琼东南盆地半地堑特征及其动力学探讨
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摘要
利用琼东南盆地的反射地震剖面等资料,对其中具有代表性的崖北、北礁凹陷等半地堑的几何学、运动学特征进行分析,划分出旋转半地堑、滚动半地堑和多米诺式半地堑系3种类型,认为半地堑经历了中始新世-早渐新世、晚渐新世-早中新世两个演化阶段,并且在时间上有东早西晚,空间上有"东西分块、南北分带"的特征。在盆地半地堑组合特征及区域构造分析的基础上,指出盆地的发育与演化主要受古太平洋板块俯冲带后撤、红河断裂的左行走滑和南海海盆扩张的联合作用影响,表现为裂陷前期(Tg-T7)主要受古太平洋板块俯冲后撤及红河断裂的左行走滑联合作用,后期(T-T)主要受南海海盆海底扩张作用影响;而盆地张裂是通过纯剪切作用完成的。
The Qiongdongnan basin is a Tertiary extensional basin developed on the north margin of South China Sea,with a main structural style of half-grabens.Three types of half-grabens,which are rotational,rollover and rotational,have been identified after analyzing the geometry of the half-grabens from the seismic sections in the basin.The half-grabens mainly experienced two evolutionary stages,which were from middle Eocene to early Oligocene and from late Oligocene to early Miocene.Meanwhile,the half-graben's evolution featured differently in time and space:1) it took place earlier in the east than in the west,2) it developed with zonation in NS direction and segmention in EW direction.The tectonic history of the basin shows two stages of extension based on the integrated research of half-grabens and regional tectonic dynamics.The first stage of extension (Tg-T7) may be related to the rollback of the Paleo-Pacific subduction plate in Late Cretaceous and sinistral slip of the Red River fault zone in the Eocene,The second stage (T7-T6) is mainly controlled by the south-northward seafloor spreading from 32Ma to 17 Ma of South China Sea.In addition,symmetrical distribution of the half-grabens and crust structure indicated the stretching style of the basin is pure shear.
The Qiongdongnan basin is a Tertiary extensional basin developed on the north margin of South China Sea,with a main structural style of half-grabens.Three types of half-grabens,which are rotational,rollover and rotational,have been identified after analyzing the geometry of the half-grabens from the seismic sections in the basin.The half-grabens mainly experienced two evolutionary stages,which were from middle Eocene to early Oligocene and from late Oligocene to early Miocene.Meanwhile,the half-graben's evolution featured differently in time and space:1) it took place earlier in the east than in the west,2) it developed with zonation in NS direction and segmention in EW direction.The tectonic history of the basin shows two stages of extension based on the integrated research of half-grabens and regional tectonic dynamics.The first stage of extension (Tg-T7) may be related to the rollback of the Paleo-Pacific subduction plate in Late Cretaceous and sinistral slip of the Red River fault zone in the Eocene,The second stage (T7-T6) is mainly controlled by the south-northward seafloor spreading from 32Ma to 17 Ma of South China Sea.In addition,symmetrical distribution of the half-grabens and crust structure indicated the stretching style of the basin is pure shear.
引文
蔡周荣,夏斌,万志峰,刘维亮,张毅.2008.南海西部晚渐新世主要断裂活动特征及与红河断裂之关系.大地构造与成矿学,32(4):436-440.
戴俊生,陆克政,漆家福,陈书平.1998.渤海湾盆地早第三纪构造样式的演化.石油学报,19(4):16-20.
李绪宣,钟志洪,董伟良,孙珍,王良书,夏斌,张敏强.2006.琼东南盆地古近纪裂陷构造特征及其动力学机制.石油勘探与开发,33(6):713-721.
吕宝凤,袁亚娟.2008.南海北部深水盆地沉积-构造的差异性与红河断裂之关系.大地构造与成矿学,32(4):441-447.
茹克.1990.裂陷盆地的半地堑分析.中国海上油气(地质),4(6):1-10.
