摘要
连龙夕卡岩型锡银多金属矿床作为义敦岛弧锡银矿化的典型代表 ,成矿作用主要发生在夕卡岩化阶段 ,矿床类型属钙夕卡岩型Sn Ag Bi多金属矿床。S、Pb同位素研究表明 ,矿床中成矿物质主要来自花岗岩体。
In Late Yanshanian movement, Yidun arc evolved into the arc-continent collision stage, and a large-scale post-orogenic A-type granitic magmatic activity occurred behind the arc area, accompanied by widespread Sn-Ag polymetallic mineralization. As a typical example of Sn-Ag polymetallic mineralization, the Lianlong skarn-type Sn-Ag polymetallic deposit consists of four ore-forming stages accompanied by five types of alterations, viz., alkaline metasomatism, skarnization, greisenization, phyllic sericitization, and marbleization. The four metallogenic associations are cassiterite, cassiterite + native bismuth + polymetal sulfides, cassiterite + scheelite + sulfides and pyrite + sulfides The ore-forming process was completed mainly at the skarnization stage. The deposit is of calc-skarn Sn-Ag-Bi polymetallic type. Sphalerite, galena, chalcopyrite and arsenopyrite from the deposit give δ 34S values of -9.5‰, -9.9‰, -10.4‰ and -10.5‰ respectively, being very close to the δ 34S value of granite (-8.1‰). Pb isotopic measurement of ores gives 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb of 18.6184～18.7099, 15.6300～15.738, and 38.8126～39.126 respectively, consistent with the granite values (18.9585～19.206, 15.6534～15.7066 and 38.9267～39.2110). All these data indicate that the ore-forming matter was mainly derived from the granite.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2001年第1期29-34,共6页
Acta Geoscientica Sinica
基金
科技部资助!编号 96 914 0 3 0 5
原地质矿产部"九五"科技攻关项目! (编号95 0 2 0 0 1 0 4)
