Igneous rocks in Jinghai Sag, Pearl River Mouth Basin and their geological significance

WANG Ruiliang; DONG Machao; PU Renhai; Wu Xiaochuan; XU Leyi

doi:10.16562/j.cnki.0256-1492.2018.02.010

Marine Geology & Quaternary Geology > 2018 > 38(2): 96-105. > DOI: 10.16562/j.cnki.0256-1492.2018.02.010

WANG Ruiliang, DONG Machao, PU Renhai, Wu Xiaochuan, XU Leyi. Igneous rocks in Jinghai Sag, Pearl River Mouth Basin and their geological significance[J]. Marine Geology & Quaternary Geology, 2018, 38(2): 96-105. DOI: 10.16562/j.cnki.0256-1492.2018.02.010

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Igneous rocks in Jinghai Sag, Pearl River Mouth Basin and their geological significance

1.
Guangzhou Institute, Shenzhen Branch, CNOOC Ltd, Shenzhen 440300, China
2.
Department of geology, Northwestern University, Xi'an 710069, China

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Received Date: May 18, 2016
Revised Date: July 27, 2016

Graphical Abstract

Abstract

Abstract

Igneous rocks in the Jinghai sag are identified through 3D seismic interpretation by the contact relationship between the rocks and the overlying deposits. Four magmatic stages are recognized in the study area, separated by three unconformity reflections, i.e the late Cretaceous Tm18, the late Miocene T35 (10.5Ma), the late Pliocene T20 (2.6Ma) and the overlying Quaternary. Among them the Quaternary eruption is the strongest. Volcanic and intrusive bodies are mainly distributed along the NE trending Chaoshannan fault, in a form of scatter small scale central volcanoes. The distribution trend of the volcanoes seems irrelevant to the increase in paleogeothermal gradient toward the oceanic crust in the south. Limited impact is expected to the oil gas accumulations in the sag.
- Jinghai sag,
- magma action,
- piercing,
- volcano,
- seismic reflection

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References (44)

References

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