东秦岭-大别造山带北侧中新生代差异构造变形
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摘要
受多期非均衡造山作用以及多构造体制的叠加,东秦岭-大别造山带北侧中新生代发生差异构造变形。基于区域构造动力学机制,将中新生代构造变形分为4个期次:印支期(T2-T3)、早燕山期(J1)、中燕山期(J2-K1)和晚燕山-早喜马拉雅期(K2-E)。通过野外地质剖面和地震剖面的构造解析,认为印支期-中燕山期主体变形方式为逆冲推覆作用,变形强度自东向西发生时空迁移;晚燕山-早喜马拉雅期为关键构造变革期,发生区域伸展变形,且以信阳-合肥盆地和灵宝-鲁山-确山-固始-肥东断裂一带伸展作用最强。平衡剖面恢复显示,印支期和中燕山期为东秦岭-大别造山带北侧两期主要逆冲推覆构造发育期,其中印支期强烈的逆冲推覆作用发生于商城-潢川一带以东,而中燕山期则发生于商城-潢川一带以西。中燕山晚期(K1),受差异造山作用,研究区东西构造变形分异,东秦岭北侧发生强烈收缩变形,而大别北侧则在热隆作用下发生滑覆。
Because of the multiphasic unbalanced orogeny and superimpose of multiple tectonic system,there is Meso-Cenozoic differential deformation in the northern East Qinling-Dabie orogenic belt. Based on the difference in geodynamic mechanism, the Meso-Cenozoic tectonic deformation in the northern East Qinling-Dabie Orogenic Belt could be divided into four epochs including Indosinian (T2-T3), Early Yanshanian (J1), Middle Yanshanian (J2-K1), Late Yanshanian -Early Himalayaian (K2-E). Structural analysis of two petrofabric sections and three seismic ones show that the tectonic deformation mode was thrusting from Indosinian to Middle Yanshanian, and the deformation strength had a feature of space-time migration from east to west. Late Yanshanian-Early Himalayaian was the key tectonic transform epoch in which the deformation was extensional,and the strongest extensional deformation happened in Xinyang-Hefei basin and the area along the Lingbao-Lushan-Queshan-Gushi-Feidong fault. And in order to understand the deformation strength from space-time, three balance cross-section were finished. The data display that Indosinian and Middle Yanshanian are the major epochs of thrusting in the northern East Qinling-Dabie orogenic belt. The intense thrusting lied in the east of the Shangcheng-Huangchuan area in Indosinian, and west in Middle Yanshanian. Because of the varying orogeny, the tectonic deformation was differential from the east to west of the study region in late Middle Yanshanian(K1). The deformation was thrusting in the northern East Qinling orogenic belt, and slumped overthrusting in the northern Dabie owing to thermal doming.
Because of the multiphasic unbalanced orogeny and superimpose of multiple tectonic system,there is Meso-Cenozoic differential deformation in the northern East Qinling-Dabie orogenic belt. Based on the difference in geodynamic mechanism, the Meso-Cenozoic tectonic deformation in the northern East Qinling-Dabie Orogenic Belt could be divided into four epochs including Indosinian (T2-T3), Early Yanshanian (J1), Middle Yanshanian (J2-K1), Late Yanshanian -Early Himalayaian (K2-E). Structural analysis of two petrofabric sections and three seismic ones show that the tectonic deformation mode was thrusting from Indosinian to Middle Yanshanian, and the deformation strength had a feature of space-time migration from east to west. Late Yanshanian-Early Himalayaian was the key tectonic transform epoch in which the deformation was extensional,and the strongest extensional deformation happened in Xinyang-Hefei basin and the area along the Lingbao-Lushan-Queshan-Gushi-Feidong fault. And in order to understand the deformation strength from space-time, three balance cross-section were finished. The data display that Indosinian and Middle Yanshanian are the major epochs of thrusting in the northern East Qinling-Dabie orogenic belt. The intense thrusting lied in the east of the Shangcheng-Huangchuan area in Indosinian, and west in Middle Yanshanian. Because of the varying orogeny, the tectonic deformation was differential from the east to west of the study region in late Middle Yanshanian(K1). The deformation was thrusting in the northern East Qinling orogenic belt, and slumped overthrusting in the northern Dabie owing to thermal doming.
引文
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金昕,任光辉,曾建华,黄建刚,张治川,陈浮,杨毅,周友松,梁恕信.1996.东秦岭造山带岩石圈热结构及断面模型.中国科学(D辑),26(S1):13-22.
李创举,包志伟.2010.河南舞阳南部张士英岩体的地球化学与成因及其构造意义.大地构造与成矿学,34(3):435-443.
李思田,路凤香,林畅松.1997.中国东部及邻区中、新生代盆地演化及地球动力学背景.武汉:中国地质大学出版社:239.
李忠,李任伟,孙枢.2002.大别山中生代构造演化:来自盆地充填记录的启示.地质通报,31(8-9):547-553.
李忠,孙枢,李任伟,江茂生.2000.合肥盆地中生代充填序列及其对大别山造山作用的指示.中国科学(D辑),30(3):256-263.
刘光祥,黄泽光,高长林.2007.中国东部中央造山带两侧盆地与油气.北京:石油工业出版社:85-120.
刘国生,朱光,牛漫兰,宋传中,王道轩.2006.合肥盆地东部中-新生代的演化及其对郯庐断裂带活动的响应.地质科学,41(2):256-269.
