The Characteristics And Genetic Analysis Of Kaladaban Pb-zn Deposit, East Of Altyn Taugh

The relationship between deposit and geological structure is one of the basic scientific research problems. The relationship of plate tectonic evolution stages, different tectonic units, and different genetic type of ore deposit becomes the latest development of international geoscince research. That constructions' controlling of the volcanic sedimentary deposit mainly reflects in the tectonic setting of ancient vocanic deposits, post-depositional structures'(hydrothermal) and destructive superimposition of mineralization, etc..Kaladaban area is in the central of Hongliugou-Lapeiquan Ordovician rift zone which lies in the southeast margin of Tarim block. It is clamped by NE Altyn Tagh strike-slip fault and EW Altyn northern margin fault. The geological prospecting in this area progresses greatly since mid-90s in this area.Kaladaban Pb-Zn deposit is the only large deposit in this area while with no geological research, so this paper chooses it as its target, to examine the relationship between structure and Pb-Zn deposit metallogenic which is of great significance on the identification of mineralization tectonic environment and the genesis of Pb-Zn deposit.This paper carries out detailed field investigation and observation, a selective indoor testing and analyzing based on previous work which leads to some new understandings of the following:1.After analysing of volcanic rock geochemistry combining with tectonic setting, this paper believes that the external mafic-intermediate volcanic rock is alkali magmatic rock with high potassium-iron alkaline properties. It is mainly mantle derived by crust contamination and oceanic plate subduction lead to the melting. Intermediate volcanic rocks in the area are of magmatic rock properties. It is in the side of the tectonic environment which is formed in an oceanic island arc subduction zone near the ancient continental crust.2.The paper described the geological features of Kaladaban Pb-Zn deposit. Its mineralized zone and the ore body extend along the layer, controlled by particular layer and lithology. The mineralization developed in the Upper Cambrian lithologic Zhuoabulake Group 4, which is mainly acid crystal tuff. The main useful components of ore are zinc, lead, copper and gold, while sphalerite is rich in gold. There mainly are microcrystalline, disseminated and massive structures.3.A preliminary analysis of the structure and Kaladaban Pb-Zn deposit has been got. The ancient island arc-tectonic setting controls ore-bearing volcanic strata's (and sedimentary ore body) formation and scope. The fold controls ore-containing volcanic rocks'(and sedimentary ore body) distribution. The metamorphism and deformation structure do little with mineralizations superimposes and reformation. The late NW brittle fracture cut the orebody with its dextral strike-slip.4.With the analysis of stable isotopes, rare earth elements and trace elements, by comparing the regional tectonic setting and typical volcanic-related Pb-Zn deposits, the initial genetic analysis is as follows:Kaladaban Pb-Zn deposit is of island arc volcanic massive sulphide-type, which belongs to volcanic massive sulfide (VMS) categories. Combining with periphery volcanic age and regional mineralization volcanic chronology contrast, this paper believe the deposit is formed in the mid-Early Paleozoic (about 500～510Ma or so) with geological analysis.