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桐柏-大别造山带加里东期构造热事件及其意义 总被引：17，自引：2，他引：15
桐柏－ 大别造山带是多旋回发展的复合造山带,至少有晋宁期、加里东期和印支期三个造山旋回。加里东旋回结束洋壳发展历史,经历了广泛的区域变质作用和局部强烈的高压超高压变质作用,具有划时代意义。桐柏－ 大别造山带加里东期具小洋盆、微古陆、多岛海古地理面貌,总体向北俯冲,最终形成陆 陆碰撞造山带。进一步可划分为三个各具特色的单元：北淮阳构造带是一个板块碰撞混杂带;中间隆起区相当于岛弧性质,但它部分地段曾一度伴随小洋盆俯冲至深处,形成高压超高压变质带;随应褶皱带为大陆裂谷性质,并具某些弧后盆地特征。它们共同构成了大陆造山带复杂的内部结构构造特征。桐柏－ 大别造山带向东被后期的郯庐断裂所截;向西与秦岭造山带相连。通过区域地质和古地磁对比,加里东期秦岭造山带开裂规模更大,蛇绿岩更发育,构成一个向西开口的喇叭形;碰撞时大别造山带先碰,然而逐渐向西迁移 相似文献
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中央山系大别-东秦岭和东昆仑造山带最古老岩系变质过程对比 总被引：3，自引：2，他引：1
大别造山带、东秦岭造山带和东昆仑造山带是中国中央山系的主要构成部分,每个造山带古老岩系的变质作用过程各具特色．大别山最古老岩系大别岩群于印支期陆内俯冲碰撞,发生了区域性的中偏高压区域变质作用,顺时针型ｐｔ轨迹上ｔｍａｘ和ｐｍａｘ近于同时达到,退变质轨迹段斜率陡,埋深后受构造驱动快速抬升到上中地壳．东秦岭最古老岩系秦岭岩群在晋宁期（约１．０Ｇａ前）初始板块构造总背景下发生强烈的中压型碰撞变质作用,顺时针型ｐｔ轨迹上ｔｍａｘ在压力大幅度降低的过程中达到,反映弧陆碰撞增厚后深埋岩系受重力均衡抬升;至加里东期,秦岭岩群再次在板块构造的总背景下发生岛弧型变质,局部叠加中压型接触变质作用;晚海西以来北秦岭东段缺乏高于低角闪岩相条件的区域变质作用记录．东昆仑造山带最古老岩系于吕梁或早吕梁期发生中压碰撞区域变质,主体为角闪岩相,局部高角闪岩相－麻粒岩相条件,造山带剥露较浅使低压变质带得以良好保存． 相似文献
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中央山系大别,东秦岭和东昆仑造山带最古老岩系变 … 总被引：1，自引：1，他引：0
大别造山带,东秦岭造山带和东昆仑造山带是中国中央山系的主要构成部分,每个造山带古老岩系的变质作用过程各具特色,大别山最古老岩系大别岩群于印支期内俯冲碰撞,发生了区域性的中偏高压区域变质作用,顺时针型ｐｔ轨迹ｔｍａｘ和ｐｍａｘ近于同时达到,退这质轨迹段斜率陡,埋深后受构造驱动快速抬升到上中地壳,东秦岭是古老系秦岭岩群在要期（约１．０Ｇａ前）初始板块构造总背景下发生强烈的中压型碰撞变质作用,顺时针型ｐ 相似文献
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苏鲁造山带浅变质岩的成因及其大地构造意义 总被引：2，自引：0，他引：2
苏鲁造山带超高压变质带内部及其北缘,出露仅经过绿片岩相变质作用的浅变质岩系。通过对该浅变质岩的区域分布、地质特征及地球化学的综合研究,表明这些浅变质岩系与大别-苏鲁造山带大陆板块俯冲存在密切的成因关系,为扬子板块俯冲过程中被刮削下来的构造残片,构成大陆板块俯冲过程中形成的构造加积杂岩。在此基础上,厘定了苏鲁造山带的构造成因模型,并对苏鲁造山带的东延问题进行了讨论。 相似文献
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北秦岭造山带榴辉岩及相关岩石的地球化学特征 总被引：6，自引：0，他引：6
本文介绍了新近在北秦岭造山带中发现的高压－－超高压变质带和松树沟高压变质带代表性变质岩的化学成分，微量元素和稀土元素特征。这些高压、超高压变质岩的原岩多为基性火成岩。产在北秦岭造山带中的高压－超高压变质岩的地球化学特征与东部产在南秦岭造山带的同类岩石有许多相似之处，推测秦岭－－大别造山带从南到北是在同一个岩石圈上演化来的，不是不同地块拼接成的。 相似文献
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中国中央造山带内至少发育两个超高压变质带,一个是南阿尔金-柴北缘-北秦岭超高压变质带,超高压峰期变质年龄为早古生代(500～400 Ma),代表扬子与中朝克拉通间的深俯冲和碰撞带;另一个是研究程度较高的大别-苏鲁超高压和高压变质带,峰期变质年龄主体是三叠纪(250～220 Ma),代表扬子克拉通内部的陆内大陆深俯冲和碰撞带。对东秦岭看丰沟及香坊沟的变质岩片详细岩石学和构造学研究以及先期造山带尺度的构造、岩石和年代学研究资料分析证明,南阿尔金-柴北缘-北秦岭超高压变质带,向东不能与大别-苏鲁超高压和高压变质带的任一部分相连,包括南大别和西北大别超高压及高压变质岩石。相反,大别-苏鲁超高压及高压变质带,向西经桐柏山,横过南襄盆地延伸到南秦岭的西峡及商南一带。仅在东秦岭-大别山范围内,两个超高压变质带分别位于南丹断裂系南北两侧,沿造山带近平行延展,之间被一系列以断裂或剪切带为边界的岩石构造岩片相隔,不能构成横贯中国中部统一的巨型超高压变质带。任何有关中国中央造山带构造格架及构造演化模型的建立,均应考虑其内部发育两个时代和功能不同的超高压变质带。 相似文献
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大别造山带的构造演化 总被引：5，自引：0，他引：5
大别地块是扬子地块北缘中晚元古代古岛弧的一部分，加里东期，它作为扬子地块北部陆缘的水下隆起，与华北地块南缘的早古生代古岛弧碰撞拼合，古洋壳消失，完成了南北两大陆块的对接，开始进入漫长的陆内俯冲时期，大别造山带就是扬子地块，大别地块和华北地块在陆内俯冲作用下，依次叠覆的结果，印支期是大别山的主变形期和高压动力变质时期，燕山期是主要的造山期，基底剪切引起地壳重熔，导致大范围的热流变质作用。大别地块的降 相似文献
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Qiu and Wijbrans [Qiu H.-N. and Wijbrans J. R. (2006) Paleozoic ages and excess 40Ar in garnets from the Bixiling eclogite in Dabieshan, China: new insights from 40Ar/39Ar dating by stepwise crushing. Geochim. Cosmochim. Acta70, 2354-2370] present three Ar-Ar age spectra for fluid inclusions in garnet from eclogite at Bixiling in the Dabie orogen, east-central China. These Paleozoic ages of 427 ± 20 to 444 ± 10 Ma are interpreted to represent the first formation of Dabie ultrahigh-pressure (UHP) eclogite and