Rb-Sr age dating of quartz from Longtougou Au deposit in South Qinling area and the geological significance
Iongtougou Au deposit is located in the central Zhashui-Shanyang Au deposit-clustered area.It is tectonically controlled and hosted by barite-quartz vein and forms a major Au ore belt together with Wutiaogou and Kuanpinggou Au deposits discovered in the surrounding in resent years.Making clear of ore-forming ages will expand exploration targets.Rb-Sr age dating is conducted on fluid inclusion of quartz.The result shows that the Au deposit are resulted from late Indo-China hydrothermal activity.The ore-forming process started from about 266 Ma.The age dating of Wutiaogou Au deposit is 249 Ma±42 Ma.Along Shanfeng fault took place three major tectonic-magnetic hydrothermal activities since Hercynian epoch with rock-forming and ore-forming stages of 280 Ma-300 Ma,200 Ma-220 Ma and 140 Ma-160 Ma.The abundant hydrothermal fluid and intense hydrothermal activity provided not only huge volume of ore materials from depth but also controlled directly epoches and intensity and over printing of mineralization.Similar to other large Au deposits Longtougou Au deposit is the result of tectonic move-ment from Indo-China to early Yanshanian period representing Au ore-forming process in Indo-China period.
Longtougou Au depositRb-Sr isotopes of quartz fluid inclusionIndo-China epochore-forming periods in South Qinling area
国家科技期刊平台
NSTL
万方数据
