辽西医巫闾山地区中、晚侏罗世地壳伸展作用的特征
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
医巫闾山地区位于华北克拉通北缘,燕山山脉东段,区内广泛发育的太古宙深变质岩以及区内的变质核杂岩和伸展盆地,为研究岩石圈的流变学特点和华北克拉通的破坏提供了素材,从而引起了地质学者的关注。本文根据区内韧性剪切带及花岗岩体和岩脉的变形特点,确定医巫闾山地区中生代花岗岩体及岩脉为同伸展侵位。同构造岩脉的SHRIMP年代学研究及其它年代学资料显示:医巫闾山地区发生过两期伸展变形,分别发生在中、晚侏罗世和早白垩世。剪切带内的构造要素、岩石显微组构及矿物优选方位显示:早期伸展作用方向为SW,形成于中、下地壳的中、高温环境,表现为较低的应力和低应变速率下的高温韧性变形;晚期伸展作用方向为NWW,形成于上地壳的中、低温环境,表现为高应变速率下的低温韧、脆性变形。区内中、晚侏罗世伸展变形的厘定,表明华北克拉通的破坏在燕山早期已经开始,中、晚侏罗世太平洋构造域的影响使华北东部形成了挤压与伸展共存的构造格局。
In recent years, lithosphere thinning and destruction of the North China Craton are intensively discussed. Extensional crustal detachment is the most important tectonic response of lithosphere thinning and Yiwulümetamorphic core complex is useful to research destruction of the North China Craton. Although a great many achievements about the geological structure and granite in Yiwulüshan area have been made, there are still some puzzles and arguments. This paper study the Mesozoic geological structure in Yiwulüshan area through field geological investigation, microstructure, lattice preferred orientations and SHEIMP geochronology. The results are as follows:
     ①Extensional crenulation cleavage, rodding structure and“L”tectonite in the ductile shear zone and previous view show that its extensional shear zone. The ductile shear zone in Yiwulüshan area has composed with two department: Waziyu ductile shear zone and Yiwulüshan ductile shear zone. The former is dominated by low-temperature ductile deformation and the latter dominated by high-temperature tenacity deformation.
     ②Yiwulüshan ductile shear zone deformed in the early and Waziyu ductile shear zone derormed in the late, the fabric deformed at low temperature transformed from the high-temperature fabric. Early extension is in the direction of 220°~136°, the direction of the late extension is 270°~290°. Angle between the direction of two stages extension is about 30°~60°.
     ③Emplacement of Mesozoic granite in research area is controlled by C and S foliation of ductile shear zone and the mylonitic foliation in granite coordinates to it in wall rock, witch implies the granitic pluton and dikes emplacement as syn-tectonic granite. The pluton emplace along or parallel to ductile shear zone as a bedding-sill, based on the deformation character of granite and structure zone in Yiwulüshan region. SHRIMP geochronology of the syn-extensional granite dike provides it emplaced at 155±2Ma, combine with previous data shows crustal extension occurred in Yiwulü-shan region in middle-late Jurassic and early Cretaceous.
     ④Microstructure and lattice preferred orientations of quartz in Yiwulüshan ductile shear zone implies that deformation temperature of early extension is 550℃~ 700℃, deformed at high temperature environment in the middle and lower crust. Analysis of dynamically recrystallised grain size shows the differential stress of early extension is 9.6~13.9Mpa, deformation of the rock mainly as mineral plastic flow under high temperature.
     ⑤Redefinition of Yiwulüshan region middle-late Jurassic extension in implies that the Yanshan region and western Liaoning Province in the extension system from late Middle Jurassic to early Late Jurassic, destruction of the North China Craton has already begun at middle Jurassic, eastern of North China has become subject to the control of the Pacific tectonic domain and become the tectonic framework both compress and extension.
引文
[1] Fan W M, Zhang H F, Baker J, et al. On and off the North China Craton: where is the Archaean Keel?[J]. Journal of Petrology, 2000, 41(7): 933-950.
    [2] Menzies M, Fan W M, Zhang M. Palaeozoic and Cenozoic lithoprobes and the loss of >120km of Archaean lithosphere, Sino-Korean Craton, China[M]// Prichard H M et al, eds. Magmatic Processes and Plate Tectonics. Geological Society Special Publication, 1993, 76: 71-81.
