四川“三江”地区嘎衣穷火山成因块状硫化物矿床的地质特征及找矿模型  

GEOLOGICAL CHARACTERISTICS AND PROSPECTING MODEL OF GAYIQIONG VOLCANIC-HOSTED MASSIVE SULFIDE DEPOSIT IN THE SANJIANG REGION,SICHUAN

作　　者：朱华平[1] 

机构地区：[1]国土资源部成都地质矿产研究所,成都610081

出　　处：《地质与勘探》2007年第6期36-41,共6页Geology and Exploration

基　　金：中国地质调查局项目(编号:200310200008)资助

摘　　要：嘎衣穷矿床是四川"三江"地区的一个典型火山成因块状硫化物矿床,产于"三江"义敦岛弧系德格—乡城主弧带中。矿床形成受主弧带中晚三叠世赠科裂谷盆地控制,盆地中发育典型的裂谷型"双峰式"火山岩组合序列,嘎衣穷多金属矿(化)体主要产于"双峰式"火山岩组合序列的酸性端元组分中,具有块状硫化物矿床的地质特征。岩石地球化学研究表明矿区内勉戈组火山岩属铝过饱和类型,具有岛弧火山岩的特征,呈现多旋回、多期次喷发的特征,在喷发间隙期均伴有多金属矿化,形成嘎衣穷多金属矿(化)体。文章在总结矿床的地质特征其础上,建立了嘎衣穷矿床的找矿模型。Gayiqiong deposit is one of the typical volcanogenic massive sulfide deposit in the Sanjiang region, Sichuan providence. The deposit lies in the Dege - Xiangcheng main arc belt of Yidun island arc, Sangjiang. Formation of the deposit is controlled by late Triassic Zengke rift basin in the island arc. Bimodal volcanic suites are extensively developed in the basin. Gayiqiong poly - metallic deposit is mainly hosted in the acidic volcanic rocks （ dacitic - rhyolitic tuff） within the bimedal suite, showing typical features of massive sulfide deposit. Ore - bearing rock series are volcanic rocks in the Miange formation. Based on petrochemistry results, volcanic rocks are similar to island arc, showing multi - cycle and multi - periodic activity. Polymetallic mineralization always occurs in the waning and interim stages of volcanic eruption. Finally, based on summarizing the geology characteristic, the prospecting model for Gayiqiong deposit is established, which is of great significance in the next step reconnaissance.

关 键 词：义敦岛弧 嘎衣穷 块状硫化物矿床 双峰式 找矿模型 

分 类 号：P618.4[天文地球—矿床学] P618.5[天文地球—地质学]