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[an error occurred while processing this directive]The Effect of Water/Rock Interaction for the Gold Fineness of Jiaojia Gold Deposit
Received date: 2018-08-16
Revised date: 2018-09-28
Online published: 2018-10-31
The gold fineness is a very important parameter for the gold deposit research and it is affected by many factors such as pH value and Na/(Na+K) of the ore-forming fluid.The water/rock interaction between ore-forming fluid and wall rock usually controls those important physico-chemical parameters.Jiaojia gold deposit is characterized by the intense water/rock interaction.No.Ⅰand No.Ⅲ orebodies in the Jiaojia gold deposit have different water/rock interaction due to different wall rocks.The study in this paper mainly focuses on the gold fineness comparison of the stage Ⅲ mineralization(quartz-polymetallic sulfide stage) between No.Ⅰand No.Ⅲ orebodies.The stage Ⅲ gold in two orebodies has been distinguished under the microscope.They were analyzed by the EPMA and the gold fineness was calculated according to analysis results.The mineral equilibrium phase image was calculated to estimate the variation tendency of pH value and Na/(Na+K) of the ore-forming fluid. Two points could been known according to this study:(1)The gold fineness in the stage III mineralization between No.Ⅰ and No.Ⅲ is similar;(2)pH value and Na/(Na+K) could be different when the ore-forming fluid was buffered by the pyrite-sericite-quartz alterated rock and K-feldsparation rock,but this difference has a little effect on the gold fineness.
Huanlong HU , Hongrui FAN . The Effect of Water/Rock Interaction for the Gold Fineness of Jiaojia Gold Deposit[J]. Gold Science and Technology, 2018 , 26(5) : 559 -569 . DOI: 10.11872/j.issn.1005-2518.2018.05.559
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