大别—苏鲁区残余超高压构造及其动力学意义

索书田; 钟增球; 游振东; 周汉文

大别—苏鲁区残余超高压构造及其动力学意义

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质大学地球科学学院, 武汉 430074

基金项目:

国家重大基础发展项目 G1999075506

国家自然科学基金资助项目 49972067

国家自然科学基金资助项目 49794041

国家自然科学基金资助项目 49772146

详细信息

作者简介:
索书田, 男, 教授, 1936年生, 长期从事构造地质学、岩石圈流变学和显微构造学的教学和研究工作, 近年来主要进行超高压-高压变质岩构造学研究

中图分类号: P541
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出版历程
- 收稿日期: 2000-06-29
- 刊出日期: 2000-11-25

RELIC UHP STRUCTURES IN DABIE-SULU REGION, CHINA: STRUCTURAL EXPRESSION AND GEODYNAMIC SIGNIFICANCE

1.
Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 根据构造学及岩石学研究并结合已有同位素年代学资料地质意义分析证明, 现在观察到的大别-苏鲁超高压变质带的区域构造框架, 主要是在三叠纪中朝与扬子克拉通碰撞期后(200~170 Ma) 伸展体制和角闪岩相条件下形成的. 残余的同碰撞及超高压构造只保留在较大的榴辉岩及其他超高压变质岩体内部. 以湖北省麻城县乘马岗和何家湾、安徽省岳西县碧溪岭及江苏省东海等地区的榴辉岩为例, 分析描述了具弱面理的块状榴辉岩、超高压剪切带和A型褶皱等残余超高压构造. 强调指出, 只是这些早期的构造记录才反映大陆碰撞阶段的构造环境及相对运动学特征. 据此提出一个运动学模型, 表示三叠纪(240~210 Ma) 扬子克拉通向北俯冲于中朝克拉通之下并与其发生斜向碰撞的动力学格局.
- 残余UHP构造 /
- 伸展过程 /
- 挤压体制 /
- 拉伸线理 /
- 大别-苏鲁区
Abstract: Structural and petrological research combined with the geological analysis of the isotopic dating references available now is used in this paper to demonstrate that the present day observed tectonic framework of the ultrahigh pressure (UHP) metamorphic belt in the Dabie Sulu region was formed dominantly in an extensional process at 200-170 Ma, on amphibolite facies conditions, following the Triassic collision between the Sino Korean and Yangtze cratons. The relic syn collision and UHP structures are preserved in the relatively large eclogite and other UHP metamorphic rock masses. Examples of the eclogite drawn from the Chengmagang and Hejiawan in Hubei Province, the Bixiling in Anhui Province, and Donghai in Jiangsu Province, are used to analyze and describe such relic UHP structures as the massive eclogite with weak foliations, the UHP shear zones and A type folds. It is stressed in the paper that only early UHP relic structural records may reflect the tectonic environment in the continental collision stage, and the corresponding relative dynamic features. On this basis, a kinematic model is proposed to represent the dynamic framework of the northward subduction of the Triassic (240-210 Ma) Yangtze craton under the Sino Korean craton and of their corresponding oblique collision.
- relic UHP structure /
- extensional process /
- compressive regime /
- stretching lineation /
- Dabie Sulu region

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图 1 大别-苏鲁三叠纪碰撞期后伸展构造略图

QHF.确山-合肥断裂带; XFF.信阳-肥西断裂带; GMF.龟山-梅山断裂带; JMF.军马河-马蹄湾断裂带; BMXF.八里畈-磨子潭-晓天断裂带; XGF.襄樊-广济断裂带; TLF.郯城-庐江断裂带; WYF.五莲-烟台断裂带; CC.核部杂岩; UHP.超高压单位; HP.高压单位; EB. 绿帘石-蓝片岩单位; SC.沉积盖积

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图 2 湖北省麻城县乘马岗UHP变质带横剖面

1.榴辉岩; 2.片麻岩; 3.岩墙

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图 3 湖北省麻城县何家湾地区构造略图及剖面

1.晚中生代岩墙; 2.面理化含榴花岗岩; 3.绿帘二云母片麻岩; 4.小型榴辉岩透镜体; 5.具挤压组构的榴辉岩透镜体; 6.伸展面理及拉伸线理; 7.断层

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图 4 江苏东海UHP榴辉岩带构造略图

等面积赤平投影图内, 黑三角示UHP面理极点(计20个), 伸展面理(计42个) 等值线为百分之一面积内2.4%, 7.1%, 11.9%, 16.7%.1.榴辉岩; 2.橄榄岩; 3.同碰撞面理; 4.伸展面理; 5.片麻岩; 6.拉伸线理方向

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图 5 三叠纪中朝与扬子克拉通间碰撞运动学模式

YC.扬子克拉通; SKC.中朝克拉通; BMXF.八里畈-磨子潭-晓天断层; GMF.龟山-梅山断层; Ec.榴辉岩

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参考文献(38)

