Formation of Podiform Chromitite Deposits:Review and Prospects
Chen Yanhong
Yang Jingsui
Abstract：As the characteristic ore deposits in ophiolites,podiform chromitite deposits mainly formed in the ultramafic section of an ophiolite complex.However,the following issues on podiform chromitite remain controversial:(1)crystal-melt separation;(2)residu-al of mantle partial melting;(3)melt-rock interaction.It is of particular importance to study the formation processes of podiform chro-mitite when large amounts of unusual minerals are found in podiform chromitite and its host rock peridotite.Petrogeneses of chromitite are reviewed in this paper.The pMELTS thermodynamic software was used to calculate the contribution of shallow mantle processes to the formation of podiform chromitite.Preliminary simulation results show that it is impossible to explain the formation of large-scale podiform chromitite deposits by individual mantle partial melting,mantle melt separation or tholeiitic melt-depleted mantle interaction processes,which implies that the podiform chromitite deposits may have been formed by multi-stage or deep mantle processes.Further researches are needed to be conducted on the origin of podiform chromitite deposits.
Keywords：crystal-melt separationpartial meltingmelt-rock reactionpodiform chromititeophiolitepetrology
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：20( 991-1010 )