安徽金寨银山钼-铅-锌多金属矿床Re-Os和有关岩浆岩~(40)Ar-~(39)Ar年龄测定
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摘要
近年,在安徽金寨银山地区,发现了钼-铅-锌多金属矿床,赋矿岩石为中酸性岩浆岩。岩浆岩中的黑云母和角闪石单矿物的40Ar-39Ar同位素地质年龄测定表明,矿区内的中粒二长花岗岩、细粒二长花岗岩和细晶闪长岩脉分别形成于(136.8±1.6)Ma、(130.4±1.2)Ma和(125.4±1.0)Ma,为燕山晚期早白垩世侵入岩。根据岩体产状和接触关系,赋矿石英正长(斑)岩和爆发角砾岩的形成晚于二长花岗岩和细晶闪长岩脉。矿区内,钼矿体和铅锌矿体主要呈脉状产于不同岩性的岩浆岩体中,钼矿体主要发育于爆发角砾岩中心附近的石英正长斑岩中,铅锌矿体则主要赋存在二长花岗岩体中。钼矿床中辉钼矿的Re-Os同位素模式年龄为(112.6±1.3)Ma和(113.5±1.3)Ma。根据矿体与岩浆岩的相互关系以及同位素地质年龄测定,矿区内的钼-铅-锌多金属矿床与石英正长斑岩的形成时间接近,成矿与浅成-超浅成偏碱性岩浆的侵入和相关的热液作用有关,属于斑岩-隐爆角砾岩型矿床。结合前人的研究成果,笔者认为:该区的岩浆岩和钼-多金属矿床形成于中国东部大规模岩石圈减薄、拆沉和热侵蚀的地球动力学背景,大别造山带应力场由挤压转化至伸展阶段以后;区内的钼-多金属矿床归属东秦岭-大别钼成矿带的东延部分,是中国东部EW向大规模成矿带的组成部分。
In recent years, molybdenum-lead-zinc polymetallic deposits were discovered in Yinshan area, Jinzhai, Anhui Province. The ore bodies are hosted mainly in Yanshanian magmatic rocks. Dating results of 40Ar/39Ar isotopic ages of biotite and hornblende in magmatic rocks show that medium-grained adamellite, fine-grained adamellite and fine-granined diorite in the ore district were formed respectively in (136.8±1.6) Ma, (130.4±1.2) Ma and (125.4±1.0) Ma, suggesting that they are Early Cretaceous products formed during late Yanshanian movement. According to their attitudes and relationship, quartz-syenite (porphyry) and explosion-breccia were formed later than adamellite and diorite. Regional magmatism evolved from high potassium calc-alkaline to alkaline. Molybdenum and lead-zinc deposits occur in the veined form in different lithologic magmatic rocks, and molybdenum deposits mainly occur in quartz syenite (porphyry) distributed in the center of explosion-breccia. The Re-Os isotopic model ages of molybdenite in molybdenum deposits are (112.6±1.3) Ma and (113.5±1.3) Ma, which are considered to be the ages of regional molybdenum deposits. Geological characteristics and isotopic ages show that the molybdenum-lead-zinc polymetallic deposits may genetically related to the emplacement and hydrothermal activities of the late stage quartz syenite (porphyry). These deposits should thus belong to shallow-seated or ultra-shallow-seated porphyry-explosion-breccia deposits. In combination with the achievements made by previous researchers, the authors hold that the molybdenum-lead-zinc polymetallic deposits and related magmatic rocks were formed in a geodynamic setting of regional large-scale lithospheric thinning, delamination and thermal erosion in East China, and also in a regional stress field formed during the conversion of the Dabie orogenic belt to the extension stage. The molybdenum polymetallic deposits are controlled by the EW-trending structures, and belong to the East Qinling-Dabie molybdenum belt, a part of the larger EW-trending metallogenic belt in eastern China.
