摘要
拔茅银矿是浙东中生代火山岩带中近几年新发出的金银矿田,矿床发育于破火山口机构内,矿体主要受NW及近SN向张性硅化破碎带控制。矿床的各种特征表明,其成因属浅成低温热液型。
Bamao auriferous silver deposit is recently discovered in the southeastern flinge of Xinchang volcano-tectonic depression within the Mesozoic volcanic zone in the coastal region of Zhejiang. The exposed rocks in Bamao area are mainly intermediate-acidic volcanic rocks of Upper Jurassic-Lower Cretaceous which are rich in Ag, Pb, Zn, Sb etc. to some extent. The distribution of the ore bodies and the ore deposit is controlled by a caldera and fractures (mainly in NW and S-N direction).
All the ore bodies are vein-lens in shape and occur in the silicified crush belts within the volcanic rocks. The ores are composed of quartz, sulphides and sulphosalts.
The study of fluid inclusions and sulphur, lead, hydrogen and oxygen isotopic compositions shows that the ore-forming temperatures are about 110-290℃ , the ore forming solution is the mixed solution of magmatic and meteoric water and the ore forming elements were come from some sources.
It is evident that Bamao auriferous silver deposit is an epithermal deposit
出处
《资源调查与环境》
1990年第1期38-53,共16页
Resources Survey & Environment
关键词
浅成低温热液银矿床
浙江
Epithermal silver deposit, Bamao, Zhejiang.
