张家坪子金矿地质特征初探

四川省冕宁县张家坪子金矿产于T2.3的一套绿片岩、变质玄武岩、火山角砾岩夹蚀变交代白云岩中的矿床,受金河—程海深断裂影响,金矿化主要位于蚀变带内.经燕山中晚期深源的富Au的多金属地幔流体侵入,在构造有利部位发生交代作用,使Au进一步富集,至喜山期,又发生一次富金热液作用,在有利部位进一步加富而形成矿体.

GEOLOGY OF THE ZHANGJIAPINGZI GOLD DEPOSIT

The Zhangjiapingzi gold deposit of Mianning County, Sichuan province is located in a set of green schist series, altered basalt and volcanic breccias containing metasomatic- altered dolomite of T 2-3. Gold mineralization occurs mainly in alteration zones due to the influence of the Jinhe- Chenghai fault. Through researches, the metallogenic materials of this deposit are derived from deeper part of the earth, which underwent intrusion of deep polymetal and Au-rich mantle fluid in Middie-Late Yanshanian period, resulting in metasomatism and enrichment of Au occurring at favorable structures. During the Himalayan Epoch, a hydrothermal process causing Au enrichment occurred again, which formed gold deposits at some favorable positions by enrichment further.