institute of Oceanology, Laboratory of Marginal Sea Geology, Guangzhou, China
Helmholtz Centre for Ocean Research Kiel, Germany
State Oceanic Administration, China
Volume Title: Tectonophysics
Source: Tectonophysics, Vol.554-557, p.18-29. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951 CODEN: TCTOAM
Note: In English. 86 refs.; illus., incl. sects., sketch maps
Summary: 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. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Baiyun Sag; Cenozoic; Continental crust; Cretaceous; Crust; Dongsha Rise; Faults; Geophysical methods; Geophysical surveys; Leg 184; Listric faults; Lithosphere; Lithostratigraphy; Magmatism; Mesozoic; Neogene; Neotectonics; Normal faults; North Pacific; Northwest Pacific; ODP Site 1148; Ocean Drilling Program; Oceanic crust; Offshore; Pacific Ocean; Petroleum; Petroleum exploration; Plate tectonics; Pliocene; Rifting; Seismic methods; South China Sea; Stratigraphic units; Strike-slip faults; Surveys; Tectonics; Tertiary; Transition zones; West Pacific; Zhujiang River basin
Coordinates: N185010 N185010 E1163356 E1163356
Record ID: 2013013300
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands