晋北地区口泉断裂带晚中生代分段构造特征
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摘要
口泉断裂带位于华北克拉通中部造山带的西侧,晚中生代具有独特的逆冲构造样式和复杂的构造演化过程。以区域地质调查资料为基础,通过野外地质考察、构造建模及磷灰石裂变径迹分析,研究了口泉断裂带晚中生代的分段构造特征及其形成机制。结果显示:(1)口泉断裂带自东南向西北逆冲推覆,沿断裂带走向的位移活动具南强北弱特点;上盘为太古宇片麻岩,下盘地层依次为寒武系—奥陶系、石炭系—二叠系及侏罗系。(2)口泉断裂带具有分段特点,主体构造样式为非典型的构造三角带,具有两套以上的滑脱层;底滑脱层自南向北从太古宇、寒武系—奥陶系升高至石炭系,被动顶板滑脱层则位于下寒武统馒头组—毛庄组或下伏的太古宇片麻岩。(3)据磷灰石裂变径迹测试模拟,口泉断裂带逆冲活动的最早年龄是(147. 1±6. 0) Ma,为晚侏罗世,其形成机制与晚侏罗世伊泽奈崎板块俯冲造成的NW向挤压大地构造背景有关。
Kouquan Fault Zone is located in the western part of the Trans-North China Orogen,North China Craton,and shows a unique thrusting style and complex Late Mesozoic structural evolution. This study focuses on the Late Mesozoic structural segmentation and mechanism,based on field observation,structural modeling and apatite fission track dating. The results show that:( 1) Kouquan Fault Zone nappe thrusted from southeast to northwest,and the displacement is stronger in the south than in the north of the fault zone. The hanging-wall comprises Archaean gneiss,while the footwall comprises Cambro-Ordovician,Permo-Carboniferous and Jurassic sequences.( 2) Kouquan Fault Zone is featured by segmentation and the main structural style is a typical triangular zone with over two sets of décollement sequences. The lower décollement sequence is Archaean,CambroOrdovician and Carboniferous,but the upper décollement sequence is the Lower Cambrian Mantou-Maozhuang Group or the underlying Archaean gneiss.( 3) The formation of Kouquan Fault Zone may be associated with the NW-directed compression led by the Late Jurassic subduction of the Izanagi plate. Apatite fission-track simulation suggests that the earliest thrusting of Kouquan Fault Zone occurred in the Late Jurassic to Early Cretaceous( 147. 1 ± 6. 0 Ma).
Kouquan Fault Zone is located in the western part of the Trans-North China Orogen,North China Craton,and shows a unique thrusting style and complex Late Mesozoic structural evolution. This study focuses on the Late Mesozoic structural segmentation and mechanism,based on field observation,structural modeling and apatite fission track dating. The results show that:( 1) Kouquan Fault Zone nappe thrusted from southeast to northwest,and the displacement is stronger in the south than in the north of the fault zone. The hanging-wall comprises Archaean gneiss,while the footwall comprises Cambro-Ordovician,Permo-Carboniferous and Jurassic sequences.( 2) Kouquan Fault Zone is featured by segmentation and the main structural style is a typical triangular zone with over two sets of décollement sequences. The lower décollement sequence is Archaean,CambroOrdovician and Carboniferous,but the upper décollement sequence is the Lower Cambrian Mantou-Maozhuang Group or the underlying Archaean gneiss.( 3) The formation of Kouquan Fault Zone may be associated with the NW-directed compression led by the Late Jurassic subduction of the Izanagi plate. Apatite fission-track simulation suggests that the earliest thrusting of Kouquan Fault Zone occurred in the Late Jurassic to Early Cretaceous( 147. 1 ± 6. 0 Ma).
引文
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[17]张兆琪.山西大同口泉山隆升-挠褶构造研究[J].地质调查与研究,2008,31(4):291-296.
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[21]MARUYAMA S,ISOZAKI Y,KIMURA G,et al. Paleogeographic maps of the Japanese Islands:plate tectonic synthesis from 750 Ma to the present[J]. Island Arc,1997,6:121-142.
[22]张岳桥,董树文,赵越,等.华北侏罗纪大地构造:综评与新认识[J].地质学报,2007,81(11):1462-1480.
[23]李曙光.大别山超高压变质岩折返机制与华北—华南陆块碰撞过程[J].地学前缘,2004,11(3):63-69.
[24]山西地质矿产局.山西省区域地质志[M].北京:地质出版社,1989:608-609.
[25]王娜.构造体系对大同煤田的控煤作用初探[J].科学之友,2006(1):69-87.
[26]袁远,曹代勇,林中月,等.大同煤田构造控煤特征研究[J].中国煤炭地质,2011,23(8):63-65.
[27]GORDY P L,FREY F R. Structural cross sections through the foothills west of Calgary[M]//EVERS H J,THORPE J E.Geology of the Foothills Between Savanna Creek and Panther River,Southwestern Alberta,Canada. Vancouver:Canadian Society of Petroleum Geologists and Canadian Society of Exploration Geophysicists,1975:37-64.
[28]COUZENS B A,WILTSCHKO D V. The control of mechanical stratigraphy on Formation of triangle zones[J]. Bulletin of Canadian Petroleum Geology,1996,44(2):165-179.
[29]朱日祥,陈凌,吴福元,等.华北克拉通破坏的时间、范围与机制[J].中国科学(地球科学),2011,41(5):583-592.
