金堆城斑岩钼矿床地质地球化学特征及成因  

GEOLOGICAL GEOCHEMICAL CHARACTERISTICS AND GENESIS OF THE JINDUICHENG PORPHYRY MOLYBDENUM DEPOSIT,SHANXI PROVINCE

作　　者：徐兆文[1] 杨荣勇[1] 陆现彩[1] 任启江[1] 

机构地区：[1]南京大学地球科学系

出　　处：《地质找矿论丛》1998年第4期18-27,共10页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金;南京大学内生金属矿床成矿机制研究国家重点实验室资助项目

摘　　要：金堆城斑岩钼矿是东秦岭超大型钼矿带内最重要钼矿床之一，该矿床的形成与中生代花岗斑岩有关，且岩体顶部发育了典型的钾长石石英条纹岩。矿区内含脉率和裂隙发育程度可作为矿化强度的一个重要标志。成矿流体研究表明主要成矿阶段温度为２００°Ｃ±；成矿流体含盐度具有双配分模式特征，盐度介于２７５～４２５ｗ（ＮａＣｌ）ｅｑ％和０６１～１７ｗ（ＮａＣｌ）％两个区间之内；成矿流体成分以富Ｃｌ－、Ｋ＋、ＳＯ２－４、贫Ｆ－、Ｎａ＋、ＨＣＯ－３为特征。稳定同位素研究表明δ３４Ｓ‰介于１２３～４３４之间；δ１８Ｏ‰介于１１８３～８５９之间，δＤ‰介于５７２２～１２０６９之间；稳定同位素数值说明成矿热液早期以岩浆热液为主。Jinduicheng porphyry molybdenum deposit is one of the most important in the East Qinling Large molybdenum metallogenic belt.The porphyry molybdenum deposit is associated with a Mesozoic granite porphyry.There is potash feldspar quartz crenulate on the top of the granitc porphyry.In this paper,authors point out that the fissure abundances and developing degree of the fissure are important indicators of mineralization scale.The ore forming temperature is 200°C±.The salinity of mineralizing solutions manifests bimodal distribution pattern with two ranges from 27 5 to w(NaCl)eq 42 5% and from 0 61 to w(NaCl)eq 17% equiv.The composion of inclusion is characterized by rich in Cl -,K +,SO 2- 4 and poor F -,Na +,HCO - 3.The data of sulphur,oxygen and hydrogen have δ 34 S range from 1 25 to 4 34‰,δ 18 O ranges from 11 83 to 8 59‰,δD ranges from -57 22 to-120 69‰.These isotopic data suggest that the ore forming fluids and materials were originated mainly from the magma system.But there entered meteoric water at late stage.

关 键 词：斑岩钼矿床 地质地球化学 矿床成因 钼矿床 

分 类 号：P618.650.4[天文地球—矿床学] P618.650.2[天文地球—地质学]