南海南部陆缘构造变形特征及伸展作用:来自两条973多道地震测线的证据
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
973项目"南海大陆边缘动力学与油气资源潜力"在南海南部陆缘采集了两条多道地震剖面,其中NH973-1测线始于南海西南次海盆,横跨了整个南沙地区,至于婆罗洲西北侧,NH973-2测线位于礼乐滩东侧.对地震剖面的解释共划分出7个层序界面,地层可以划分为5个构造沉积单元.根据地震解释对不同时期断层的水平断距进行了测量及分析,获取了与脆性拉张相关的伸展信息:研究区的拉张作用可以分为两期,主要的拉张作用发生在大陆裂谷期(古近纪),形成了一系列的地堑-半地堑以及翘倾断块.第二期拉张作用的时期为漂移期(晚渐新世-早中新世),断层活动强度明显变弱,并主要集中在洋陆过渡带.在南海南部陆缘广泛发育了碳酸盐沉积,其发育的时代和南海的海底扩张时期一致.对位于礼乐滩东西两侧的两条地震剖面伸展特征的分析表明,其根据断层水平断距获得脆性伸展因子与根据深反射地震及重力反演获得的全地壳伸展因子之间存在差异,表明南海南部陆缘的拉张在纵向上并非是均一的,而是取决于深度发生变化.
Two recently acquired regional multi-channel seismic profiles across the southern margin,the South China Sea(SCS),are interpreted.One line is crossing the entire Nansha region from the deep oceanic Southwest Subbasin of the South China Sea,along the Nansha Islands to close to Borneo,and the other one runs east of the Reed Bank.Based on the interpretations of these profiles,we worked out stratigraphic sequences,tectonic structures and extension factors.Five tectonic-stratigraphic units are determined,together with 7 sequence boundaries.Detailed analyses on the extension factors based on the measurement of fault heaves reveal two episode of continent extension separated by a distinct unconformity,which likely correspond with the beginning of sea-floor spreading in the South China Sea.Early extension occurred during continental rifting(Late Cretaceous-Early Oligocene),and resulted in formation of half-grabens and rotated blocks controlled by a deeply rooted detachment system.Extension continued in our study area during the drifting phase of the Eastern Subbasin of the South China Sea(Late Oligocene-Early Miocene) until the subsequent opening of the Southwest Subbasin at about 25 Ma,but its intensity decreased markedly thereafter.Deeply rooted detachment systems evolved possibly during this second phase of extension at continent-ocean transition area.We suggest that a widespread carbonate platform developed across the Dangerous Grounds, concurrent with the drifting period of the Southwest Subbasin of the SCS.Fault-related stretching factors(β_f) to the west and east of Reed Bank are found to be comparable and show discrepancy with the whole crust stretching factors(β_c) in the study area as derived from gravity modeling.Thus we conclude that the continental crust of the southern margin might have experienced depth-dependent extension.
引文
[1]孙龙涛,孙珍,周蒂等.南沙海区礼乐盆地沉积地层与构造特征分析.大地构造与成矿学.2008,32(2):151-158 Sun L T,Sun Z,Zhou D,et al.Stratigraphic and structural characteristics of Lile Basin in Nnasha Area.Geotectonica et Metallogenia(in Chinese),2008,32(2):151-158
    [2]Hinz K,Schlueter H U.Geology of the Dangerous Grounds, South China Sea,and the continental margin off southwest Palawan:results of SONNE Cruises SO-23 and SO-27. Energy,1985,10(3/4):297-315
    [3]Kudrass H R,Wiedicke M,Cepek P,et al.Mesozoic and Cainozoic rocks dredged from the South China Sea(Reed Bank area) and Sulu Sea and their significance for platetectonic reconstructions.Marine and Petroleum Geology, 1986,3:19-30
    [4]Schlueter H U,Hinz K,Block M.Tectono-stratigraphic terranes and detachment faulting of the South China Sea and Sulu Sea.Marine Geology.1996,130:39-78
    [5]Hutchison C S.Marginal basin evolution:the southern South China Sea.Marine and Petroleum Geology,2004,21:1129- 1148
    [6]姚永坚,姜玉坤,曾祥辉.南沙海域新生代构造运动特征.中国海上油气(地质).2002,16(2):113-124 Yao Y J,Jiang Y K,Zeng H X,et al.Cenozoic tectonic movements in Nansha Area,South China Sea.China Offshore Oil and Gas(Geology)(in Chinese),2002,16 (2):113-124
    [7]Yan P,Liu H L.Tectonic-stratigraphic division and blind fold structures in Nansha waters,south china sea.Journal of Asian Earth Sciences,2004,24:337-348
    [8]姚衍桃,詹文欢.南海南部断裂的分形研究.海洋学报. 2007,29(2):59-66 Yao Y T,Zhan W H.Fractal analysis of faults in the southern part of the South China Sea.Acta Oceanologica Sinica(in Chinese),2007,29(2):59-66
    [9]吴世敏,周蒂,刘海龄.南沙地块构造格局及其演化特征.大地构造与成矿学.2004,28(1):23-28 Wu SM,ZhouD,Liu H L.Tectonicframeworkand evolutionary characteristics of Nansha Block,South China Sea.Geotectonica et Metallogenia(in Chinese).2004.28 (1):23-28.
