Abstract:

The authors proposed that the Dayao copper deposit is of diagenesis reformation type based on mineral deposit geology, geochemistry and organic geochemistty. According to the research of the abundance, existence form, characteristics of organic matter under microscope and simulation experiment, the genesis relation between organic matter and copper mineral has been discovered. The roles of organic matter are not the same in different mineralization processes. It is characterised by organic matter adsorting copper during the formation of ore source beds, and bacterial reduction of sulfate and decomposition of organic matter to produce H₂S etc. during the process of diagenetic mineralization, but in the process of reformation mineralization it showed reducing action of CH₄ etc. which are produced by organic matter decomposition to SO₄^2-.