The South China Sea is not a mini-Atlantic: plate-edge rifting vs intra-plate rifting

Area of Science:

• Geology
• Marine Geosciences
• Plate Tectonics

Background:

• The South China Sea, a passive margin basin, has been compared to the Atlantic.
• Ocean drilling revealed the Iberian model is inapplicable to the South China Sea.

Purpose of the Study:

• To differentiate between plate-edge and intra-plate rift basins.
• To understand the South China Sea's origin and evolution within a broader tectonic context.

Main Methods:

• Review of various rifted basins.
• Comparative analysis of basin structures, formation, and lifespans.

Main Results:

• Two distinct rift basin types identified: plate-edge (e.g., South China Sea) and intra-plate (e.g., Atlantic).
• Plate-edge rifting, common in the Western Pacific during the mid-Cenozoic, contrasts with Mesozoic intra-plate rifting that formed large oceans.
• Significant differences in structure, formation, lifespan, and geographic scale exist between the two types.

Conclusions:

• The South China Sea represents a plate-edge rift basin, distinct from the Atlantic's intra-plate type.
• Its origin and evolution require study within the systematic context of Western Pacific marginal seas.