辽宁白云金矿床成矿构造与成矿结构面特征浅析
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摘要
白云金矿是辽宁省青城子矿集区大型金矿床之一,文章根据矿山资料及野外详细调查,主要对矿区的成矿构造与成矿结构面进行了梳理。成矿构造主要为成矿期活动的断裂和褶皱,利用侵入其中的含矿岩脉(石英斑岩、花岗斑岩、闪长玢岩和煌斑岩)确定成矿期断裂主要为近东西向、北西向和北东向断裂,成矿期的褶皱主要为姚家岭—天桥岭—李家堡子倒转向斜,该倒转向斜是青城子一带印支期岩浆活动形成的推覆构造形成;成矿结构面主要分为四种,即侵入岩与围岩接触面、层间断裂面或接触面、围岩断裂或裂隙面和水压致裂结构面,并从力学角度分析了这四种结构面的产生机制。最后,讨论了在强烈的由南向北挤压应力作用下,含矿热液沿不同的张性裂隙侵位形成不同矿体样式。
The Baiyun gold deposit is one of the largest ore deposits in the Qingchengzi ore concentrated area,Liaoning. Characteristics of metallotectonics and ore-forming structural planes have been studied comprehensively,based on mineral exploration data and field investigation. Active fractures and folds in ore-forming period become the metalotectonic structures. Fractures can be divided into EW-,NW-and NE-ward fractures based on the injected dikes( such as quartz porphyry,granite porphyry,diorite porphyrite and lamprophyre),and fold is the Yaojialing-Tianqiaoling-Lijiapuzi inverted syncline formed by the thrust derived from Indosinian magmatic activities in Qingchengzi area. Ore-forming structural planes can be divided into four types, namely the contact interface between intrusive rock and surrounding rock,interlayer fracture and lithologic contact interface in the stratum,rock fracture or fissure planes and hydraulic fracturing structure planes. Moreover, formation mechanism of these structural planes was discussed. Finally,it is summarized that ore-bearing hydrothermal fluids flowed along different tensile fracture and formed different ore body patterns under the intense pressure from the south to the north.
The Baiyun gold deposit is one of the largest ore deposits in the Qingchengzi ore concentrated area,Liaoning. Characteristics of metallotectonics and ore-forming structural planes have been studied comprehensively,based on mineral exploration data and field investigation. Active fractures and folds in ore-forming period become the metalotectonic structures. Fractures can be divided into EW-,NW-and NE-ward fractures based on the injected dikes( such as quartz porphyry,granite porphyry,diorite porphyrite and lamprophyre),and fold is the Yaojialing-Tianqiaoling-Lijiapuzi inverted syncline formed by the thrust derived from Indosinian magmatic activities in Qingchengzi area. Ore-forming structural planes can be divided into four types, namely the contact interface between intrusive rock and surrounding rock,interlayer fracture and lithologic contact interface in the stratum,rock fracture or fissure planes and hydraulic fracturing structure planes. Moreover, formation mechanism of these structural planes was discussed. Finally,it is summarized that ore-bearing hydrothermal fluids flowed along different tensile fracture and formed different ore body patterns under the intense pressure from the south to the north.
引文
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[4]杨振升,刘俊来.辽东早元古宙变质岩系中的一个推覆构造---青城子褶皱推覆构造[J].长春地质学院学报,1989,19(2):121-129.YANG Zhensheng,LIU Junlai.Nappe tectonics in the Proterozoic complexes in Liaodong Peninsula,China---An example of fold-nappe from Qingchengzi[J].Journal of Changchun University of Earth Science,1989,19(2):121-129.(in Chinese with English abstract)
[5]张宝华,屈奋雄,张鹏程,等.论韧性剪切带对金矿的控制规律---以辽宁省白云金矿为例[J].地质找矿论丛,1996,11(1):8-17.ZHANG Baohua,QU Fenxiong,ZHANG Pengcheng,et al.The control of ductile shear zones on gold mineralization---an example from Baiyun gold deposit,Liaoning Province[J].Contribution to Geology and Mineral Resources Research,1996,11(1):8-17.(in Chinese with English abstract)
[6]杨新库.对辽宁白云金矿床地质特征及深部找矿的新认识[J].地质与资源,2011,20(2):111-114.YANG Xinku.The new understanding to the geologic characteristics and deep exploration of the Baiyun gold deposit in Liaoning Province[J].Geology and Resources,2011,20(2):111-114.(in Chinese with English abstract)
[7]王富春.辽宁白云金矿床的控矿构造特征[J].黄金,2002,23(5):4-7.WANG Fuchun.The tectonic characteristics of Baiyun gold deposit,Liaoning Province[J].Gold,2002,23(5):4-7.(in Chinese with English abstract)
[8]刘俊来.韧性剪切带中含金石英脉的就位机制[J].吉林地质,1993,12(3):16-23.LIU Junlai.The emplacement mechanism of auriferous quartz in the ductile shear zones[J].Jilin Geology,1993,12(3):16-23.(in Chinese with English abstract)
[9]YU G,CHEN J F,XUE C J,et al.Geochronological framework and Pb,Sr isotope geochemistry of the Qingchengzi Pb-Zn-Ag-Au orefield,Northeastern China[J].Ore Geology Reviews,2009,35(3-4):367-382.