thus require subduction of Yangtze crust to have started much earlier than previously accepted. However, no petrographic evidence, such as mineral inclusions in the garnet relating to the particular metamorphic conditions, is presented to substantiate the proposed UHP metamorphic event. Because garnet growth is not uniquely responsible for UHP eclogite-facies metamorphism, a distinction between UHP and high-pressure (HP) metamorphic events must be made in the interpretation of geochronological results. Available data from mineral Sm-Nd and zircon U-Pb dating of eclogites from the same area have firmly established that the UHP eclogite-facies metamorphism took place at Triassic. Neither the age of UHP metamorphism nor the timing of continental collision is reliably constrained by their presented data; the fluid inclusions in garnet must contain inherited 40Ar from UHP eclogite precursor, without considerable resetting of the Ar-Ar isotopic system during Triassic UHP metamorphism. Therefore, their data are either meaningless, or at best viewed as the age of garnet growth by low-T/HP blueschist/eclogite-facies metamorphism of the UHP eclogite precursor during arc-continent collision in the early Paleozoic. Furthermore, it is critical for metamorphic geochronology to substantiate the timing of UHP metamorphic event by means of zircon U-Pb in situ dating on coesite-bearing domains of metamorphically grown zircon. 相似文献
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《International Geology Review》2012,54(10):859-885
Sm-Nd isotope tracer techniques are powerful tools in identification of the protolith nature of UHP and HP rocks and can be used to constrain modeling of tectonic processes of continental collision. UHP rocks may have diverse origins, and not all of them carry the same significance for subduction of continental blocks. In this paper, Sm-Nd isotopic data are compiled for UHP and HP rocks, mostly represented by eclogites and garnet peridotites, from the Alpine, Hercynian (Variscan), and Caledonian belts of western Europe; the Pan-African belts of northern Africa; and the Ross belt of Antarctica. These data then are compared with the isotopic characteristics of the UHP rocks from the Dabie orogen of central China. Except for the coesite-bearing quartzitic metasediments of Dora-Maira (Western Alps), which are clearly of continental origin, all HP and UHP rocks (eclogites and ultramafic rocks) from the Alpine, Hercynian, and Pan-African belts have oceanic affinities with the characteristic positive εNd(T) values (= metamorphic initial 143Nd/144Nd ratios). They represent segments of oceanic lithosphere that were subducted, underwent eclogite-facies metamorphism, and later were tectonically transported into orogenic zones during continental collisions. By contrast, the majority of UHP rocks from the European Caledonide and the Dabie orogen have negative εND(T) values, indicating continental affinity. This suggests that these mafic and ultramafic rocks have had a long crustal residence time and that their UHP metamorphism is indicative of subduction of ancient and cold continental blocks, as represented by some Precambrian gneiss terranes containing