| 川西连龙夕卡岩型锡、银多金属矿床成矿地质特征 |
| 修订日期：2000-11-15 |
| 关键词:granite skarn Sn-Ag polymetallic deposit |
| 基金项目:科技部资助,编号969140305;原地质矿产部“九五”科技攻关项目(编号950200104) |
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| Metallogenic Geological Characteristics of the Lianlong Skarn Type Sn-Ag Polymetallic Deposit in Western Sichuan |
| 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. |
| QU Xiao-ming,HOU Zeng-qian,ZHOU Shu-gui.2001.Metallogenic Geological Characteristics of the Lianlong Skarn Type Sn-Ag Polymetallic Deposit in Western Sichuan[J].Acta Geoscientica Sinica,22(1):29-34. |
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