Study On The Denudation Extent Of Dabu Dranium Deposit

Dabu uranium deposit is one of the large uranium deposits in China,and its tectonic position is situated in the Southern China fold system in the fold belt.The deposit is located in the middle of Taoshan double intrusive bodies,mainly distributed in the transition belt of the grain two-mica granite and biotite granite.Dabu uranium deposits is a large uranium deposits in the north of Taoshan Ore fields,whose ore body is a group of veins,fish-like distribution but no main body.With the fracture density concentrated,the mineralization intensity,the thickness of the ore body and the grade are increased.The mineralization are controlled by fault on the erosion of F7 fracture rock belt.The ore body is mainly blind ore body,with small one on the surface.In this paper,through the observation of wall rock alteration,microscopically mineral distribution characteristics,study on fluid inclusions and apatite fission track,we conclude that the metallogenic environment and ore rock uplift degree.On metallogenic stage inclusions research it is that homogenization temperature of Da Bu of ore-forming fluid is mainly distributed between 160??340?,fluid salinity 0.18wt%-9.36wt%,fluid density 0.4-1.15g/cm~3 and metallogenic pressure 0.8?2335×10~5Pa,The ground pressure gradient is 75~*10~5/km Pa,and the static pressure value is 75~*10~5 Pa/km,that show metallogenic depth 2.89?9.34km,average 6.11km.The deposit is a medium-low temperature hydrothermal deposit.Single mineral apatite fission track age range between 55?66Ma and rock age rocks between 150Ma,metallogenic age between 60?70Ma,That implied Obviously apatite fission track record of the movement of rock after the mineralization.Apatite fission track length distribution shows the samples by partial annealing zone,through the long period of time,and length of the samples are mostly unimodal,which is temperature of the late effects,The deposit has been in cooling process after mineralization.The cooling process is believed to be due to uplifting.By using the software AFTSolve,apatite fission track ages and track length of thermal history simulation can be analyzed.By the geothermal gradient of 35?/km,The sealing temperature of the apatite is 120 degrees Celsius,and the sea level change in the current sea level is assumed to change slightly.for calculation of the uplift rate after mineralization,the uplift rate of the ore body is about 0.0457mm/a?0.1047mm/a.The ore body is about to rise by 2.99km.The erosion amount was 2.87km.Less than the average depth of the deposit formation 6.11km.Therefore,it's considered that the ore prospecting in the deep part of the deposit is very considerable.