南秦岭铧厂沟金矿床铬云母~(40)Ar/~(39)Ar年代学及其大地构造意义
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摘要
南秦岭铧厂沟金矿床位于勉略缝合带以南的逆冲推覆带内,矿体呈透镜体或脉状产于新元古界蚀变细碧岩及泥盆系灰岩中,受控于近EW向叠瓦状逆冲断层及韧脆性剪切带。为了准确厘定其成矿时代,对矿区蚀变细碧岩型矿石和含矿石英脉中的铬云母进行了年龄测定。2件铬云母样品的~(40)Ar/~(39)Ar坪年龄分别为209.4±2.3 Ma和211.5±2.5 Ma,相应的等时线年龄211.4±3.6 Ma和215.3±3.9 Ma,与坪年龄在误差范围内一致。因此,铧厂沟金矿床的成矿年龄为212~209 Ma。结合铧厂沟金矿床的大地构造位置、矿床地质特征及成因类型,推测铧厂沟金矿床形成于扬子板块与秦岭微板块的碰撞过程,其成矿年龄代表了两板块发生碰撞的下限。
The Huachanggou gold deposit in Shaanxi province is located at the south of Mianlue Suture Zone. The ore bodies, which are mainly controlled by a series of EW trending ductile-brittle shear zones and reverse faults, are hosted in the spilite and limestone. To constrain the metallogenic age, fuchsite ~(40)Ar/~(39)Ar geochronological analyses were carried out. Two fuchsite samples from the gold bearing quartz veins and altered spilite ore yielded ~(40)Ar/~(39)Ar isotopic plateau ages of 209.4±2.3 Ma and 211.5±2.5 Ma, respectively, representing the mineralization age of gold polymetallic sulfides. By summarizing the characteristics of ore geology and the geotectonic location, it can be inferred that the Huachanggou gold deposit was formed during the collision between the Yangtze Block and Qinling micro Block which might have been took place before 209 Ma.
The Huachanggou gold deposit in Shaanxi province is located at the south of Mianlue Suture Zone. The ore bodies, which are mainly controlled by a series of EW trending ductile-brittle shear zones and reverse faults, are hosted in the spilite and limestone. To constrain the metallogenic age, fuchsite ~(40)Ar/~(39)Ar geochronological analyses were carried out. Two fuchsite samples from the gold bearing quartz veins and altered spilite ore yielded ~(40)Ar/~(39)Ar isotopic plateau ages of 209.4±2.3 Ma and 211.5±2.5 Ma, respectively, representing the mineralization age of gold polymetallic sulfides. By summarizing the characteristics of ore geology and the geotectonic location, it can be inferred that the Huachanggou gold deposit was formed during the collision between the Yangtze Block and Qinling micro Block which might have been took place before 209 Ma.
引文
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陈衍景,肖文交,张进江.2008.成矿系统:地球动力学的有效探针.中国地质,35(6):1059-1073.
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林振文,秦艳,岳素伟,周振菊,王立新.2011.陕西省铧厂沟金矿床石英脉中锆石U-Pb年代学研究.矿物学报,31(S1):614-615.
林振文,秦艳,岳素伟,周振菊,王立新,余康伟.2014.陕西省铧厂沟金矿围岩蚀变和元素迁移特征.地球化学,43(6):602-618.
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裴先治,张国伟,赖绍聪,李勇,陈亮,高明.2002.西秦岭南缘勉略构造带主要地质特征.地质通报,21(8):486-494.
魏刚锋,陈新跃,辛洪刚.2004.铧厂沟金矿床区域韧性剪切带特征.大地构造与成矿学,28(2):179-186.
杨隆勃,刘家军,王建平,杨增海,陈冬,李志国,王维钰,王立新,于康伟.2013.陕西铧厂沟金矿床成矿特征及物质来源研究.中国地质,40(4):1218-1230.
岳素伟,林振文,邓小华,李福让,何怀新,冯安国.2013.陕西省煎茶岭金矿C、H、O、S、Pb同位素地球化学示踪.大地构造与成矿学,37(4):653-670.
张复新,季军良,龙灵利,范春花.2001.南秦岭卡林型?似卡林型金矿床综合地质地球化学特征.地质论评,47(5):492-499.
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张国伟,董云鹏,赖绍聪,郭安林,孟庆任,刘少锋,程顺友,姚安平,张宗清,裴先治,李三忠.2003.秦岭?大别造山带南缘勉略构造带与勉略缝合带.中国科学(D辑),33(12):1122-1135.
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郑义,张莉,郭正林.2013.新疆铁木尔特铅锌铜矿床锆石U-Pb和黑云母40Ar-39Ar年代学及其矿床成因意义.岩石学报,29(1):191-204.
