Seismic stratigraphy of the central South China Sea basin and implications for neotectonics

Coring/logging data and physical property measurements from International Ocean Discovery Program Expedition 349 are integrated with, and correlated to, reflection seismic data to map seismic sequence boundaries and facies of the central basin and neighboring regions of the South China Sea. First‐order sequence boundaries are interpreted, which are Oligocene/Miocene, middle Miocene/late Miocene, Miocene/Pliocene, and Pliocene/Pleistocene boundaries. A characteristic early Pleistocene strong reflector is also identified, which marks the top of extensive carbonate‐rich deposition in the southern East and Southwest Subbasins. The fossil spreading ridge and the boundary between the East and Southwest Subbasins acted as major sedimentary barriers, across which seismic facies changes sharply and cannot be easily correlated. The sharp seismic facies change along the Miocene‐Pliocene boundary indicates that a dramatic regional tectonostratigraphic event occurred at about 5 Ma, coeval with the onsets of uplift of Taiwan and accelerated subsidence and transgression in the northern margin. The depocenter or the area of the highest sedimentation rate switched from the northern East Subbasin during the Miocene to the Southwest Subbasin and the area close to the fossil ridge in the southern East Subbasin in the Pleistocene. The most active faulting and vertical uplifting now occur in the southern East Subbasin, caused most likely by the active and fastest subduction/obduction in the southern segment of the Manila Trench and the collision between the northeast Palawan and the Luzon arc. Timing of magmatic intrusions and seamounts constrained by seismic stratigraphy in the central basin varies and does not show temporal pulsing in their activities.

[1]  A. Koppers.  On the 40 Ar/ 39 Ar Dating of Low-Potassium Ocean Crust Basalt from IODP Expedition 349, South China Sea , 2014 .

[2]  Xixi Zhao,et al.  Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349 , 2014 .

[3]  S. Ladage,et al.  Evolution of the South China Sea: Revised ages for breakup and seafloor spreading , 2014 .

[4]  Jiabiao Li,et al.  Deep structures of the Palawan and Sulu Sea and their implications for opening of the South China Sea , 2014 .

[5]  L. Li,et al.  Non‐uniform hyper‐extension in advance of seafloor spreading on the vietnam continental margin and the SW South China Sea , 2014 .

[6]  Brian Taylor,et al.  Origin and History of the South China Sea Basin , 2013 .

[7]  B. Taylor,et al.  The tectonic evolution of the South China Basin , 2013 .

[8]  Jiabiao Li,et al.  Seismic stratigraphy and tectonic structure from a composite multi-channel seismic profile across the entire Dangerous Grounds, South China Sea , 2013 .

[9]  Chupeng Yang,et al.  Characteristics and evolution of Cenozoic sediments in the Liyue Basin, SE South China Sea , 2012 .

[10]  Chun‐Feng Li,et al.  Mesozoic and early Cenozoic tectonic convergence-to-rifting transition prior to opening of the South China Sea , 2012 .

[11]  Yigang Xu,et al.  Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design , 2012 .

[12]  Chun‐Feng Li,et al.  Magnetic recording of the Cenozoic oceanic crustal accretion and evolution of the South China Sea basin , 2012 .

[13]  C. S. Hutchison,et al.  What are the Spratly Islands , 2010 .

[14]  Jiabiao Li,et al.  Depths to the magnetic layer bottom in the South China Sea area and their tectonic implications , 2010 .

[15]  Michael Schnabel,et al.  The continent-ocean transition at the southeastern margin of the South China Sea , 2010 .

[16]  T. McHargue,et al.  The Red River Fault zone in the Yinggehai Basin, South China Sea , 2009 .

[17]  Jiabiao Li,et al.  Magnetic zoning and seismic structure of the South China Sea ocean basin , 2008 .

[18]  Shi Xue-fa,et al.  Major element, trace element, and Sr, Nd and Pb isotope studies of Cenozoic basalts from the South China Sea , 2008 .