mafic components including greenschists, amphibolites, or basic granulites. In the Dabie orogen, none of the UHP eclogites analyzed thus far have shown oceanic affinity; thus they do not represent subducted Tethys Ocean crust. The preservation of ultrahigh εND(0) values (+170 to +260) in eclogites of very low Nd concentrations (average 0.5 ppm) from the Weihai region and of the extraordinarily low δ18O in many eclogites and gneisses, the general absence of syntectonic granites in the Dabie Shan, and the available age data obtained by different techniques all point to a rapid rate of exhumation and the absence of a pervasive aqueous fluid phase during the entire process of subduction and exhumation of the Dabie UHP terrane. 相似文献
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Petrographic and SHRIMP Studies of Zircons fromthe Caledonian Xiongdian Eclogite, NorthwesternDabie Mountains 总被引：2，自引：0，他引：2
I.S.WILLIAMS 《《地质学报》英文版》2000,74(4):766-773
The Xiongdian eclogite occurring in the Sujiahe tectonic melange zone at Luoshan County, Henan Province, in the western Dabie Mountains, is typical high-pressure (HP)-ultrahigh-pressure (UHP) and medium-temperature eclogite. The occurrence, internal texture and surface characteristics of zircons in eclogite were studied rather systematically petrographically combined with the cathodoluminescence (CL) and scanning electron microscope (SEM) methods. Zircons are mainly hosted in garnet and other metamorphic minerals with sharp boundaries, have a multifaceted morphology and are homogeneous or exhibit a metamorphic growth texture in the interior, thus indicating that they are the product of metamorphism. SHRIMP analyses give zircon 206Pb/238U ages of 335 to 424 Ma and show a certain degree of radiogenic Pb loss; therefore it may be inferred that the age of 424? Ma represents the minimum age of a HP-UHP metamorphic age. From the above analyses coupled with previous Sm-Nd, 40Ar-39Ar, U-Pb and 207Pb/206Pb age d 相似文献
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《International Geology Review》2012,54(7):636-662
The Kokchetav and Dabie Shan complexes are typical examples of ultrahigh-pressure metamorphic complexes (UHPM) and are important units of the largest suture zones within the Eurasian continent. The Dabie Shan complex is located in the center of a long Permian-Triassic high-pressure (HP) belt between the Sino-Korean and Yangtze cratons. Other members of this belt are the Sulu region of of NE China, the Imjingang belt in Korea, the Sangun and Marginal Hida belts in Kyushu, the Spassk zone in the Sikhote-Alin of the Russian Far East, and the Bikou, Animaqing, Ailaoshan, and Lancang belts in China bounding the western margin of the Yangtze craton. The Kokchetav complex is located in the center of the largest Early Paleozoic HP belt in Asia, which includes the North Qilian complex, the Kekesu and Atbashi zones of the Tien Shan, and the Aktyuz and Makbal areas in the North Kyrgyz Range. The structure of the Kokchetav complex is interpreted as a mega-melange zone that consists of seven tectonic units separated by tectonic thrusts or faults. There are many similarities between the Kokchetav and Dabie Shan tectonic