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SHRIMP U-Pb Zircon Ages of Granitoids in the Wulashan Gold Deposit,Inner Mongolia,China:Timing of Mineralization and Tectonic Implications

SHRIMP U-Pb Zircon Ages of Granitoids in the Wulashan Gold D...

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中国科学院地质与地球物理研究所2003学术年会

作者： NEAL MCNAUGHTON DAVID I.GROVES and mincuo zhai Center for Global Metallogeny Department of Geology and GeophysicsUniversity of Western Australia Center for Global Metallogeny Department of Geology and GeophysicsUniversity of Western Austrlia Institute of Geology and Geophysics Chinese Academy of Sciences

The Wulashan gold deposit,situated along the northwestern margin of the North China craton (NCC),is hosted by ductile-brittle faults within Archean metamorphir volcano-sedimentary rocks of the Wulashan *** deposit is characterized by gold-bearing quartz-K feldspar and quartz *** granitoid batholiths and pegmatite dikes intruded the metamorphic basement rocks,and are spatially associated with gold *** genetic models have been proposed for the deposit due to lack of reliable age *** new SHRIMP U-Pb zircon ages for these intrusions now reveal important constraints on the mineralization time and tectonic evolution of this region. These intrusions contain inherited zircons of about 2.55 *** from the Wulashan basement that was intruded by pegmatite dikes at about 1.84 Ga:the latter probably are related to the major tectonic event leading to the final amalgamation of the *** basement subsequently underwent at least three tectono-thermal events during Phanerozoic time(at 353±7.169±*** 132±2 Ma). Combined with previous Ar-Ar and K-Ar ages,we suggest two gold mineralization episodes for the Wulashan gold *** first episode occurred at about 350 *** by ages of a gold-related fuchsite and the Dahuabei granitoid *** supports a previously proposed model that relates gold mineralization to the Dahuabei granite that formed during collision of the Paleo-Mongolian block with the *** second one occurred in the late Yanshanian period,as indicated by the mineralized K-feldspar-rich vein of 132±2 *** episode is simultaneous with those in the eastern *** of a widespread late Yanshanian metallogenic event that was a response either to the subduction of the Izanagi-Pacific plate beneath eastern China or to the removal of the Early Cretaceous lithosphere in the eastern NCC.

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