In recent years, molybdenum-lead-zinc polymetallic deposits were discovered in Yinshan area, Jinzhai, Anhui Province. The ore bodies are hosted mainly in Yanshanian magmatic rocks. Dating results of 40Ar/39Ar isotopic ages of biotite and hornblende in magmatic rocks show that medium-grained adamellite, fine-grained adamellite and fine-granined diorite in the ore district were formed respectively in (136.8±1.6) Ma, (130.4±1.2) Ma and (125.4±1.0) Ma, suggesting that they are Early Cretaceous products formed during late Yanshanian movement. According to their attitudes and relationship, quartz-syenite (porphyry) and explosion-breccia were formed later than adamellite and diorite. Regional magmatism evolved from high potassium calc-alkaline to alkaline. Molybdenum and lead-zinc deposits occur in the veined form in different lithologic magmatic rocks, and molybdenum deposits mainly occur in quartz syenite (porphyry) distributed in the center of explosion-breccia. The Re-Os isotopic model ages of molybdenite in molybdenum deposits are (112.6±1.3) Ma and (113.5±1.3) Ma, which are considered to be the ages of regional molybdenum deposits. Geological characteristics and isotopic ages show that the molybdenum-lead-zinc polymetallic deposits may genetically related to the emplacement and hydrothermal activities of the late stage quartz syenite (porphyry). These deposits should thus belong to shallow-seated or ultra-shallow-seated porphyry-explosion-breccia deposits. In combination with the achievements made by previous researchers, the authors hold that the molybdenum-lead-zinc polymetallic deposits and related magmatic rocks were formed in a geodynamic setting of regional large-scale lithospheric thinning, delamination and thermal erosion in East China, and also in a regional stress field formed during the conversion of the Dabie orogenic belt to the extension stage. The molybdenum polymetallic deposits are controlled by the EW-trending structures, and belong to the East Qinling-Dabie molybdenum belt, a part of the larger EW-trending metallogenic belt in eastern China.
引文
①河南地质调查三队.1993.桐柏-大别造山带(北坡)金矿地质、地球物理、地球化学找矿模型、评价指标的研究及预测.内部资料.
②中国地质大学.1995.河南省大别山北坡金银及多金属矿成矿地质条件及成矿预测.内部资料.
③安徽省地质矿产局313地质队.1992.安徽省金寨地区浅变质岩系金、多金属矿产成矿与找矿预测.内部资料.
①安徽省地质矿产局313地质队.1992.安徽省金寨地区浅变质岩系金、多金属矿产成矿与找矿预测.内部资料.
②陆三明,彭海辉,王波华.2001.安徽省金寨县鲜花岭-银山地区铅锌矿普查地质报告.内部资料.
③河南地质调查三队.1993.桐柏-大别造山带(北坡)金矿地质、地球物理、地球化学找矿模型、评价指标的研究及预测.内部资料.
④河南省地质矿产厅区调队.1994.中华人民共和国区域地质调查报告,1∶5万商城幅、达权店幅.
①安徽省地质矿产局313地质队.2000.中华人民共和国区域地质调查报告.1∶5万南溪幅、七邻幅.
①安徽省地质矿产局313地质队.2000.中华人民共和国区域地质调查报告,1∶5万南溪幅、七邻幅.
②陆三明,彭海辉,王波华.2001.安徽省金寨县鲜花岭-银山地区铅锌矿普查地质报告.内部资料.
③河南省地质矿产厅区调队.1980.中华人民共和国区域地质调查报告,1∶20万商城幅.
④河南省地质矿产厅区调队.1994.中华人民共和国区域地质调查报告,1∶5万商城幅、达权店幅.
Chen W,Liu X Y and Zhang S H.2002.Continuous laser stepwiseheating40Ar/39Ar dating technique[J].Geological Review,48(Suppl):127-134(in Chinese).
Du A D,He HL,Yin N W,Zou X Q,Sun Y L,Sun D Z,Chen S Zand Qu WJ.1994.Astudy onthe rhenium-osmiumgeochronometry of molybdenites[J].Acta Geologica Sinica,68(4):339-347(in Chinese with English abstract).
Du J G.2000.Onthe Mesozoic magmatismand geochemistry of miner-alizationin Dabie orogenic belt(dissertationfor doctor degree)[D].Hefei:Hefei University of Technology.176p(in Chinese).
Du J G,Zhang P and Jiang J F.1996.The division and comparison ofthe Beihuayang tectonic facies belt,Anhui[J].Geology of Anhui,6(1):19-27(in Chinese with English abstract).
Gao S,Zhang B R,Jin Z Mand Kern H.1999.Lower crustal delamina-tioninthe Qinling-Dabie orogenic belt[J].Sciencein China(SeriesD),42(4):423-433(in Chinese).
Gao T C.1993.Metallogenic model for the gold deposits in Tongbais-han-Dabieshan ductile shear,Henan province[J].Henan Geology,11(3):161-168(in Chinese).
