黔南地区古生代正断层对构造特征的制约
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摘要
黔南地区发育东西向的古生代正断层以及南北向的中、新生代逆冲断层和褶皱。通过对地层、褶皱和断层的平面展布、野外地质调查以及地震剖面的解释,结合雪峰隆起的逆冲推覆特征,研究黔南地区古生代正断层对构造特征的制约作用。研究结果表明东西向的古生代正断层在中、新生代的构造变形过程中起构造转换带的作用。通过建立区内构造转换带的几何学模型,对地震线上的构造变形特征进行了解释。在构造转换带(正断层)附近,断层上盘逆冲推覆不明显;在远离断层处,逆冲断层和与断层相关的褶皱发育。随着距离断层面越来越远,构造转换带(正断层)下盘地层的逆冲推覆特征逐渐消失。
The east-west Paleozoic normal faults are well developed in South Guizhou,as well as the Mesozoic and Cenozoic of the north-south thrust faults and folds.According to the planar distribution of the strata,fold and fault,field observation and interpretation of seismic profiles,the constraints of Paleozoic normal faults on structural characteristics are studied,combined with the thrust of Xuefeng Uplift.The results show that the Paleozoic east-west normal faults took effect as the transfer zone during the process of Mesozoic and Cenozoic deformation.The structural characteristics of seismic section are interpreted by the geometry model of transfer zone established in this region.The fault displacement increases around the fault plane in the hanging wall of the transfer zone(normal fault).Conversely,the fault displacement decreases along the distance from fault plane in the footwall of transfer zone(normal fault) or vanish.
The east-west Paleozoic normal faults are well developed in South Guizhou,as well as the Mesozoic and Cenozoic of the north-south thrust faults and folds.According to the planar distribution of the strata,fold and fault,field observation and interpretation of seismic profiles,the constraints of Paleozoic normal faults on structural characteristics are studied,combined with the thrust of Xuefeng Uplift.The results show that the Paleozoic east-west normal faults took effect as the transfer zone during the process of Mesozoic and Cenozoic deformation.The structural characteristics of seismic section are interpreted by the geometry model of transfer zone established in this region.The fault displacement increases around the fault plane in the hanging wall of the transfer zone(normal fault).Conversely,the fault displacement decreases along the distance from fault plane in the footwall of transfer zone(normal fault) or vanish.
引文
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[3]Moustafa A R.Controls on the geometry of transfer zones in theSuez Rift and northwest Red Sea:Implications for the structuralgeometry of rift systems[J].AAPG Bulletin,2002,86(6):979-1002.
[4]Song T,Cawood P A.Structural styles in the Perth Basin associ-ated with the Mesozoic break-up of Greater India and Australia[J].Tectonophysics,2000,317(1-2):55-72.
[5]Younes A I,Mcclay K.Development of accommodation zones inthe gulf of Suez-Red Sea Rift,Egypt[J].AAPG Bulletin,2002,86(6):1003-1026.
[6]王纪祥,陈发景,李趁义.山东惠民凹陷伸展构造及调节带特征[J].现代地质,2003,17(2):203-209.
[7]汤良杰,郭彤楼,田海芹,等.黔中地区多期构造演化、差异变形与油气保存条件[J].地质学报,2008,82(3):298-307.
[8]陈科,林伟,王清晨.扬子地块东南缘多期构造变形及其油气意义[J].地质学报,2008,82(3):308-316.
[9]李仲东,罗志立,刘树根,等.雪峰推覆体掩覆的下组合(Z-S)油气资源预测[J].石油与天然气地质,2006,27(3):392-398.
[10]杨长清,岳全玲,曹波.黔中隆起及其周缘地区下古生界油气勘探前景与方向[J].现代地质,2008,22(4):558-566.
[11]湖南省地质矿产局.1∶20万区域地质测量报告书——溆浦幅[M].北京:地质出版社,1972.
[12]丘元禧.从梵净山“飞来峰”到兰田构造窗──对江南—雪峰推(滑)体的若干认识[J].安徽地质,1994,4(1-2):23-26.
[13]贵州省地质矿产局.贵州省区域地质志[M].北京:地质出版社,1987:608-616.
[14]丘元禧,张渝昌,马文璞.雪峰山的构造性质与演化:一个陆内造山带的形成与演化模式[M].北京:地质出版社,1999:49-133.
[15]颜丹平,汪新文,刘友元.川鄂湘边区褶皱构造样式及其成因机制分析[J].现代地质,2000,14(1):37-43.
[16]吴根耀,梁兴,叶舟.继承性构造与新生构造并存的时空发育特征及其油气勘探意义[J].现代地质,2008,22(5):765-778.
[17]贵州省地质矿产局.1∶20万区域地质测量报告书——都匀幅[M].北京:地质出版社,1964:240-251.
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