安徽沙坪沟斑岩钼矿锆石U-Pb和辉钼矿Re-Os年龄
摘要
沙坪沟斑岩钼矿是大别成矿带近年发现的超大型矿床。在对矿化特征分析的基础上,对其进行了成岩成矿年代学研究。采用LA-ICP-MS锆石U-Pb测年技术,得到含矿岩体的成岩年龄。细粒石英正长岩与中粒石英正长岩分别形成于122.51±0.81Ma和121.5±1.3Ma,正长斑岩形成于120.7±1.1Ma。通过矿床辉钼矿Re-Os同位素分析,获得其模式年龄为100±1.8～113.6±1.7Ma。成岩与成矿时差约7Ma,指示含矿热液活动时限较长。长时间的热液活动可能是形成沙坪沟超大型斑岩钼矿床的重要因素。沙坪沟钼成矿时间与大别带钼矿化时间(133～110Ma)高度一致,与东秦岭晚期钼矿化时间相同。大别带钼矿是秦岭-大别成矿带的组成部分,形成于相同构造背景下,是区域构造岩浆作用的产物。
The Shapinggou deposit occurred in the Dabie metallogenic belt is a superlarge porphyry molybdenum deposit discovered in recent years.Based on the analysis for the mineralization feature of the deposit,zircon LA-ICP-MS U-Pb ages were determined for the ore-bearing rocks in Shapingguo deposit.Zircon U-Pb dating yields ages of(122.51±0.81)Ma,(121.5±1.3)Ma and(120.7±1.1)Ma for fine-grained quartz syenite,medium-grained quartz syenite and syenite porphyry,respectively.The187Re and187Os contents of molybdenite from the molybdenum deposit are determined by the Inductively Coupled Plasma Mass Spectrometry(ICP-MS).The Re-Os model ages of the molybdenite samples vary from(100±1.8)Ma to(113.6±1.7) Ma.The time difference between magmatism and mineralization of the Shapingguo deposit was about 7 Ma,which implicated there long active history of the ore fluid in the deposit.The long activities of the ore fluid in the deposit may be a key condition of being a superlarge molybdenum deposit.The ore-forming age of the Shapingguo deposit is identical to the age of porphyry molybdenum mineralization in the Dabie metallogenic belt,which in the later molybdenum mineralization period in the East Qinglin Mountains.The molybdenum deposits occurred in Dabie Mountains are a main part of the East Qinglin-Dabie metallogenic belt.The porphyry molybdenum deposits in the East Qinglin belt and in the Dabie belt are products of syntectonic-magmatic activity,which shared similar settings of metallogenic dynamics.
The Shapinggou deposit occurred in the Dabie metallogenic belt is a superlarge porphyry molybdenum deposit discovered in recent years.Based on the analysis for the mineralization feature of the deposit,zircon LA-ICP-MS U-Pb ages were determined for the ore-bearing rocks in Shapingguo deposit.Zircon U-Pb dating yields ages of(122.51±0.81)Ma,(121.5±1.3)Ma and(120.7±1.1)Ma for fine-grained quartz syenite,medium-grained quartz syenite and syenite porphyry,respectively.The187Re and187Os contents of molybdenite from the molybdenum deposit are determined by the Inductively Coupled Plasma Mass Spectrometry(ICP-MS).The Re-Os model ages of the molybdenite samples vary from(100±1.8)Ma to(113.6±1.7) Ma.The time difference between magmatism and mineralization of the Shapingguo deposit was about 7 Ma,which implicated there long active history of the ore fluid in the deposit.The long activities of the ore fluid in the deposit may be a key condition of being a superlarge molybdenum deposit.The ore-forming age of the Shapingguo deposit is identical to the age of porphyry molybdenum mineralization in the Dabie metallogenic belt,which in the later molybdenum mineralization period in the East Qinglin Mountains.The molybdenum deposits occurred in Dabie Mountains are a main part of the East Qinglin-Dabie metallogenic belt.The porphyry molybdenum deposits in the East Qinglin belt and in the Dabie belt are products of syntectonic-magmatic activity,which shared similar settings of metallogenic dynamics.