units. Principal differences relate to the rocks of coeval island-arc series abundantly exposed in the Kokchetav area, but absent in the Dabie Shan, and to the ongoing subduction and island-arc magmatism in Kokchetav after the collision and UHP metamorphism compared to the final collision after UHP metamorphism in the Dabie Shan. The Caledonian Kokchetav complex formed in the Early Paleozoic, whereas the Indosinian Dabie Shan complex formed in the Early Mesozoic; however, both complexes are characterized by a close succession of events and the occurrence of a Late Proterozoic protolith. In both cases magmatic events occurred in 150-m.y. intervals. Retrograde stages, cooling histories, and exhumation processes are similar for both complexes. Comparison of mineral assemblages in those complexes indicates higher temperature and pressure in the Kokchetav peak assemblages. The best containers for preserved UHP mineral assemblages are metacarbonate rocks and zircon and garnet from metapelites and felsic rocks in both regions. The Dabie Shan UHP assemblages are better preserved than the Kokchetav ones, which has to do either with their higher temperature or with specific kinetics. Oxidation conditions deduced from mineral distributions, mineral chemistry, and composition of fluid inclusions indicate the higher oxygen potential in the Dabie Shan than in the Kokchetav rocks. The comparison allows us to conclude the following: 1. The small size of sheets and blocks of UHPM rocks supports a model for reverse flows within a subduction-accretionary wedge or tectonic exhumation of thin sheets, but not uplifting of large blocks. 2. The preservation of coesite and diamond, and the presence of thin reactionary rims (primarily in the Dabie Shan), provides evidence for a very short time of retrograde reactions and high velocity of block uplifting. Thus, three exhumation stages are accepted: (1) superfast uplifting; (2) rapid uplifting up to the sole of the continental crust; and (3) slow uplifting within the continental crust. In the Kokchetav complex, the first stage is absent. 3. For the Dabie Shan we suggest a complex scenario implying two-stage subduction and subsequent collision. Comparison with the Kokchetav complex shows that UHP metamorphism is not likely to have resulted from a collision, but the latter was responsible for the superfast exhumation of thin sheets of UHPM rocks from depths of over 100 km. 相似文献
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形成于印支期的大别造山带和周缘中生代盆地构成了一级源汇系统,其中位于造山带北缘的合肥盆地中生代地层发育,且以盆地南缘出露最好,这为盆山源汇系统研究提供了理想的沉积记录。笔者从合肥盆地南缘采集了10个砂岩样品和1个砾岩样品,进行锆石U/Pb (LA-ICP-MS)定年分析,获得了742个有效年龄(置信度不小于85%),范围为113±3. 6-2983 Ma。这些碎屑锆石年龄谱可以被分为5个年龄段:113-137 Ma,峰值131 Ma; 184-273 Ma,峰值226 Ma; 274-517. 3 Ma,具有2个峰值280 Ma和474 Ma; 532-856. 6 Ma,具有3个峰值572 Ma、649 Ma和772 Ma; 1786-2600 Ma,具有2个峰值2035 Ma和2506 Ma。同时,总结了物源区大别造山带不同单元锆石U-Pb年龄特征。根据锆石U/Pb年龄和Th/U值,发现这5个年龄段比较准确地记录了物源区地质体,分别是早白垩世的岩浆岩、大别山高压—超高压变质岩、北淮阳的浅变质岩、北大别的正片麻岩和卢镇关群变质岩。根据锆石最小年龄,修正了合肥盆地南缘中生代地层格架,为源汇系统研究确立了时间框架。合肥盆地南缘中生代沉积可以分为4个演化阶段:晚三叠世瑞替期—早侏罗世辛涅缪斯期、中—晚侏罗世、早白垩世早期和早白垩世晚期,并据此确定了每个阶段主要物源区特征及其时空变化。碎屑锆石U/Pb年龄和Th/U值限定了大别造山带仅存在三叠纪的超高压变质作用,且超高压变质岩折返到地表的最早时间是晚三叠世瑞替期,大别造山带大陆岛弧发育的时间是新元古代。上述研究结果不仅为恢复大别造山带构造古地理做出了新的贡献,而且更为盆山源汇系统研究提供了一个实例。 相似文献
