南秦岭陕西酒店金矿区闪长岩脉时代、脆—韧性剪切带与成矿关系探讨

Discussion on the relationship of the age of diorite and brittle-ductile shear zone with the mineralization of Jiudian gold deposit in Hanyin county,Shaanxi,southern Qinling

酒店金矿区位于陕西省安康北部金矿田西段,区内闪长岩脉、脆—韧性剪切带发育。目前该区内已发现同类型金矿床10余处。文章针对酒店金矿床中出露的闪长岩脉利用(LA-ICP-MS)进行锆石U-Pb同位素测年,其年龄值为(187. 5±3. 8) Ma,时代为早侏罗世。结合区内印支晚期—燕山早期脆—韧性剪切带与金矿化关系,认为该地区闪长岩脉中不含金,仅为金元素富集提供了有利的物理化学环境。金矿(化)体多产于闪长岩脉上、下盘叠加同时期脆—韧性剪切带形成的褶皱片岩中。

Jiudian gold deposit lies in the western part of the north Ankang gold field in Shaanxi,where the diorite and brittleductile shear zone are developed.At present,more than 10 gold deposits of the same type have been found in this area.This paper conducted LA-ICP-MS zircon U-Pb analyses on samples of outcropped diorites of the deposits and found that the basalt andesite was formed during 187.5±3.8 Ma,belonging to the Early Jurassic period.It is believed that the gold is not included in the diorites of this area,which only provided a favorable physical and chemical environment for the enrichment of gold elements.The gold deposits（mineralizations） occur in the folded schist formed in the brittle and ductile shear zone of the same period.