[30]朱文斌,万景林,舒良树,等.裂变径迹定年技术在构造演化研究中的应用[J].高校地质学报,2005,11(4):593-600.
[31]邱楠生,汪集旸,梅庆华,等.(U-Th)/He年龄约束下的塔里木盆地早古生代构造-热演[J].中国科学(D辑),2010,40(12):1669-1683.
[32]刘武生,秦明宽,漆富成,等.运用磷灰石裂变径迹分析鄂尔多斯盆地周缘中新生代沉降隆升史[J].铀矿地质,2008,24(4):221-232.
[2]王钟堂.山西大同煤田地层及构造[J].地质论评,1957,17(1):64-77.
[3]王钟堂.山西含煤地区的构造特征[J].地质学报,1965,45(1):30-41.
[4]潘广.山西大同煤田的大构造[J].科学通报,1957,8(20):633.
[5]潘广.对大同煤田区域构造的新认识[J].地质论评,1958,18(3):181-191.
[6]杜丕.大同煤田区域构造特征及与邻区构造关系[J].地质论评,1964,22(4):259-266.
[7]陈庸勋,戴东林.山西省大同地区侏罗系的沉积相[J].地质学报,1962,42(3):321-332.
[8]李兴唐.华北断块区前震旦纪断块的形成与断裂系统[M].北京:科学出版社,1980:73-82.
[9]赵明鹏,LTGE H.山西口泉断裂与大同侏罗纪煤田的关系[J].华北地质矿产杂志,1996,11(1):93-98.
[10]丁梦林.全国“断裂构造”学术讨论会在山西大同召开[J].地震地质,1984,6(1):150.
[11]刘光勋,李方全,李桂荣.我国滇西北地震活动区的活动构造与应力状态[J].地震地质,1986,8(1):1-14.
[12]李树屏,郑仲科.鹅毛口推覆构造和逆掩断层剖析[J].构造地质论丛,1986(6):52-62.
[13]邓起东,唐汉罩,王克鲁,等.山西隆起区断陷地震带地震地质条件及地震发展趋势概述[J].地质科学,1973,8(1):37-47.
[14]刘成第,朱道尊.鹅毛口逆掩断层与推覆体[J].构造地质论丛,1986(6):63-70.
[15]王桂梁,姜波,余志伟.逆冲断层前锋带的构造样式[J].地质科技情报,1994,13(3):10-17.
[16]赵祯祥,杜晋锋.晋东北地区燕山运动的基本特征——来自1∶25万应县幅区域地质调查的总结[J].地质力学学报,2007,13(2):150-162.
[17]张兆琪.山西大同口泉山隆升-挠褶构造研究[J].地质调查与研究,2008,31(4):291-296.
[18]赵国春,孙敏,WILDE S A.华北克拉通基底构造单元特征及早元古代拼合[J].中国科学(D辑),2002,32(7):538-549.
[19]莫虎岑.晋北并非晚古生代沉积边缘[J].地质论评,1985,31(1):79-82.
[20]岑敏,董树文,施炜,等.大同盆地形成机制的构造研究[J].地质论评,2015,61(6):1235-1247.
[21]MARUYAMA S,ISOZAKI Y,KIMURA G,et al. Paleogeographic maps of the Japanese Islands:plate tectonic synthesis from 750 Ma to the present[J]. Island Arc,1997,6:121-142.
[22]张岳桥,董树文,赵越,等.华北侏罗纪大地构造:综评与新认识[J].地质学报,2007,81(11):1462-1480.
[23]李曙光.大别山超高压变质岩折返机制与华北—华南陆块碰撞过程[J].地学前缘,2004,11(3):63-69.
[24]山西地质矿产局.山西省区域地质志[M].北京:地质出版社,1989:608-609.
[25]王娜.构造体系对大同煤田的控煤作用初探[J].科学之友,2006(1):69-87.
[26]袁远,曹代勇,林中月,等.大同煤田构造控煤特征研究[J].中国煤炭地质,2011,23(8):63-65.
[27]GORDY P L,FREY F R. Structural cross sections through the foothills west of Calgary[M]//EVERS H J,THORPE J E.Geology of the Foothills Between Savanna Creek and Panther River,Southwestern Alberta,Canada. Vancouver:Canadian Society of Petroleum Geologists and Canadian Society of Exploration Geophysicists,1975:37-64.
[28]COUZENS B A,WILTSCHKO D V. The control of mechanical stratigraphy on Formation of triangle zones[J]. Bulletin of Canadian Petroleum Geology,1996,44(2):165-179.
[29]朱日祥,陈凌,吴福元,等.华北克拉通破坏的时间、范围与机制[J].中国科学(地球科学),2011,41(5):583-592.
[30]朱文斌,万景林,舒良树,等.裂变径迹定年技术在构造演化研究中的应用[J].高校地质学报,2005,11(4):593-600.
[31]邱楠生,汪集旸,梅庆华,等.(U-Th)/He年龄约束下的塔里木盆地早古生代构造-热演[J].中国科学(D辑),2010,40(12):1669-1683.
[32]刘武生,秦明宽,漆富成,等.运用磷灰石裂变径迹分析鄂尔多斯盆地周缘中新生代沉降隆升史[J].铀矿地质,2008,24(4):221-232.