朱炳泉.1998.地球科学中同位素体系理论与应用--兼论中国大陆壳幔演化.北京:科学出版社:1-330.
Ames L,Zhou G and Xiong B.1996.Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze cratons,central China.Tectonics,15(2):472-489.
Chen Y J and Santosh M.2014.Triassic tectonics and mineral systems in the Qinling Orogen,central China.Geological Journal,49(4-5):338-358.
Dong Y P,Liu X M,Santosh M,Zhang X N,Chen Q,Yang C and Yang Z.2011.Neoproterozoic subduction tectonics of the northwestern Yangtze Block in South China:Constrains from zircon U-Pb geochronology and geochemistry of mafic intrusions in the Hannan Massif.Precambrian Research,189:66-90.
Goldfarb R J,Baker T,Dube B,Groves D I,Hart C J R and Gosselin P.2005.Distribution,character,and genesis of gold deposits in metamorphic terranes.Economic Geology 100th Anniversary Volume:407-450.
Goldfarb R J,Groves D I and Cardoll S.2001.Orogenic gold deposits:A global synthesis.Ore Geology Reviews,18:1-75.
Goldfarb R J,Newberry R J,Pickthorn W J and Gent C A.1991.Oxygen,hydrogen,and sulfur isotope studies in the Juneau gold belt,southeastern Alaska:Constraints on the origin of hydrothermal fluids.Economic Geology,86(1):66-80.
Groves D I,Goldfarb R J,Gebre-Mariam M,Hagemann Sand Robert F.1998.Orogenic gold deposits:Aproposed classification in the context of their crustal distribution and relationship to other gold deposit types.Ore Geology Reviews,13(1):7-27.
Hacker B R,Ratschbacher L,Webb L,Ireland T,Walker Dand Shuwen D.1998.U/Pb zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie Orogen,China.Earth and Planetary Science Letters,161(1):215-230.
Jiang Y H,Jin G D,Liao S Y,Zhou Q and Zhao P.2010.Geochemical and Sr-Nd-Hf isotopic constraints on the origin of Late Triassic granitoids from the Qinling orogen,central China:Implications for a continental arc to continent-continent collision.Lithos,117(1):183-197.
Koppers A.2002.Ar Ar CALC-Software for 40Ar/39Ar age calculations.Computers and Geosciences,28(5):605-619.
Li J Y,Wang Z Q and Zhao M.1999.40Ar/39Ar thermochronological constraints on the timing of collisional orogeny in the Mian?Lüe collision belt,southern Qinling mountains.Acta Geologica Sinica,73(2):208-215.
Li N,Chen Y J,Fletcher I R and Zeng Q T.2011.Triassic mineralization with Cretaceous overprint in the Dahu Au-Mo deposit,Xiaoqinling gold province:Constraints from SHRIMP monazite U-Th-Pb geochronology.Gondwana Research,20(2):543-552.
Li N,Chen Y J,Santosh M and Pirajno F.2015.Compositional polarity of Triassic granitoids in the Qinling Orogen,China:Implication for termination of the northernmost paleo-Tethys.Gondwana Research,27(1):244-257.
Liu C H,Liu J J,Wang J P,Yan L B,Wu J and Jia L.2013.Geochemical characteristics of rare earth elements and their implications for the Huachanggou gold deposit in Shaanxi Province,China.Journal of Rare Earths,31(2):215-226.
Mao J W,Qiu Y M,Goldfarb R J,Zhang Z C,Garwin S and Ren F.2002.Geology,distribution,and classification of gold deposits in the western Qinling belt,central China.Mineralium Deposita,37(3-4):352-377.
Meng Q R and Zhang G W.2000.Geologic framework and tectonic evolution of the Qinling orogen,central China.Tectonophysics,323(3-4):183-196.
Ni Z Y,Chen Y J,Li N and Zhang H.2012.Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo deposit in Qinling Orogen,central China,and implication for Triassic tectonic setting.Ore Geology Reviews,46:60-67.
Okay A I,?eng?r A and Satir M.1993.Tectonics of an ultrahigh-pressure metamorphic terrane:The Dabie Shan/Tongbai Shan Orogen,China.Tectonics,12(6):1320-1334.
Qiu H N and Wijbrans J.2008.The Paleozoic metamorphic history of the Central Orogenic Belt of China from40Ar/39Ar geochronology of eclogite garnet fluid inclusions.Earth and Planetary Science Letters,268(3):501-514.
Sun W D,Li S G,Chen Y D and Li Y J.2002.Timing of synorogenic granitoids in the South Qinling,Central China:Constraints on the evolution of the Qinling?Dabie orogenic belt.The Journal of Geology,110(4):457-468.
