Neogene igneous intrusions in the northern South China Sea: Evidence from high-resolution three dimensional seismic data |
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| Institution: | 1. Key Laboratory of Marine Geology & Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Center for Earth Systems Research and Sustainability, University of Hamburg, Hamburg D20146, Germany;3. School of Earth and Ocean Sciences, University of Victoria, Victoria V8P 5C2, Canada;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;3. College of Marine Science and Technology, China University of Geosciences (CUG), Wuhan, Hubei 430074, PR China;4. Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia, B2Y 4A2, Canada;5. Shenzhen Branch of CNOOC Ltd., Guangzhou 510240, China;6. Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China;1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2. Institute of Marine Geology and Resources, Ocean College, Zhejiang University, Zhoushan 316021, China;3. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;4. Guangzhou Marine Geological Survey, Guangzhou 510075, China;5. CNOOC Ltd., Beijing 100010, China |
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| Abstract: | Igneous intrusions emplaced within the prospective intervals of sedimentary basins can exert a significant impact on petroleum systems and hence are of considerable interest particularly when risking exploration plays. A number of discordant high amplitude seismic anomalies (DSAs) with a range of geometries are documented in high resolution 3D seismic data in the northern South China Sea. Their distribution and seismic characteristics are analysed and compared with similar seismic anomalies documented within sedimentary basins in the Atlantic margins and other locations. The DSAs occur mainly within Early Miocene strata and are interpreted as igneous intrusions that were emplaced close to the palaeo-seabed and are dated as early Middle Miocene using seismic-stratigraphic methods. A number of vents are also identified above the intrusions within early Middle Miocene strata. Several geometrical forms are observed, referred to here as saucer-shaped, lensoid-shaped, stacked and composite intrusions. The seismic expression of these is increasing complex towards the palaeo-seabed, with a tendency for the saucer-shaped sills to be the deepest intrusive forms. The igneous intrusions observed in this study only could be identified using 3D seismic data and they are important for the future evaluations of petroleum systems, basin evolution and tectonic analysis in the Pearl River Mouth Basin. |
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| Keywords: | Igneous intrusion Petroleum system Magmatic activity Basin evolution Pearl River Mouth Basin South China Sea |
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