黔东铜仁地区寒武系热液白云岩特征及其成矿意义<sup>*</sup>

doi:10.7605/gdlxb.2018.05.061

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Abstract

Multiple outcrops of the hydrothermal dolostone are distributed throughout the Cambrain Qingxudong and Loushanguan Formations in Tongren area,eastern Guizhou Province. The dolostones are generally massive,lenticular and brecciated. Based on investigations in the outcrops and rock slabs,measurement of temperature of fluid inclusions,and REE and Sr isotope analyses,we studied the genesis and fluid property of different types of hydrothermal dolostone and their relationship with the mineralization of Pb-Zn deposits. The results indicate: (1)Hydrothermal dolostone is composed of medium-coarse-crystalline to ultra-coarse-crystalline saddle dolomite crystals. The formation temperature varies from 96 to 223 ℃,with an average of 155.86 ℃. Salinities is between 8.28 and 16.15 wt% NaCl,with an average of 12.30wt% NaCl. Characterized by REE enrichment and a negative Ce anomaly with the LREE to HREE ratio of 16.51,δCe value of 0.79,and ⁸⁷Sr/⁸⁶Sr ratio of 0.708662. (2)Massive and lenticular hydrothermal dolostone formed by more complete metasomatism of dolomitized fluid,whereas brecciated hydrothermal dolostone formed by hydrofracturing. Dolomitized fluid may come from the underlying Sinian carbonate strata,with faults and fractures as fluid migration channels. (3)Dolomitized fluid and regional Pb-Zn ore-forming fluid have similar temperature,salinity and geochemical characteristics,and share similar origins. A few metallogenic materials of the hydrothermal dolostone were also formed around the main Pb-Zn metallogenic stage.

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	Articles by authors
	Li Chi
	Pan Wen
	Du Yuan-Sheng

Key words： Guizhou Province hydrothermal dolomite hydraulic fracturing lead-zinc mine

Received: 10 June 2018

ZTFLH:

P588.24+5

Fund:

Scientific Project of Bureau of Geology and Mineral Exploration and Development of Guizhou Province(No.[2016]05)

Corresponding Authors: Pan Wen,born in 1970,is a Ph.D. candidate of China University of Geosciences(Wuhan) and a senior engineer. He is mainly engaged in sedimentary geology and minerals. E-mail: 345704348@qq.com.

About author: Li Chi,born in 1995,is a master candidate of China University of Geosciences(Wuhan),and his major is sedimentology. E-mail: 1307842992@qq.com.

Cite this article:

Li Chi,Pan Wen,Du Yuan-Sheng. Characteristics and metallogenic significance of the Cambrain hydrothermal dolostone in Tongren area, eastern Guizhou Province[J]. JOPC, 2018, 20(5): 869-876.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.061 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/869

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