Discussion On Ore Characters And Process Of The Gold Mine In Feature Correlation Of Dadu River Basin In Different Mine

Gold positions in the Dadu river basin gold belt scattered all over like stars in the sky or men on a chessboard,which belong to the type gold deposits that originate in crystalline basement unconformity surface or sedimentary cover.The model gold deposits of this article is Huangjinping gold deposits which originates in crystalline basement in Dadu river and Pianyanzi gold deposits which originates in unconformity surface,and Erligou gold deposits which originates in sedimentary cover.The study of ore forming process starts from the mineragraphy point of view,basing on detailed research of geological characteristic and ore characteristic of the three gold deposits,to createa Dadu river areal simple gold ore-forming model.The Huangjinping sea level at 2500 m below place in Dadu river both sides.Pian yanzi deposits and Erligou deposits are located above sea level 2500 m.Because they locate in the trigeminal rift that formed by Xian Shui river/ Long Men hill and Panxi rift,where at the north section of Xikang Yunnan axis NE structural belt,generally,their rock has been through regional metamorphism.Most ore structure of the gold deposits are vesicular/ cellular or other secondary structure that has been experienced oxide and destruct.The ore-forming temperature in crystalline basement is a little high,and the principal components of the ore are sulfides and telluride,unconformity surface and sedimentary cover ore forming temperature is lower,and the principal components of the ore are sulfides and sulfate minerals.From basement to surface to cover,their ore components from sulfides and telluride turn to sulfate minerals to sulfides,as always,pyrite is the very important gold-bearing mineral.With altitude increase,pyrite turn sulfur loss to iron loss,and ratio of Co/Ni is to gradually decrease,and the lattice parameter gradually increase.Shear zone played an important role in controlling the Dadu River gold mine,migration of hydrothermal fluid and precipitation are closely related to shear zone.The temperature and pressure rise has caused the activation and aggregation of various kinds of water in rocks.These water include fissure water,grain water,crystal water,structural water,etc.The water act as a solution filter that filtered the rock of ore-forming materials.Thereupon then produce migmatic hydrothermal gold rich elements,which leads to the migration and enrichment of gold elements.The kinetic energy and heat energy produced by the strong orogenic movement of Himalaya Range period has driven dynamic metamorphic hydrothermal fluid,deep magmatic hydrothermal fluid,along a variety of rock pore flow formation cycle system,so that the ore source rocks in the re activation of ore-forming materials,migration and formation of ore-forming solution then enrichment and mineralization in favorable tectonic sites.