湖南永州老寨岭铜锡矿床锡石LA-MC-ICP-MS U-Pb定年研究
P597%O657.63; 锡石是锡多金属矿床中重要的矿石矿物,采用锡石对锡多金属矿床进行定年,已成为获得矿床成矿年龄最直接的方法.但由于锡石具有U含量较低、普通铅高的特点,目前锡石微区原位U-Pb定年方法的技术难点在于理想标样的研制和普通铅的准确扣除.本文通过优化该技术,对湖南省永州市老寨岭铜锡矿床的成矿时代进行约束.老寨岭铜锡矿床是以脉型为主的锡多金属矿床,矿体产出于印支晚期阳明山复式岩体的接触带上,主要由含锡石英脉、碎裂化云英岩化花岗岩及云英岩组成.利用LA-MC-ICP-MS微区原位U-Pb同位素测年技术,对老寨岭铜锡矿床中锡石进行研究,获得16LZ01、16LZ02、16LZ03等三...
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Published in | 岩矿测试 Vol. 43; no. 6; pp. 880 - 891 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | Chinese |
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中国地质调查局天津地质调查中心,天津 300170%中国地质调查局天津地质调查中心,天津 300170%中国地质调查局天津地质调查中心,天津 300170
01.11.2024
中国地质调查局自然资源综合调查指挥中心,北京 100055 中国石油大学(华东),山东青岛 266580%中国地质调查局自然资源综合调查指挥中心,北京 100055 |
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Abstract | P597%O657.63; 锡石是锡多金属矿床中重要的矿石矿物,采用锡石对锡多金属矿床进行定年,已成为获得矿床成矿年龄最直接的方法.但由于锡石具有U含量较低、普通铅高的特点,目前锡石微区原位U-Pb定年方法的技术难点在于理想标样的研制和普通铅的准确扣除.本文通过优化该技术,对湖南省永州市老寨岭铜锡矿床的成矿时代进行约束.老寨岭铜锡矿床是以脉型为主的锡多金属矿床,矿体产出于印支晚期阳明山复式岩体的接触带上,主要由含锡石英脉、碎裂化云英岩化花岗岩及云英岩组成.利用LA-MC-ICP-MS微区原位U-Pb同位素测年技术,对老寨岭铜锡矿床中锡石进行研究,获得16LZ01、16LZ02、16LZ03等三件样品的Tera-WasserburgU-Pb 下交点年龄分别为 222.0±1.5Ma(MSWD=1.6,n=37)、220.5±3.5Ma(MSWD=2.9,n=28)、225.0±1.6Ma(MSWD=1.3,n=31).结合矿床地质特征和前人成岩-成矿年代学成果,研究表明老寨岭铜锡矿床成矿作用主要发生在印支晚期,与阳明山复式花岗岩体的岩浆热液活动关系密切.本文研究结果为老寨岭铜锡矿的岩浆热液成因提供了重要的年代学证据. |
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AbstractList | P597%O657.63; 锡石是锡多金属矿床中重要的矿石矿物,采用锡石对锡多金属矿床进行定年,已成为获得矿床成矿年龄最直接的方法.但由于锡石具有U含量较低、普通铅高的特点,目前锡石微区原位U-Pb定年方法的技术难点在于理想标样的研制和普通铅的准确扣除.本文通过优化该技术,对湖南省永州市老寨岭铜锡矿床的成矿时代进行约束.老寨岭铜锡矿床是以脉型为主的锡多金属矿床,矿体产出于印支晚期阳明山复式岩体的接触带上,主要由含锡石英脉、碎裂化云英岩化花岗岩及云英岩组成.利用LA-MC-ICP-MS微区原位U-Pb同位素测年技术,对老寨岭铜锡矿床中锡石进行研究,获得16LZ01、16LZ02、16LZ03等三件样品的Tera-WasserburgU-Pb 下交点年龄分别为 222.0±1.5Ma(MSWD=1.6,n=37)、220.5±3.5Ma(MSWD=2.9,n=28)、225.0±1.6Ma(MSWD=1.3,n=31).结合矿床地质特征和前人成岩-成矿年代学成果,研究表明老寨岭铜锡矿床成矿作用主要发生在印支晚期,与阳明山复式花岗岩体的岩浆热液活动关系密切.本文研究结果为老寨岭铜锡矿的岩浆热液成因提供了重要的年代学证据. |
Abstract_FL | Cassiterite is an important ore mineral in tin polymetallic deposits.Using cassiterite for dating tin polymetallic deposits has become one of the most direct methods to obtain the mineralization age of the deposits.However,due to the low uranium content and high common lead characteristics of cassiterite,the main problems and technical difficulties of the in situ U-Pb dating method for cassiterite lie in the development of ideal standards and the accuracy of common lead correction.The mineralization age of the Laozhailing Cu-Sn deposit in Yongzhou City,Hunan Province is constrained here by optimizing the technology.The Laozhailing Cu-Sn deposit is a vein-type tin polymetallic deposit,which is mainly composed of tin-quartz veins,cataclastic greisenized granite,and greisen.Three samples,16LZ01,16LZ02,and 16LZ03,were obtained with Tera-Wasserburg U-Pb lower intersection ages of 222.0±1.5Ma(MSWD=1.6,n=37),220.5±3.5Ma(MSWD=2.9,n=28),and 225.0±1.6Ma(MSWD=1.3,n=31),respectively.These results indicate mineralization in the late Indosinian period.The mineralization of the Laozhailing Cu-Sn deposit is closely related to the magmatic hydrothermal activity of the Yangmingshan complex granites.The results of this study provide important chronological evidence for the magmatic hydrothermal origin of the Laozhailing Cu-Sn deposit. |
Author | 涂家润 崔玉荣 肖志斌 崔敏利 周红英 喻光明 刘玖芬 杨君 |
AuthorAffiliation | 中国地质调查局自然资源综合调查指挥中心,北京 100055;中国地质调查局天津地质调查中心,天津 300170%中国地质调查局天津地质调查中心,天津 300170%中国地质调查局天津地质调查中心,天津 300170;中国石油大学(华东),山东青岛 266580%中国地质调查局自然资源综合调查指挥中心,北京 100055 |
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Author_FL | LIU Jiufen TU Jiarun YU Guangming YANG Jun CUI Minli ZHOU Hongying CUI Yurong XIAO Zhibin |
Author_FL_xml | – sequence: 1 fullname: CUI Yurong – sequence: 2 fullname: YANG Jun – sequence: 3 fullname: TU Jiarun – sequence: 4 fullname: XIAO Zhibin – sequence: 5 fullname: ZHOU Hongying – sequence: 6 fullname: YU Guangming – sequence: 7 fullname: CUI Minli – sequence: 8 fullname: LIU Jiufen |
Author_xml | – sequence: 1 fullname: 崔玉荣 – sequence: 2 fullname: 杨君 – sequence: 3 fullname: 涂家润 – sequence: 4 fullname: 肖志斌 – sequence: 5 fullname: 周红英 – sequence: 6 fullname: 喻光明 – sequence: 7 fullname: 崔敏利 – sequence: 8 fullname: 刘玖芬 |
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DocumentTitle_FL | Cassiterite U-Pb Dating with LA-MC-ICP-MS of the Laozhailing Cu-Sn Deposit,Yongzhou City,Hunan Province |
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Keywords | cassiterite U-Pb dating Hunan LA-MC-ICP-MS Cu-Sn deposit 锡石U-Pb定年 铜锡矿床 老寨岭 Laozhailing 湖南 |
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Title | 湖南永州老寨岭铜锡矿床锡石LA-MC-ICP-MS U-Pb定年研究 |
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