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You Zhendong Han Yujing Zhong Zengqin Sang Longkang Chen Nengsong Zhang Zeming 《中国地质大学学报(英文版)》1995,(1)
Ｐｅｔｒｏｇｅｎｅｓｉｓ ｏｆ Ｅｃｌｏｇｉｔｅｓ ｉｎ ｔｈｅ Ｌｉｇｈｔ ｏｆ ＰｕｎｃｔｕａｔｅｄＭｅｔａｍｏｒｐｈｉｃ Ｅｖｏｌｕｔｉｏｎ ｉｎ Ｄａｂｉｅ Ｔｅｒｒａｎｅ，Ｃｈｉｎａ￥ＹｏｕＺｈｅｎｄｏｎｇ；ＨａｎＹｕｊｉｎｇ；ＺｈｏｎｇＺ... 相似文献
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A variety of eclogites from an east-west transect across the North-East Greenland eclogite province have been studied to establish the timing of high pressure (HP) and ultrahigh-pressure (UHP) metamorphism in this northern segment of the Laurentian margin. Garnet + omphacite ± amphibole + whole rock Sm-Nd isochrons from a quartz eclogite, a garnet + omphacite + rutile eclogite and a partially melted zoisite eclogite in the western HP belt are 401±2, 402±9 and 414±18 Ma, respectively. Corresponding sensitive high-resolution ion microprobe (SHRIMP) 206Pb/238U ages of metamorphic zircon in the same samples are 401±7, 414±13, and 393 ±10 Ma. Metamorphic zircon domains were identified using morphology, cathodoluminescence (CL) imaging, U, Th, Th/U and trace element contents. Zircon from the quartz eclogite and the garnet + omphacite + rutile eclogite are typical of eclogite facies zircon with rounded to subhedral shapes, patchy to homogenous CL domains, low U, and very low Th and Th/U. The partially melted eclogite contains euhedral zircons with dark, sector-zoned, higher U, Th and Th/U inherited cores. Three cores give a Paleoproterozoic 207Pb/206Pb age of 1,962±27 Ma, interpreted as the age of the leucogabbroic protolith. CL images of the bright overgrowths show faint oscillatory zoning next to homogenous areas that indicate zircon growth in the presence of a HP melt and later recrystallization. Additional evidence that zircon grew during eclogite facies conditions is the lack of a Eu anomaly in the trace element data for all the samples. These results, combined with additional less precise Sm-Nd ages and our earlier work, point to a Devonian age of HP metamorphism in the western and central portions of the eclogite province. An UHP kyanite eclogite from the eastern part of the transect contains equant metamorphic zircon with homogeneous to patchy zoning in CL and HP inclusions of garnet, omphacite and kyanite. These zircons have slightly higher U, Th and Th/U values than the HP ones, no Eu anomaly, and are thus comparable to UHP zircons in the literature. The 206Pb/238U age of these zircons is 360±5 Ma, much younger than the HP eclogites. The same sample gives a Sm-Nd age of 342±6 Ma. Unlike the HP eclogites, the Sm-Nd age of the UHP rock is ca. 20 Ma younger than the U-Pb zircon age and most likely records slow cooling through the closure temperature, since peak temperatures were in excess of 900°C. Widespread HP metamorphism of both the Laurentian and Baltica continental margins marks the culmination of this continent–continent collision in the Devonian. Carboniferous UHP conditions, though localized in the east, suggest a prolonged collisional history rather than a short-lived Scandian orogeny. The traditional Silurian Scandian orogeny should thus be extended through the Devonian. 相似文献
18.
