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Hyperextended crustal structure of the Qiongdongnan Basin and subsequent magmatic influence from the hainan mantle plume

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Science China Earth Sciences 2022年第5期65卷 845-862页

作者： Shaohong XIA Chaoyan FAN Dawei WANG Jinghe CAO Fang ZHAO Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Sanya Institute of Oceanology SCSIOSanya 572100China Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya 572000China

The Qiongdongnan Basin(QDNB)is a rift basin located in the extension direction of the oceanic ridge of the Northwest Subbasin of the South China *** basin is surrounded by Late Cenozoic Ocean Island Basalts(OIBs)magmatism associated with the putative hainan mantle ***,how the hainan mantle plume has affected the QDNB has not been studied in *** reveal the crustal structure of the QDNB and the possible influence of the hainan mantle plume,we conducted a wide-angle seismic exploration from hainan Island across the QDNB to the Xisha Block,and obtained the crustal structure by travel-time *** results show that the crustal stretching factors of the Northern and Southern Rises of the QDNB are estimated to be 1.3-2.0,indicating slight or moderate crustal ***,the crustal stretching factor in the Central Depression of the QDNB is estimated to be more than 3.0,which means that the crust has been *** by two detachment faults(F2 and F11),the upper and lower crust show brittle and ductile thinning,*** anomalous low-velocity conduits penetrating the crystalline crust are developed in the Songnan Uplift and the Southern Rise of the *** P-wave velocities are 5.5-6.0 km s^(−1),which are significantly lower than those of the surrounding crust(6.0-6.8 km s^(−1)).The Late Cenozoic magmatic intrusions(e.g.,sills and dikes)and hydrothermal activities can be observed in the sedimentary strata above these low-velocity *** interpret that the low-velocity conduits might be the crustal magmatic footprints of the hainan mantle plume,due to the correlated distributions of OIB-type magmatism,the magmatic intrusion patterns,the deep structure of the hainan mantle plume and the high heat flow of 95 mW m^(−2).Thus,we propose that the crustal structure of the QDNB is the product of crustal hyperextension in the rifting stage and subsequently affected by the hainan mantle plume *** study provide

关键词： Crustal structure Hyperextension Magmatism hainan mantle plume Qiongdongnan Basin

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Quaternary Intrusions from the Zhongjiannan Basin,South China Sea:Their Relationship with the hainan mantle plume and Influence on Hydrocarbon Reservoirs

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 376-392页

作者： HE Yanxin LIU Jianping WANG Lei TIAN Wei Key Laboratory of Orogenic Belts and Crustal Evolution MOESchool of Earth and Space SciencesPeking UniversityBeijing 100871China School of Petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China Guangzhou Marine Geological Survey Ministry of Natural ResourcesGuangzhou 510760China School of Marine Sciences Sun Yat-sen UniversityZhuhai 519000China

The transportation of magma in sedimentary basins often occurs through extensive dyke-sill *** role of sills on the plumbing system in rifted margins and the impact of sills on hydrocarbon reservoirs of prospective sedimentary basins has long been an area of great industrial interest and scientific *** on 2D seismic reflection,we present data on how the sills emplaced to form a magmatic plumbing system of the volcanic system for the Zhongjiannan Basin(ZJNB).The results show that sixty-nine sills and fourteen forced folds have been *** distribution and geometry of the sills suggest that magma flowed from west to east and then ascended to near the *** onlap relationship of the forced folds indicates that the timing of magmatic activities can be constrained at ca.0.2 *** spatial and temporal occurrences of intrusions imply that the strong post-rift magmatism in ZJNB was associated with the hainan mantle plume arising from the core-mantle ***,these forced folds could produce several types of hydrocarbon traps,due to accommodation through bending and uplift of the overlying rock and free surface,but it is critical to evaluate the effect of such emplacement when setting exploration targets.

关键词： sill intrusions forced fold petroleum traps hainan mantle plume Zhongjiannan basin

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Potassium-argon/argon-40-argon-39 geochronology of Cenozoic alkali basalts from the South China Sea

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Acta Oceanologica Sinica 2008年第6期27卷 115-123页

作者： YAN Quanshu SHI Xuefa YANG Yaomin WANG Kunshan Key laboratory of Marine Sedimentary and Environment Geology First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

Based on the isotopic chronologic results of Cenozoic alkali basalts from the South China Sea, the characteristics of volcanic activi- ty of the South China Sea after spreading were studied. The potassium - argon ages of eight alkali basalt samples from the South China Sea, and the argon - argon ages of two samples among them are reported. Apparent ages of the whole rock are 3.80 to 7. 91 Ma with an average value of 5.43 Ma （potassium- argon, whole rock）, and there is little difference among samples at the same location, e. g. , 4. 76 - 5.78 Ma for location S（M-12. The argon - argon ages for the two samples are 6.06 and 4. 71 Ma, which lie within the age scope of potassium - argon method. The dating results indicate that rock-forming age is from late Miocene to Pliocene, which is consistent with erupting event for alkali basalts from adjacent regions of the South China Sea. Volcanic activities occur after the cessation of spreading of the South China Sea, which are controlled by lithospheric fault and the spreading center formed during the spreading period of the South China Sea. These dating results, combined with geochemical characteristics of these basalts, the published chronological data for the South China Sea and its adjacent regions, and the updated geophysical data near hainan Island, suggest that after the cessation of spreading of the South China Sea, there occur widely distributing magmatic activities which primarily is alkali basalt, and the volcanic activity continues to Quaternary. The activity may be relative to hainan mantle plume originated from core/mantle boundary.

关键词： Cenozoic alkali basalt potassium- argon dating hainan mantle plume South China Sea

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