Copper Polymetallic Deposit Genesis Discussed In Tiesha Street Yiyang

Tiesha Street copper polymetallic deposit located in Pingxiang- guangfeng deep fault the south, adjacent parts of tectonics east-west and north-east,as part of the North Wuyi mineralization belt. The ore rock is rock group of Tiesha Street in Middle Proterozoic, a series of marine spilite-keratophyre. In this paper, Tiesha Street copper as the research object, By systematically taking core samples to study their petrology, geochemistry, isotopic dating characters, to identify the rock types, the relationship between wall rock alteration and mineralization,petrogenesis,diagenetic age,and the tectonic setting.Deposit occurs more often superimposed alteration, alteration and mineralization closely related in time and space, in which a suicide, actinolite, carbonation, chlorite and mineralization is most closely related. Mineralization can be divided int o three metallogenic period of five stages, namely ①submarine volcanic eruptions and diagenetic mineralization period ② metamorphism- superimposed mineralization(quartz- oxide and sulfide stage and carbonate stage) ③ table creation of ore.Most of the surrounding rock, according to alkaline volcanic rocks. The points in the TAS diagram more dispersed. Acidic volcanic rock and basic volcanic rocks reflected in the different stages of the product of volcanic eruption. Other scattered points may be made due to the late hydrothermal alteration.Sulfur isotopic composition of deposit has the characteristics of deep source, Oxygen isotopic composition of the water reflects the ore- forming fluid is mainly magmatic water mixed Pb isotopic compositions indicate that lead ores mainly from undersea volcanic- sedimentary formations.Spilite SHRIMP zircon age of 1153.4 ± 38.4 Ma; sericite phyllite SHRIMP age of 902 ± 23 Ma, C losely associated with mineralization of potash feldspar Ar- Ar isotope dating was 138.22±0.64 Ma. Indicates that the source bed of the original ancient eruption Mesoproterozoic late, large-scale regional metamorphism occurred in the early Neoproterozoic, and there is at least once a deposit mineralization in Yanshanian.Late Proterozoic, Presinian craton occurred rifting, submarine volcanic activity, ore-forming materials precipitation in the basin. Late Caledonian metamorphism of the region, so that the original metamorphic hydrothermal mineralization and renovated; Indosinian crust strong compression of the ore body has the dual role of certain destruction and re-enrichment; Yanshanian magmatic activity, make the mineralization enrichment of ore-forming elements further activation mineralization in the layer.The rocks group of Tiesha Street formed in the post-orogenic phase plate Mesoproterozoic environment, maybe formed by the upwelling mantle material from Cathaysia plates caused by the rift thinning cracking stage. Yanshan metallogenic period for oceanic crust subduction orogenic belt of the tectonic environment.