贵州开阳以东震旦系陡山沱组磷矿富磷机制与“三位一体”预测找矿重大突破<sup>*</sup>

doi:10.7605/gdlxb.2020.05.062

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Abstract Package exploration area in the eastern Kaiyang region is located at the southeastern margin of the Yangtze block,which is the concentrated distribution area of high-grade phosphorite deposits in China. The comprehensive studies of sedimentology,petrology,stratigraphy and palaeogeography in Doushantuo phosphorite ore-bed of the Kaiyang region show that the phosphorite deposits were controlled by the open shallow coastal sedimentary environment formed by denudation and deplanation of the Central Guizhou Oldland. Phosphorite lithofacies associations,mineralogical features and sedimentary structures indicate that the phosphorites had experienced “three stages of mineralization process”in the Kaiyang region: The first pristine bio-chemical phosphogenesis stage,the second winnowing and reworking stage and the last exposure and leaching stage. The winnowing and reworking processes are the key mechanism to the formation of the thick and high-grade phosphorite. According to the “Triunity Model”metallogenic theory,the research team confirmed the bedded distribution along the open phosphatic shore in the north of the Qianzhong Oldland,constructed the metallogenic model and ore prospecting model,and determined that the shoreface is the major target area of high-grade phosphorite ore. The research team have achieved the innovation of phosphorite metallogenic theory and broke through the bottleneck of phosphorite deposits exploration by cooperating of industry-university-research,and the metallogenic range was expand from 250^km² to 1000^km² and quantity of predicted resources increased from 94.42^megatons to 1.3 giga-tons. The prospection verification in the part of areas estimated the ore resources of phosphorite deposits(Inferred and predicted resources) of 548.92 megatons,especially the newly added high-grade phosphorites 357 megatons,achieving significant breakthrough of ore prediction of high-grade phosphorites in China.

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	Articles by authors
	Liu Jian-Zhong
	Wang Ze-Peng
	Du Yuan-Sheng
	Zhang Ya-Guan
	Wu Wen-Ming
	Chen Guo-Yong
	Fu Zhi-Kang
	Wan Da-Xue
	Wang Da-Fu
	Tan Dai-Wei

Key words： phosphorite deposits package exploration potential prediction Kaiyang in Guizhou Province

Received: 30 June 2020

ZTFLH:

P588.24+4

Fund:Co-funded by United Foundation of the National Natural Science Foundation of China(No.U1812405),the second batch of Integrated Exploration Projects of Guizhou Province and the third batch of the National Integrated Exploration Projects of China Geological Survey(Nos.12120114016501,0747-1661SITCN131)and the Geological Scientific Research Projects of Guizhou Geology and Mineral Exploration and Development Bureau(Guizhou Geology and Mineral Exploration Development:[2016]No.10,[2016]No.11)

About author: Liu Jian-Zhong,born in 1966,researcher,is a project leader of phosphorus mineral exploration project in the east of Kaiyang,Guizhou. He is mainly engaged in mineral exploration and geological study of mineral deposits. E-mail: Liujianzhong868@sina.com,2585364825@qq.com.

Cite this article:

Liu Jian-Zhong,Wang Ze-Peng,Du Yuan-Sheng et al. Enrichment mechanism of phosphorite deposits and significant breakthrough in “Triunity Model”for ore prospecting in the Sinian Doushantuo Formation of eastern Kaiyang region,Guizhou Province[J]. JOPC, 2020, 22(5): 913-928.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2020.05.062 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2020/V22/I5/913

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