[1]	Cong B, Wang Q, Zhai M, et al. Ultrahigh-pressure metamorphic rocksin the Dabie-Su-Lu region, China: their formation and exhumation[J]. The Island Arc, 1994, 3: 135~150. doi: 10.1111/j.1440-1738.1994.tb00103.x
[2]	Liou J G, Zhang R Y, Wang X, et al. Metamorphism and tectonics of high-pressure and ultra-high-pressure belts in the Dabie-Sulu region, China[A]. In: Yin A, Harrison M T, eds. Rubey Volume Ⅷ, Tectonic development of Asia[C]. Cambridge: Cambridge University Press, 1996. 300~344.
[3]	Hacker B R, Wang X, Eide E A, et al. The QinlingDabie ultrahigh-pressure collisional orogen[A]. In: Yin A, Harrison M T, eds. Rubey Volume Ⅷ, Tectonic development of Asia[C]. Cambridge: Cambridge University Press, 1996. 345~370.
[4]	Ernst W G, Liou J G. Overview of UHP metamorphism and tectonics in well-studied collisional orogens[J]. International Geology Review, 1999, 41: 477~493. doi: 10.1080/00206819909465153
[5]	Wallis S, Enami M, Banno S. The Sulu UHP terrane: a review of the petrology and structural geology[J]. International Geology Review, 1999, 41: 906~920. doi: 10.1080/00206819909465178
[6]	Jahn B M. Sm-Nd isotope tracer study of UHP metamorphic rocks: implications for continental subduction and collisional tectonics[J]. International Geology Review, 1999, 41: 859~885. doi: 10.1080/00206819909465175
[7]	Webb L E, Hacker B R, Ratschbacher L, et al. Thermochronologic constraints on deformation and cooling history of high- and ultrahigh-pressure rocks in the Qinling-Dabie orogen, eastern China[J]. Tectonics, 1999, 18: 621~638. doi: 10.1029/1999TC900012
[8]	索书田. 大别地块超高压变质省的构造变形研究[J]. 地学前缘, 1999, 6: 255~262. doi: 10.3321/j.issn:1005-2321.1999.04.008
[9]	索书田, 钟增球, 游振东. 大别地块超高压变质期后伸展变形及超高压变质岩石折返过程[J]. 中国科学(D辑), 2000, 30: 9~17. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200001001.htm
[10]	Zhong Z, Suo S, You Z. Regional-scale extensional tectonic pattern of ultrahigh-pressure and high-pressure metamorphic belts from the Dabie massif, China[J]. International Geology Review, 1999, 41: 1033~1041. doi: 10.1080/00206819909465188
[11]	Zhang R Y, Liou J G, Cong B. Petrogenesis of garnetbearing ultramafic rocks and associated eclogites in the SuLu ultrahigh-p metamorphic terrane, eastern China[J]. Journal of Metamorphic Geology, 1994, 12: 169~186. doi: 10.1111/j.1525-1314.1994.tb00012.x
[12]	Zhang R Y, Hirajima T, Banno S, et al. Petrology of ultrahigh-pressure rocks from the southern Su-Lu region, eastern China[J]. Journal of Metamorphic Geology, 1995, 13: 659~675. doi: 10.1111/j.1525-1314.1995.tb00250.x
[13]	李曙光, 李惠民, 陈移之, 等. 大别山—苏鲁地体超高压变质年代学—Ⅱ. 锆石U-Pb同位素体系[J]. 中国科学(D辑), 1997, 27: 200~206. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199703001.htm
[14]	Hacker B R, Wang Q. Ar/Ar geochronology of ultrahighpressure metamorphism[J]. Tectonics, 1995, 14: 994 ~1006. doi: 10.1029/95TC00932
[15]	Hacker B R, Ratschbacher L, Webb L, et al. U/Pb zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie orogen, China[J]. Earth and Planetary Science Letters, 1998, 161: 215~230. doi: 10.1016/S0012-821X(98)00152-6
[16]	Wang Q, Cong B. Exhumation of UHP terrane: a case study from the Dabie Mountains, eastern China[J]. International Geology Review, 1999, 41: 994~1004. doi: 10.1080/00206819909465185
[17]	Ree J H, Cho M, Kwon S T, et al. Possible eastward extension of Chinese collision belt in South Korea: the Imjingang belt[J]. Geology, 1996, 24: 1071~1074.
[18]	朱光, 徐嘉炜. 郯庐断裂带与大别—胶南造山带的构造关系[A]. 见: 马宗晋, 杨主恩, 吴正文, 编. 构造地质学-岩石圈动力学研究进展[C]. 北京: 地震出版社, 1999. 164~170.
[19]	Suo S, Zhong Z. Multi-layered low-angle ductile detachment system in Dabie-Sulu UHPM and HPM belts, China [J]. Journal of China University of Geosciences, 1999, 10: 187~193.
