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Pearl River Mouth basin
The Pearl River Mouth basin (PRMB) is an extensional sedimentary basin located in the northern part of the South China Sea. The basin covers an area of about 175,000 km2 where the Pearl River meets the South China Sea near Hong Kong.
==Tectonic setting (South China Sea)==
The Tectonics of the South China Sea are complex. The South China Sea is a marginal sea located where the Eurasian plate, the Indo-Australian plate, and the Philippine Sea plate intersect. Extension began in the Late Cretaceous, along the location of an existing arc. U-Pb dating of arc volcanics from Hong Kong dated the end of magmatic activity around 140 Ma. However, 40Ar/39Ar dating of granites located in the Pearl River Mouth basin showed some magmatic activity continued into the Paleocene. Sea floor spreading then began in the South China Sea around 32 Ma and lasted until around 16 Ma propagating in a southwest direction.
Although it is still unclear, two models have been proposed to explain the driving mechanism behind this extension.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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