Hacker B R,Ratschbacher L,Webb L,Ireland T,Walker Dand DongS.1998.U/Pb zircon ages constrain the architecture of the ultra-high-pressure Qinling-Dabie Orogen,China[J].Earth Planet.Sci.Lett.,161:215-230.
Li FJ,Wang C Q,Bai FJ and Song Y L.2004.Re-Osisotopic ages ofMo deposits in East Qinling and their geodynamic settings[J].Mineral Resources and Geology,18(6):571-577(in Chinese withEnglish abstract).
Li S G,Jagoutz E,Chen YZand Li QL.2000.Sm-Nd and Rb-Sriso-topic chronology and cooling history of ultrahigh pressure metamor-phic rocks andtheir country rocks at Shuangheinthe Dabie Moun-tains,Central China[J].Geochi mica et Cosmochi mica Acta,64(6):1077-1093.
Lu S M,Xu X C and Peng Z.2005.Geologic feature and genesis ofmulti-metal deposit of crypto-explosion breccia type in the east partof north Huaiyang tectonic zone[J].Geology and Prospecting,41(3):7-11(in Chinese with English abstract).
Mao J W,Xie G Q,Bierlein F,et al.2008.Tectonic i mplications fromRe-Os dating of Mesozoic molybdenumdepositsin East Qinling-Di-abie orogenic belt[J].Geochi mica et Cosmochi mica Acta,72:4607-4626.
Okay AI,Xu S and Sengor A MC.1989.Coesite fromthe Dabieshaneclogites,central China[J].Eur.J.Mineral.,1:595-598.
Peng Z,Lu S Mand Xu X C.2005.Regional metallogenic regularitiesof the gold-polymetallic deposits in eastern part of north Huaiyangtectonic zone[J].Journal of Hefei University of Technology,28(4):364-368(in Chinese with English abstract).
Qu WJ and Du A D.2003.Highly precise Re-Os dating of molybdeniteby ICP-MS with Carius tube sample digestion[J].Rock andMineral Analysis,22(4):254-257(in Chinese with Englishabstract).
Wang S S,He J H,Li R Mand Zhao D Z.1979.Note onisotope dilu-tion method for K-Ar dating[J].Chinese Jour.Geol.(formerly,Scientia Geologica Sinica),(2):139-150(in Chinese).
Xu S T,Liu Y C,Jiang L L,Wu WPand Chen G B.2002.Architectureand kinematics of the Dabie mountains orogen[M].Hefei:Press ofUniversity of Science and Technology of China(in Chinese).
Yang Z Q.2007.Re-Os isotopic ages of Tangjiaping molybdenum de-posit in Shangcheng County,Henan andtheir geological significance[J].Mineral Deposits,26(3):289-295(in Chinese with Englishabstract).
Zhong Z Q,Suo S T,Zhang HF and Zhou H W.2001.Major con-stituents and texture of the Tongbai-Daibie collisional orogenic belt[J].Earth Science,26(6):560-567(in Chinese with Englishab-stract).
陈文,刘新宇,张思红.2002.连续激光阶段升温40Ar/39Ar地质年代测定方法研究[J].地质论评,48(增刊):127-134.
杜安道,何红蓼,殷宁万,邹晓秋,孙亚利,孙德忠,陈少珍,屈文俊.1994.辉钼矿的铼-锇同位素地质年龄测定方法研究[J].地质学报,68(4):339-347.
杜建国.2000.大别造山带中生代岩浆作用与成矿地球化学(博士论文)[D].合肥:合肥工业大学.1-176.
杜建国,张鹏,姜俊峰.1996.安徽北淮阳构造岩相带的划分与对比[J].安徽地质,6(1):19-27.
高山,张本仁,金振民,Kern H.1999.秦岭-大别造山带下地壳拆沉作用[J].中国科学,29(6):532-541.
高廷臣.1993.河南桐柏山-大别山地区韧性剪切带成金模式[J].河南地质,11(3):161-168.
李永峰,王春秋,白凤军,宋艳玲.2004.东秦岭钼矿Re-Os同位素年龄及其成矿动力学背景[J].矿产与地质,18(6):571-578
陆三明,徐晓春,彭智.2005.北淮阳构造带东段隐爆角砾岩型多金属矿床的地质特征及成因[J].地质与勘探,41(3):7-11.
彭智,陆三明,徐晓春.2005.北淮阳构造带东段金-多金属矿床区域成矿规律[J].合肥工业大学学报,28(4):364-368.
