云南东川播卡金矿床成因探讨

doi:10.11872/j.issn.1005-2518.2016.06.049

Abstract

Abstract:

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.

Key words: genesis of mineral deposit, fluid inclusion, Boka Gold deposit, Dongchuan area, Yunnan Province

CLC Number:

P618.51

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.

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Discussion on the Genesis of Boka Gold Deposit in Dongchuan，Yunnan Province

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