Van der Pluijm B A,Marshak S and Allmendinger R W.2004.Earth structure:An introduction to structural geology and tectonics.New York:WW Norton.
Zeng Q T,Mccuaig T C,Hart C J,Jourdan F,Muhling J and Bagas L.2012.Structural and geochronological studies on the Liba goldfield of the West Qinling Orogen,Central China.Mineralium Deposita,47(7):799-819.
Zhou Z J,Lin Z W and Qin Y.2014.Geology,geochemistry and genesis of the Huachanggou gold deposit,western Qinling Orogen,central China.Geological Journal,49(4-5):424-441.
陈衍景.2010.秦岭印支期构造背景、岩浆活动及成矿作用.中国地质,37(4):854-865.
陈衍景,肖文交,张进江.2008.成矿系统:地球动力学的有效探针.中国地质,35(6):1059-1073.
赖绍聪,张国伟,裴先治,杨海峰.2003.南秦岭康县?琵琶寺?南坪构造混杂带蛇绿岩与洋岛火山岩地球化学及其大地构造意义.中国科学(D辑),33(1):10-19.
李曙光,孙卫东,张国伟,陈家义,杨永成.1996.南秦岭勉略构造带黑沟峡变质火山岩的年代学和地球化学--古生代洋盆及其闭合时代的证据.中国科学(D辑),26(3):223-230.
李亚林,李三忠,张国伟.2002.秦岭勉略缝合带组成与古洋盆演化.中国地质,29(2):130-134.
林振文,秦艳,岳素伟,周振菊,王立新.2011.陕西省铧厂沟金矿床石英脉中锆石U-Pb年代学研究.矿物学报,31(S1):614-615.
林振文,秦艳,岳素伟,周振菊,王立新,余康伟.2014.陕西省铧厂沟金矿围岩蚀变和元素迁移特征.地球化学,43(6):602-618.
林振文,秦艳,周振菊,岳素伟,曾庆涛,王立新.2013.南秦岭勉略带铧厂沟火山岩锆石U-Pb年代学及地球化学研究.岩石学报,29(1):83-94.
卢欣祥,李明立,王卫,于在平,时永志.2008.秦岭造山带的印支运动及印支期成矿作用.矿床地质,27(6):762-773.
孟庆任,张国伟,于在平,梅志超.1996.秦岭南缘晚古生代裂谷--有限洋盆沉积作用及构造演化.中国科学(D辑),26(S1):30-35.
裴先治,张国伟,赖绍聪,李勇,陈亮,高明.2002.西秦岭南缘勉略构造带主要地质特征.地质通报,21(8):486-494.
魏刚锋,陈新跃,辛洪刚.2004.铧厂沟金矿床区域韧性剪切带特征.大地构造与成矿学,28(2):179-186.
杨隆勃,刘家军,王建平,杨增海,陈冬,李志国,王维钰,王立新,于康伟.2013.陕西铧厂沟金矿床成矿特征及物质来源研究.中国地质,40(4):1218-1230.
岳素伟,林振文,邓小华,李福让,何怀新,冯安国.2013.陕西省煎茶岭金矿C、H、O、S、Pb同位素地球化学示踪.大地构造与成矿学,37(4):653-670.
张复新,季军良,龙灵利,范春花.2001.南秦岭卡林型?似卡林型金矿床综合地质地球化学特征.地质论评,47(5):492-499.
张国伟.2015.秦岭勉略构造带与中国大陆构造.北京:地质出版社:1-501.
张国伟,董云鹏,赖绍聪,郭安林,孟庆任,刘少锋,程顺友,姚安平,张宗清,裴先治,李三忠.2003.秦岭?大别造山带南缘勉略构造带与勉略缝合带.中国科学(D辑),33(12):1122-1135.
张国伟,张宗清,董云鹏.1995.秦岭造山带主要构造岩石地层单元的构造性质及其大地构造意义.岩石学报,11(2):101-114.
郑义,张莉,郭正林.2013.新疆铁木尔特铅锌铜矿床锆石U-Pb和黑云母40Ar-39Ar年代学及其矿床成因意义.岩石学报,29(1):191-204.
朱炳泉.1998.地球科学中同位素体系理论与应用--兼论中国大陆壳幔演化.北京:科学出版社:1-330.
Ames L,Zhou G and Xiong B.1996.Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze cratons,central China.Tectonics,15(2):472-489.
Chen Y J and Santosh M.2014.Triassic tectonics and mineral systems in the Qinling Orogen,central China.Geological Journal,49(4-5):338-358.
Dong Y P,Liu X M,Santosh M,Zhang X N,Chen Q,Yang C and Yang Z.2011.Neoproterozoic subduction tectonics of the northwestern Yangtze Block in South China:Constrains from zircon U-Pb geochronology and geochemistry of mafic intrusions in the Hannan Massif.Precambrian Research,189:66-90.
