摘要
石门沟钼矿辉钼矿(化)特征为燕山晚期由基性岩浆底侵作用而形成的二长花岗岩体和地表出露的的厚大石英脉体全岩含矿。分析了河南西峡县石门沟钼矿成因机理与成矿模式。认为石门沟辉钼矿化二长花岗岩是下地壳物质部分熔融作用形成的富含Mo元素的花岗质岩浆,由基性向酸性正向演化,后经岩浆结晶分异、同化混染作用,钼(钨)等金属矿物以熔离状态分布在岩浆矿房中;岩浆热液沿构造薄弱带上升到地壳浅部后,富水热流体分离,进入气成热液阶段,形成高中温纵横交错含钼脉体或含钼花岗岩体。石门沟钼矿成因类型为岩浆型、热液充填石英脉型辉钼矿床,与斑岩型有明显区别。
Molybdenite mineralization in the molybdenum ore at Shimengou （Xixia county, Henan province） is characterized by a mass of monzonitic granite formed by basic magma underplated during the late Yanshanian, and by a thick, large quartz-vein body of whole-rock ore exposed at the surface. This article examines the mechanism of molybdenum formation and a model for metallogenesis for the Shimengou ore. The molybdenite mineralization in the monzonitic granite is rich in Mo. The granitic magma was formed by partial melting of lower-crust material, which evolved from basic composition to acidic. The molybdenum （tungsten） and other metallic minerals became concentrated in the ore magma after the effects of magmatic crystallization differentiation and hybrid assimilation. The magmatic hydrothermal fluid rose into the shallow crust along structurally weak belts, and the fluid then separated and evolved into a pneumatolytic hydrothermal stage, forming the molybdenum-vein body and molybdenum granite rock mass at moderate-high temperatures. The genetic types of molybdenum ore in Shimengou are the magma type and the hydrothermal-filling quartz-vein type molybdenite deposits. These contrast with the porphyry type of ore genesis.
出处
《上海国土资源》
2013年第3期81-84,共4页
Shanghai Land & Resources
基金
中国地质调查局战略性矿产资源远景调查项目"河南米坪-龙王庙地区矿产远景调查"
关键词
矿产地质
辉钼矿
成因机理
成矿模式
岩浆结晶分异
mineral geology
molybdenite
genesis mechanism
metallogenic mode
magmatic crystallization differentiation
