Denudation and Conservation History of Local District in Jiapigou Gold Deposit,Huadian County,Jilin Province——Evidence from Apitite Fission Track Thermochronology

The denudation history of the Jiapigou gold deposit is still unknown nowadays.Even though a large number of researches have been done in Jiapigou,the calculation of denudation in this area is relatively virgin territory.However,it is denudation that is able to significantly unveil the preservation of deposit.Fission track is able to provide the accurate thickness of denudation and uplift efficiently.This article discusses the denudation history of local district in the Jiapigou gold deposit by means of apitite fission track(AFT) technique.The thermal history has been derived from the data of AFT.8 AFT ages have been obtained,and are divided into 3 groups of128 ~ 111 Ma and 86 ~64Ma,as well as 48 ~29Ma.Meanwhile,three phases,such as 160 ~(85 ± 10)Ma,(85±10) ~(28 ±2) Ma and(28 ±2) ~0Ma,can be received by analyzing thermal history of 6 samples.The main thickness of the section removed by denudation of each phase are 2.90 km,0,and 1.17 km respectively,which predict that the gold deposit is still lying under earth's surface by comparing with the depth of mineralization.