Advances in Earth Science
Fang Weixuan. R&D on New Mapping Technology of Geochemical Lithofacies in Prediction and Exploration for IronOxide Copper Gold Deposits (IOCG)[J]. Advances in Earth Science, DOI: 10.11867/j.issn.1001-8166.2012.10.1178.
Tectonic lithofacies and breccia lithofacies of hydrothermal fluid were hosted in the synmagmaticbrittleductile shear zone around Fe-rich picrite -Fe-rich andesite, Ti-Fe-rich gabbro-Ti-Fe-rich diorite, and monzonite-iverniteintrusive body. All of these lithofacies are supposed to be ore-hosted lithofacies for ironoxide copper gold deposits (IOCG). In general, vertical zonation of altered lithofacies are as follows: The top altered lithofacies is calyization-sericitization-hematitization zone, and the middle altered lithofacies is potassic alteration lithofacies with tourmalinization and Fe-rich alteration lithofacies +breccia lithofacies of hydrothermal fluid, while the low sodic alteration lithofacies with Ferich alteration lithofacies+breccia lithofacies of hydrothermal fluid. However, tourmalinization lithofacies may be the center of pneumatolytic hydrothermal fluid around the tongueshaped intrusion of ivernite and monzodiorite. Largesuperlarge iron-oxide copper gold deposits (IOCG) are of multistage alteration lithofacies system superimposed by breccia lithofacies of hydrothermal fluid in different origins. Multistage of alteration lithofacies superimposed by heterochronousheterochemical potential lithofacies at the same place and excellent altered lithofacies of pneumatolytic hydrothermal fluid are exploration and predictionindicators for Large-superlarge ironoxide copper gold deposits.