    [3] Deng J F, Mo X X, Zhao H L et al. A new model for the dynamic evolution of Chinese lithosphere:”Continental roots-plume tectonics”[J]. Earth-Science Reviews, 2004, 65(3-4): 223-275.
    [4] Zhou X H, Sun M, Zhang G H, et al. Continental crust and lithospheric mantle interaction beneath North China: isotopic evidence from granulite xenoliths in Hannuoba, Sino-Korean craton[J]. Lithos, 2002, 62(3-4): 111-124.
    [5]邓晋福,苏尚国,刘翠,等.关于华北克拉通燕山期岩石圈减薄的机制与过程的讨论:是拆沉,还是热侵蚀和化学交代?[J]地学前缘, 2006, 13(2): 105-119.
    [6]邓晋福,莫宣学,赵海玲.中国东部岩石圈根/去根作用与大陆“活化”-东亚型大陆动力学模式研究,现代地质, 1994, 8(3): 349-356.
    [7]邓晋福,苏尚国,赵海玲,等.华北地区燕山期岩石圈减薄的深部过程[J].地学前缘, 2003, 10(3): 41-50.
    [8]吴福元,孙德有.中国东部中生代岩浆作用与岩石圈减薄[J].长春科技大学学报, 1999, 29(4): 313-318.
    [9]吴福元,葛文春,孙德有,等.中国东部岩石圈减薄研究中的几个问题[J].地学前缘, 2002, 10(3): 51-60.
    [10]吴福元,徐义刚,高山,等.华北岩石圈减薄与克拉通破坏研究的主要学术争论[J].岩石学报, 2008, 24(6): 1145-1174.
    [11]刘俊来, Davis G A,纪沫,等.地壳的拆离作用与华北克拉通破坏:晚中生代伸展构造约束[J].地学前缘, 2008, 15(3): 72-81.
    [12]赵越,徐刚,张拴宏,等.燕山运动与东亚构造体制的转变[ J ].地学前缘, 2004, 11 (3) : 319-328.
    [13]赵越,张拴宏,徐刚,等.燕山板内变形带侏罗纪主要构造事件[ J ].地质通报, 2004, 23 (9-10) : 854-863.
    [14]翟明国,孟庆任,刘建明,等.华北东部中生代构造体制转折峰期的主要地质效应和形成动力学探讨[ J ].地学前缘, 2004, 11 (3) : 285-297.
    [15]邵济安,张履桥,牟保磊.构造体制转折是岩石圈尺度的行为[J].地质通报, 2004, 23(9-10):973-979.
    [16]马杏垣,刘和甫,王维襄,等.中国东部中、新生代裂陷作用和伸展构造[J].地质学报, 1983, (1): 22-32.
    [17]朱志澄.伸展构造和拆离断层[J].地质科技情报, 1987, 6(1): 18-25.
    [18]许志琴,李海兵,王宗秀,等.辽南地壳的收缩作用及伸展作用[J].地质论评, 1991, 37(3): 193-202.
    [19]李江海.造山带的伸展作用及其地壳演化意义[J].地质科技情报, 1992, 11(3): 10-18.
    [20]邵济安,臧绍先,牟保垒,等.造山带的伸展构造与软流圈隆起—以兴蒙造山带为例[J].科学通报, 1994, 39(6): 533-537.
    [21]辽宁省地质矿产局.辽宁省区域地质志[M].北京:地质出版社, 1989.
    [22]地矿部辽宁地勘局区域地质调查队三分队. 1:5万清河门镇幅、稍户营子镇幅、大榆树堡镇幅、罗罗堡幅、张家堡幅区域地质调查报告[M]. 1996.
    [23]吕晶,刘文海.辽西卡拉房子地区印支期构造特征[J].辽宁地质, 1994, (3): 255-262.
    [24]王伟峰,陆诗阔,孙月平.辽西地区构造演化与盆地成因类型研究[J].地质力学学报, 1997, 3(3): 81-89.
    [25]王汉霞,李世涛.辽宁西部两条大型韧性剪切带及其地质意义[J].辽宁地质, 1988, (3): 235-244.
    [26]张晓晖,李铁胜,蒲志平.辽西医巫闾山两条韧性剪切带的40Ar-39Ar年龄:中生代构造热事件的年代学约束[J].科学通报, 2002, 47(9): 697-701.
