辽宁宽甸万宝源钼矿地质特征及成因机制

Geological characteristics and ore-forming mechanism of Wanbaoyuan Mo deposit in Kuandian,Liaoning Province

辽宁宽甸万宝源钼矿位于燕山期石柱子花岗闪长岩体与寒武纪碳酸盐岩地层的接触部位。钼矿体依其围岩岩性和构造位置的不同可以分为石英斑岩裂隙型、花岗闪长岩裂隙型和破碎蚀变带石英脉型。硫、氢、氧同位素的测试结果及分析表明成矿物质主要来自重熔的深部硅铝质地壳,成矿流体以岩浆水为主,并混有古大气水。该区存在两期成矿:Ⅰ期形成矽卡岩型Cu-Fe矿体;Ⅱ期形成斑岩型和石英脉型Mo矿体,以斑岩型为主。两期成矿均为岩浆期后热液的产物。

Wanbaoyuan Mo deposit in Kuandian County,Liaoning Province located in the contact region between Shizhuzi granodiorite in Yanshan stage and Cambrian carbonate formation.Mo ore bodies are divided into quartz porphyry fissure,granodioritic fissure and cataclastic alteration zone quartz vein types according to surrounding rock properties and structural location.Test results and analysis of S,O,D isotopes show that metallogenic minerals come from remelting salic crust and ore-forming fluids are mainly from magmatic water mixed with a little ancient meteoric water.There are two stages of ore formation in this region： skarn type Cu—Fe deposits（Ⅰstage）;quartz vein and porphyry types Mo deposits（Ⅱstage）,mainly is porphyry type,and both of them are the products of postmagmatic-thermal fluid.