引文
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杜保峰,魏俊浩,王启,李艳军,刘国春,于海涛,刘永利.2010.中国东部钼矿成矿背景与成岩=成矿时差讨论.矿床地质,29(6):935～955.
郭保健,毛景文,李厚民,屈文俊,仇建军,叶会寿,李蒙文,竹学丽.2006.秦岭造山带秋树湾铜钼矿床辉钼矿Re-Os定年及其地质意义.岩石学报,22(9):2141～2148.
侯增谦,曲晓明,王淑贤,高永丰,杜安道,黄卫.2003.西藏高原冈底斯斑岩铜矿带辉钼矿Re-Os年龄:成矿作用时限与动力学背景应用.中国科学(D辑),33(7):609～618.
黄典豪,吴澄宇,杜安道,何红蓼.1994.东秦岭地区钼矿床的铼锇同位素年龄及其意义.矿床地质,13(3):220～210.
李法岭.2008.河南南部天目山岩体特征及其钼矿化.矿产与地质,22(2):111～115.
李吉林.2010.河南省光山县千鹅冲矿区钼矿床成因研究.现代矿业,7(7):79～83.
李永峰,毛景文,刘敦一,王彦斌,王志良,王义天,李晓峰,张作衡,郭保健.2006.豫西雷门沟斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os测年及其地质意义.地质论评,52(1):122～131.
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.地质与勘探,41(3):7～11.
罗铭玖,张辅民,董群英,许永仁,黎世美,李昆华.1991.中国钼矿床.郑州:河南科学技术出版社,1～452.
罗齐云,李吉林.2009.河南光山县千鹅冲铜钼多金属质特征及成因浅析.地质与矿产,23(6):495～499.
罗正传,李永峰,王义天,王小高.2010.大别山北麓河南新县地区大银尖钼矿辉钼矿Re-Os同位素年龄及其地质意义.地质通报,9(9):1349～1354.
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.合肥工业大学学报(自然科学版),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.岩矿测试,22(4):254～257.
苏捷,张宝林,孙大亥,崔敏利,屈文俊,杜安道.2009.东秦岭东段新发现的沙坡岭细脉浸染型钼矿地质特征、Re-Os同位素年龄及其地质意义.地质学报,83(10):1490～1496.
王玉贤.2006.安徽省金寨县银沙益井爆发角砾岩筒成矿特征.安徽地质,16(3):180～186.
徐晓春,楼金伟,陆三明,谢巧勤,褚平利,尹滔.2009.安徽金寨银山钼-铅-锌多金属矿床Re-Os和有关岩浆岩40Ar-39Ar年龄测定.矿床地质,28(5):621～632.
杨梅珍,曾键年,覃永军,李法岭,万守权.2010.大别山北缘千鹅冲斑岩型钼矿床锆石U-Pb和辉钼矿Re-Os年代学及其地质意义.地质科技情报,29(5):35～45.
杨泽强.2007.河南商场县汤家坪钼矿辉钼矿铼-锇同位素年龄及地质意义.矿床地质,26(3):289～295.
叶会寿,毛景文,李永峰,郭保健,张长青,刘珺,闫全人,刘国印.2006.东秦岭东沟超大型斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os年龄及其地质意义.地质学报,80(7):1078～1088.
袁洪林,高山,罗彦,宗春蕾,戴梦宁,柳小明,第五春荣.2007.LuHf年代学研究——以大别榴辉岩为例.岩石学报,23(2):233～239.
张怀东,史东方,郝越进,王波华.2010.安徽省金寨县沙坪沟斑岩型钼矿成矿地质特征,安徽地质,20(2):104～108.