    [27]马寅生,崔盛芹,吴淦国,等.医巫闾山变质核杂岩构造特征[J]. 1999, 20(4): 385-391.
    [28]马寅生,崔盛芹,吴淦国,等.辽西医巫闾山的隆升历史[J].地球学报, 2000, 21(3): 245-253.
    [29]孟宪刚,冯向阳,邵兆刚,等.辽西医巫闾山变质核杂岩构造系统及其对金矿的控制[J].地质通报, 2002, 21(12): 841-847.
    [30]朱大岗,孟宪刚,马寅生,等.辽西医巫闾山变质核杂岩构造特征及其对金矿床的控制作用[J].大地构造与成矿, 2002, 26(2): 156-161.
    [31]朱大岗,孟宪刚,冯向阳,等.辽西医巫闾山变质核杂岩构造特征及其岩石组构的动力学分析[J].地球学报, 2003, 24(3):225-230.
    [32]孟宪刚,邵兆刚,曲玮,等.医巫闾山变质核杂岩中金矿的稳定同位素特征[J].地球学报, 2004, 25(3):299-302.
    [33]孟宪刚,邵兆刚,曲玮,等.辽西医巫闾山变质核杂岩拆离断裂带金矿成矿构造物理特征[J].地球学报, 2005, 26(8):343-348.
    [34]张宏,王五力,李之彤,等.辽西医巫闾山地区中生代两期韧性变形的研究[J].世界地质, 2004, 23(3): 213-220.
    [35] Darby B J, Davis G A, Zhang X H, et al. The newly discovered Waziyu metamorphic core complex, YiwulüShan, western Liaoning Province, Northwest China[J]. Earth Science Frontiers, 2004, 11(3): 145-155.
    [36] Buck W R. Modes of continental lithospheric extension[J]. Journal of Geophysical Research, 1991, 96: 20,161-20,178
    [37] Benes V, Davy P. Modes of continental lithospheric extension: experimental verification of strain localization processes[J]. Tectonophysics, 1996, 254(1-2): 69-87.
    [38]马杏垣.论伸展构造[J].地球科学, 1982, (3): 15-22.
    [39]朱志澄.伸展构造和拆离断层[J].地质科技情报, 1987, 6(1):18-25.
    [40]朱志澄.变质核杂岩和伸展构造研究述评[J].地质科技情报, 1994, 13(3): 1-9.
    [41]刘建忠,刘喜山,张福勤,等.辽宁阜新—锦州地区花岗杂岩特征及成因[J].地质地球化学, 2000, 28(3): 65-74.
    [42]许敏,薛林福,王东坡.辽西地区中生代火山-沉积盆地群特征及成因机制[J].世界地质, 1997, 16(2): 34-38.
    [43]马寅生.燕山东段~下辽河地区中新生代断裂演化与构造期次[J].地质力学学报, 1999, 5(3): 33-39.
    [44]王根厚,张长厚,王果胜,等.辽西地区中生代构造格局及其形成演化[J].现代地质, 2001, 15(1): 1-7.
    [45]苏传玉,雷广新,刘文海,等.闾山花岗岩地质特征及其成因探讨[J].辽宁地质, 1994, (1-2): 154-164.
    [46]杜建军,马寅生,赵越,等.辽西医巫闾山花岗岩锆石SHRIMP U-Pb测年及其地质意义[J].中国地质, 2007, 34(1): 26-33.
    [47]吴福元,杨进辉,张艳斌,等.辽西东南部中生代花岗岩时代[J].岩石学报, 2006, 22(2): 315-325.
    [48]郑亚东.共轭伸展褶劈理夹角的定量解析[J].地学前缘, 1999, 6(4): 391-395.
    [49] Platt J P, Vissers R L M. Extensional structures in anisotropic rocks[J]. Journal of Structural Geology, 1980, 2(4): 397-410.
    [50]胡玲,刘俊来,纪沫,等.变形显微构造识别手册[M].北京:地质出版社, 2010.
    [51] Goetze C, Kohlstedt D L. Laboratory study of dislocation climb anddiffusion in Olivine[J]. Jorunal of Geophysical Research, 1973, 78(26): 5961-5971
    [52] Post A, Tullis J. A recrystallized grain size paleopiezometer for experimentally deformed feldspar aggregates[J]. Tectonophysics, 1999, 303(1-4): 159–173.
