富磷矿三阶段动态成矿模式:黔中开阳式高品位磷矿成矿机制<sup>*</sup>

doi:10.7605/gdlxb.2019.02.020

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Abstract The Kaiyang and Weng'an phosphate-rich depositional district that developed in central Guizhou Province during the depositional period of Sinian Doushantuo Formation has high ore yield and P₂O₅ grade and is the phosphorite one of the most important phosphate resources region in the world. The phosphorites deposits of central Guizhou Province developed along the shallow-water margin of Qianzhong Oldland. These phosphatic beds are predominantly composed of reworked clastic phosphorites interbedded by pristine phosphatic marls,biogenetic phosphorite and diagenetic unconsolidated phosphorite. The dynamic sedimentary and mineralization process of the Kaiyang-type high-grade phosphorite could be called three stages mineralization process. The first stage is the pristine phosphogenesis: Upwelling of the bottom waters might have brought P-enriched waters to the shallow photic zone,stimulating the supersaturation of phosphate in seawater through the bio-chemical dynamism and then the precipitation of francolite. The second stage is the winnowing and reworked process: The syndepositional wave- and storm-induced erosion,winnowing and reworking continuously restructured pristine phosphatic facies and removed the lighter terrigenous grains,forming assemblages of economic granular phosphorites. The last stage is the exposing and leaching process: The exposure event caused by the sea-level fall led to weathering and leaching of phosphatic successions,the slightly acidic meteoric water dissolved carbonate minerals and created carbonate-rich solutions which travelled through subsurface drainage,resulting in secondary enrichment of phosphate. The three stages mineralization process regulated by the palaeogeography and frequent sea-level changes dynamically and repeatedly worked on the phosphate deposits,finally forming the high-grade and economically significant phosphate ores.

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	Articles by authors
	Zhang Ya-Guan
	Du Yuan-Sheng
	Chen Guo-Yong
	Liu Jian-Zhong
	Chen Qing-Gang
	Zhao Zheng
	Wang Ze-Peng
	Deng Chao

Key words： central Guizhou Province Sinian Doushantuo Formation Kaiyang-type phosphorite three stages mineralization

Received: 02 November 2018

ZTFLH:

P691.21+3

Fund:Co-funded by the Bureau of Geology and Mineral Exploration and Development of Guizhou Province(No.[2013]56)and the National Natural Science Foundation of China-The People's Government of Guizhou Province Karst Scientific Research Center

Corresponding Authors: Du Yuan-Sheng,born in 1958,is a professor and Ph.D. supervisor of China University of Geosciences(Wuhan). He is mainly engaged in the research on sedimentary geology. E-mail: duyuansheng126@126.com.

About author: Zhang Ya-Guan,born in 1990,is a Ph.D. candidate of China University of Geosciences(Wuhan), and his major is sedimentary geology. E-mail: zyg1000800@sina.cn.

Cite this article:

Zhang Ya-Guan,Du Yuan-Sheng,Chen Guo-Yong et al. Three stages dynamic mineralization model of the phosphate-rich deposits: Mineralization mechanism of the Kaiyang-type high-grade phosphorite in central Guizhou Province[J]. JOPC, 2019, 21(2): 351-368.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2019.02.020 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2019/V21/I2/351

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