安徽铜陵大团山铜矿床层状矽卡岩矿_省略_矿Re_Os年龄测定及其地质意义_梅燕雄.pdfVIP

2005 8 Aug . 2005 26 4 : 32 -331 ACTA GEOSCIENT ICA SIN ICA 26(4) : 32 -331 Re-Os 1) 1, 2) 1) 3) 梅燕雄 毛景文 李进文 杜安道 1) , , 10003 ; 2) , , 100083; 3) , , 10003 , Re-Os , 40 39 139. 1 2. Ma, 138.0~ 140. 8 Ma Ar/ Ar 135. 8~ 139. 8 Ma , ( ) Re-Os Re-Os Dating of Molybdenite from Stratiform Skarn Orebodies in the Datuanshan Copper Deposit, Tongling, Anhui Provin e, and Its Geologi al Signifi an e 1) 1,2) 1) 3) MEI Yanxiong MAO Jingwen LI Jinw en DU Andao 1) I nst it ut e of M i neral Resour ce , CA GS , Beij i ng, 10003 ; 2) Chi na Univ ersi ty of Geosciences, Beij i ng , 100083; 3) N ational Research Center of Geoanaly sis, CA G S , Beij i ng, 10003 Abstra t T he Datuanshan copper deposit in Tongling, Anhui Province, is located in the middle section of the Middle and Low er Yangtze Valley iron-copper metallogenic belt. The metallogenic epoch of the deposit was previously regarded as Yanshanian on the ba- sis of the ages of intermediate-acid intrusive rocks related to t he ore-forming process. The authors collected 6 molybdenite samples from stratiform skarn orebodies in the Datuanshan copper deposit for Re-Os precise dating. The isochron age is 139. 1 2. Ma, and t he Re-Os model ages vary from 138.0~ 140. 8 Ma. These age data are concordant with 40Ar/ 39Ar ages, 135. 8~ 139. 8 Ma, of the ore-forming intermediate-acid intrusive rocks. The Datuanshan copper deposit and the copper-sulfur-gold deposits in Tongling area are products of Mesozoic large-scale metallogenic process in East China, coupling w it