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《Oil & Gas Geology》 1988-01
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THE DEVELOPMENT OF SUPERIMPOSED BASIN ON THE NORTHERN MARGIN OF THE SOUTH CHINA SEA AND ITS TECTONIC SIGNIFICANCE

Ru Ke Nan Hai West Oil Corporation  
Post mid-Cretaceous sedimantary basins developed on the northern marginof the South China Sea display unique characteristics in their spatial and tem-poral distribution. Three basin evolutionary cycles which started in Late Creta-ceous, Late Eocene and Middle Miocene respectively, have been recognized.Each of the cycles resulted from a seperate rifting episode. Interestingly,orien-tations of the major trends of the basins varied from predomenantly NE forthe first cycle through NE-EW for the second to EW-NW for the third. Conse-quently, the early configuration of an individual basin has been apparentlysuperimposed by the later events, resulting in a very complex pattern. Mechanical analysis suggests that the NE trending basins of the first cycle were probably the result of rifting along the extensional direction in a NWtensional terrane, whereas the NE-EW and EW-NW couples of the second andthird cycles can be best explained by extension along Riedel shear and tensionalcomponents under a sinistral divergent wrench regime whose azimuth has rotatedclockwise through time. Therefore, major changes in regional stress field areindicated. The tectonic setting related to the first basin cycle is inferred to be a intra-arc ard back-arc extensional domain induced by dip-steepenning of subductedoceanic slab when the convergence rate between Pacific and Eurasian Platesdecreased in Late Cretaceous. The collision of Indian Plate with Eurasian Plateabout 40 m.y. ago and the following penetration of the former into the laterled to the large left lateral motion along Red River Fault and the clockwiserotation of Indochina as Indochina block and South China block were extrudedsuccessively by the collision, thus initiating the second and third basin evolu-tionary cycles.
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