Discussion on the Genesis of Boka Gold Deposit in Dongchuan，Yunnan Province
Received date: 2016-06-28
Revised date: 2016-07-14
Online published: 2017-01-22
Boka gold deposit is hosted in a set of low-grade metamorphic pyroclastic sedimentary rocks and detrital carbonatite in the Paleoproterozoic-Mesoproterozoic.The δ34S(V-CDT) of gold-bearing pyrite has a change range from 3.71‰～7.93‰，which suggests that the sulfur comes from magma and stratums have been blend very well in the hydrothermal metallogenic system.The histogram of fluid inclusion homogenization temperature that ranges between 130～260 ℃ is evidently bimodal，which shows an character of evolutionary stages from medium to low temperature hydrothermal deposit.The salinity of those fluid inclusions tends to concentrated in a smaller range of 13.5%～17.6%，this shows that the hydrothermal ore-forming solution is medium-high sa linity fluids.The gas phase compositions of fluid inclusions is primary H2O with a few of CO2，CH4 and H2.The complex anion group and negative ions in liquid phase compositions is mainly F-，Cl- and SO42-，and the mainly positive ion contains Na+，K+，Ca2+ and Mg2+.It seems that there is a dynamometamorphic metallogenic stage after the hydrothermal mineralization period whose metallogenetic epoch is mainly Indo-China period to early Yanshan epoch.The gold deposit is the product of mixed hydrothermal mineralization which is concerned with sodic diorite magmatism during Indo-China period to early Yanshan epoch in the lithosphere expansion dynamic background.After that，the deposit has experienced the dynamic metamorphism of brittle-ductile shear in Himalayan period and finally developed a polygenetic compound ore deposit.
HUANG Chaowen , ZHANG Shugen , LIU Chunbo , MO Jinglong , LI Kailin . Discussion on the Genesis of Boka Gold Deposit in Dongchuan，Yunnan Province[J]. Gold Science and Technology, 2016 , 24(6) : 49 -56 . DOI: 10.11872/j.issn.1005-2518.2016.06.049
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