[20]	Meng Q R, Zhang G W. Timing of collision of the North and South China block: controversy and reconciliation [J]. Geology, 1999, 27: 123~126.
[21]	Wang Q, Liu X, Maruyama S, et al. Top boundary of the Dabie UHPM rocks, central China[J]. Journal of Southeast Asian Earth Sciences, 1995, 11: 295~300. doi: 10.1016/0743-9547(94)00035-D
[22]	Xu S, Okay A I, Ji S, et al. Diamond from the Dabie Shan metamorphic rocks and its implication for tectonic setting[J]. Science, 1992, 256: 80~82. doi: 10.1126/science.256.5053.80
[23]	徐树桐, 刘贻灿, 苏文, 等. 大别山超高压变质带面理化榴辉岩中变形石榴石的几何学和运动学特征及其大地构造意义[J]. 岩石学报, 1999, 15: 321~337. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB199903000.htm
[24]	Li S, Xiao Y, Liu D, et al. Collision of the North China and Yangtze block and formation of coesite-bearing eclogites: timing and processes[J]. Chemical Geology, 1993, 109: 89~111. doi: 10.1016/0009-2541(93)90063-O
[25]	Ames L, Tilton, G R, Zhou G. Timing of collision of the Sino-Korean and Yangtse cratons: U-Pb dating of coesitebearing eclogites[J]. Geology, 1993, 21: 339~342.
[26]	Ames L, Zhou G. Xiong B. Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze cratons, central China[J]. Tectonics, 1996, 15: 472~489. doi: 10.1029/95TC02552
[27]	Eide E A, McWilliams M O, Liou J G. ⁴⁰Ar/³⁹Ar geochronology and exhumation of high-pressure to ultrahigh-pressure metamorphic rocks in east-central China [J]. Geology, 1994, 22: 601~604.
[28]	Chavagnac V, Jahn B M. Coesite-bearing eclogites from the Bixiling complex, Dabie Mountains, China: Sm-Nd ages, geochemical characteristics and tectonic implications [J]. Chemical Geology, 1996, 133: 29~51. doi: 10.1016/S0009-2541(96)00068-X
[29]	Carswell D A, O'brien P J, Wilson R N, et al. Thermobarometry of phengite-bearing eclogites in the Dabie Mountains of central China[J]. Journal of Metamorphic Geology, 1997, 15: 239~252. doi: 10.1111/j.1525-1314.1997.00014.x
[30]	Liou J G, Zhang R Y, Jahn B M. Petrology, geochemistry and isotope data on a ultrahigh-pressure jadeite quartzite from Shuanghe, Dabie Mountains, east-central China[J]. Lithos, 1997, 41: 59~78. doi: 10.1016/S0024-4937(97)82005-1
[31]	刘景波, 国连杰, 吴颖. 豫南—鄂北大别山北部高压角闪石榴辉岩的研究[J]. 地质科学, 1997, 32: 409~422. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKX704.000.htm
[32]	Suo S, Zhong Z. Sequence of ductile shear zone in UHP metamorphic province within Dabie massif, China[J]. Journal of China University of Geosciences, 1998, 9: 189 ~195.
[33]	Henry C, Michard A, Chopin C. Geometry and structural evolution of ultra-high-pressure and high-pressure rocks from the Dora-Maira massif, Western Alps, Italy [J]. Journal of Structural Geology, 1993, 15: 965~981. doi: 10.1016/0191-8141(93)90170-F
[34]	Andersen T B, Osmundsen P T. Deep crustal fabrics and a model for the extensional collapse of the southwest Norwegian Caledonides[J]. Journal of Structural Geology, 1994, 16: 1191~1203. doi: 10.1016/0191-8141(94)90063-9
[35]	Moller C. Decompressed eclogites in the Sveconorwegian (-Grenvillian)orogen of SW Sweden: petrology and tectonic implications[J]. Journal Metamorphic Geology, 1998, 16: 641~656. doi: 10.1111/j.1525-1314.1998.00160.x
[36]	Simpson C, Schmid S. An evaluation of criteria to deduce the sense of movement in sheared rocks[J]. Geological Society of America Bulletin, 1983, 94: 1281~1288. doi: 10.1130/0016-7606(1983)94<1281:AEOCTD>2.0.CO;2
[37]	Schmid S M, Zingg A, Handy M. The kinematics of movements along the insubric line and the emplacement of the Ivrea zone[J]. Tectonophysics, 1987, 135: 47~66. doi: 10.1016/0040-1951(87)90151-X
[38]	Ellis M, Watkinson A J. Orogen-parallel extension and oblique tectonics: the relation between stretching lineations and relative plate motions[J]. Geology, 1987, 15: 1022~1026.