孙珍,钟志洪,周蒂,丘学林,吴世敏.2003.红河断裂带的新生代变形机制及莺歌海盆地的实验数据.热带海洋学报,22(2):1-9.
孙珍,周蒂,钟志洪,丘学林,曾佐勋.2005.莺-琼盆地基底控制断裂样式的模拟探讨.热带海洋学报,24(2):70-78.
吴世敏,丘学林,周蒂.2005a.南海西缘新生代沉积盆地形成动力学探讨.大地构造与成矿学,29(3):346-353.
吴世敏,杨恬,周蒂,丘学林,夏斌.2005b.南海南北共轭边缘伸展模型探讨.高校地质学报,11(1):105-110.
谢文彦,张一伟,孙珍,姜建群.2007.琼东南盆地断裂构造与成因机制.海洋地质与第四纪地质,27(1):71-78.
谢文彦,张一伟,孙珍,姜建群.2008.琼东南盆地新生代发育机制的模拟研究.地学前缘,15(2):232-241.
谢文彦,王涛,张一伟,姜建群.2009.琼东南盆地西南部新生代裂陷特征与岩浆活动机理.大地构造与成矿学,33(2):199-205.
于俊峰,段如泰.2008.琼东南盆地2号断裂东带发育特征及其形成机理.大地构造与成矿学,32(3):293-299.
袁玉松,杨树春,胡圣标,何丽娟.2008.琼东南盆地构造沉降史及其主控因素.地球物理学报,51(2):376-383.
张云帆,孙珍,周蒂,郭兴伟,施小斌,吴湘杰,庞雄.2007.南海北部陆缘新生代地壳减薄特征及其动力学意义.中国科学(D辑),37(12):1609-1616.
赵勇,戴俊生.2003.应用落差法分析研究生长断层.石油勘探与开发,30(3):13-15.
钟志洪,王良书,李绪宣,夏斌.2004.琼东南盆地古近纪沉积充填演化及其区域构造意义.海洋地质与第四纪地质,24(1):29-36.
钟志洪.2000.莺琼盆地构造形成与油气聚集的研究.南京大学博士论文.
周蒂,陈汉宗,吴世敏,俞何兴.2002.南海的右行陆缘裂解成因.地质学报,76(2):180-190.
朱丽,张会化,王江海,周江羽,解广轰.2006.金沙江-红河构造带北段囊谦盆地新生代高钾岩石40Ar/39Ar年代学研究.大地构造与成矿学,30(2):241-247.
Jackson J A and McKenzie D P.1983.The geometrical evolu-tion of normal fault system.Journal ofStructural Geology,5:471-482.
Leloup P H,Lasassin R,Tapponnier P H,Scharer U,Dalai Z,Xiaohan L,Liangshang Z,Shaocheng J and Trinh P T.1995.The Ailao Shan-Red river shear zone(Yunnan,Chi-na),Tertiary transform boundary of Indochina.Tectono-physics,251:3-84.
Schlische R W.1991.Half-graben basin filling models:Newconstraints on continental extensional development.BasinResearch,3:123-141.
Tapponnier P G,Peltzer Y,Dain L,Armijo R and Cobbold P.1982.Propagating extrusion tectonics in Asia:New insightfrom simple experiments with plasticine.Geology,10:611-616.
Tapponnier P H,Lasassin R,Leloup P H,Scharer U,Dalai Z,Haiwei W,Xiaohan L,Shaocheng J,Lianshang Z andJiayou Z.1990.The Ailao Shan-Red river shear metamor-phic belt,Tertiary left-lateral shear between Indochina andSouth China.Nature,343:431-437.
戴俊生,陆克政,漆家福,陈书平.1998.渤海湾盆地早第三纪构造样式的演化.石油学报,19(4):16-20.
李绪宣,钟志洪,董伟良,孙珍,王良书,夏斌,张敏强.2006.琼东南盆地古近纪裂陷构造特征及其动力学机制.石油勘探与开发,33(6):713-721.