[19]  Jiabiao Li,et al.  Structures of the northeasternmost South China Sea continental margin and ocean basin: geophysical constraints and tectonic implications , 2007 .

[20]  Xian‐Hua Li,et al.  Formation of the 1300-km-wide intracontinental orogen and postorogenic magmatic province in Mesozoic South China: A flat-slab subduction model , 2007 .

[21]  Yukun Jiang,et al.  The temporal and spatial distribution of volcanism in the South China Sea region , 2006 .

[22]  Zhen Sun,et al.  The sedimentary and tectonic evolution of the Yinggehai-Song Hong basin and the southern Hainan margin, South China Sea : Implications for Tibetan uplift and monsoon intensification , 2006 .

[23]  Tao Sun,et al.  Petrogenesis of Mesozoic granitoids and volcanic rocks in south China : a response to tectonic evolution. , 2006 .

[24]  Yi-Ching Yeh,et al.  New Bathymetry and Magnetic Lineations Identifications in the Northernmost South China Sea and their Tectonic Implications , 2004 .

[25]  R. Hall.  Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific: computer-based reconstructions, model and animations , 2002 .

[26]  Francis T. Wu,et al.  A new insight on the geometry of subducting slabs in northern Luzon, Philippines , 2001 .

[27]  Jian Lin,et al.  Preferential mantle lithospheric extension under the South China margin , 2001 .

[28]  Liu Zhao-shu,et al.  A crustal structure profile across the northern continental margin of the South China Sea , 2001 .

[29]  Chi‐Yue Huang,et al.  Structural evolution from Paleogene extension to Latest Miocene-Recent arc-continent collision offshore Taiwan: comparison with on land geology , 2001 .

[30]  Pinxian Wang,et al.  Plio–Quaternary sedimentation processes and neotectonics of the northern continental margin of the South China Sea , 2001 .

[31]  X. M. Zhou,et al.  Origin of Late Mesozoic igneous rocks in Southeastern China: implications for lithosphere subduction and underplating of mafic magmas , 2000 .

[32]  T. Lüdmann,et al.  Neotectonic regime on the passive continental margin of the northern South China Sea , 1999 .

[33]  S. O’Reilly,et al.  Major and trace element, and Sr-Nd isotope constraints on the origin of Paleogene volcanism in South China prior to the South China Sea opening , 1997 .

[34]  Tsanyao Frank Yang,et al.  A double island arc between Taiwan and Luzon: consequence of ridge subduction , 1996 .

[35]  Walter H. F. Smith,et al.  New version of the generic mapping tools , 1995 .

[36]  X. Pichon,et al.  The Red River fault system in the Tonkin Gulf, Vietnam , 1995 .

[37]  Cheng-Hong Chen,et al.  Late Cenozoic basaltic volcanism around the Taiwan Strait, SE China: Product of lithosphere-asthenosphere interaction during continental extension , 1994 .

[38]  Paul Tapponnier,et al.  Updated interpretation of magnetic anomalies and seafloor spreading stages in the south China Sea: Implications for the Tertiary tectonics of Southeast Asia , 1993 .

[39]  Louis S. Teng.  Geotectonic evolution of late Cenozoic arc-continent collision in Taiwan , 1990 .

[40]  D. McKenzie,et al.  Extension and subsidence of the Pearl River Mouth Basin, northern South China Sea , 1989 .

[41]  John D. Pigott,et al.  Episodic Rifting and Subsidence in the South China Sea , 1986 .

[42]  M. Wiedicke,et al.  Mesozoic and Cainozoic rocks dredged from the South China Sea (Reed Bank area) and Sulu Sea and their significance for plate-tectonic reconstructions , 1986 .

[43]  L. Dehua,et al.  Some geochemical characteristics of basalts in the South China Sea , 1985 .

[44]  B. H. Chai.  Structure and tectonic evolution of Taiwan , 1972 .

[45]  Ivan Hernandez Almeida,et al.  South China Sea Tectonics. Opening of the South China Sea and its implications for southeast Asian tectonics, climates, and deep mantle processes since the late Mesozoic , 2014 .