湘南芙蓉矿田白腊水锡矿床包裹体特征

THE CHARACTERISTIC OF INCLUSIONS IN BAILASHUI TIN DEPOSIT OF FURONG OREFIELD,SOUTH OF HUNAN PROVINCE

白腊水锡矿床位于骑田岭复式岩体的南部,矿体受断裂构造带控制;矿脉(体)的分布及其形态、产状等受低序次断裂控制。矿物中V-L包裹体、V-L-Lco2包裹体发育,包裹体均一温度显示有三个区间,可划分为三个成矿阶段,反映出成矿多期次叠加的特征。根据石英流体包裹体Rb-Sr等时线年龄值(177Ma)和锡矿化强蚀变岩石Rb Sr同位素年龄(136Ma),表明成矿时代应为燕山早期,并且该矿床形成可能是二次成矿作用的产物。

Bailashui tin deposit locate to the south department of Qitianling compound rockbody. And the tin orebodies suffer to fracture structure to take the control; and the distributing of tin ore vein, outlook and attitute etc. of its appearance, suffer the low preface time to fracture structure control. The V- L inclusions and V- L- Lc02 inclusions in the mineral is very growth. The uniform temperature of inclusions shows to have three zones, and can divide to three mineralization stage, and reflect the characteristic for the overprint of mineralization adding of many periods. Metallogenetic epoch, according to the Rb- Sr isotope the age of the quartz fluid inclusions(177 Ma) and the rock Rb- Sr isotope the age with strong alteration of tin metallization (136 Ma), express mineralization ages should for the Yanshan earlier period, and the deposit the formation may be two times the result of the metallogenetic function.