Mineralogical study on the magmatic rock in Cishan gold deposit, Tongling, China

Abstract

Present study consists the major and trace elements in minerals of clinopyroxene and zircon in the Baimangshan pluton using electron probe and in-situ LA-ICP-MS. The results reflect that the Baimangshan pluton is a transitional rock type from subalkaline series to alkaline series and may have developed at a transition setting, from active continental margin to intraplate tectonics. Parent magma is the underplating mantle-derived basaltic magma having similar composition to ocean island basalt(OIB). And the zircons were crystallized from the lower crust in which the basaltic magmas were less differentiated. Baimangshan pluton is an oxidation pluton. It is high in alkali, which is favorable for forming oxidation type skarn gold deposits. Magma may be the main source of the mineral matters.