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[11]骆辉,李俊建.辽东裂谷Au、Ag、Pb、Zn、Cu、Co金属矿床地质特征和成矿条件[J].前寒武纪研究进展,2002,25(3-4):240-245.LUO Hui,LI Junjian.Geological features of Au,Ag,Pb,Zn,Cu and Co ore deposits and its forming conditions in the Eastern region of Liaoning Province,China[J].Progress in Precambrian Research,2002,25(3-4):240-245.(in Chinese with English abstract)
[12]CHEN Y J,GUO G J,LI X.Metallogenic geodynamic background of Mesozoic gold deposits in granite-greenstone terrains of North China Craton[J].Science in China Series D:Earth Sciences,1998,41(2):113-120.
[13]李三忠,刘建忠,赵国春,等.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.LI Sanzhong,LIU Jianzhong,ZHAO Guochun,et al.Key geochronology of Mesozoic deformation in the eastern block of the North China Craton and its constraints on regional tectonics:a case of Jiaodong and Liaodong Peninsula[J].Acta Petrologica Sinica,2004,20(3):633-646.(in Chinese with English abstract)
[14]李德东,王玉往,周国超,等.辽宁白云金矿区岩脉与成矿作用浅谈[J].矿产勘查,2016,7(1):113-119.LI Dedong,WANG Yuwang,ZHOU Guochao,et al.Preliminary analysis of the relationship between dikes and gold mineralization in Baiyun gold deposit,Liaoning[J].Mineral Exploration,2016,7(1):113-119.(in Chinese with English abstract)
[15]张朋,李斌,李杰,等.辽东裂谷白云金矿载金黄铁矿ReOs定年及其地质意义[J].大地构造与成矿学,2016,40(4):731-738.ZHANG Peng,LI Bin,LI Jie,et al.Re-Os isotopic dating and its geological implication of gold bearing pyrite from the Baiyun gold deposit in Liaodong rift[J].Geotectonica et Metallogenia,2016,40(4):731-738.(in Chinese with English abstract)
[16]周国超,王玉往,李德东,等.辽东白云金矿区脉岩锆石的U-Pb年代学研究[J].矿物岩石地球化学通报,2017,36(4):620-627.ZHOU Guochao,WANG Yuwang,LI Dedong,et al.LA-ICP-MS zircon U-Pb dating of dykes from the Baiyun gold deposit in Eastern Liaoning[J].Bulletin of Mineralogy,Petrology and Geochemistry,2017,36(4):620-627.(in Chinese with English abstract)
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[18]张朋,赵岩,寇林林,等.辽东青城子矿田煌斑岩锆石U-Pb年龄及其地质意义[J].东北大学学报(自然科学版),2016,37(7):1056-1060.ZHANG Peng,ZHAO Yan,KOU Linlin,et al.Zircon U-Pb dating and its geological significance of lamprophyres from Qingchengzi orefield,Liaodong[J].Journal of Northeastern University(Natural Science),2016,37(7):1056-1060.(in Chinese with English abstract)
[19]耿国建,马宝军,丛颖,等.辽宁青城子逆冲推覆构造变形与金矿控矿作用探讨[J].黄金科学技术,2016,24(4):26-31.GENG Guojian,MA Baojun,CONG Ying,et al.Discussion on the Thrust Nappe structure deformation of Qingchengzi and gold ore-controlling,Liaoning Province[J].Gold Science and Technology,2016,24(4):26-31.(in Chinese with English abstract)
[20]DUAN X X,ZENG Q D,YANG J H,et al.Geochronology,geochemistry and Hf isotope of Late Triassic magmatic rocks of Qingchengzi district in Liaodong peninsula,Northeast China[J].Journal of Asian Earth Sciences,2014,91:107-124.
[21]LIU F L,WANG F,LIOU J G,et al.Mid-Late Triassic metamorphic event for Changhai meta-sedimentary rocks from the SE Jiao-Liao-Ji Belt,North China Craton:Evidence from monazite U-Th-Pb and muscovite Ar-Ar dating[J].Journal of Asian Earth Sciences,2014,94:205-225.
[22]徐英奎.论辽宁凤城白云金矿床动力成矿作用[J].中国地质科学院沈阳地质矿产研究所所刊,1991,23:79-88.XU Yingkui.The origin of gold ore deposits in Fengcheng county,Liaoning Province[J].Bulletin of Shenyang Institute of Geological and Mineral Resources,Chinese Academy of Geological Sciences,1991,23:79-88.(in Chinese with English abstract)
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