    [10]Clift P,Lee G H,Duc N A,et al.Seismic reflection evidence for a Dangerous Grounds miniplate:No extrusion origin for the South China Sea.Tectonics,2008,27,TC3008,doi:10. 1029/2007TC002216
    [11]Cullen A,Reemst P,Henstra G,et al.Rifting of the South China Sea:new perspective.Petroleum Geoscience,2010, 16:273-282
    [12]周蒂,吴世敏,陈汉宗.南沙海区及邻区构造演化动力学的若干问题.大地构造与成矿学.2005,29(3):339-345 Zhou D,Wu S M,Chen H Z.Some remarks on the tectonic evolution of Nansha and its adjacent regions in southern South China Sea.Geotectonica et Metallogenia(in Chinese), 2005,29(3):339-345
    [13]姚伯初,刘振湖.南沙海域沉积盆地及油气资源分布.中国海上油气.2006,18(3):150-160 Yao B C,Liu Z H.Sedimentary basins and petroleum resources in Nansha offshore area,South China Sea(in Chinese).China Of fshore Oil and Gas(Geology),2006,18 (3):150-160.
    [14]孙龙涛,孙珍,詹文欢等.南沙海域礼乐盆地油气资源潜力.地球科学-中国地质大学学报.2010,35(1):137-145 Sun L T,Sun Z,Zhan W H.Petroleum potential prediction of the Lile Basin in Nansha.Earth Science-Journal of China University of Geosciences(in Chinese).2010,35(1):137- 145
    [15]姚永坚,吴能友,夏斌等.南海南部海域曾母盆地油气地质特征.中国地质.2008,35(3):503-513 Yao Y J,Wu N Y,Xia B,et al.Petroleum geology of the Zengmu Basin in the southern South China Sea.Geology in China(in Chinese),2008,35(3):503-513
    [16]刘振湖.南海南沙海域沉积盆地与油气分布.大地构造与成矿学.2005,29(3):410-417 Liu Z H.Distribution of sedimentary basins and petroleum potential in southern South China Sea.Geotectonica et Metallogenia(in Chinese),2005,29(3):410-417
    [17]Shipboard Scientific Party.Leg 184 Summary:Exploring the Asian Monsoon through Drilling in the South China Sea.In: Wang P,Prell W,Blum P.eds.Proc.ODP,Initial Results, TX:IODP,College Station,2000,1-77
    [18]Zhou D,Ru K,Chen H Z.Kinematics of Cenozoic extension on the South China Sea continental margin and its implications for the tectonic evolution of the region. Tectonophysics,1995,251:161-177
    [19]Zhou D,Yao B C.Tectonics and Sedimentary Basins of the South China Sea:Challenges and Progresses.Journal of Earth Science,2009,20(1):1-12
    [20]Taylor B,Hayes D E.Origin and history of the South China Sea basin.In:Hayes D E.ed.The tectonic and geologic evolution of the Southeast Asian Seas and Islands:Part 2. Washington D C:Geophys Monogr,AGU,1983,27:23- 56
    [21]Briais A,Patriat P,Tapponnier P.Updated Interpretation of Magnetic Anomalies an Seafloor Spreading Stages in the South China Sea:Implications for the Tertiary Tectonics of Southeast Asia.Journal of Geophysical Research,1993,98 (B4):6299-6328
    [22]Candes S C,Kent D V.Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic.Journal of Geophysical Research,1995,100(4): 6093-6095
    [23]Barckhausen U,Roeser H A.Seafloor spreading anomalies in South China Sea revisited.In:Clift,P ed.Continent-Ocean Interactions Within East Asian Marginal Seas,Geophys. Monogr.Ser.AGU,Washington,D C,2004,149:121- 125
    [24]Hsu S K,Yeh Y C,Doo W B,et al.New bathymetry and magnetic lineations identifications in the northernmost South China Sea and their tectonic implications.Marine Geophysical Research,25:29-44
    [25]姚伯初,曾维军,Hayes D E.中美合作调研南海地质专报. 1994,武汉:中国地质大学出版社,1-204 Yao B C,Zeng W J,Hayes D E.The Geological Memoir of South China Sea Surveyed by Jointly China & U.S.A(in Chinese).Wuhan:China University of Geosciences Press, 1994,1-204
