华北板块南缘石人山岩块晚古生代陆内变形特征及侧向挤出构造
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摘要
华北板块南缘在古生代时期经历了复杂的陆内变形过程。石人山岩块边界断裂发育大量平行于断裂带的A型褶皱和近水平的矿物生长线理,表明其经历了以走滑剪切变形为主的构造阶段。动力学研究表明石人山岩块具有南西向逆冲的运动学特征,其南侧洛南—栾川断裂带(洛栾断裂带)以左行剪切变形为主,北东侧鲁山断裂带以北西向逆冲兼有右行剪切变形为特征,夹于其中的石人山岩块显示为向西、向上挤出的特征。选择典型岩石样品进行同位素测年来限定断裂活动的时代,其中,洛栾断裂带内同构造花岗岩脉的锆石U-Pb定年结果为413.6±7.4 Ma,鲁山断裂带内走滑剪切特征明显的构造透镜体内变形岩石的锆石定年结果为419.3±11.2 Ma。虽然洛栾断裂与鲁山断裂的运动方向不同,但是同位素年代学研究限定了两条断裂带发生走滑变形的时间都是晚古生代泥盆纪末期,从而共同构成了石人山岩块整体向西挤出的构造特征,同时也表明,相互碰撞的大陆在碰撞之后将很快转变为以平行造山带侧向挤出与走滑位移为主的陆内变形演化阶段。
Objectives: The southern margin of the North China Block underwent complex intracontinental deformation during the Paleozoic. A-type folds parallel to the fault and near-horizontal mineral growth lineation developed in large numbers in the boundary faults of the Shirenshan block,which indicates that this block had undergone a tectonic stage dominated by strike-slip shear deformation.Methods: In this study,four cross sections were observed. We used geological mapping,key sections of the profile drawing,structural analysis and other conventional construction methods. We present new geochronological results,and document the emplacement Zircon U-Pb age of the sample.Results: Dynamics study shows that the Luoluan fault is characterized by NE subduction and left-lateral shear deformation,while the Lushan fault is characterized by NW thrust and right-lateral shear deformation,and that the Shirenshan block sandwiched therein displays features of being westward and upward extruding. Using typical rock samples for isotope dating to define the age of the fault activity,zircon U-Pb dating results of the syntectonic granite veins in the Luoluan fault are(413.6±7.4) Ma; and in the Lushan fault,inside the structural lentils with obvious strike-slip shear characteristics,zircon dating results of the veins are(419.3±11.2) Ma.Conclusions: Given that the movement directions of the Luoluan and Lushan faults are different, and that the isotope chronology study has pinpointed the time of the strike-slip deformation of the two faults to the end of the Late Paleozoic Devonian, the structural characteristics of the Shirenshan block being westward extruding is jointly constituted. This finding also suggests that continents after collision soon enter the evolution stage of intracontinental deformation which consists mainly of lateral extrusion and strike-slip displacement of orogenic belts.
Objectives: The southern margin of the North China Block underwent complex intracontinental deformation during the Paleozoic. A-type folds parallel to the fault and near-horizontal mineral growth lineation developed in large numbers in the boundary faults of the Shirenshan block,which indicates that this block had undergone a tectonic stage dominated by strike-slip shear deformation.Methods: In this study,four cross sections were observed. We used geological mapping,key sections of the profile drawing,structural analysis and other conventional construction methods. We present new geochronological results,and document the emplacement Zircon U-Pb age of the sample.Results: Dynamics study shows that the Luoluan fault is characterized by NE subduction and left-lateral shear deformation,while the Lushan fault is characterized by NW thrust and right-lateral shear deformation,and that the Shirenshan block sandwiched therein displays features of being westward and upward extruding. Using typical rock samples for isotope dating to define the age of the fault activity,zircon U-Pb dating results of the syntectonic granite veins in the Luoluan fault are(413.6±7.4) Ma; and in the Lushan fault,inside the structural lentils with obvious strike-slip shear characteristics,zircon dating results of the veins are(419.3±11.2) Ma.Conclusions: Given that the movement directions of the Luoluan and Lushan faults are different, and that the isotope chronology study has pinpointed the time of the strike-slip deformation of the two faults to the end of the Late Paleozoic Devonian, the structural characteristics of the Shirenshan block being westward extruding is jointly constituted. This finding also suggests that continents after collision soon enter the evolution stage of intracontinental deformation which consists mainly of lateral extrusion and strike-slip displacement of orogenic belts.
引文
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韩旭,任升莲,李龙明,李加好,葛粲,宋传中,林寿发,王静雅,李振强.2018.东秦岭卢氏地区奥陶系陶湾群的变质变形特征及形成环境分析.地质论评,64(2):378～391.
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任升莲,刘国厅,宋传中,李加好,杨帆,王静雅,王微,胡达.2016a.秦岭洛南—栾川断裂带角闪石的变质变形特征及其意义.岩石学报,32(3):775～786.
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宋传中,张国伟,牛漫兰,刘国生,霍立新.2006.秦岭造山带北缘的斜向碰撞与汇聚因子.中国地质,33(1):48～55.
宋传中,张国伟,任升莲,李加好,黄文成.2009.秦岭—大别造山带中几条重要构造带的特征及其意义.西北大学学报(自然科学版),39(3):368～380.
索书田,侯光久,魏启蒙,郑贵洲.1995.造山带内部的正花状构造.湖北地质,9(1):1～13.