Goldfarb R J,Baker T,Dube B,Groves D I,Hart C J R and Gosselin P.2005.Distribution,character,and genesis of gold deposits in metamorphic terranes.Economic Geology 100th Anniversary Volume:407-450.
Goldfarb R J,Groves D I and Cardoll S.2001.Orogenic gold deposits:A global synthesis.Ore Geology Reviews,18:1-75.
Goldfarb R J,Newberry R J,Pickthorn W J and Gent C A.1991.Oxygen,hydrogen,and sulfur isotope studies in the Juneau gold belt,southeastern Alaska:Constraints on the origin of hydrothermal fluids.Economic Geology,86(1):66-80.
Groves D I,Goldfarb R J,Gebre-Mariam M,Hagemann Sand Robert F.1998.Orogenic gold deposits:Aproposed classification in the context of their crustal distribution and relationship to other gold deposit types.Ore Geology Reviews,13(1):7-27.
Hacker B R,Ratschbacher L,Webb L,Ireland T,Walker Dand Shuwen D.1998.U/Pb zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie Orogen,China.Earth and Planetary Science Letters,161(1):215-230.
Jiang Y H,Jin G D,Liao S Y,Zhou Q and Zhao P.2010.Geochemical and Sr-Nd-Hf isotopic constraints on the origin of Late Triassic granitoids from the Qinling orogen,central China:Implications for a continental arc to continent-continent collision.Lithos,117(1):183-197.
Koppers A.2002.Ar Ar CALC-Software for 40Ar/39Ar age calculations.Computers and Geosciences,28(5):605-619.
Li J Y,Wang Z Q and Zhao M.1999.40Ar/39Ar thermochronological constraints on the timing of collisional orogeny in the Mian?Lüe collision belt,southern Qinling mountains.Acta Geologica Sinica,73(2):208-215.
Li N,Chen Y J,Fletcher I R and Zeng Q T.2011.Triassic mineralization with Cretaceous overprint in the Dahu Au-Mo deposit,Xiaoqinling gold province:Constraints from SHRIMP monazite U-Th-Pb geochronology.Gondwana Research,20(2):543-552.
Li N,Chen Y J,Santosh M and Pirajno F.2015.Compositional polarity of Triassic granitoids in the Qinling Orogen,China:Implication for termination of the northernmost paleo-Tethys.Gondwana Research,27(1):244-257.
Liu C H,Liu J J,Wang J P,Yan L B,Wu J and Jia L.2013.Geochemical characteristics of rare earth elements and their implications for the Huachanggou gold deposit in Shaanxi Province,China.Journal of Rare Earths,31(2):215-226.
Mao J W,Qiu Y M,Goldfarb R J,Zhang Z C,Garwin S and Ren F.2002.Geology,distribution,and classification of gold deposits in the western Qinling belt,central China.Mineralium Deposita,37(3-4):352-377.
Meng Q R and Zhang G W.2000.Geologic framework and tectonic evolution of the Qinling orogen,central China.Tectonophysics,323(3-4):183-196.
Ni Z Y,Chen Y J,Li N and Zhang H.2012.Pb-Sr-Nd isotope constraints on the fluid source of the Dahu Au-Mo deposit in Qinling Orogen,central China,and implication for Triassic tectonic setting.Ore Geology Reviews,46:60-67.
Okay A I,?eng?r A and Satir M.1993.Tectonics of an ultrahigh-pressure metamorphic terrane:The Dabie Shan/Tongbai Shan Orogen,China.Tectonics,12(6):1320-1334.
Qiu H N and Wijbrans J.2008.The Paleozoic metamorphic history of the Central Orogenic Belt of China from40Ar/39Ar geochronology of eclogite garnet fluid inclusions.Earth and Planetary Science Letters,268(3):501-514.
Sun W D,Li S G,Chen Y D and Li Y J.2002.Timing of synorogenic granitoids in the South Qinling,Central China:Constraints on the evolution of the Qinling?Dabie orogenic belt.The Journal of Geology,110(4):457-468.
Van der Pluijm B A,Marshak S and Allmendinger R W.2004.Earth structure:An introduction to structural geology and tectonics.New York:WW Norton.
Zeng Q T,Mccuaig T C,Hart C J,Jourdan F,Muhling J and Bagas L.2012.Structural and geochronological studies on the Liba goldfield of the West Qinling Orogen,Central China.Mineralium Deposita,47(7):799-819.
Zhou Z J,Lin Z W and Qin Y.2014.Geology,geochemistry and genesis of the Huachanggou gold deposit,western Qinling Orogen,central China.Geological Journal,49(4-5):424-441.