    [26]Fuller M,Ali J R,Moss S J,et al.Paleomagnetism of Borneo.Journal of Asian Earth Sciences,1999,17:3-24
    [27]Hutchison C S.Geology of North-West Borneo:Sarawak, Brunei and Sabah.Amsterdam:Elsevier,2005,421
    [28]Sun Z,Zhong Z H,Keep M,et al.3D analogue modeling of the South China Sea:A discussion on breakup pattern. Journal of Asian Earth Sciences,2009,34:544 - 556
    [29]Hall R,Hattum M,Sparkman W.Impact of India-Asia collision on SE Asia:The record in Borneo.Tectonophysics, 2008,451:366-389
    [30]Hall R.Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific:computer-based reconstructions, model and animations.Journal of Asian Earth Sciences, 2002,20:353-431
    [31]Hamilton W.Tectonics of the Indonesian region.USGS Professional Paper,1979,1078:1-345
    [32]Hinz K,Fritsch J,Kempter E H K.Thrust tectonics along the continental margin of Sabah,Northwest Borneo. Geologische Rundschau,1989,78:705-730
    [33]Hazebroek H P,Tan D N K.Tertiary tectonic evolution of the NW Sabah continental margin.Bul Persat Geol Malays, 1993,33:195-210
    [34]Su D Q,White N,Mckenzie D.Extension and subsidence of the Pearl River Mouth Basin,northern South China Sea. Basin Research,1989,2:205-222
    [35]Clift P,Lin J.Preferential mantle lithospheric extension under the South China margin.Marine and Petroleum Geology,2001,18:929-944
    [36]Zhang Y F,Sun Z,Zhou D,et al.Stretching characteristics and its dynamic significance of the northern continental margin of South China Sea.Science in China(Series D-Earth Sciences),2008,51(3):422-430
    [37]Franke D,Barckhausen U,Heyde I,et al.Seismic images of a collision zone offshore NW Sabah/Borneo.Marine and Petroleum Geology,2008,25:606-624
    [38]Williams H H.Play concepts-northwest Palawan, Philippines.Journal of Asian Earth Sciences,1997,15:251- 273
    [39]Hayes D E,Nissen S S.The South China sea margins: Implications for rifting constrasts.Earth and Planetary Science Letters,2005,237:601-616
    [40]Franke D,Barckhausen U,Baristeas N,et al.The continent-ocean transition at the southestern margin of the South China Sea.Marine and Petroleum Geology,2011,28: 1187-1204
    [41]Sales A O,Jacobsen E C,Morado J A A,et al.he petroleum potential of deep-water northwest Palawan Block GSEC 66. Journal of AsianEarth Sciences.Journal of Asian Earth Sciences,1997,15:217-240
    [42]Wilson R C L,Whitmarsh R B,Froitzheim N,et al. Introduction;the land and sea approach.In-Wilson R C L, Whitmarsh R B,Taylor R B,et al.eds.Non-volcanic Rifting of Continental Margins:A comparison of Evidence from Land and Sea.London:Geological Society,Special Publications, 2001,187:1-8
    [43]MckenzieD.Some remarks on the development of sedimentary basins.Earth and Planetary Science Letters, 1978,40:25-32
    [44]Davis M,Kusznir N J.Depth-dependent lithopheric stretching at rifted continental margin.In:Karner G D,ed. Proceedings of NSF Rifted Margins,New York:Columbia University Press,2003,92-136
    [45]Holt R A.The gravity field of Sundaland-acquisition, assessment and interpretation.PhD Thesis,Birkbeck College and University College,University of London,1998