周珂,叶会寿,毛景文,屈文俊,周树峰,孟芳,高亚龙.2009.豫西鱼池岭斑岩型钼矿床地质特征及其辉钼矿铼-锇同位素年龄.矿床地质,28(2):170～184.
Liu Y S,Hu Z C,Gao S,G nther D,Xu J,Gao C G,Chen H H.2008.In situ analysis of major and trace elements of an hydrousminerals by LA-ICP-MS without applying an internal standard.Chemical Geology257,34～43.
Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q,Wang D B.2010.Continental and oceanic crust recycling-induced melt-peridotiteinteractions in the Trans-North China Orogen:U-Pb dating,Hfisotopes and trace elements in zircons of mantle xenoliths. Journal of Petrology,51(1&2),537～571.
Ludwig K R.2003.User’s Manual for IsoplotPEx,version3.0:A Geochronological Toolkit for Microsoft Excel.BerkeleyGeochronology Center,Special Publication,4:1～67.
Mao J W,Xie G Q,Bierlein F,Qv W J,Du A D,Ye H S,PirajnoF,Li H M,Guo B J,Li Y F,Yang Z Q.2008.Tectonicimplications from Re-Os dating of Mesozoic molybdenumdeposits in the East Qinling-Dabie orogenic belt.Geochim.Cosmochim.Acta,72(18):4607～4626.
Richards J P,Boyce A J Pringle M S.2001.Geologic evolution ofthe Escondida area,northern Chile:a modle for spatial andtemporal location of porphyry Cu mineralization.EconomicGeology,96:271～306.
Smoliar M I,Walker R J,Morgan J W.1996.Re-Os ages of groupIIA,IIIA,IVA and VIB iron meteorites.Science,271:1099～1102.
Stein H J,Markey R J,Morgan J W,Du A D.Sun Y.1997.Highly precise and accurate Re-Os ages for molybdenite fromthe East Qinling molybdenum belt,Shaanxi Province,China.Economic Geology,92:827～835.
杜安道,屈文俊,王登红,李厚民,丰成友,刘华,任静,曾法刚.2007.辉钼矿亚晶粒范围内Re和187Os的失耦现象.矿床地质,26(5):572～580.
杜保峰,魏俊浩,王启,李艳军,刘国春,于海涛,刘永利.2010.中国东部钼矿成矿背景与成岩=成矿时差讨论.矿床地质,29(6):935～955.
郭保健,毛景文,李厚民,屈文俊,仇建军,叶会寿,李蒙文,竹学丽.2006.秦岭造山带秋树湾铜钼矿床辉钼矿Re-Os定年及其地质意义.岩石学报,22(9):2141～2148.
侯增谦,曲晓明,王淑贤,高永丰,杜安道,黄卫.2003.西藏高原冈底斯斑岩铜矿带辉钼矿Re-Os年龄:成矿作用时限与动力学背景应用.中国科学(D辑),33(7):609～618.
黄典豪,吴澄宇,杜安道,何红蓼.1994.东秦岭地区钼矿床的铼锇同位素年龄及其意义.矿床地质,13(3):220～210.
李法岭.2008.河南南部天目山岩体特征及其钼矿化.矿产与地质,22(2):111～115.
李吉林.2010.河南省光山县千鹅冲矿区钼矿床成因研究.现代矿业,7(7):79～83.
李永峰,毛景文,刘敦一,王彦斌,王志良,王义天,李晓峰,张作衡,郭保健.2006.豫西雷门沟斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os测年及其地质意义.地质论评,52(1):122～131.
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.地质与勘探,41(3):7～11.
罗铭玖,张辅民,董群英,许永仁,黎世美,李昆华.1991.中国钼矿床.郑州:河南科学技术出版社,1～452.
罗齐云,李吉林.2009.河南光山县千鹅冲铜钼多金属质特征及成因浅析.地质与矿产,23(6):495～499.
