作　　者： ; ; (林小明）;

机构地区： 广东省地质调查院广州510080

出　　处： 《桂林工学院学报》 2008年第3期301-306,共6页

摘　　要： 从成岩成矿年代、矿体形态、矿石特征、氧同位素、包裹体均一温度等方面对粤北梅子窝钨矿进行较系统的分析研究，钨矿主要产于花岗闪长岩基性边突起部位与寒武一奥陶系的接触带上，花岗闪长岩K-Ar年龄为141Ma。44号含矿石英脉与其围岩的δ^18O值总体上自矿脉下部向接触带呈减小的趋势，矿脉的δ^18O值较同一深度的围岩δ^18O值大，且全岩δ^18O值的这种变化与围岩δ^18O值的变化特征相一致。石英包裹体的均一温度平均值都比较接近，总体上有从矿脉上部向下部升高的趋势（190．6～409．5℃）；从矿脉下部往上，包裹体的盐度平均值总体上呈下降趋势。梅子窝钨矿床的成矿流体应是来自深部隐伏燕山期花岗岩的高温热液流体。隐伏于花岗闪长岩下部的白垩纪二云母花岗岩是燕山期地壳活动期间地温升高导致花岗闪长岩岩体及其他地层熔融的产物。在该矿V4号脉中，560m以下脉体极少钨矿石，此标高时，δ^18O值大于＋12．5％，石英流体包裹体均一温度平均值大于409．5℃，盐度平均值（w（NaCl））大于5．3％。 Based on the evidence from the Meiziwo tungsten deposit including the time-space relationship between the ore veins and their country rock strata, the temperature of fluid inclusions in the ore veins, minerali- zation characteristics, composition of oxygen isotopes etc, a model with relation to the in-situ melting hypothe- sis of granite for the formation of Meiziwo Tungsten deposit is prese considered to be formed in the Indochina stage. The K-Ar dating hanian stage （ 141 Ma）. The δ^18O values of an ore-bearing quartz the vein, suggesting that the heavy isotope is high temperature stage. Uniform temperature nted in this paper. The granodiorite body is indicates the formation in the middle Yans- vein are found decreasing from root to top of probably more stable in lattice of mineral than the light one in of fluid inclusions in the same vein is found decreasing from the lower part to the upper of a tungsten vein （ 190. 6 - 409. 5 ℃ ）. Research result on fluid inclusions indicates that with decreasing temperature from the roof upward, the salinity of fluid inclusions gradually reduces. There is little tungsten ore in vein 44 below 560 m. In this elevation, the δ^18O values are found larger than ＋ 12. 5%, uniform temperature average value of fluid inclusions in the same elevation is found higher than 409.5 ℃, and the salinity average value（w（NaCl） ）of fluid inclusions is larger than 5.3%.

关 键 词： 钨矿 流体包裹体 氧同位素 原地重熔成矿模型 梅子窝 广东

领　　域： [天文地球] [天文地球]