太阳盆地中新生代断裂特征及成因机制
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摘要
太阳盆地位于北黄海盆地的东部,是一个发育在中-朝克拉通基底之上的中、新生代沉积盆地,勘探程度非常低。最新二维地震资料揭示,太阳盆地的断裂体系可以分控盆断裂、控凹(坳)断裂、控带断裂、控圈断裂和分割性断裂。盆地发育以NE向和NW向为主的的正断层和逆断层,而少量断层呈近EW或SN向。对不同类型的断裂构造特征及样式分析表明,断裂的活动期次可分为4期:晚侏罗世—早白垩世伸展断层、晚白垩世逆冲断层、始新世伸展正断层和新近纪正断层。中、新生代以来,中国东部构造演化主要受其东部太平洋板块活动控制,晚侏罗纪开始,洋壳俯冲在东部的欧亚大陆之下,伴随着太平洋—菲律宾板块的俯冲,太阳盆地发生NNE—SSW向的拉张;晚白垩世时期,由于太平洋板块俯冲方向的改变,区域性拉张变为区域性NNW—SSE向挤压,太阳盆地的一系列NW向逆断层形成;在始新世—渐新世,太平洋板块向东亚大陆作斜向减速俯冲,导致太阳盆地遭受NWW—SEE向拉张作用,再次断陷;渐新世末期,受喜山运动第Ⅱ幕的影响,太阳盆地发生再次的构造反转,形成一系列的小规模断层。
The sun basin is located in the east of the North Yellow Sea basin,a lowly explored Mesozoic-Cenozoic sedimentary basin,which is developed upon the base of China-Korea paraplatform.The latest 2D seismic data indicated that the fault system of the Sun basin can be divided into 5 types:basin-controlling faults,depression-controlling faults,belt-controlling faults,trap-controlling faults and segmentation faults,which dominantly trend northeast or northwest,and only a few faults trend north to west or north to south.The analyses on these faults indicate that the fault activities can be mainly divided into four stages:late Jurassic-early Cretaceous,late Cretaceous,Eocene and Neogene.Since Mesozoic and Cenozoic,the tectonic evolution of east China has mainly been controlled by the activities of the Pacific plate.In the late Jurassic,going with the subduction of the Pacific Ocean-Philippines Sea plate,the oceanic crust subducted under the Eurasia plate,and the Sun basin experienced NNE-SSW-trending extension under the background.In the early Cretaceous,due to the change of subduction direction of Pacific plate,the regional NNW-SSE extension turned to the regional NNW-SSE compression,and a series of NW-trending thrust faults were formed as a result.In the Eocene,the Sun basin had extension again,which was the result of the slowdown subduction of the Pacific plate towards East Asian mainland.At the end of Oligocene,influenced by Himalayan movement,the Sun basin became reversed again,and a series of small faults formed.
The sun basin is located in the east of the North Yellow Sea basin,a lowly explored Mesozoic-Cenozoic sedimentary basin,which is developed upon the base of China-Korea paraplatform.The latest 2D seismic data indicated that the fault system of the Sun basin can be divided into 5 types:basin-controlling faults,depression-controlling faults,belt-controlling faults,trap-controlling faults and segmentation faults,which dominantly trend northeast or northwest,and only a few faults trend north to west or north to south.The analyses on these faults indicate that the fault activities can be mainly divided into four stages:late Jurassic-early Cretaceous,late Cretaceous,Eocene and Neogene.Since Mesozoic and Cenozoic,the tectonic evolution of east China has mainly been controlled by the activities of the Pacific plate.In the late Jurassic,going with the subduction of the Pacific Ocean-Philippines Sea plate,the oceanic crust subducted under the Eurasia plate,and the Sun basin experienced NNE-SSW-trending extension under the background.In the early Cretaceous,due to the change of subduction direction of Pacific plate,the regional NNW-SSE extension turned to the regional NNW-SSE compression,and a series of NW-trending thrust faults were formed as a result.In the Eocene,the Sun basin had extension again,which was the result of the slowdown subduction of the Pacific plate towards East Asian mainland.At the end of Oligocene,influenced by Himalayan movement,the Sun basin became reversed again,and a series of small faults formed.
