The preliminary discussion on diapir structure - lithofacies zonation model for the Fengshan copper deposit, Yimen area, Yunnan, China

On the basis of studying the features of the Yimen Fengshan copper deposit, by applying diapir structure-petrographic mapping method, the ore-bearing-type diapir identification marks, material composition, diapiring type, internal structure, tectonic banding characteristics have been dissected. By contrasting ore-bearing-type and non-ore-bearing-type diapir, the construction of ore-bearing-type diaper structure-lithofacie zonation pattern has been set up. From diapir →gray silicified dolomite →blue gray dolomite, the model appears in turn diaper rock facie zone and altered rock facie zone, that is, the volcanic breccia facie zone → slate breccia facies zone with volcanic rock→strong copper mineralizational gray silicified dolomitic cataclastic rock facie zone→copper mineralization cataclastic dolomite facie zone →weakly silicified dolomite facie zone. The main ore-bodies occur in the strong copper mineralizational gray silicified dolomitic cataclastic rock facie zone and copper mineralizational cataclastic dolomite facie zone. The mineral association of metal sulfides and ore structure also showed the horizontal zoning: chalcopyrite + bornite association, massive and stockwork structures→chalcopyrite + bornite + chalcocite (less) association, densely disseminated and vein structures→chalcopyrite +pyrite + bornite (less) association, small-vein and scattered point structures.