| The Shizishan copper deposit is located in the Yimen rift basin in the central Yunnan area of the Kunyang rift,which is a typical copper deposit in the Yimen ore field.Based on the study of the ore-forming geological characteristics of the deposit and the application of large-scale structural lithofacies mapping method,the deep structural ore-control regularity of Shizishan copper deposit is studied,the ore-control structural characteristics are analyzed,and the ore-control model of the deep structure of the deposit is established;through the zircon U-Pb geochronology of diabase and the Re-Os isotopic geochronology test and analysis of chalcopyrite bornite,the intrusive age of diabase in the deposit is determined The metallogenic age of the mining area,the model of prospecting and prediction is established based on all the information.The main achievements of this paper are as follows:?1?The deposit is strongly controlled by tectonics and is one of the typical and tectonically controlled deposits in Yimen area.Based on the analysis of the structural characteristics of ore control in the mining area,the formation of the ore body is mainly controlled by NE faults,and it is destroyed by NW faults in the late stage.In the NW limb of the Shizishan anticline,there is a pierced structure,which is the main ore-forming structure of the No.1 main ore body and No.8 drift belt ore body.In the middle section of 18-20,the orebody was faulted by Fy2 fault NWW direction.?2?Intrusive diabase is developed in the mining area,and the deep borehole?zk1835-1?in the middle section of the 18th section is collected The U-Pb zircon isotopic study of the diabase at 127.25m shows that the zircon ages are mainly divided into two stages,35.3-114.7Ma and 1770.6-2373.5Ma,of which 35.3-114.7Ma is the intrusive age of the diabase and 1770.6-2373.5Ma is the zircon age of the strata clastic rock when the diabase intrudes,indicating that the intrusive age of the diabase is between 35.3-114.7Ma and the provenance year of the clastic zircon The age is1770.6-2373.5Ma,and the maximum sedimentary time of the clastic sedimentary rock is 1770Ma.?3?The ore-forming age of chalcopyrite-bornite in the hydrothermal vein of Luoxue formation is determined by Re-Os isotopic test technique.The ore-forming ages of chalcopyrite-bornite in the hydrothermal vein of Luoxue formation are at least three periods,which are?1755±220Ma,?1538±130Ma and 449.4?4.7Ma respectively,among which 1538±130Ma is the main ore-forming period,and the other two periods are 1755±220Ma and 449.4?4.7Ma,respectively Small scale metallogenic events.?4?Based on the comprehensive information research and the establishment of the prospecting prediction model,the distribution scope of the concealed No.1 and No.8 orebodies in the deep has been successfully predicted.Through the engineering verification,the new copper 332+333 copper metal resources amount is 42000 tons,providing guarantee for the subsequent production of the mining area,and the new mining period is 12 years based on the original mining period. |
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