Pb同位素组成打靶法示踪隐伏热液型铀矿有效性研究
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摘要
建立了热液型铀矿Pb同位素组成打靶方法。该方法主要包括研究勘查区不同类型岩石的~(204)Pb、~(206)Pb、~(207)Pb、~(208)Pb同位素组成、建立成矿~(208)Pb/~(204)Pb-~(206)Pb/~(204)Pb、~(208)Pb/~(204)Pb-~(207)Pb/~(204)Pb、~(208)Pb/~(206)Pb-~(207)Pb/~(206)Pb靶标范围及Ⅰ—Ⅳ共4个评级等级、实施测量剖面样品取样及Pb同位素组成分析、按Ⅰ—Ⅳ等级评价测量剖面测量点4个实施步骤。在桃山铀矿田大布矿床进行了方法有效性试验,结果表明该方法在区域上能够反映出矿化点或矿床的位置,是一种有效的土壤覆盖区范围区域热液型隐伏铀矿勘查方法。在该矿田王泥田地区进行了剖面勘查,预测王泥田东南部鱼成排及其附近为重点找矿有利区段。
A target tracing method for~(204)Pb,~(206)Pb,~(207)Pb,~(208)Pb isotope composition of hydrothermal uranium deposits has been established.This method includes four main steps:studying the lead isotope composition of different types of rocks in the exploration area,establishing the range of~(208)Pb/~(204)Pb-~(206)Pb/~(204)Pb,~(208)Pb/~(204)Pb-~(207)Pb/~(204)Pb,~(208)Pb/~(206)Pb-~(207)Pb/~(206)Pb isotope composition of metallogenic targets inⅠ-Ⅳgrades,sampling and analysis of isotope composition in the survey section and evaluating the samples accordingⅠ-Ⅳgrades range.The results of validity test in Dabu deposit of Taoshan uranium ore field showed that the method can reflect the location of mineralization point or deposit regionally,and it is an effective regional hydrothermal prospecting method for concealed uranium deposits in soilcovered areas.Profile exploration has been carried out in Wangnitian area of this ore field,and the Yuchengpai area and its vicinity in southeastern Wangnitian area are predicted to be favorable areas for uranium prospecting.
A target tracing method for~(204)Pb,~(206)Pb,~(207)Pb,~(208)Pb isotope composition of hydrothermal uranium deposits has been established.This method includes four main steps:studying the lead isotope composition of different types of rocks in the exploration area,establishing the range of~(208)Pb/~(204)Pb-~(206)Pb/~(204)Pb,~(208)Pb/~(204)Pb-~(207)Pb/~(204)Pb,~(208)Pb/~(206)Pb-~(207)Pb/~(206)Pb isotope composition of metallogenic targets inⅠ-Ⅳgrades,sampling and analysis of isotope composition in the survey section and evaluating the samples accordingⅠ-Ⅳgrades range.The results of validity test in Dabu deposit of Taoshan uranium ore field showed that the method can reflect the location of mineralization point or deposit regionally,and it is an effective regional hydrothermal prospecting method for concealed uranium deposits in soilcovered areas.Profile exploration has been carried out in Wangnitian area of this ore field,and the Yuchengpai area and its vicinity in southeastern Wangnitian area are predicted to be favorable areas for uranium prospecting.
引文
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[3]常向阳,朱炳泉,邹日.铅同位素系统剖面化探与隐伏矿深度预测:以云南金平龙脖河铜矿为例[J].中国科学(D辑), 2000,(1):33-39.
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[5]刘汉彬,韩娟,金贵善,等. Pb同位素特征值示踪法在棉花坑矿床及其外围应用[J].世界核地质科学, 2017, 34(4):244-248.
[6]朱炳泉.矿石Pb同位素三维空间拓扑图解用于地球化学省与矿中区划[J].地球科学, 1993,(3):209-216.
[7]Sanford R F. Lead isotopic compositions and paleohy￣drology of caldera￣related epithermal veins, Lake City, Colorado[J]. Geological Society of America Bulletin, 1992, 104:1236-1245.
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[10]张金带.华东铀矿地质志[R].北京:中国核工业地质局, 2005:642-675.
[11]刘汉彬,金贵善,李军杰,等.桃山复式花岗岩体单颗粒锆石U-Pb年龄及地质意义[J].世界核地质科学, 2014, 31(4):107-114.
[2]黄斌.铅同位素方法在铜陵地区确定金矿靶区的研究[J].矿产与地质, 1990,(2):66-76.
[3]常向阳,朱炳泉,邹日.铅同位素系统剖面化探与隐伏矿深度预测:以云南金平龙脖河铜矿为例[J].中国科学(D辑), 2000,(1):33-39.
[4]芮宗瑶,李宁,王龙生.关门山铅锌矿床:盆地热卤水成矿及铅同位素打靶[M].北京:地质出版社, 1991:129-162.
[5]刘汉彬,韩娟,金贵善,等. Pb同位素特征值示踪法在棉花坑矿床及其外围应用[J].世界核地质科学, 2017, 34(4):244-248.
[6]朱炳泉.矿石Pb同位素三维空间拓扑图解用于地球化学省与矿中区划[J].地球科学, 1993,(3):209-216.
[7]Sanford R F. Lead isotopic compositions and paleohy￣drology of caldera￣related epithermal veins, Lake City, Colorado[J]. Geological Society of America Bulletin, 1992, 104:1236-1245.
[8]Foley N K, Ayuso R A. Lead isotope compositions as guides to early gold mineralization:The north Amethyst vein system, Creede District, Colorado[J]. Economic Geology, 1994, 89:1842-1859.
[9]Carr G R, Dean J A, Suppel D W, et al. Precise lead isotope fingerprinting of hydrothermal activity associated with Ordovician to Carboniferous metallogenetic events in the Lachlan fold belt of New South Wales[J]. Economic Geology, 1995,90:1476.
[10]张金带.华东铀矿地质志[R].北京:中国核工业地质局, 2005:642-675.
[11]刘汉彬,金贵善,李军杰,等.桃山复式花岗岩体单颗粒锆石U-Pb年龄及地质意义[J].世界核地质科学, 2014, 31(4):107-114.