新疆东准噶尔野马泉构造蚀变脉岩型金矿床  

Yemaquan gold deposit:a structurally-controlled-altered-dyke type in eastern Junggar,Xinjiang.

作　　者：王京彬[1] 王莉娟[1] 王玉往[1] 朱和平[2] 

机构地区：[1]北京矿产地质研究院,北京100012 [2]中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京100029

出　　处：《岩石学报》2006年第9期2349-2359,共11页Acta Petrologica Sinica

基　　金：国家重点基础研究发展规划(200lcB409806);中国科学院矿物资源研究重点实验室的资助.

摘　　要：野马泉金矿位于新疆准噶尔野马泉断块内,区内出露地层主要为志留系的浅变质舍碳碎屑岩类。矿体产在破碎蚀变的闪长玢岩脉及其边侧的片理化围岩中,与成矿有关的蚀变主要为硅化、绢云母化和毒砂-黄铁矿化。稀土元素、流体包裹体和同位素等研究表明,野马泉金矿的形成与闪长质岩浆作用密切相关。闪长质岩浆同化吸收了含碳质和黄铁矿的围岩,使岩浆中的金大量进入流体相,而演化成含矿热液。金矿化的闪长玢岩中锆石 U-Pb 一致年龄为252.5±1.8Ma 和254.5±0.9Ma,代表了新疆北部后碰撞构造-岩浆-成矿活动末期的产物。与野马泉矿床类似的金矿床,在准噶尔及邻区点多面广,其成矿特征介于构造蚀变岩型金矿和与侵入岩有关的金矿床之间,应属一新的金矿(亚)类型-构造蚀变脉岩型。The Yemaquan gold deposit is located in Yemaquan block of eastern Junggar. The dominant strata within the area are Silurian low-grade metamorphic carbonaceous clastic rocks. Orebodies occur in fractured and altered diorite-porphyry dyke and its sheared contact wallrocks. The dominant alterations related to gold mineralization are silicification, sericitization and arsenopyrite- pyritization. Data on REE, fluid inclusion and isotopes show that the Yemaquan gold deposit is genetically associated with diorite magmatism. The ore-forming fluid mainly originates from the magma differentiation, which released gold-bearing fluid phase when the diorite magma digested pyrite-bearing carbonaceous wallrock. U-Pb concordant ages of 252. 5 ± 1.8Ma and 254. 5 ±0. 9Ma from zircon of gold mineralized diorite-porphyry are corresponding with the last tectonic-magmatic-mineralization stage of post-collision in the northern part of Xinjiang. Similar gold deposits are widely distributed in the Junggar and its adjacent area. These deposits possess transitive characteristics between structurally-controlled gold deposits and intrusion-associated type. Thus, they may classified to be a new （sub-） type of gold deposits： structurally-controlled-altered-dyke type.

关 键 词：野马泉金矿床 库普苏金矿床 构造蚀变脉岩型 成矿流体 东准噶尔 新疆 

分 类 号：P618.51[天文地球—矿床学]