材料期刊网

山东海阳土堆金矿床位于中生代胶莱盆地的东北部边缘,牟平—即墨金成矿带内,控矿构造为郭城断裂及其派生的一系列次级断裂,赋矿围岩为荆山群的灰白色大理岩和变粒岩,到目前为止共圈定出34个工业矿体.对矿区内主成矿阶段矿石石英中的流体包裹体进行了岩相学观测、显微测温以及单个包裹体激光拉曼光谱成分分析.研究结果表明,流体包裹体类型主要为气液二相包裹体、纯CO2包裹体和含CO2三相包裹体,同时发育少量单液相包裹体.成矿流体具有中—低盐度(5.59%~13.77%)、低密度(0.60~0.98 g/cm3)的特点,成矿温度为280~320℃,成矿压力为80~109 MPa;成矿深度为7.30~8.65 km.激光拉曼光谱分析显示,流体包裹体中以普遍富含CO2为特征,成矿流体为CO2-NaCl-H2 O体系.结合氢氧同位素分析结果,认为土堆金矿床为幔源流体参与成矿的中温热液脉型金矿床.

Tudui Gold Deposit is located in the northeast margin of Jiaolai Basin ,which is part of the Muping-Jimo gold metallogenic belt .The ore-controlling structure is Guocheng fault and a series of its derived secondary faults .The surrounding rocks are pale griotte and granulite of Jingshan Group with 34 industrial orehodies so far delineated .Petro-graphic observation , microthermometry and laser Raman microspectroscopic studies on individual fluid inclusions in quartz of main mineralization stages of Tudui Gold Deposit are carried out .The results show that there are four types of fluid inclusions:mainly gas-liquid two-phased inclusions ,pure CO2 inclusions,three-phased inclusions containing CO 2 as well as some small amounts of single phase inclusions .The ore-forming fluids show the features of medium-low sa-linity (5.59 %to 13.77 %) and low density (0.6 g/cm3 to 0.98 g/cm3 ); Mineralization temperature ranges be-tween 280 ℃and 320 ℃,and the ore-forming pressure from 80 MPa to 109 MPa,while mineralization depth ranges from 7.30 km to 8.65 km.Laser Raman microspectroscopic study shows that the ore-forming fluid inclusions are gen-erally rich in CO 2 ,and the ore-forming fluids belong to a CO 2 -NaCl-H2 O system .The paper combined with the re-sults of isotopic analysis takes that the deposit is a mesothermal type gold deposit with mantle -derived fluids involved while mineralization .