韧性剪切带型金矿床矿物中熔融包裹体与矿床成因研究

Melt Inclusions in Minerals and Ore Genesis of Ductile Shear Zone Gold Deposits

在新疆乔尕山及广东河台韧性剪切带金矿床的含金石英脉及糜棱岩中首次发现熔融包裹体及流体 熔融包裹体,其均一化温度分别为780～960℃与600℃。用电子探针及扫描电镜能谱对熔融包裹体子矿物成分进行分析,通过56个熔融包裹体231个测点分析,鉴定出石英、白云母、黑云母、磁铁矿等十种子矿物,组成不同的矿物组合。子矿物常含Si、Al、Na、K、Au、Ag、Cu等元素。剪切带金矿床中熔融包裹体的发现为其成因研究提供了新依据,表明成矿与多阶段硅酸盐熔体及流体作用有关。

Melt and fluid-melt inclusions were discovered for the first time in gold bearing quartz veins and mylonites in the Qiaogashan gold deposit in Xingjiang and the Hetai gold deposit in Guangdong.The homogenization temperatures are 780-960℃ and 600℃,respectively. Composition analyses were conducted on the daughter minerals of melt inclusions utilizing electron microprobe (EPMA) and scanning electron microscope energy spectrums (SEM/EDS). Analyses on more than 231 points of 56 melt inclusions identified various minerals in inclusions,including quartz, muscovite, biotite, magnetite, wollastonite, birunite, rutile and silicate melts, etc. Daughter mineral assemblages vary in different inclusions. Elements of daughter minerals include Si, Al, Na, K, Ca, Mg, Mn, Au, Ag, Cu, etc.The discovery of melt inclusions in ductile shear zone gold deposits provided us a new basis for the study on the origin of this deposit type. The gold mineralization was associated with multi-stage silicate melts and fluids.