CHARACTERISTICS AND METALLOGENIC FLUID AND THERMODYNAMIC CONDITION ANALYSIS OF METALLOGENIC SYSTEM IN HIGHLY STRAINED STRUCTURAL BELT, EAST JUNGGAR

The highly strained structural belts in some units of palaeo plate tectonics, products of subduction and collision of various scale plates in East Junggar, controlled the distribution of the majority of the endogenetic gold deposits and occurrences, turning into the most important gold metallogenic system in East Junggar. The epicontinental volcanic magma arcs and residual sea basins that occurred at the stages of the oceanic crust subduction and oceanic basin closure, and the epicontinental volcaniclastic sedimentary facies, the carbonaceous sedimentary facies and the melange ophiolite blocks that occurred on the subduction zone are all included in the geological bodies with higher Au abundance, constituting the potential source beds (bodies) in the mineralization system in the highly strained structural belt. The thermal energy produced by the tectonic movement and derived from the deep structure is a kind of energy resource resulting both from the violent deformation and metamorphism and from the Au activation in this mineralization system. The ore forming fluids, driven by the stress difference within the tectonic zone, migrated from the violent compression zones to the extension zones with relative lower pressure and stress, resulting in the concentration of the gold deposits (occurrences) near the transitional zones between these two structural belts. The gold bodies and veins thus occurred in the secondary faults and fissures derived from these structural belts.