Mode of Occurrence of Gold in Micro-Disseminated Strata-Bound Sb-Au Deposits, Qinling Region, China  

作　　者：张复新 

出　　处：《Chinese Journal Of Geochemistry》1997年第4期374-382,共9页中国地球化学学报

摘　　要：Optical studies, backscattered electron images, secondary ion spectrometry and highprecision transmission electron imaging demonstrate that gold is strongly correlated with arsenic on a microscopic scale in the sediment-hosted micro-disseminated gold deposits. The positive correlation between Au and As, despite varying Au/As ratio, is persistent in arsenian pyrite overgrowths and arsenopyrite. It is found that gold occurs in native state as submicro beads in association with arsenic-bearing sulfides. The extremely small grain size of gold may indicate a very rapid process of deposition.Optical studies, backscattered electron images, secondary ion spectrometry and highprecision transmission electron imaging demonstrate that gold is strongly correlated with arsenic on a microscopic scale in the sediment-hosted micro-disseminated gold deposits. The positive correlation between Au and As, despite varying Au/As ratio, is persistent in arsenian pyrite overgrowths and arsenopyrite. It is found that gold occurs in native state as submicro beads in association with arsenic-bearing sulfides. The extremely small grain size of gold may indicate a very rapid process of deposition.

关 键 词：金矿床 秦岭地区 地层 微粒金 锑矿床 

分 类 号：P618.51[天文地球—矿床学] P618[天文地球—地质学]