Mineralization Geological Characteristics and Genesis of Ailin Gold Deposit in Jiaohe,Jilin Province
Received date: 2018-10-13
Revised date: 2019-04-15
Online published: 2019-07-09
Jiaohe area in Jilin Province is located in the southern section of the Lesser Xing’an Range-Zhangguangcai Rang Fe-Pb-Zn-Cu-Mo-W metallogenic belt.In this area,the stratum and structure is well developed,and the magmatic activity is frequent.It has a good metallogenic condition In 2016,the No.1 Gold Geological Party of Chinese Armed Police Force carried out the 1/50 000 regional geological survey in this area.A gold deposit was found near Ailin region by stream sediment survey and anomaly verification.Field mapping coupled with laboratory research was conducted to investigate the mineralization geological characteristics and genesis of Ailin gold deposit in Jiaohe,Jilin Province.Field mapping suggests that the orebody is restricted by the NW faults and the wall rocks are mainly consisting of silty rock,belongs to Fanjiatun Group.The study of fluid inclusions shows that the homogeneous temperature of fluids is 240~400 ℃,the salinity is 7.5%~10.5%,the density is 0.75~0.90 g/cm3. The metallogenic pressure is 6.40~15.75 MPa.And the metallogenic depth is 0.64~1.60 km.It has the characteristic of epithermal mineralization and medium-high metallogenic temperature mineralization.H-O isotope analysis results show that δ18O values of fluids from fluid inclusions in quartz vary from 5.40‰ to 6.86‰,δD values of quartz from the ore change from -103.1‰ to -100.0‰,indicates that the water was derived mainly from mixed meteoric and magmatic water.Integrating the geological features of the region,orebody characters and analysis results,this paper comes to the conclusion that this deposit is of the medium-high temperature,closely related to the invasion of granite and the metallogenic age of the Ailin gold deposit is early Yanshannian,it was formed in the transition from the collision closure of Petro-Asian Ocean to the subduction of Pacific Plate.
Cunzhu WANG , Guihu CHEN , Qingquan LI , Wenbao WANG , Jingwen CHEN , Xuewen CUI . Mineralization Geological Characteristics and Genesis of Ailin Gold Deposit in Jiaohe,Jilin Province[J]. Gold Science and Technology, 2019 , 27(3) : 328 -338 . DOI: 10.11872/j.issn.1005-2518.2019.03.328
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