Study And Prognosis On Geological-Geochemical Dynamics Of Mineralization In Kanggultag Gold-Copper Ore Belt, East Tianshan

The Kanggultage gold—copper ore belt is located in the northern Late Paleozoic Aqishan — Yamansu island arc belt in the northeast of Tarim plate. Most of gold (copper) deposits were formed in collide — ductile shear processes, which was between Tarim plate and Junggar palte during Late Hercynian. The gold ore deposits were controlled by reginoal left-shear process. The study of geological geochemistry of the gold deposits has shown; (1)three — type gold deposit was situated in the ore belt, including altered rock type in shear zone, epithermal type and magma hydrothermal type; (2)the ore—forming materials and fluid for altered rock type deposit shows multiple source; (3)the ore materials of epitermal and magma hydrothermal type deposit is from respectively hosting volcanic rocks and magma rock, ore forming fluid of them is from respectively meteoric water and magma water.The author has studied majorly geological—geochemical dynamics of mineralization to Kanggultage gold —copper ore belt. The study of tectonic dynamics shows that ore—forming structure differential stress values of Xitan gold deposit is 72. 8× 10~6~76. 6×10~6Pa,and that of Kanggul gold deposit is 101. 3×10~6~133. 2×10~6Pa. The host structure of Xitan deposit shows variation of brittle fracturing and brittle spreading.The host structure of Kanggul deposit shows evolution from brittle — ductile shear deformation to brittle shear fracturing. Dynamics of hydrothermal ore —forming fluid has also studied in this paper. Author applies Bernoulli equation to dynamic model of hydrothermal fluid motion in rock brittle fracture and cracks (quartz vein type gold mineralization) , and applies Darcy law to dynamic model of hydrothermal fluid motion in porous medium (altered rock type gold mineralization). Auther does daring try in order to study quantitativly transport mechanism of hydrothermal ore— forming fluid in this paper. The study of hydrothermal ore — forming system and crystal dynamics shows that hydrothermal ore — forming reaction system includes three types, as follows: ore —forming reaction,reaction and buffer controlling reac-tion. There are relationship of depending on each other, controlling each other a-mong the them, which form a organic system. The crystal—dynamic information of SiO2 suppersaturability and crystal — rate of hydrothermal solution can be estimated with help of measure of quartz crystallinity index (CD and study of ore texture and structure. Eurther research has shown that formation of oreshoots was controlled by coincidence processes of change of tectonic dynamic condition and thermodynamic evolution.This paper has summaried reginoal metallogenic laws and seted up metallogenic (dynamics) models for Kanggultage gold—copple ore belt. The auther has suggested ideas of metallogenic prognosis for furture work.