今天是2017年09月23日

福建中生代钼矿的辉钼矿矿物学特征

DOI:10.3799/dqkx.2013.121

作者:王翠芝,刘文元

联系地址:福州大学紫金矿业学院,福建福州

摘要:福建中生代钼矿分布广泛,并伴生有一定的铼.通过系统研究福建中生代钼矿基本特征,总结出主要有斑岩型、岩浆期后热液型、火山热液型、构造角砾岩型(热液石英脉型)及少量矽卡岩型,选择坪地、上西坑、罗卜岭、马坑等4个典型钼矿进行重点研究.在野外地质调查、岩相学的基础上,进行了矿相学及辉钼矿矿石矿物学的系统研究,得出福建中生代钼矿中辉钼矿的晶体形态主要表现为颗粒较大(粗到中细粒),结晶度高,多呈片状、鳞片状、局部板状,多色性明显,个别矿区辉钼矿颗粒较小,结晶较差,多色性不明显;辉钼矿多型主要为2H,少量2H+3R型、3R型;辉钼矿矿物化学成分中微量杂质元素(包括Re含量,一般为(N~N×100)×10-6,并以(N~N×10)×10-6为主)较低.本区辉钼矿的这些矿物学特征说明其形成时的温度条件较高,多为中高温环境,其物源可能是壳幔混染源,且以壳源为主;中生代钼成矿在福建省内具普遍性,辉钼矿中的Re作为有益的伴生元素具有一定的综合利用价值.

关键字:福建省;中生代;辉钼矿;矿物;指示作用;地球化学

Mineralogical Characterstics of Molybdenite of Mesozoic Molybdenum in Fujian Province

Author:WANG Cuizhi, LIU Wenyuan

Author Address:College of Zijin Mining, Fuzhou University, Fuzhou

Abstract:Mesozoic molybdenum deposits are distributed widely in Fujian, and associated with a certain amount of rhenium. This study explores Mesozoic molybdenum deposits in Fujian. It is found by analysis of characteristics of ore petrology and mineralogy of molybdenite of typical molybnum deposits (Pingdi, Shangxikeng, Luobuling, Makeng, etc.) in Fujian Province, five types of the molybdenum deposits have been determined, including the porphyry type, the magmatic hydrothermal type, the volcanic hydrothermal type, the tectonic breccia type and a few skarn type. Our systematic field investigation and petrography study finds that the ores mainly have coarse-medium fine grain, platy texture, small amount of thick tabular texture; the ore mineral(only molybdenite) is of leaden color, obvious polychroism, 2H polymorph (a small amount of 2H+3R, 3R), low contents of impurities including Re((N-N×100)×10-6,most(N-N×10)×10-6),which indicates the ores formed in moderate-high temperature condition and the ore originates from crust-mantle mixed source (most crust source); Mesozoic molybdenum mineralization is of universality in Fujian province; and as a kind of accompanying elements, Re is of some comprehensive utilization value.

Keyword:Fujian Province; Mesozoic; molybdenite; minerals; indication; geochemistry

 

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作者简介:王翠芝(1965-),女,副教授,博士,主要从事矿床成矿规律及矿产开发利用方向研究.Email: Wcuizhi@163.com

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