贵州锦屏地区金矿地球化学特征与成矿物源分析

Geochemical Characteristics and Minerogenetic Source Analysis of Gold Deposits in Jinping Area,Guizhou Province

对贵州锦屏石英脉型金矿赋矿地层岩石地球化学分析结果表明,该区金矿赋矿层位新元古代下江群再瓦组—隆里组地层中Au元素含量一般低于上地壳背景值,并随地层由老到新其含量大致具有逐渐减少的特点,但Au及其共伴生元素的富集对地层、岩性并无明显的选择性。金矿石中黄铁矿及毒砂硫同位素分析结果显示:δ^34 S介于-0.79‰~5.93‰之间,大部分与上地幔基性—超基性岩δ^34 S值相近,少量与中酸性岩相近,表明成矿物质主要来源于上地幔。

The results of petrochemistry analysis of the gold bearing strata of Jinping quartz vein type gold deposit in Guizhou Province show that the gold bearing strata in this area are generally lower than the background value of the upper crust in the strata of Zaiwa Longli formation of the Neoproterozoic Xiajiang group,and the content of Au in the strata decreases gradually from old to new,but the enrichment of Au and its associated elements has no obvious choice for the strata and lithology。The results of sulfur isotopic analysis of pyrite and arsenopyrite in gold ore show that δ^34 S is between-0.79‰ and 5.93‰.Most of them are close to the δ^34 S value of the basic ultrabasic rocks in the upper mantle,and a few are close to the intermediate acid rocks,indicating that the ore-forming materials are mainly from the upper mantle.