腾冲小龙河锡矿床稳定同位素及流体包裹体特征研究  

STUDY ON THE CHARACTERISTICS OF STABLE ISOTOPES AND FLUID INCLUSIONS IN XIAOLONGHE TIN DEPOSIT IN TENGCHONG

作　　者：沈辉[1] 赵梓涵[1] SHEN Hui;ZHAO Zi-han(Yunnan Exploration of Geology and Mineral Resources,Kunming 650051)

机构地区：[1]云南省地质矿产勘查院,云南昆明650051

出　　处：《云南地质》2024年第1期31-36,共6页Yunnan Geology

摘　　要：腾冲小龙河锡矿床稳定同位素、流体包裹体特征结果表明:δ^(34)S_(v-CDT)值+5.0‰~+8.1‰,平均+6.33‰,与花岗岩副矿物黄铁矿硫同位素δ^(34)S_(v-CDT)值范围(0‰~+5.7‰)一致,显示花岗岩浆水为主要成矿流体,具高温、高盐度、高密度特征;包裹体由两类包裹体组成,Ⅰ类NaCl-H_(2)O体系气液两相包裹体,气泡体积占包裹体体积5%~15%,各阶段石英中呈定向排列,锡石包裹体仅在云英岩型浸染状锡石阶段发育;Ⅱ类大气液比包裹体,气泡体积占55%~65%,次棱角状孤立分布,云英岩阶段石英内发育。云英岩阶段→石英脉阶段→晚期弱云英岩化阶段成矿期成矿流体从高温、高盐度向中高温、中高盐度持续演化。为典型的气化-高温热液云英岩型锡矿床。The results of stable isotope and fluid inclusion characteristics of Xiaolonghe tin deposit in Tengchong show that theδ^(34)S_(v-CDT)value is+5.0‰~+8.1‰,with an average of+6.33‰,which is consistent with the range ofδ^(34)S_(v-CDT)value(0‰~+5.7‰)of pyrite sulfur isotope of granite accessory minerals,indicating that granite magma water is the main ore-forming fluid,with high temperature,high salinity and high density characteristics.The inclusions are composed of two types of inclusions.Type I is the gas-liquid two-phase inclusions of NaCl-H_(2)O system.The volume of bubbles accounts for 5%-15%of the volume of inclusions.The inclusions are arranged in the quartz of each stage,and the cassiterite inclusions are only developed in the disseminated cassiterite stage of greisen type.Type II is atmospheric liquid ratio inclusions,bubble volume accounts for 55%~65%,sub-angular isolated distribution,developed in quartz of greisen stage.From the greisen stage to the quartz vein stage to the late weak greisenization stage,the ore-forming fluid continues to evolve from high temperature and high salinity to medium-high temperature and medium-high salinity.It is a typical gasification-high temperature hydrothermal greisen type tin deposit.

关 键 词：锡矿体 稳定同位素 流体包裹体 小龙河锡矿床 云南腾冲 

分 类 号：P618.44[天文地球—矿床学]