Comparison Of Metallogenic Processes And Tectonic Setting Between Jinchuan And Kalatongke Deposits

Jinchuan and Kalatongke are two of most famous large copper-nickel sulfide deposits all over the world, they have located in two different mineralization structure environments, that is, Jinchuan deposit occurs at rift environment which born in ancient plate boundaries, and Kalatongke produced in the post-orogen fold environment. For such kinds output of copper-nickel ore in the mafic-ultramafic rocks, the Jinchuan’s rock group have the highest basic degree, but Kalatongke have the lowest basic degree; Cu/Ni ratios of these two deposits is also different, Jinchuan is 0.5, while Kalatongke is 1.7; that means Jinchuan deposit in the mineral content of Ni-based, Kalatongke deposits in mineral content of Cu based. These differences suggest that these two deposits have a big differences in terms of the source material and mechanisms of mineralization.Refered the previous article and based on research data, the author summarized that Kalatongke and Jinchuan borned in two deferent tectonic environments and that their geochemical characteristics of the distribution of deposits is also deferent. And author also studied their rock series, mineralization parental magma, magma source characteristics and crustal contamination issues. Finally, by the means of three-dimensional geological modeling, author studied both deposits distribution in space and predicted that in their deep magma channels may exist in this category rich and little magmatic copper-nickel sulfide body. All of these studies mentioned above may helpful in later ore deposits exploration, and author finally come to the following conclusions:(1) The metallogenic epoch of Jinchuan deposit is Neoproterozoic, and Kalatongke is Late Palezoic; The tectonic setting of Jinchuan deposit is rift environment of continental margin, and Kalatongke is formed in extension environment during Post-orogenic; All these phenomenon is consistented with the temporary and spatial distribution of Ni-Cu deposits. Parent magmas of both two deposits are high-Mg basaltic magma;their magma sources are enriched continental lithospheric mantle and pleted asthenospheric mantle for the Jinchuan and Kalatongke repectively; ore bearing intrusions are multi period intrusive batholith magma,they have suffered different degrees of crustal contamination, and sulfide mainly melting in deepth, then contain enough olivine and sulfide crystal mush and penetrated into crust and mineralized.(2) With the study of mineralization model of Jinchuan and Kalatongke deposits,that is,magma liquation in deep-pre enrich-multi-peneration model,and have refered magma conduit model, we argued that deep geological progress-pre enrich model is the main metallogenic dynamics in China.(3) With the study of the geochemical characteristics and geological and three-dimensional space features of the Kalatongke and Jinchuan deposits, predicting that concealed rich-deposit may present at its depth; For Jinchuan deposit, due to its complex structure and tectonic setting environment, thus leading to its deep structure is more complex, and deep prospecting work is not satisfactory; For Kalatongke deposit, due to its deep xenoliths may have a large baking edge formations, thus its similar to 1st and the 2nd deep mine in Jinchuan ore deposits, in the Kalatongke its deep presence such large ore body is also possible.