藏南柯月铅锌多金属矿床矿物标型特征及成矿物质来源

发布时间：2018-05-03 18:58

  本文选题：S-Pb同位素 + 矿物标型　； 参考：《地质科技情报》2017年03期

【摘要】：为了解藏南柯月铅锌多金属矿床主要矿物的标型特征及成矿物质来源,在详细野外及室内工作基础上对柯月铅锌多金属矿床进行了矿物电子探针和S-Pb同位素测定。柯月铅锌多金属矿床硫化物种类较多,电子探针分析结果显示,硫化物伴随的Cu、Ag含量较高。闪锌矿具有层控矿床特征,方铅矿及黄铁矿的标型特征表明其与沉积改造作用相关,同时也受到了岩浆及火山作用的影响。S同位素δ~(34)SCDT为4.9‰~11.2‰,与日当组地层S源范围相近,Pb同位素显示~(206)Pb/~(204)Pb比值为18.53~19.78,平均为19.589;~(207)Pb/~(204)Pb比值为15.674~15.939,平均为15.848;~(208)Pb/~(204)Pb比值为38.618~40.559,平均为40.155,与附近扎西康矿床的Pb同位素呈线性排列且放射性成因Pb较高,模式年龄均为负值,落入了北喜马拉雅和高喜马拉雅变质结晶岩系的印度地盾端元内,指示来源于上地壳。综上认为柯月铅锌多金属矿床具有沉积改造型矿床的特征;日当组地层及围岩对成矿提供矿源初始物质并且与扎西康特大型矿床成矿物质来源相似。
[Abstract]:In order to understand the typomorphic characteristics of the main minerals and the source of the ore-forming materials in the Keyue lead-zinc polymetallic deposit in southern Tibet, the mineral electron probe and S-Pb isotopic measurements were carried out on the basis of detailed field and laboratory work. There are many kinds of sulphides in the Coyue lead-zinc polymetallic deposit. The results of electron microprobe analysis show that the Cu + Ag content associated with the sulphide is higher. Sphalerite is characterized by stratabound deposits. The typomorphic characteristics of galena and pyrite indicate that they are related to sedimentary transformation, and are also influenced by magma and volcanism. The SCDT of S isotopic 未 ~ (34) N ~ (34) is 4.9 鈥，

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