Observation and Analysis of Diagenesis and Mineralization Structures of the Jinchuan Cu-Ni Sulfide Deposit in Gansu
The Jinchuan giant Cu-Ni sulfide deposit in Gansu formed during the Neoproterozoic.From the ini-tial emplacement of its parent magma to subsequent tectonic superposition,this deposit has undergone a complex geological evolution.Despite the fact that many previous studies have been conducted,significant controversy regarding the tectonics of the deposits still remains.Furthermore,it is of great significance to clarify the rock-and ore-controlling structures for magma intrusion and its emplacement processes,as well as to prospect for ore deposits at depths.In this study,we analyzed the stress field based on the classification,correlation,cross-cut-ting relationships,and chronological sequence of structures in the deposit area,using nodal production statis-tics.In the end,we determined three primary compressive stress directions:N-S,NE-SW,and NNE-SSW.Finally,by integrating regional and mining tectonics,we concluded that there are six stages of tectonic evolution in the Longshoushan area:Lüliang,Jinning,Caledonian,Hercynian,Yanshan,and Himalayan.We also es-tablished a model of tectonic evolution for the Jinchuan Cu-Ni sulfide deposit,including the pre-,syn-,and post-mineralization stages.The model for the tectonic evolution of the Jinchuan Cu-Ni sulfide deposit illustrates the emplacement of parental magma to form the deposit,providing new insights into mineral prospecting in both within the deposit and in its periphery.
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