    [53] Michibayashi K. Syntectonic development of a strain-independent steady-state grain size during mylonitization[J]. Tectonophysics, 1993, 222(2): 151–164.
    [54] Twiss R J. Theory and applicability of a recrystallized grain size paleopiezometer[J]. Pure and Applied Geophysics, 1977, 115(1-2):227-244.
    [55] Ludwing K R. Users Manual for Isoplot/(rev. 2.49): A Geochronological Toolkit for Mictosoft Excel. Berkeley Geochronology Center, Special Publication No.1a, 1-55.
    [56] Hirth G, Tullis J. Dislocation creep regimes in quartz aggregates[J]. Journal of Structural Geology, 1992, 14: 145-159.
    [57] Stipp M, Stünitz H, Heilbronner R, et al. The eastern Tonale fault zone: A natural laboratory for crystal plastic deformation of quartz over a temperature range from 250 to 700℃[J]. Journal of Structural Geology, 2002, 24: 1861-1884.
    [58] Neil S Mancktelow. The influence of grain boundary fluids on the microstructure of Quartz-feldspar Mylonites[J]. Journal of Structural Geology, 2004,26: 47-69.
    [59] Tullis J, Yund R A. Transition from cataclastic flow to dislocation creep of feldspar: Mechanisms and microstructures[J]. Geology, 1987, 15: 606-609.
    [60] Pryer L L. Microstructures in feldspars from a major crustalthrust zone: The Grenville Front, Ontario, Canada[J]. Journal of Structural Geology, 1993, 15: 21-36.
    [61] Simpson C. Deformation of granitic rocks across the brittle-ductile transition[J]. Journal of Structural Geology, 1985, 7(5): 503-511.
    [62] Lafrance B, John Barbara E, Frost B R. Ultra high-temperature and subsolidus shear zones: Examples from the Poe Mountain anorthosite, Wyoming[J]. Journal of Structural Geology, 1998, 20(7):945-955.
    [63] Altenberger U. Ductile deformation of K-feldspar in dry eclogite facies shear zones in the Bergen Arcs, Norway[J]. Tectonophysics, 2000, 320(2): 107-121.
    [64] Kruhl J H. Reply:prism-and basal-plane parallel subgrain boundaries in quartz: a microstructural geothermobarometer[J]. Journal of Metamorphic Petrology, 1998, 16: 142-146.
    [65] Berndt Neumann. Texture development of recrystallised quartz polycrystals unravelledby orientation and misorientation characteristics[J]. Journal of Structural Geology, 2000, 22(1-2): 1695-1711.
    [66] Wolfgang Unzog, Walter Kurz. Progressive development of lattice preferred orientations (LPOs) of naturally deformed quartz within a transpressional collision zone(Panafrican Orogen in the Eastern Desert of Egypt)[J]. Journal of Structural Geology, 2000, 22(11-12): 1827-1835.
    [67] Law R D, Searle M P, Simpson R L. Strain, deformation temperatures and vorticity of flow at the top of Greater Himalay-an Slab, Everest Massif, Tibet[J]. Journal of the Geological Society, 2004, 161: 305-320.
    [68]徐海军,金淑燕,郑伯让.岩石组构学研究的最新技术—电子背散射衍射(EBSD)[J].现代地质, 2007, 21(2): 213-225
    [69]刘俊来,曹淑云,邹运鑫,等.岩石电子背散射衍射(EBSD)组构分析及应用[J].地质通报, 2008, 27(10): 1638-1645.
    [70] Passchier C W, Trouw R A J. Microtectonics[M]. 2nd ed. Berlin: Springer-Verlag, 2005
    [71]任纪舜,牛宝贵,和政军.中国东部的构造格局和动力演化[J].地学研究, 1997 (29/30): 43-55.
    [72]李三忠,刘建忠,赵国春.华北克拉通东部地块中生代变形的关键时限及其对构造的制约-以胶辽地区为例[J].岩石学报, 2004, 20(3): 633-646.
    [73]李三忠,郝德峰,赵国春,等.丹东花岗岩的地球化学特征及其成因[J].岩石学报, 2004, 20(6): 1417-1423.
    [74]李三忠,王金铎,刘建忠,等.鲁西地块中生代挤压构造格局及其形成背景.地质学报, 2005, 79(4): 487-497.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700