珠江口盆地深水区23.8 Ma构造事件地质响应及其形成机制

吴景富; 张功成; 王璞珺; 谢晓军; 胡圣标; 漆家福

doi:10.3799/dqkx.2012.075

Volume 37 Issue 4

Jul. 2012

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Article Navigation > Earth Science > 2012 > 37(4): 654-666

WU Jing-fu, ZHANG Gong-cheng, WANG Pu-jun, XIE Xiao-jun, HU Sheng-biao, QI Jia-fu, 2012. Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea. Earth Science, 37(4): 654-666. doi: 10.3799/dqkx.2012.075

Citation:

WU Jing-fu, ZHANG Gong-cheng, WANG Pu-jun, XIE Xiao-jun, HU Sheng-biao, QI Jia-fu, 2012. Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea. Earth Science, 37(4): 654-666. doi: 10.3799/dqkx.2012.075

Citation:

WU Jing-fu, ZHANG Gong-cheng, WANG Pu-jun, XIE Xiao-jun, HU Sheng-biao, QI Jia-fu, 2012. Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea. Earth Science, 37(4): 654-666. doi: 10.3799/dqkx.2012.075

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Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea

doi: 10.3799/dqkx.2012.075

1.
CNOOC Research Institute, Beijing 100027, China
2.
College of Earth Sciences, Jilin University, Changchun 130061, China
3.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
4.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 2011-11-20
Available Online: 2021-10-13
Publish Date: 2012-07-15

Abstract

Abstract

An important tectonic event and associated unconformity surface occurred in deepwater area of the Pearl River Mouth basin, South China Sea. Research results indicate: (1)The 23.8 Ma tectonic events is the convert face of Cenozoic tectonic evolution in Zhu Ⅱ depression of the basin, which divides the Paleogene syn-rifting stage and Neogene post-rifting stage. In the former, the basin-forming mechanisms are dominated by the stretching and strike-slip faults systems, however, in the later, faulting and geothermal effect (late in geothermal effect primarily) control the basin evolution. (2) The 23.8 Ma tectonic events resulted in great change in basin sedimentary filling. Through the analysis of trace elements and isotope, the sediment provenance comes from the southeast coastal granite materials before the 23.8 Ma, but from the east of the Qinghai-Tibet plateau and the Yunnan-Guizhou plateau after 23.8 Ma. At the same time, the slope-break surface jumps from south to north in the Baiyun depression, and sedimentary facies change also from shallow continental shelf to deepwater slop environments. (3) The 23.8 Ma tectonic events is a transferring surface of basin geothermal system. The quantitative restore of typical drilling thermal history shows geothermal gradient obviously changes at the 23.8 Ma. Through the thermal history inversion in deepwater area of the Pearl River Mouth basin, geothermal gradient rising process occur during the Paleogene, indicating the basin underwent extensional process, and the geothermal gradient falls clearly after 23.8 Ma, indicating the basin underwent a geothermal subsidence process. (4) The 23.8 Ma tectonic events reveals a great change in volcanic activity, the single ingredient of large basaltic magma eruption gradually strengthened before the 23.8 Ma, and the eruption gradually weakened after the surface. A dynamic model of the 23.8 Ma tectonic events is established. The mantle diapir from the asthenosphere flowing is regarded as the power source for the South China Sea spreading. The 23.8 Ma tectonic events resulted from the jumping of the South China Sea spreading and change in mantle diapir possibly related with the deep magma escaping.
- South China Sea,
- Pearl River Mouth basin,
- deepwater area,
- 23.8 Ma tectonic events,
- geochemistry,
- tectonics

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References(57)

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Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea

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