云南老君山锡多金属成矿区硫、铅、氢、氧同位素地球化学

doi:10.13278/j.cnki.jjuese.201601110

摘要/Abstract

摘要：

滇东南老君山成矿区是我国西南部重要的锡、钨多金属成矿区之一,本文围绕成矿区中典型矿床进行了系统取样和硫、铅、氢、氧同位素测试工作,并针对分析结果结合矿区地质情况进行了解译。研究区硫同位素δ³⁴S分布范围为-1.50‰~8.61‰,均值为2.06‰,属壳幔混合来源硫;矿物生成顺序较早的单矿物硫同位素组成为幔源,晚期偏壳源;层状矽卡岩型矿石硫同位素组成偏幔源,花岗岩和花岗斑岩的硫同位素组成为壳源,穿层石英脉型矿石硫同位素组成可分为幔源和壳源两类。铅同位素分析结果属壳幔混合来源,以壳源铅为主,铅同位素测年分析结果显示有多期地质作用对成矿有所影响。氢、氧同位素组成指示成矿流体以岩浆水为主,并有大气降水的混入。结合老君山成矿区地质、同位素组成及测年结果分析,老君山成矿区众多矿床的形成应为早加里东期海底喷流沉积、印支期区域变质和燕山期花岗岩热液叠加改造等地质因素共同作用的结果。

关键词: 地球化学, 同位素特征, 成矿流体, 成矿物质, 老君山成矿区

Abstract:

Laojunshan tin poly-metallic metallogenic region is an important resource base of tin, tungsten and other metals in the Southwest of China. S, Pb, H,and O isotopes of the typical deposits are tested, and geological interpretation is discussed. The results show that the sulfur isotope δ³⁴S ranges from -1.50‰ to 8.61‰, with an average 2.06‰, a mantle-crustal mixed source. The early crystallized minerals are characterized by mantle-source sulfur; while the late crystallized ones are tend to be with crustal source sulfur. The sulfur in stratiform skarn related ores is mantle source; while in granite and porphyry related ores the sulfur is crustal source. Quartz vein type ores could be divided into two kinds according to the sulfur source of mantle or crust. Pb isotopic characteristics indicate a mixed source of mantle and crust with the major from the crust. The oxygen and hydrogen isotopic compositions indicate that the ore forming fluids were composed of magmatic fluids in the early stage and of meteoric water in the late stage. The formation of Laojunshan tin poly-metallic metallogenic region might have been resulted from the combination of the volcanic exhalation sedimentary of Early Caledonian, the regional metamorphism of Indo-chinese,and the granitic superimposition of Late Yanshanian.

Key words: geochemistry, isotopic characteristics, ore-forming fluid, ore-forming materials, Laojunshan tin poly-metallic metallogenic region

中图分类号:

P618.4

贾福聚, 燕永锋, 伍伟, 刘晓玮. 云南老君山锡多金属成矿区硫、铅、氢、氧同位素地球化学[J]. 吉林大学学报(地球科学版), 2016, 46(1): 105-118.

Jia Fuju, Yan Yongfeng, Wu Wei, Liu Xiaowei. S,Pb,H and O Isotopic Geochemistry of Laojunshan Tin Poly-Metallic Metallogenic Region, Southeastern Yunnan Province, China[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(1): 105-118.

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