    [46]Chen Y,Niu F,Liu R,et al.Crustal structure beneath China from receiver function analysis.Journal of Geophysical Research, 2010,115,B03307,doi:10.1029/2009JB006386
    [47]郝天珧,刘建华,黄忠贤等.中国边缘海岩石层结构研究.地球物理学进展,2004,19(3):583-589 Hao T Y,Liu JH,Huang Z X,et al.Research on the lithosphere structure of Chinese Marginal Seas.Progess in Geophysics(in Chinese),2004,19(3):583-589
    [48]郝天珧,黄松,徐亚等.南海东北部及邻区深部结构的综合地球物理研究.地球物理学报.2008,51(6):1785- 1796. Hao T Y,Huang S,Xu Y,et al.Conprehensive geophysical research on the deep structure of Northeastern South China Sea.Chinese Journal of Geophysics(in Chinese).2008,51 (6):1785-1796
    [49]Braitenberg C,W ienecke S,Wang Y.Basement structures from satellite-derived gravity field:South China Sea ridge. Journal of Geophysical Research,2006,111;1-15
    [50]Wernick B.Low-angle normal faults in the Basin & Range Province:Nappe tectonics in an extending orogen.Nature, 1981,219(25):645-648
    [51]Lister G S,A E M,ASP.Detachment faulting and the evolution of passive margins.Geology,1986,14:246-250
    [52]Contrucci I,Matias L,Moulin M.Deep structure of the West African continental margin(Congo,Zaire,Angola), between 5 degrees S and 8 degrees S,from reflection/ refraction seismics and gravity data.Geophysical Journal International,2004,158:529-553
    [53]Driscoll N W,Karner G D.Lower crustal extension across the Northern Carnarvon basin,Australia:Evidence for an eastward dipping detachment.Journal of Geophysical Research,1998,103:4975-4991
    [54]Meredith D J,Egan S S.The geological and geodynamic evolution of the eastern Black Sea basin;insights from 2-D and 3-D tectonic modelling.Tectonophysics,2002,350:151- 179
    [55]Sibuet J C.New constraints on the formation of the nonvolcanic continental Galicia-Flemish Cap conjugate margins. London:Geological Society,1992,829-840
    [56]Watcharanantakul R,Morley C K.Evolution of magma-poor continental margins from rifting to seafloor spreading. Nature,2001,413:150-154
    [57]Ziegler P A.Comment on:Crustal thinning and subsidence in the North Sea.Nature,1983,304:561
    [58]Kusznir N J,Hunsdale R,Roberts A M,et al.Norwegian margin depth-dependent stretching.In:Dore A G,Vining B A,eds.Petroleum geology:Northwest Europe and global perspectives-Proceedings of the 6th Petroleum Geology Conference:Geological Society,London:Petroleum Geology Conferences Ltd,2005,767-783
    [59]Reston T J.Polyphase faulting during the development of the west Galicia rifted margin.Earth and Planetary Science Letters,2005,237:561-576
    [60]Reston T J.Extension discrepancy at North Atlantic nonvolcanic rifted margins:Depth-dependent stretching or unrecognized faulting? Geology,2009,35:367-370
    [61]Crosby A G,White N J,Edwards G R H,et al.Evolution of deep-water rifted margins:Testing depth-dependent extensional models.Tectonics,2011,30,TC1004,doi:10.1029/ 2010TC002687
    [62]Northrup C J,Royden L H,Brurchfiel B C.Motion of the Pacific plate relation to Eurasia and its potential relation to Cenozoic extension along the eastern margin of Eurasia. Geology,1995,23:719-722

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心