Abstract
The Yinggehai Basin lies along the southeast extension of the Red River Fault Zone and is formed by SE slip and clockwise rotation of Indochina, driven by India-Eurasia collision. The Qiongdongnan Basin is a NE-trending Tertiary basin oriented oblique to the Yinggehai Basin, which extended in a SSE direction during opening of the South China Sea. Through analogue modeling of these NW-trending and NE-trending basins, we draw following conclusions: (1) Rifting in the Yinggehai Basin must have been earlier than in the Qiongdongnan Basin because the NE-trending structures in the Qiongdongnan Basin do not occur west of No. 1 Fault; (2) The deformation of the Qiongdongnan Basin is strongly affected by the deformation of the Yinggehai Basin. In the western Qiongdongnan Basin, a northern depression bounded by E-W-trending faults was formed by the interplay of NW-trending structures and NE-trending structures; (3) The relative initial rifting ages of the Qiongdongnan (similar to40 Ma), Yinggehai (similar to50 Ma) and Beibuwan (similar to60 Ma) Basins explain the differences in the structures that exist in their regions of overlap; (4) Initial rifting in the marginal basins of the South China Sea during the Late Cretaceous seems to be driven by retreat of the Pacific plate, but later clockwise movement of Indochina affected the NE-trending marginal basins of the South China Sea after the Eocene (similar to50 Ma).
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