湘南江永地区多期褶皱的变形特征及叠加关系
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摘要
湘南江永地区处于华夏陆块西北缘,自早古生代以来经历了多期构造变形,关于这些变形的研究对探索湘南地区及其邻区的构造演化过程具有重要意义。通过对江永地区古生界褶皱的构造要素测量和褶皱叠加关系的解析,识别出了3期4个方向的褶皱构造,按发育早晚顺序分别为第一期(D_1)NE向褶皱,第二期(D_2)NNE-近SN向褶皱、NW向褶皱,第三期(D_3)近EW向褶皱。其中D_1期NE向褶皱为下古生界独有的构造样式,本区及邻区上古生界仅记录了后2期(D_2和D_3)3个方向的褶皱作用。结合地层接触关系、岩浆活动及区域构造演化的综合分析,3期褶皱作用分别对应早古生代后期加里东陆内造山运动NW向挤压、中三叠世后期印支运动NWW向挤压以及晚三叠世-早侏罗世近SN向挤压等构造事件。
Jinagyong area is located in the northwest margin of the Cathaysian Block and has undergone multi-stage structural deformations since the Early Paleozoic. Research on these deformations is crucial for a better understanding of the tectonic evolution along and adjacent to southern Hunan. Based on statistical analysis of structural factors and superposed relationship of folds in Paleozoic in Jiangyong area, three phases and four directions of folds are identified in this research, namely the first stage(D_1) NE trending folds, the second stage(D_2) NNE-SN trending and NW trending folds, and the third stage(D_3) EW trending folds. The first stage NE trending folds are of unique structural style of the Lower Paleozoic, while only the last two stages of folding in three directions are recorded in the Upper Paleozoic in Jiangyong area and its adjacent areas. Combining with the stratigraphic contact relationship, magmatic activity and regional tectonic evolution, this paper suggests that the three phases of folding correspond to the NW trending compression of the Caledonian intracontinental orogenic movement in the late Early Paleozoic, the NWW trending compression of the Indosinian movement in the late Middle Triassic and SN trending compression events during the Late Triassic to Early Jurassic, respectively.
Jinagyong area is located in the northwest margin of the Cathaysian Block and has undergone multi-stage structural deformations since the Early Paleozoic. Research on these deformations is crucial for a better understanding of the tectonic evolution along and adjacent to southern Hunan. Based on statistical analysis of structural factors and superposed relationship of folds in Paleozoic in Jiangyong area, three phases and four directions of folds are identified in this research, namely the first stage(D_1) NE trending folds, the second stage(D_2) NNE-SN trending and NW trending folds, and the third stage(D_3) EW trending folds. The first stage NE trending folds are of unique structural style of the Lower Paleozoic, while only the last two stages of folding in three directions are recorded in the Upper Paleozoic in Jiangyong area and its adjacent areas. Combining with the stratigraphic contact relationship, magmatic activity and regional tectonic evolution, this paper suggests that the three phases of folding correspond to the NW trending compression of the Caledonian intracontinental orogenic movement in the late Early Paleozoic, the NWW trending compression of the Indosinian movement in the late Middle Triassic and SN trending compression events during the Late Triassic to Early Jurassic, respectively.
引文
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[29] 陈旭,戎嘉余.从生物地层学到大地构造学:以华南奥陶系和志留系为例[J].现代地质,1999,13(4):385-389.
[30] 丘元禧,张渝昌,马文璞.雪峰山陆内造山带的构造特征与演化[J].高校地质学报,1998,4(4):432-443.
[31] 丘元禧,张渝昌,马文璞.雪峰山的构造性质与演化:一个陆內造山带的型成演化模式[M].北京:地质出版社,1999.
[32] 杜远生,徐亚军.华南加里东运动初探[J].地质科技情报,2012,31(5):43-49.
[33] 徐亚军,杜远生.从板缘碰撞到陆内造山:华南东南缘早古生代造山作用演化[J].地球科学,2018,43(2):333-353.
[34] 李四光.地质力学之基础与方法[M].上海:中华书局,1945.
[35] 傅昭仁,李紫金,郑大瑜.湘赣边区NNE向走滑造山带构造发展样式[J].地学前缘,1999,6(4):263-272.
[36] 万天丰,朱鸿.中国大陆及邻区中生代-新生代大地构造与环境变迁[J].现代地质,2002,16(2):107-118.
[37] 柏道远,钟响,贾朋远,等.湘东南晚三叠世-侏罗纪沉积特征及盆地性质和成因机制[J].地质力学学报,2011,17(4):338-349.
[38] 舒良树,周新民.中国东南部晚中生代构造作用[J].地质论评,2002,48(3):249-260.
[39] 舒良树,周新民,邓平,等.中国东南部中、新生代盆地特征与构造演化[J].地质通报,2004,23(9/10):876-884.
[2] 柏道远,贾宝华,钟响,等.湘中南晋宁期和加里东期构造线走向变化成因[J].地质力学学报,2012,18(2):165-177.
[3] 崔盛芹,李锦蓉.试论中国滨太平洋带的印支运动[J].地质学报,1983,57(1):51-61.
[4] 任纪舜.印支运动及其在中国大地构造演化中的意义[J].地球学报,1984,6(2):31-44.
[5] 李武显,周新民.中国东南部晚中生代俯冲带探索[J].高校地质学报,1999,5(2):164-169.
[6] Li Z X,Li X H.Formation of the 1 300 km-wide intracontinental orogen and postorogenic magmatic province in Mesozoic South China:A flat-slab subduction model[J].Geology,2007,35(2):179-182.
