Seminar

The genesis of the orogenic gold deposits in the Liaodong Peninsula, North China Craton (NCC), is essential for gold exploration in this area and yet remains disputed. Though most researchers link gold mineralization with magmatism and/or metasomatized mantle beneath the NCC, this study here, instead, considers that metamorphic devolatilization of the Paleoproterozoic Liaohe Group could account for the formation of the Mesozoic gold deposits in the Liaodong Peninsula. Three representative gold deposits, i.e. Baiyun, Wulong, Xinfang, are studied. This study is innovative because we integrate traditional research methods including geological characteristics, fluid inclusion microthermometry, stable S-O isotopes, and radiogenic Sr-Nd isotopes, with non-traditional Fe-Li isotopes. Specifically, Fe and Li isotopic modelling in a metamorphic devolatilization model constrain metasediments and metabasalts of the Liaohe Group as sources of the Baiyun and Wulong gold deposits, respectively. This study here has broadened the application of Fe-Li isotopes on the genesis of orogenic gold deposits.

Additional information: Mr. Shuaijie LIU, u3006957@connect.hku.hk