大别山北部榴辉岩和英云闪长质片麻岩锆石U-Pb年龄及多期变质增生 总被引：50，自引：3，他引：47
大别山北部榴辉岩及英云闪长质片麻岩的锆石U-Pb年龄分析表明：北部榴辉岩相峰期变质时代为226～230Ma左右;北部塔儿河一带英云闪长质片麻岩经历过印支期变质事件;大别山北部与南部超高压岩石中一致的（226～230Ma）高压或超高压变质年龄表明,北部镁铁-超镁铁质岩带中部分岩石也曾作为扬子俯冲陆壳的一部分,在印支期发生过高压或超高压变质作用;本区锆石发生过两期变质增生事件,一是印支期高压或超高压变质,另一期是燕山期热变质事件;榴辉岩及英云闪长质片麻岩的原岩形成时代为晚元古代;锆石U-Pb年龄可用多期变质增生模型来解释。 相似文献
19.
Based on new evidence the Sulu orogen is divided from south‐east to north‐west into high‐pressure (HP) crustal slice I and ultrahigh‐pressure (UHP) crustal slices II and III. A combined set of mineral inclusions, cathodoluminescence images, U‐Pb SHRIMP dating and in situ trace element and Lu‐Hf isotope analyses was obtained on zircon from orthogneisses of the different slices. Zircon grains typically have three distinct domains that formed during crystallization of the magmatic protolith, HP or UHP metamorphism and late‐amphibolite facies retrogression, respectively: (i) oscillatory zoned cores, with low‐pressure (LP) mineral inclusions and Th/U > 0.38; (ii) high‐luminescent mantles (Th/U < 0.10), with HP mineral inclusions of Qtz + Grt + Arg + Phe + Ap for slice I zircon and Coe + Grt + Phe + Kfs + Ap for both slices II and III zircon; (iii) low‐luminescent rims, with LP mineral inclusions and Th/U < 0.08. Zircon U‐Pb SHRIMP analyses of inherited cores point to protolith ages of 785–770 Ma in all seven orthogneisses. The ages recorded for UHP metamorphism and subsequent retrogression in slice II zircon (c. 228 and c. 215 Ma, respectively) are significantly older than those of slice III zircon (c. 218 and c. 202 Ma, respectively), while slice I zircon recorded even older ages for HP metamorphism and subsequent retrogression (c. 245 and c. 231 Ma, respectively). Moreover, Ar‐Ar biotite ages from six paragneisses, interpreted as dating amphibolite facies retrogression, gradually decrease from HP slice I (c. 232 Ma) to UHP slice II (c. 215 Ma) and UHP slice III (c. 203 Ma). The combined data set suggests decreasing ages for HP or UHP metamorphism and late retrogression in the Sulu orogen from south‐east to north‐west. Thus, the HP‐UHP units are interpreted to represent three crustal slices, which underwent different subduction and exhumation histories. Slice I was detached from the continental lithosphere at ～55–65 km depth and subsequently exhumed while subduction of the underlying slice II continued to ～100–120 km depth (UHP) before detachment and exhumation. Slice III experienced a similar geodynamic evolution as slice II, however, both UHP metamorphism and subsequent exhumation took place c. 10 Myr later. Magmatic zircon cores from two types of orthogneiss in UHP slices II and III show similar mid‐Neoproterozoic crystallization ages, but have contrasting Hf isotope compositions (εHf(～785) = ?2.7 to +2.2 and ?17.3 to ?11.1, respectively), suggesting their formation from distinct crustal units (Mesoproterozoic and Paleoproterozoic to Archean, respectively) during the breakup of Rodinia. The UHP and the retrograde zircon domains are characterized by lower Th/U and 176Lu/177Hf but higher 176Hf/177Hf(t) than the Neoproterozoic igneous cores. The similarity between UHP and retrograde domains indicates that late retrogression did not significantly modify chemical and isotopic composition of the UHP metamorphic system. 相似文献
20.
Extensional Tectonic Framework of Post High and Ultrahigh Pressure Metamorphism in Dabieshan, China 总被引：3，自引：0，他引：3
ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔｕｄｙｏｆｈｉｇｈ－ｐｒｅｓｓｕｒｅ（ＨＰ）ａｎｄｕｌｔｒａｈｉｇｈ－ｐｒｅｓｓｕｒｅ（ＵＨＰ）ｍｅｔａｍｏｒｐｈｉｃｒｏｃｋｓｉｓｏｎｅｏｆｔｈｅｍａｊｏｒｈｏｔｔｏｐｉｃｓｉｎｔｈｅｓｏｌｉｄｅａｒｔｈｓｃｉｅｎ... 相似文献