引文
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[3]Massoud MS,Scott A C,Killops S D,et a1.Oil source rockpotential of the lacustrine Jurassic Sim Uuju formation,West Korea Bay basin.Part I:Oil source rock correlation and envi-ronment of deposition[J].Journal of Petroleum Geology,1991,14(4):365-386.
[4]李文勇,李东旭,王后金.北黄海盆地构造几何学研究新进展[J].地质力学学报,2006,12(1):12-22.[LI Wen-yong,LI Dong-xu,WANG Hou-jin.Newprogress in the study of tec-tonic geometry of the North Yellow Sea basin[J].Journal of Geomechanics,2006,12(1):12-22.]
[5]李文勇,李东旭,夏斌,等.北黄海盆地构造演化特征分析[J].现代地质,2006,20(2):268-276.[LI Wen-yong,LI Dong-xu,XI A Bin,et al.Characteristics of structural evolution in north Yellow Sea Basin[J].Gesciences,2006,20(2):268-276.]
[6]李三忠,周立宏,刘建忠,等.华北板块东部新生代断裂构造特征与盆地成因[J].海洋地质与第四纪地质,2004,24(3):57-66.[LI San-zhong,ZHOU Li-hong,LI U Jian-zhong,et al.Cenozoic faulting and basin formation in the Eastern North China Plate[J].Marine Geology and Quaternary Geology,2004,24(3):57-66.]
[7]刘建忠,李三忠,周立宏,等.华北板块东部中生代构造变形与盆地格局[J].海洋地质与第四纪地质,2004,24(4):45-54.[LI UJian-zhong,LI San-zhong,ZHOU Li-hong,et al.Meso-zoic tectonics and basin distributionin the eastern North China Plate[J].Marine Geology and Quaternary Geology,2004,24(4):45-54.]
[8]李德生.中国含油气盆地构造学[M].北京:石油工业出版社,2002:15-29,503-518.[LI De-sheng.Tectonics of Oil&Gas-Bearing Basins in China[M].Beijing:Petroleum Industry Press,2002:15-29,503-518.]
[9]李廷栋,莫杰.黄海地质构造与油气资源[J].海洋地质动态,2002,18(11):4-7.[LI Ting-dong,MO Jie.Geological struc-tural and petroleum resource of the Yellow Sea[J].Marine Geology Letters,2002,18(11):4-7.]
[10]李乃胜.黄海三大盆地的构造演化[J].海洋与湖沼,1995,26(4):354-362.[LI Nai-sheng.Structural evolution of three basins in the Yellow Sea[J].Oceanologia et Limnologia Sini-ca,1995,26(4):354-362.]
[11]朱光,宋传中,王道轩,等.郯庐断裂带走滑时代的40Ar/39Ar年代学研究及其构造意义[J].中国科学D辑,2001,31(3):250-256.[ZHU Guang,SONG Chuan-zhong,WANG Dao-xuan,et al.Studies on40Ar/39Ar thermochronology of strike-sliptime of the Tan-Lufault zone andtheir tectonicim-plication[J].Science in China(Series D),2001,44(11):1002-1009.]
[12]朱光,王道轩,刘国生,等.郯庐断裂带的伸展活动及其动力学背景[J].地质科学,2001,36(3):269-278.[ZHU Guang,WANG Dao-xuan,LI U Guo-sheng,et al.Extrensional activ-ities along the Tan-Lu fault zone and its geodynamic setting[J].Chinese Journal of Geology,2001,36(3):269-278.]
[13]李思田,杨士恭,吴冲龙,等.中国东部及邻区中新生代裂陷作用的大地构造背景[C]//中国及邻区构造古地理和生物古地理.武汉:中国地质大学出版社,1990:109-126.[LI Si-tian,YANG Shi-gong,WUChong-long,et al.Geological Backgroundof Faultingin East China and Adjacent Regions in Mesozoic and Cenozoic Time[C]//Tectono-paleogeographic and Biopalaeogeog-raphyin China and adjacent regions.Wuhan:China University of Geosciences Press,1990:109-126.]
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