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矿床地质  2008 

滇西北保山核桃坪铅锌矿床成矿流体来源的同位素地球化学证据

Keywords: 地球化学,岩浆热液,成矿流体,幔源流体,核桃坪铅锌矿床,滇西北,滇西北,保山,桃坪,铅锌矿床成矿,流体来源,硫和铅同位素,地球化学证据,deposit,resources,fluid,evidence,Isotope,Baoshan,Yunnan,地质找矿,指导,驱动,深部过程,受控,成矿作用

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Abstract:

滇西北核桃坪铅锌矿是保山地块内沿澜沧江断裂带发育的一个大型铅锌多金属矿床,矿体严格受近SN向的断裂带及层间破碎带控制,赋存于上寒武统核桃坪组和沙河厂组大理岩化灰岩及矽卡岩中.文章在分析矿床地质特征的基础上,通过对V1矿体的氢、氧、碳、硫、硅和铅同位素地球化学的示踪研究,探讨了成矿溶液中水、碳、硅、硫和铅的来源以及成矿流体的演化问题.研究表明,V1矿体中矿石的石英δ18O水值变化范围为6.1‰~7.6‰,平均为6.7‰,其δDv-SMOW值变化范围为-100‰~-108‰,平均为-104‰,说明成矿流体主要来自深部岩浆分异水,并在后期成矿作用过程中有地层建造水和大气降水的加入;矿石中方解石的δ13Cv-PDB和δ18O水值分别为-6.6‰~-5.9%0和5.0‰~5.2‰,反映成矿流体的碳、氧具有深部流体与围岩发生交代反应的特征.硅、硫和铅同位素具深部岩浆或地幔来源的特点,但遭受后期壳源物质的混染.据此提出该矿床是与深部岩浆热液或幔源流体贯入有关的构造热液脉型矿床,其成矿作用受控于深部过程的驱动和控制,可为指导地质找矿提供依据.

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