[7] Li X H,Li Z X,Li W X,et al.Initiation of Indosinian orogeny in South China:Evidence for a Permian magmatic arc on Hainan Island[J].The Journal of Geology,2006,114(3):341-353.
[8] 柏道远,贾宝华,钟响,等.湘东南印支运动变形特征研究[J].地质论评,2012,58(1):19-28.
[9] 郭福祥.中国南方中新生代大地构造属性和南华造山带褶皱过程[J].地质学报,1998,72(1):22-33.
[10] 李武显,周新民.古太平洋岩石圈消减与中国东南部晚中生代火成岩成因:岩石圈消减与玄武岩底侵相结合模式的补充证据[J].大地构造与成矿学,2001,25(1):55-63.
[11] Yan D P,Zhou M F,Song H L,et al.Origin and tectonic significance of a Mesozoic multi-layer over-thrust system within the Yangtze Block (South China)[J].Tectonophysics,2003,361(3/4):239-254.
[12] 董树文,张岳桥,龙长兴,等.中国侏罗纪构造变革与燕山运动新诠释[J].地质学报,2007,81(11):1449-1461.
[13] 徐先兵,张岳桥,贾东,等.华南早中生代大地构造过程[J].中国地质,2009,36(3):573-593.
[14] 张岳桥,徐先兵,贾东,等.华南早中生代从印支期碰撞构造体系向燕山期俯冲构造体系转换的形变记录[J].地学前缘,2009,16(1):234-247.
[15] 乐光禹,杜思清,黄继钧,等.构造复合联合原理:川黔构造组合叠加分析[M].成都:成都科技大学出版社,1996.
[16] 刘耀荣,贺春平,刘富国,等.都庞岭岩体环斑花岗岩的特征[J].华南地质与矿产,2003,19(2):23-29.
[17] 湖南省地质调查院.中国区域地质志·湖南志[M].北京:地质出版社,2017.
[18] Simón J L.Superposed buckle folding in the eastern Iberian Chain,Spain[J].Journal of Structural Geology,2004,26(8):1447-1464.
[19] Thiessen R L,Means W D.Classification of fold interference patterns:A reexamination[J].Journal of Structural Geology,1980,2(3):311-316.
[20] Ramsay J G,Huber M I.The techniques of modern structural geology.Vol.2:Folds and fractures[M].London:Academic Press,1987:475-501.
[21] Ghosh S K,Mandal N,Khan D,et al.Modes of superposed buckling in single layers controlled by initial tightness of early folds[J].Journal of Structural Geology,1992,14(4):381-394.
[22] Ghosh S K,Mandal N,Sengupta S,et al.Superposed buckling in multilayers[J].Journal of Structural Geology,1993,15(1):95-111.
[23] 孙东,刘树根,邓宾,等.米仓山与龙门山接合部叠加褶皱特征及构造演化[J].成都理工大学学报:自然科学版,2011,38(2):156-168.
[24] 柏道远,钟响,贾朋远,等.雪峰造山带及邻区构造变形和构造演化研究新进展[J].华南地质与矿产,2015,31(4):321-343.
[25] 程顺波,付建明,徐德明,等.桂东北大宁岩体锆石SHRIMP年代学和地球化学研究[J].中国地质,2009,36(6):1278-1288.
[26] 柏道远,陈必河,钟响,等.湘西南兰蓉岩体锆石SHRIMP U-Pb年龄、地球化学特征及构造背景[J].资源调查与环境,2014,35(2):95-105.
[27] 柏道远,钟响,贾朋远,等.南岭西段加里东期越城岭岩体锆石SHRIMP U-Pb年龄、地质地球化学特征及其形成构造背景[J].地球化学,2015,44(1):27-42.
[28] 柏道远,钟响,贾朋远,等.南岭西段加里东期苗儿山岩体锆石SHRIMP U-Pb年龄、地球化学特征及其构造意义[J].岩石矿物学杂志,2014,33(3):407-423.
[29] 陈旭,戎嘉余.从生物地层学到大地构造学:以华南奥陶系和志留系为例[J].现代地质,1999,13(4):385-389.
[30] 丘元禧,张渝昌,马文璞.雪峰山陆内造山带的构造特征与演化[J].高校地质学报,1998,4(4):432-443.
[31] 丘元禧,张渝昌,马文璞.雪峰山的构造性质与演化:一个陆內造山带的型成演化模式[M].北京:地质出版社,1999.
[32] 杜远生,徐亚军.华南加里东运动初探[J].地质科技情报,2012,31(5):43-49.
[33] 徐亚军,杜远生.从板缘碰撞到陆内造山:华南东南缘早古生代造山作用演化[J].地球科学,2018,43(2):333-353.
[34] 李四光.地质力学之基础与方法[M].上海:中华书局,1945.
[35] 傅昭仁,李紫金,郑大瑜.湘赣边区NNE向走滑造山带构造发展样式[J].地学前缘,1999,6(4):263-272.
[36] 万天丰,朱鸿.中国大陆及邻区中生代-新生代大地构造与环境变迁[J].现代地质,2002,16(2):107-118.
[37] 柏道远,钟响,贾朋远,等.湘东南晚三叠世-侏罗纪沉积特征及盆地性质和成因机制[J].地质力学学报,2011,17(4):338-349.
[38] 舒良树,周新民.中国东南部晚中生代构造作用[J].地质论评,2002,48(3):249-260.
[39] 舒良树,周新民,邓平,等.中国东南部中、新生代盆地特征与构造演化[J].地质通报,2004,23(9/10):876-884.