吕宝凤,袁亚娟.2008.南海北部深水盆地沉积-构造的差异性与红河断裂之关系.大地构造与成矿学,32(4):441-447.
茹克.1990.裂陷盆地的半地堑分析.中国海上油气(地质),4(6):1-10.
孙珍,钟志洪,周蒂,丘学林,吴世敏.2003.红河断裂带的新生代变形机制及莺歌海盆地的实验数据.热带海洋学报,22(2):1-9.
孙珍,周蒂,钟志洪,丘学林,曾佐勋.2005.莺-琼盆地基底控制断裂样式的模拟探讨.热带海洋学报,24(2):70-78.
吴世敏,丘学林,周蒂.2005a.南海西缘新生代沉积盆地形成动力学探讨.大地构造与成矿学,29(3):346-353.
吴世敏,杨恬,周蒂,丘学林,夏斌.2005b.南海南北共轭边缘伸展模型探讨.高校地质学报,11(1):105-110.
谢文彦,张一伟,孙珍,姜建群.2007.琼东南盆地断裂构造与成因机制.海洋地质与第四纪地质,27(1):71-78.
谢文彦,张一伟,孙珍,姜建群.2008.琼东南盆地新生代发育机制的模拟研究.地学前缘,15(2):232-241.
谢文彦,王涛,张一伟,姜建群.2009.琼东南盆地西南部新生代裂陷特征与岩浆活动机理.大地构造与成矿学,33(2):199-205.
于俊峰,段如泰.2008.琼东南盆地2号断裂东带发育特征及其形成机理.大地构造与成矿学,32(3):293-299.
袁玉松,杨树春,胡圣标,何丽娟.2008.琼东南盆地构造沉降史及其主控因素.地球物理学报,51(2):376-383.
张云帆,孙珍,周蒂,郭兴伟,施小斌,吴湘杰,庞雄.2007.南海北部陆缘新生代地壳减薄特征及其动力学意义.中国科学(D辑),37(12):1609-1616.
赵勇,戴俊生.2003.应用落差法分析研究生长断层.石油勘探与开发,30(3):13-15.
钟志洪,王良书,李绪宣,夏斌.2004.琼东南盆地古近纪沉积充填演化及其区域构造意义.海洋地质与第四纪地质,24(1):29-36.
钟志洪.2000.莺琼盆地构造形成与油气聚集的研究.南京大学博士论文.
周蒂,陈汉宗,吴世敏,俞何兴.2002.南海的右行陆缘裂解成因.地质学报,76(2):180-190.
朱丽,张会化,王江海,周江羽,解广轰.2006.金沙江-红河构造带北段囊谦盆地新生代高钾岩石40Ar/39Ar年代学研究.大地构造与成矿学,30(2):241-247.
Jackson J A and McKenzie D P.1983.The geometrical evolu-tion of normal fault system.Journal ofStructural Geology,5:471-482.
Leloup P H,Lasassin R,Tapponnier P H,Scharer U,Dalai Z,Xiaohan L,Liangshang Z,Shaocheng J and Trinh P T.1995.The Ailao Shan-Red river shear zone(Yunnan,Chi-na),Tertiary transform boundary of Indochina.Tectono-physics,251:3-84.
Schlische R W.1991.Half-graben basin filling models:Newconstraints on continental extensional development.BasinResearch,3:123-141.
Tapponnier P G,Peltzer Y,Dain L,Armijo R and Cobbold P.1982.Propagating extrusion tectonics in Asia:New insightfrom simple experiments with plasticine.Geology,10:611-616.
Tapponnier P H,Lasassin R,Leloup P H,Scharer U,Dalai Z,Haiwei W,Xiaohan L,Shaocheng J,Lianshang Z andJiayou Z.1990.The Ailao Shan-Red river shear metamor-phic belt,Tertiary left-lateral shear between Indochina andSouth China.Nature,343:431-437.
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