Geochemical characteristics and geological significance of the albitite in the Boka gold ore district, Yunnan Province

XIAO Xiaoniu; YU Xinming; XIAO E; XU Qiang; LIN Zhikui; LIN Yingjie

2017 Vol. 36, No. 8

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XIAO Xiaoniu, YU Xinming, XIAO E, XU Qiang, LIN Zhikui, LIN Yingjie. Geochemical characteristics and geological significance of the albitite in the Boka gold ore district, Yunnan Province[J]. Geological Bulletin of China, 2017, 36(8): 1417-1427.

Citation:

XIAO Xiaoniu, YU Xinming, XIAO E, XU Qiang, LIN Zhikui, LIN Yingjie. Geochemical characteristics and geological significance of the albitite in the Boka gold ore district, Yunnan Province[J]. Geological Bulletin of China, 2017, 36(8): 1417-1427.

Geochemical characteristics and geological significance of the albitite in the Boka gold ore district, Yunnan Province

1.
East China Mineral Exploration and Development Bureau for Nonferrous Metals, Nanjing 210007, Jiangsu, China
2.
Fujian Jindong Mining Co., Ltd., Sanming 365101, Fujian, China

Received Date: 14 February 2017

Revised Date: 24 April 2017

Publish Date: 25 August 2017

Abstract

Abstract

The Boka gold deposit is located in the Dongchuan ore concentration area, and belongs to Yunnan Proterozoic copper polymetallic mineralization belt. This paper reports the petrography, geochemistry and isotope features of albitite that is closely related to mineralization. Studies show that the mineral compositions of albitite are albite, pyroxene, biotite, and the major element characteris-tics indicate a high Na, alkali-enriched, metaluminous, alkaline-peralkaline rock. This albitite is characterized by low ΣREE, strong enrichment of LILE(K, Rb, Nd)and LREE(La, Ce, Sm), and depletion of HFSE elements(Nb, Ta, U, Th). Based on I_sr, ε_Nd(t)isoto-pic geochemistry, it is suggested that Boka albitite was produced by magmatism of Middle Proterzoic continent rift in Huili-Dongch-uan area, and it was derived from the deep mantle with the addition of some crustal materials in the magma source region.
- Boka albitite /
- petrography /
- geochemistry /
- enriched mantle /
- Yunnan Province

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References

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