安徽池州马头铜钼矿容矿构造特征及构造应力场浅析
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摘要
研究区位于安徽池州市梅村镇西峰庙—马头平移断层东北端,该处岩体和围岩的内外接触带区域发育了一中型铜钼矿。分析了研究区铜钼矿赋存条件和容矿构造的发育特征,统计了容矿节理的产状,整理绘制出成矿期研究区的构造应力场分布图。认为研究区内的容矿节理以张性节理为主,经极射赤平投影后得到的优势产状为285°∠87°,容矿节理和主断裂产状基本一致。研究区内构造应力场最大主应力轴(σ1)的方位为15°,最小主应力轴(σ3)的方位为105°,倾角近水平。此构造应力场与燕山晚期中国东部构造应力场一致,最大主应力均为NNE—SSW方向。在此区域构造应力场的控制下,形成了区内广泛发育的NNE—SSW向、具走滑性质的断层以及张性节理。
The study area was located in the northeast end of Xifengmiao-Matou parallel displacement fault in Meixi Town of Chizhou where developed a medium-sized Cu-Mo deposit in the joint area of the rocks with the wall rock.The authors studied the occurring conditions of Cu-Mo and the developing properties of the hosting structures in the study area,depicted the occurrences of the hosting joints and the distribution of tectonic stress fields during metallogenic stage in the study area.The authors considered that the hosting joints in the study area were dominated by extension joints,the dominant occurrence obtained by stereographic polar projection was 285°∠87°,the hosting joints and main fracture occurrences were basically consistent,the maximum principal stress axis direction(σ 1) for tectonic stress field in the study area was 15°,the minimum principal stress axis direction(σ 3) was 105°,with parallel dip angle.The tectonic stress field in the study area was consistent with that in east China in late Yanshanian period,the maximum principal stress stroke NNE-SSW,and under such regional structures,NNE-SSW faults and extension joints were widely developed in the study area.
The study area was located in the northeast end of Xifengmiao-Matou parallel displacement fault in Meixi Town of Chizhou where developed a medium-sized Cu-Mo deposit in the joint area of the rocks with the wall rock.The authors studied the occurring conditions of Cu-Mo and the developing properties of the hosting structures in the study area,depicted the occurrences of the hosting joints and the distribution of tectonic stress fields during metallogenic stage in the study area.The authors considered that the hosting joints in the study area were dominated by extension joints,the dominant occurrence obtained by stereographic polar projection was 285°∠87°,the hosting joints and main fracture occurrences were basically consistent,the maximum principal stress axis direction(σ 1) for tectonic stress field in the study area was 15°,the minimum principal stress axis direction(σ 3) was 105°,with parallel dip angle.The tectonic stress field in the study area was consistent with that in east China in late Yanshanian period,the maximum principal stress stroke NNE-SSW,and under such regional structures,NNE-SSW faults and extension joints were widely developed in the study area.
引文
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赵越,张拴宏,徐刚,等.2004.燕山板内变形带侏罗纪主要构造事件[J].地质通报,23(9):854-863.
朱志澄.2004.构造地质学[M].武汉:中国地质大学出版社.
张遵忠,薛虎,陈雪,等.2009.安徽省池州市马头铜钼矿床地质地球化学特征及找矿方向研究[R].南京:华东有色地质矿产勘查开发院.
张海玲,梅芳,金明,等.2011.安徽省池州市马头铜钼多金属矿综合研究报告[R].南京:华东有色地质矿产勘查开发院.
LI S G,XIAO Y L,LIU D Y.1993.Collision of the North Chi-na and Yangtze blocks and formation of coesite-bearingeclogitae:Timing and processes[J].Chemical Geology,109:89-111.
安徽省地质矿产局.1987.安徽省区域地质志[M].北京:地质出版社.
陈国达.1978.成矿构造研究法[M].北京:地质出版社.
董胜.2006.安徽省贵池地区区域地球化学特征及找矿意义[J].物探与化探,30(3):215-219,223.
丁存根,张术根,马春,等.2009.宁镇中段矽卡岩型矿床的闪锌矿及其地质压力计应用讨论[J].地质学刊,33(2):124-129.
杜菊民,张庆龙,徐士银,等.2009.阴山晚中生代板内造山特征及其动力机制——以内蒙古大青山为例[J].地质学报,83(7):910-922.
顾连兴,徐克勤.1987.长江中、下游断裂拗陷带的构造发展与成矿作用[J].桂林冶金地质学院学报,7(4):243-251.
华东有色地质矿产勘查开发院.2010.安徽省池州市马头矿床下冲矿段铜钼矿详查地质报告[R].南京:华东有色地质矿产勘查开发院.
李盛汉.1995.安徽铜陵、贵池地区的环状航磁异常及其找矿意义[J].有色金属矿产与勘查,(4):228-232.
李相民,孙国曦,仇慎平,等.2009.安基山铜矿床地质-地球物理模型及其找矿意义[J].地质学刊,33(1):28-34.
刘超,张庆龙,葛荣峰,等.2011.山西沁水盆地东缘太行断裂构造变形特征及其成因探讨[J].地质学刊,35(2):113-122.
莫申国,韩美莲,李锦轶.2005.蒙古—鄂霍茨克造山带的组成及造山过程[J].山东科技大学学报:自然科学版,24(3):50-52,64.
任纪舜,牛宝贵,和政军,等.1997.中国东部的构造格局和动力演化[J].中国地质科学院地质矿究所文集,(29/30):43-55.
舒良树.2010.普通地质学[M].北京:地质出版社.
万天丰.1996.中国中、新生代板内变形与构造应力场[J].地质力学学报,2(3):13-15.
王伟锋,陆诗阔,金强.1999.中国大陆东部盆地构造动力学分析[J].石油大学学报:自然科学版,23(4):1-5.
徐锡伟.1990.剪切带尾端张性区构造扩展的模拟实验及其地震危险性分析[J].华北地震科学,8(3):40-46.
邢凤鸣,徐祥.1995.安徽沿江地区中生代岩浆岩的基本特点[J].岩石学报,11(4):409-422.
赵越.1994.东亚大地构造发展的重要转折[J].地质科学,29(2):105-119.
赵越,张拴宏,徐刚,等.2004.燕山板内变形带侏罗纪主要构造事件[J].地质通报,23(9):854-863.
朱志澄.2004.构造地质学[M].武汉:中国地质大学出版社.
张遵忠,薛虎,陈雪,等.2009.安徽省池州市马头铜钼矿床地质地球化学特征及找矿方向研究[R].南京:华东有色地质矿产勘查开发院.
张海玲,梅芳,金明,等.2011.安徽省池州市马头铜钼多金属矿综合研究报告[R].南京:华东有色地质矿产勘查开发院.
LI S G,XIAO Y L,LIU D Y.1993.Collision of the North Chi-na and Yangtze blocks and formation of coesite-bearingeclogitae:Timing and processes[J].Chemical Geology,109:89-111.
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