摘要
粤湘两省燕山期的锡矿斑岩,产在3个地质特征不同的聚集区和两种大地构造环境中,形成两种成因类型,这是中生代太平洋板块俯冲影响强弱不同的结果。其形成具有较晚的演化形成史,可以是锡矿花岗岩体的附属部分或为次火山岩,可与隐爆角砾岩共生,在隆起区和凹陷区均有产出,并受断裂控制,位大断裂一侧附近。斑岩锡矿多由高温气化热浪所成,成矿蚀变以黄玉-石英云英岩化较为常见,围岩成分能影响矿体与蚀变带矿物成分,岩体与矿体有直接或间接的成因关系。
The Yenshanian porphytries bearing the tin deposit in Guangdong andHunan occur within three districts with different geological characteristicsand in two different geotectonic citcumstances. They belong to two genetictypes as a result Pacific Ocean plate subduction into the Asia continentwith different effects. These porphyries have later evolution history andmay be both a small part of the granite body bearing the tin deposit andsubvolcanic rocks. They have paragenesis relation with the explosionbreccias in some places occurring both in upwarped and sag districts andalways controlling by the fracture near the great fault. In general, porphyrytin deposits are pneumato-hypothermal ones and their alterations of mine-ralization are topaz-quartz greisenization. The materials of wallrockmay affect the mineralogical compositions of the tin orebody and thealteration zone. The genetic connection between the porphyry and the tindeposit is direct or indirect.
基金
国家自然科学基金资助项目[(84)科基金地准字第009号]中的部分内容
关键词
锡矿
斑岩
成岩
成矿
tin deposit
porphyry
magmatism
metallogenesis
Yenshanian
Guangdong
Hunan
