Characteristics of the Detrital Response to Oligocene/Miocene Geological Events in Baiyun Sag, Pearl River Mouth Basin

Abstract

Abstract:

The source areas changed obviously during Oligocene/Miocene in the northern South China Sea. With the pointcounting method of thin sections of Miocene Zhujiang Formation and Oligocene Zhuhai Formation in Baiyun Sag, Pearl River Mouth Basin, the characteristics of detrital components were studied in detail. The results show that: the lithic fragments in Zhuhai Formation were dominated by plutonic magmatic fragments, and there were also many feldspar and sedimentary lithic fragments, in agreement with the fact that the source was mainly from Mesozoic granite rock in the South China; in contrast, the lithic fragments were dominated by metamorphic fragments in Zhujiang Formation, and there were some magmatic fragments, sedimentary fragments and more feldspar, indicating more supply of the sources in Zhujiang Formation. With the various Oligocene/Miocene geological events, especially accompanied by weathering and increasing erosion caused by the uplift of QinghaiTibet Plateau, the source areas expanded within the ancient South China land and even to eastern Tibetan Plateau. The change of clastic components was the result of these various geological events.

Key words: geological event, detrital component, source area, Zhuhai Formation, Zhujiang Formation, Pearl River Mouth Basin

LI Yun-1, ZHENG Rong-Cai-1, GAO Bo-Yu-2, HU Xiao-Qiang-2, DAI Chao-Cheng-1. Characteristics of the Detrital Response to Oligocene/Miocene Geological Events in Baiyun Sag, Pearl River Mouth Basin[J]. Geoscience, 2011, 25(3): 476-481.

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