刘少峰,张国伟.2008.东秦岭-大别山及邻区盆-山系统演化与动力学.地质通报,27(12):1943-1959.
柳忠泉.2009.北淮阳构造带可燃天然气的发现与合肥盆地油气远景分析.地质学报,83(4):478-486.
孟庆任,李任伟,李双应.2005.中生代合肥盆地南部的沉积过程与大别山变质地体的剥露.岩石学报,21(4):1145-1156.
尚冠雄.1997.华北地台晚古生代煤田地质学研究.太原:山西科学技术出版社:294-30.
石铨曾.2004.河南省东秦岭山脉北缘的推覆构造及伸展拆离构造.北京:科学出版社:115-248.
宋传中,刘国生,牛漫兰,王道轩,朱光.2002.秦岭-大别造山带北缘新生代的构造特征及动力学探讨.地质通报,21(8-9):530-535.
宋传中,任升莲,李加好,陈泽超,连芸,蔡志川.2009.华北板块南缘的变形分解:洛南-栾川断裂带与秦岭北缘强变形带研究.地学前缘,16(3):181-189.
孙晓猛,吴根耀,郝福江,张梅生,刘鹏举.2004.秦岭-大别造山带北部中新生代逆冲推覆构造期次及时空迁移规律.地质科学,39(1):63-70.
王亚琳,杨贵丽,徐春华.2007.合肥侏罗纪盆地性质及其与大别造山带沉积响应.石油实验地质,29(1):57-62.
吴智平,侯旭波,李伟.2007.华北东部地区中生代盆地格局及演化过程探讨.大地构造与成矿学,31(4):385-399.
解东宁,何明喜,周立发,谢其峰.2006.东秦岭-大别造山带北缘逆冲推覆构造特征及油气前景.石油与天然气地质,27(1):48-55.
许长海,周祖翼,马昌前.2001.大别造山带140～85Ma热窿伸展作用———年代学约束.中国科学(D辑),31(11):925-937.
许长海,周祖翼,P Van Den Haute,J L Mansy,杨风丽.2006.合肥盆地构造演化的磷灰石裂变径迹分析.石油学报,27(6):5-13.
许志琴,曾令森,梁凤华,戚学祥.2005.大陆板片多重性俯冲与折返的动力学模式———苏鲁高压-超高压变质地体的折返年龄限定.岩石矿物学杂志,24(5):357-368.
徐宏节,黄泽光.2007.南华北中南部中新生代盆地演化与油气成藏分析.石油实验地质,29(6):541-543.
杨坤光,马昌前,许长海,杨巍然.1999.北淮阳构造带与大别造山带的差异性隆升.中国科学(D辑),29(2):97-103.
杨巍然,王国灿,简平.2000.大别造山带构造年代学.武汉:中国地质大学出版社:68-112.
易万霞,赵宗举,李学田,沈金龙,周进高.2003.早白垩世合肥盆地性质及含油气性分析.大地构造与成矿学,27(1):64-71.
张国伟,孟庆任,于在平,孙勇,周鼎武,郭安林.1996.秦岭造山带的造山过程及其动力学特征.中国科学(D辑),26(3):193-200.
张国伟,张本仁,袁学诚,肖庆辉.2001.秦岭造山带与大陆动力学.北京:地质出版社:117-420.
赵文智,张光亚,王红军,王社教,汪泽成.2003.中国叠合含油气盆地石油地质基本特征与研究方法.石油勘探与开发,30(2):1-8.
赵越,杨振宇,马醒华.1994.东亚大地构造发展的重要转折.地质科学,29(2):105-115.
周小进.2010.南华北上古生界油气成藏关键条件分析.石油实验地质,32(5):420-427.
朱清波,杨坤光,王艳.2010.庐山变质核杂岩伸展拆离和岩浆作用的年代学约束.大地构造与成矿学,34(3):391-401.
Dong Y P,Zhang G W,Franz N,Liu X M,Johann G andChristoph H.2011.Tectonic evolution of the Qinling oro-gen,China:Review and synthesis.Journal of Asian EarthSciences,41:213–237.
Grimmer J C,Ratschbacher L,Mc Williams M,Franz L,GaitzschI,Tichomirowa M,Hacker B R and Zhang Y.2003.Whendid the uhtrahigh-pressure rocks reach the surface?A207Pb/206Pb zircon,40Ar/39Ar while mica,Si-in-white mica,single-grain provenance study of Dabie Shan synorogenicforeland sediments.Chem Geol,197(1):87-110
Li R W,Wan Y S,Cheng Z Y,Zhou J X,Li S Y,Jin F Q,Meng Q R,Li Z and Jiang M S.2005.Provenance of Ju-rassic sediments in the Hefei Basin,east-central China andthe contribution of high-pressure and ultrahigh-pressuremetamorphic rocks from the Dabie Shan.Earth and Plane-tary Science Letters,231:279-294.
Li S G,Jagoutz E,Xiao Y L,Ge N J and Chen Y Z.1996.Chronology of ultrahigh-pressure metamorphism in the Da-bie Mountains and Su-Lu terrane:Ⅰ.Sm-Nd isotope sys-tem.Science in China(Series D),39(6):587-608.
Li S Z,Timothy M K,Liu X C,Zhang G W,Zhao G C,WangL and Wang Y J.2009.Two-stage collision-related extru-sion of the western Dabie HP-UHP metamorphic terranes,central China:Evidence from quartz c-axis fabrics andstructures.Gondwana Researc,16:294-309.
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