Abstract
AbstractThe global spatial distribution of the ridges and the oceanic basins is summarized in this paper, which are formed by propagating rifting and spreading. A new view of the tectonic evolution in the Southwestern Sub‐basin (SWSB), as well as the new evidence of the tectonic evolution, is suggested by comparing the origins, characteristics of spreading center, volcanism, and magnetic anomalies. The SWSB is a basin with a process of rifting and ridge propagation, formed at the same period with the Eastern Sub‐basin (ESB). Propagating spreading and its orientation were possibly controlled by the mushroom‐shaped low‐velocity mantle plume in the South China Sea (SCS), the Indo‐Sinian mantle plume or Hainan mantle plume. Therefore the simple evolution model is not appropriate for the formation of the SCS, and it should be an integration of many kinds of models. Mantle plume interaction should be taken into account when such a model is constructed.
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