大义山锡矿田矿床地质特征及矿床成因  

Geological characteristics and origin of the Dayishan tin orefield in Nanling region

作　　者：周厚祥[1] 杨贵花 蒋中和 陈强春 

机构地区：[1]中国地质大学,武汉430074 [2]湖南省地调院湘中所,湖南娄底417000 [3]湖南省地勘局,长沙410000 [4]湖南长沙地质矿产研究所,长沙410000

出　　处：《华南地质与矿产》2005年第2期87-94,共8页Geology and Mineral Resources of South China

基　　金：中国地质调查局国土资源大调查项目(199910200220).

摘　　要：大义山花岗岩体北体是矿田锡矿的主要成矿岩体,属燕山晚期“S”型酸性铝过饱和花岗岩,被动侵位于郴州-邵阳深断裂带走滑作用形成的剪切拉张桥区。岩浆自南东向北西侵位。区内锡矿可分为二类六型,具集中、成带分布的特点,总体具岩浆热液成矿的特征。各类型锡矿床的时空分布,具正向分带性,且与岩浆侵位方向相对应。成矿时代主要有二期,即燕山晚期早阶段和晚阶段,且以前者为主。构造以分级形式控矿,矿床剥蚀程度北高南低,认为矿田南部具有较大的找矿潜力。The tin-mineralized north Dayishan granite body is a S-type granitic intrusion emplaced from southeast towards northwest along the Chenzhou-Shaoyang deep-seated fault zone. Tin deposits in the Dayishan orefield are magmatic hydrothermal origin,including two types and six subtypes,they concentratedly distribute along the structural belts and correspond to magmatic intrusion direction. The orefield endured Early Yanshanian and Late Yanshanian mineralization controlled by different grades of structures and shows higher denudation degree in northern area. So,the southern area of the orefield has excellent prospecting potential for concealed tin orebodies.

关 键 词：花岗岩 锡矿 控矿规律 找矿潜力 大义山 

分 类 号：P618.44[天文地球—矿床学]