Molybdnite Re-Os Age of Diaoquan Silver-Copper Polymetallic Deposit in Shanxi Province and Its Geological Significance
详细信息
- 责任者：Niu Cuiyi (School of Earth Science and Resource ; China University of Geoscience ; Beijing 100083 ; China) ; Qing Min
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(5)
- 关键词：铜矿 ; copper ores ; 铼—锇计时 ; Re-Os dating ; 山西 ; Shanxi Province
- 页码：p.972-978
- 图表：3 illus., 2 tables, 31 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
In order to date the metallogeny of the Diaoquan silver-copper polymetallic deposit,the authors selected and analyzed six molybdnite samples from this ore deposit.The Re-Os isotopic model ages range from 130.5 Ma to 132.8 Ma,with an isochron age of(131.9±2.9)Ma(MSWD=1.7)and an weighted average age of(132.01 ±0.85)Ma(MSWD=1.05).The molybdnite was formed at 132 Ma,later than the formation of copper minerals.The rock-forming and ore-forming processes of the Diaoquan silver-copper polymetallic deposit took place simultaneously with the Yanshanian volcanic and subvolcanic activities in northeastern Shanxi,which suggests that the sub-volcanic rocks had close relationship with metallogeny and provided metallogenic matter and heat for the Diaoquan silver-copper deposit.The Diaoquan silver-copper polymetallic deposit was formed during the largescale metallogenic activity in the northeast platform and occurred in a continental intraplate tectonic setting.As a result of re-activation of ancient orogeny under the background of thinning of the deep lithosphere,the Diaoquan deposit was formed during the transformation of tectonic regime in the east of the northeast platform.