The Pearl River Mouth basin is an extensional sedimentary basin covering about 175,000 square kilometers in the northern South China Sea, near where the Pearl River meets the sea close to Hong Kong. It formed through continental rifting beginning in the Late Cretaceous, followed by seafloor spreading between roughly 32 and 16 million years ago, and its structure holds two depressed areas between three uplift zones running parallel to the spreading axis. The basin is rich in hydrocarbons, particularly in its Baiyun sag, drawing on Eocene age source rock formations within the basin.
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