屈文俊,杜安道.2003.高温密闭溶样电感耦合等离子体质谱准确测定辉钼矿铼-锇地质年龄[J].岩矿测试,22(4):254-257.
王松山,何娟华,李若梅,赵东植.1979.测定地质年代的钾-氩稀释法[J].地质科学,(2):139-150.
徐树桐,刘贻灿,江来利,吴维平,陈冠宝.2002.大别造山带的构造几何学和运动学[M].合肥:中国科学技术大学出版社.
杨泽强.2007.河南商城县汤家坪钼矿辉钼矿铼-锇同位素地质年龄及地质意义[J].矿床地质,26(3):289-295.
钟增球,索书田,张宏飞,周汉文.2001.桐柏-大别碰撞造山带的基本组成与结构[J].地球科学,26(6):560-567.
②中国地质大学.1995.河南省大别山北坡金银及多金属矿成矿地质条件及成矿预测.内部资料.
③安徽省地质矿产局313地质队.1992.安徽省金寨地区浅变质岩系金、多金属矿产成矿与找矿预测.内部资料.
①安徽省地质矿产局313地质队.1992.安徽省金寨地区浅变质岩系金、多金属矿产成矿与找矿预测.内部资料.
②陆三明,彭海辉,王波华.2001.安徽省金寨县鲜花岭-银山地区铅锌矿普查地质报告.内部资料.
③河南地质调查三队.1993.桐柏-大别造山带(北坡)金矿地质、地球物理、地球化学找矿模型、评价指标的研究及预测.内部资料.
④河南省地质矿产厅区调队.1994.中华人民共和国区域地质调查报告,1∶5万商城幅、达权店幅.
①安徽省地质矿产局313地质队.2000.中华人民共和国区域地质调查报告.1∶5万南溪幅、七邻幅.
①安徽省地质矿产局313地质队.2000.中华人民共和国区域地质调查报告,1∶5万南溪幅、七邻幅.
②陆三明,彭海辉,王波华.2001.安徽省金寨县鲜花岭-银山地区铅锌矿普查地质报告.内部资料.
③河南省地质矿产厅区调队.1980.中华人民共和国区域地质调查报告,1∶20万商城幅.
④河南省地质矿产厅区调队.1994.中华人民共和国区域地质调查报告,1∶5万商城幅、达权店幅.
Chen W,Liu X Y and Zhang S H.2002.Continuous laser stepwiseheating40Ar/39Ar dating technique[J].Geological Review,48(Suppl):127-134(in Chinese).
Du A D,He HL,Yin N W,Zou X Q,Sun Y L,Sun D Z,Chen S Zand Qu WJ.1994.Astudy onthe rhenium-osmiumgeochronometry of molybdenites[J].Acta Geologica Sinica,68(4):339-347(in Chinese with English abstract).
Du J G.2000.Onthe Mesozoic magmatismand geochemistry of miner-alizationin Dabie orogenic belt(dissertationfor doctor degree)[D].Hefei:Hefei University of Technology.176p(in Chinese).
Du J G,Zhang P and Jiang J F.1996.The division and comparison ofthe Beihuayang tectonic facies belt,Anhui[J].Geology of Anhui,6(1):19-27(in Chinese with English abstract).
Gao S,Zhang B R,Jin Z Mand Kern H.1999.Lower crustal delamina-tioninthe Qinling-Dabie orogenic belt[J].Sciencein China(SeriesD),42(4):423-433(in Chinese).
Gao T C.1993.Metallogenic model for the gold deposits in Tongbais-han-Dabieshan ductile shear,Henan province[J].Henan Geology,11(3):161-168(in Chinese).
Hacker B R,Ratschbacher L,Webb L,Ireland T,Walker Dand DongS.1998.U/Pb zircon ages constrain the architecture of the ultra-high-pressure Qinling-Dabie Orogen,China[J].Earth Planet.Sci.Lett.,161:215-230.
Li FJ,Wang C Q,Bai FJ and Song Y L.2004.Re-Osisotopic ages ofMo deposits in East Qinling and their geodynamic settings[J].Mineral Resources and Geology,18(6):571-577(in Chinese withEnglish abstract).
Li S G,Jagoutz E,Chen YZand Li QL.2000.Sm-Nd and Rb-Sriso-topic chronology and cooling history of ultrahigh pressure metamor-phic rocks andtheir country rocks at Shuangheinthe Dabie Moun-tains,Central China[J].Geochi mica et Cosmochi mica Acta,64(6):1077-1093.
