东秦岭燕山期岩浆岩同位素特征与成钼钨矿的关系  

THE RELATIONSHIP BETWEEN ISOTOPIC CHARACTERISTICS OF YANSHANIAN MAGMATIC ROCKS AND MOLYBDENUM-FORMING TUNGSTEN ORES IN EASTERN QINLING MOUNTAINS

作　　者：周胜兴[1] 付恒一[2] 吴瑶 何芳蕊 ZHOU Sheng-xing;FU Heng-yi;WU Yao;HE Fang-rui(Geological Survey Institute,Henan Geological Mineral Exploration and Development Bureau,Zhengzhou 450000,Henan,Chin;No.2 Geological Surevey Institute,Henan Geological Mineral Exploration and Development Bureau,Zhengzhou 450000,Henan,China)

机构地区：[1]河南省地质矿产勘查开发局第一地质勘查院,河南郑州450000 [2]河南省地质矿产勘查开发局第二地质勘查院,河南郑州450000

出　　处：《中国钼业》2018年第4期31-35,共5页China Molybdenum Industry

摘　　要：东秦岭地区主要部分即洛南—豫西地区,对燕山期岩浆岩铷锶同位素、氧同位素、硫同位素三个大的方面进行了与成钼钨矿相关的系统研究。铷锶同位素研究结果,岩浆物质来源为壳幔混合岩浆但以地壳物质参与为主;氧同位素研究结果,岩浆演化中水的成分来源于岩浆水与地下水的混合产物;硫同位素研究结果,其成岩、成矿中的硫源主要来源于下地壳和上地幔,不具备改造型和S型花岗岩的特征;总体上说,同位素主要说明岩浆组成的物质来源以上地幔物质为基础,地壳物质参与较多,尤其是钼矿的物质来源主要来自于基底地层,在花岗斑岩岩浆熔融基底地层而形成自身演化的同时,地层中的钼(钨)元素又逐步富集于花岗斑岩岩浆内,在岩浆系统转化为热液系统的过程中,将矿物质通过含矿气水热液的开放系统广泛扩散于围岩中,从而形成岩浆期后热液钼(钨)矿床。Thine major aspects of rubidium strontium isotopes, oxygen isotopes and sulfur isotopes of Yanshanian magmatic rocks in Luonan-Western Henan area were systematically studied. The results of rubidium and strontium isotope study show that the magmatic material comes from the crust and mantle mixed magma, but the crustal material is the main somme; the oxygen isotope study results show that the composition of water in magma evolution comes from the mixture of magmatic water and groundwater; the sulfur isotope study results, the sulfur sources in the mineralization are mainly derived from the lower crust and the upper mantle, and do not possess the characteristics of altered modeling and S-type granites. In general, isotopes mainly indicate that the composition of the magma comes from more than the mantle material. In particular, the material source of molybdenum ore mainly comes from the basement strata. While the granitic porphyry magma melts to form its own evolution, the molybdenum （tungsten） elements in the strata are gradually enriched in the granitic porphyry magma. In the process of transforming magmatic system into hydrothermal system, minerals are widely diffused into surrounding rock through the open system of gas-hydrothemal solution containing ore, thus fomling post-magmatic hydrothermal molybdenum （tungsten） deposit.

关 键 词：东秦岭 燕山期 铷锶 氧 硫 同位素 岩浆演化 

分 类 号：TD164.2[矿业工程—矿山地质测量]