大别山北麓钼矿类型及地质特征浅析

Analysis of metallogenic types and geological characteristics of the molybdenum deposits in the northern edge of Dabie mountain range

大别造山带北麓新发现有大、中型钼矿床十余个,是我国继东秦岭和东北钼矿带后又一重要钼金属矿集区。文章结合最新勘查资料,综合论述了大别山北麓钼矿带矿床的分类和基本特征。大别钼矿带沿区域构造线呈近东西向狭长带状展布,集中分布于河南桐柏天目山至安徽金寨沙坪沟地区;其形成多与燕山期中酸性浅成—超浅成小花岗斑岩体有关,钼矿床主要产于岩体内外接触带及其附近;矿床类型主要为斑岩型和少量夕卡岩型、热液脉型、角砾岩型,每种矿床类型都有与之对应的基本地质特征。

More than ten medium and large sized molybdenum deposits are newly discovered in the northern edge of the Dabie orogenic belt,which form an important molybdenum metallogenic zone following the East Qinling and the Northeastern Qinling molybdenum metallogenic belts.In this paper,the classification and basic characteristics of the molybdenum deposits in the northern Dabie orogenic belt according to the latest exploration data were introduced.The Dabie molybdenum metallogenic belt strikes nearly East-West along the regional tectonic trend,and distributed in the Tianmu mountain,Tongbai of Henan Province and Shapinggou area,Jinzhai of Anhui Province.The Dabie molybdenum orebodies occur in the inner and outer contact zones of granitic porphyry and its vicinity,the intrusions are mainly intermediate-acid shallow to ultra-shallow porphyry of Yanshanian period.The molybdenum deposit type is dominated by the porphyry type Mo deposit,and minor deposit types include skarn type,hydrothermal vein-filling type,and breccia type,each kind of the molybdenum deposit has its corresponding geological features.