罗正传,李永峰,王义天,王小高.2010.大别山北麓河南新县地区大银尖钼矿辉钼矿Re-Os同位素年龄及其地质意义.地质通报,9(9):1349～1354.
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.合肥工业大学学报(自然科学版),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.岩矿测试,22(4):254～257.
苏捷,张宝林,孙大亥,崔敏利,屈文俊,杜安道.2009.东秦岭东段新发现的沙坡岭细脉浸染型钼矿地质特征、Re-Os同位素年龄及其地质意义.地质学报,83(10):1490～1496.
王玉贤.2006.安徽省金寨县银沙益井爆发角砾岩筒成矿特征.安徽地质,16(3):180～186.
徐晓春,楼金伟,陆三明,谢巧勤,褚平利,尹滔.2009.安徽金寨银山钼-铅-锌多金属矿床Re-Os和有关岩浆岩40Ar-39Ar年龄测定.矿床地质,28(5):621～632.
杨梅珍,曾键年,覃永军,李法岭,万守权.2010.大别山北缘千鹅冲斑岩型钼矿床锆石U-Pb和辉钼矿Re-Os年代学及其地质意义.地质科技情报,29(5):35～45.
杨泽强.2007.河南商场县汤家坪钼矿辉钼矿铼-锇同位素年龄及地质意义.矿床地质,26(3):289～295.
叶会寿,毛景文,李永峰,郭保健,张长青,刘珺,闫全人,刘国印.2006.东秦岭东沟超大型斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os年龄及其地质意义.地质学报,80(7):1078～1088.
袁洪林,高山,罗彦,宗春蕾,戴梦宁,柳小明,第五春荣.2007.LuHf年代学研究——以大别榴辉岩为例.岩石学报,23(2):233～239.
张怀东,史东方,郝越进,王波华.2010.安徽省金寨县沙坪沟斑岩型钼矿成矿地质特征,安徽地质,20(2):104～108.
周珂,叶会寿,毛景文,屈文俊,周树峰,孟芳,高亚龙.2009.豫西鱼池岭斑岩型钼矿床地质特征及其辉钼矿铼-锇同位素年龄.矿床地质,28(2):170～184.
Liu Y S,Hu Z C,Gao S,G nther D,Xu J,Gao C G,Chen H H.2008.In situ analysis of major and trace elements of an hydrousminerals by LA-ICP-MS without applying an internal standard.Chemical Geology257,34～43.
Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q,Wang D B.2010.Continental and oceanic crust recycling-induced melt-peridotiteinteractions in the Trans-North China Orogen:U-Pb dating,Hfisotopes and trace elements in zircons of mantle xenoliths. Journal of Petrology,51(1&2),537～571.
Ludwig K R.2003.User’s Manual for IsoplotPEx,version3.0:A Geochronological Toolkit for Microsoft Excel.BerkeleyGeochronology Center,Special Publication,4:1～67.
Mao J W,Xie G Q,Bierlein F,Qv W J,Du A D,Ye H S,PirajnoF,Li H M,Guo B J,Li Y F,Yang Z Q.2008.Tectonicimplications from Re-Os dating of Mesozoic molybdenumdeposits in the East Qinling-Dabie orogenic belt.Geochim.Cosmochim.Acta,72(18):4607～4626.
Richards J P,Boyce A J Pringle M S.2001.Geologic evolution ofthe Escondida area,northern Chile:a modle for spatial andtemporal location of porphyry Cu mineralization.EconomicGeology,96:271～306.
Smoliar M I,Walker R J,Morgan J W.1996.Re-Os ages of groupIIA,IIIA,IVA and VIB iron meteorites.Science,271:1099～1102.
Stein H J,Markey R J,Morgan J W,Du A D.Sun Y.1997.Highly precise and accurate Re-Os ages for molybdenite fromthe East Qinling molybdenum belt,Shaanxi Province,China.Economic Geology,92:827～835.
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