Lu S M,Xu X C and Peng Z.2005.Geologic feature and genesis ofmulti-metal deposit of crypto-explosion breccia type in the east partof north Huaiyang tectonic zone[J].Geology and Prospecting,41(3):7-11(in Chinese with English abstract).
Mao J W,Xie G Q,Bierlein F,et al.2008.Tectonic i mplications fromRe-Os dating of Mesozoic molybdenumdepositsin East Qinling-Di-abie orogenic belt[J].Geochi mica et Cosmochi mica Acta,72:4607-4626.
Okay AI,Xu S and Sengor A MC.1989.Coesite fromthe Dabieshaneclogites,central China[J].Eur.J.Mineral.,1:595-598.
Peng Z,Lu S Mand Xu X C.2005.Regional metallogenic regularitiesof the gold-polymetallic deposits in eastern part of north Huaiyangtectonic zone[J].Journal of Hefei University of Technology,28(4):364-368(in Chinese with English abstract).
Qu WJ and Du A D.2003.Highly precise Re-Os dating of molybdeniteby ICP-MS with Carius tube sample digestion[J].Rock andMineral Analysis,22(4):254-257(in Chinese with Englishabstract).
Wang S S,He J H,Li R Mand Zhao D Z.1979.Note onisotope dilu-tion method for K-Ar dating[J].Chinese Jour.Geol.(formerly,Scientia Geologica Sinica),(2):139-150(in Chinese).
Xu S T,Liu Y C,Jiang L L,Wu WPand Chen G B.2002.Architectureand kinematics of the Dabie mountains orogen[M].Hefei:Press ofUniversity of Science and Technology of China(in Chinese).
Yang Z Q.2007.Re-Os isotopic ages of Tangjiaping molybdenum de-posit in Shangcheng County,Henan andtheir geological significance[J].Mineral Deposits,26(3):289-295(in Chinese with Englishabstract).
Zhong Z Q,Suo S T,Zhang HF and Zhou H W.2001.Major con-stituents and texture of the Tongbai-Daibie collisional orogenic belt[J].Earth Science,26(6):560-567(in Chinese with Englishab-stract).
陈文,刘新宇,张思红.2002.连续激光阶段升温40Ar/39Ar地质年代测定方法研究[J].地质论评,48(增刊):127-134.
杜安道,何红蓼,殷宁万,邹晓秋,孙亚利,孙德忠,陈少珍,屈文俊.1994.辉钼矿的铼-锇同位素地质年龄测定方法研究[J].地质学报,68(4):339-347.
杜建国.2000.大别造山带中生代岩浆作用与成矿地球化学(博士论文)[D].合肥:合肥工业大学.1-176.
杜建国,张鹏,姜俊峰.1996.安徽北淮阳构造岩相带的划分与对比[J].安徽地质,6(1):19-27.
高山,张本仁,金振民,Kern H.1999.秦岭-大别造山带下地壳拆沉作用[J].中国科学,29(6):532-541.
高廷臣.1993.河南桐柏山-大别山地区韧性剪切带成金模式[J].河南地质,11(3):161-168.
李永峰,王春秋,白凤军,宋艳玲.2004.东秦岭钼矿Re-Os同位素年龄及其成矿动力学背景[J].矿产与地质,18(6):571-578
陆三明,徐晓春,彭智.2005.北淮阳构造带东段隐爆角砾岩型多金属矿床的地质特征及成因[J].地质与勘探,41(3):7-11.
彭智,陆三明,徐晓春.2005.北淮阳构造带东段金-多金属矿床区域成矿规律[J].合肥工业大学学报,28(4):364-368.
屈文俊,杜安道.2003.高温密闭溶样电感耦合等离子体质谱准确测定辉钼矿铼-锇地质年龄[J].岩矿测试,22(4):254-257.
王松山,何娟华,李若梅,赵东植.1979.测定地质年代的钾-氩稀释法[J].地质科学,(2):139-150.
徐树桐,刘贻灿,江来利,吴维平,陈冠宝.2002.大别造山带的构造几何学和运动学[M].合肥:中国科学技术大学出版社.
杨泽强.2007.河南商城县汤家坪钼矿辉钼矿铼-锇同位素地质年龄及地质意义[J].矿床地质,26(3):289-295.
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