吉林二密复式火山机构及成矿控制作用

以松顶山为中心的二密复式火山机构,受东西向基底断裂与近南北向壳断裂叠加部位控制.中心(松顶山一带)为先期闪长质次火山岩侵入,闪长质岩体边缘接触带附近发育寄生火山口(次一级),并充填花岗质次火山小岩株,构成破火山机构环状构造(内环).二密铜金矿床各矿段主要铜矿体集中于花岗质岩体内及其附近,总体分布和方向又受接触带构造控制.结合区域成矿规律,通过成岩成矿关系研究表明,本矿床除铜矿外,还具有金的找矿前景,并给出了该矿床的成矿模式.

Composite Volcanic Apparatus and It's Ore-Controlling Significance in the Ermi Area, Jilin Province

The Ermi composite volcanic apparatus is located at the Songdingshan,the intersecting portion of an EW and NS trending crustal faults.Firstly the site was invaded by the subvolcanic rocks(diorite),then the marginal contact zones of these diorite served as the sites for the parasitical,subordinate volcanic vents,which were filled with granite stock and made up the inner circular of the composite volcanic apparatus.Though the main copper mineralization of the area is located in these granite stocks and their adjacent host rocks,the general strike and distribution of the copper mineralization in the area is controlled by the contact zones of the diorite.Combined with the regional metallogenic rules,the study on the relationship between the rock and ore formation reveals that gold mineralization is also significant besides copper ores in the area.The metallogenic model of the Ermi copper-gold ore deposit has also been set up.