唐辉明,潘别桐.1989.河南下汤地区温泉形成机制及其与车村—鲁山断裂的关系.地球科学,14(2):173～180.
涂文传,宋传中,任升莲,李加好,张欢.2013.北秦岭瓦穴子—乔端断裂带的构造特征及形成温度—压力条件探讨.地质论评,59(4):760～768.
王静雅,任升莲,宋传中,李加好,张妍,李龙明,刘国厅,王凯,胡达.2016.秦岭石人山南缘岩石变质变形分析及其构造意义.地质论评,62(4):870～880.
夏中广.2015.河南下汤温泉与车村—鲁山断裂的关系及电测深法在其勘查中的应用.物探与化探,39(1):95～99.
许志琴,卢一伦,汤耀庆.1990.中国的脊梁——秦岭山链的形成——聚合、碰撞及陆内俯冲.中国地质科学院院报,12(1):130～132.
袁学诚,徐明才,唐文榜,王庆海.1994.东秦岭陆壳反射地震剖面.地球物理学报,37(6):749～758.
张国伟,孟庆任,赖绍聪.1995.秦岭造山带的结构构造.中国科学(B辑),25(9):994～1003.
张国伟,郭安林,刘福田,孟庆任,肖庆辉.1996.秦岭造山带三维结构及其动力学分析.中国科学(D辑),26(增刊):1～6.
张国伟,董云鹏,姚安平.1997.秦岭造山带基本组成与结构及其构造演化.陕西地质,7(2):1～14.
张国伟,董云鹏,姚安平.2001.造山带与造山作用及其研究的新起点.西北地质,15(1):1～9.
Dong Yunpeng,Zhang Guowei,Franz Neubauer,Liu Xiaoming,Johann Genser,Christoph Hauzenberger.2011.Tectonic evolution of the Qinling orogen,China:Review and synthesis.Journal of Asian Earth Sciences,41(3):213～237.
Dong Yunpeng,Yang Zhao,Liu Xiaoming,Zhang Xiaoning,He Dengfeng,Li Wei,Zhang Feifei,Sun Shengsi,Zhang Hongfu,Zhang Guowei.2014.Neoproterozoic amalgamation of the northern Qinling terrain to the North China Craton:Constraints from geochronology and geochemistry of the Kuanping ophiolite.Precambrian Research,255:77～95.
Dong Yunpeng and Santosh M.2016.Tectonic architecture and multiple orogeny of the Qinling orogenic belt,central China.Gondwana Research,29(1):1～40.
Han Jiangtao,Liu Guoxing,Han Song,Gao Rui,Wang Haiyan,Liang Hongda.2016&.Electrical structure study on the Qinling orogenic belt and Weihe graben.Chinese Journal of Geology,51(1):76～85.
Han Xu,Ren Shenglian,Li Longming,Li Jiahao,Ge Can,Song Chuanzhong,Lin Shoufa,Wang Jingya,Li Zhenqiang.2018&.An analysis on Metamorphic and deformation characteristics and formation environment of the Ordovician Taowan Group in Lushi Area,Eastern Qinling Mountains.Geological Review,64(2):378～391.
Hu Da,Ren Shenglian,Song Chuanzhong,Li Jiahao,Zhang Yan,Lin Shoufa,Li Longming,Huang Peng,Liu Guoting.2015&.The analysis on metamorphic and deformation characteristics and formation environment of carbonate mylonite of Taowan Group in east Qinling.Geological Review,61(5):1079～1088.
Liu Yongsheng,Hu Zhaochu,Zong Keqing,Gao Changgui,Gao Shan,Xu Juan,Chen Haihong.2010.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS.Chinese Science Bulletin,55(15):1535～1546.
Pei Fang.1999&.The three major fractures in Pindingshan City and their influence on the minerals.Henan Geology,17(2):16～20.
Pei Xianzhi,Zhang Weiji,Wang Tao.1995&.Geological characteristics and tectonic evolution of the North Qinling orogenic belt.Northwestern Geology,16(4):8～12.
Ren Shenglian,Song Chuanzhong,Li Jiahao,Chen Zechao,Huang Wencheng,Zhang Haoran,Zhang Hua.2010&.Petromorphology of the Shiren Mountain block in the Qinling orogenic belt and its significance.Geology in China,37(2):347～356.
Ren Shenglian,Liu Guoting,Song Chuanzhong,Li Jiahao,Yang Fan,Wang Jingya,Wang Wei,Hu Da.2016a&.Deformation and metamorphic characteristics of amphiboles in the Luonan—Luanchuan fault belt of the Qinling Orogen and its significance.Acta Petrologica Sinica,32(3):775～786.
Ren Shenglian,Li Jiahao,Li Longming,Ge Can,Song Chuanzhong,Lin Shoufa,Liu Guoting,Sun Wenlong,Wang Jingya.2016b&.Luonan—Luanchuan fault belt(Luanchuan section)deformation and formation environment of characteristics.Chinese Journal of Geology,51(4):1074～1089.
Ren Shenglian,Song Chuanzhong,Li Jiahao.2016.Application of electron spin resonance (ESR) dating to ductile shearing:Examples from the Qinling orogenic belt,China.Journal of Structural Geology,85(2016):12～17.
Song Chuanzhong,Zhang Guowei,Niu Manlan,Liu Guosheng,Huo Lixin.2006&.Oblique collision and convergence factor on the northern margin of the Qinling orogenic belt.Geology in China,33(1):48～55.
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