古地理学报2025，Vol.27Issue(5)：1081-1103,23.DOI:10.7605/gdlxb.2025.091
基于"磷酸盐工厂"的磷矿沉积学研究:以黔中地区埃迪卡拉系陡山沱组磷矿为例
Sedimentological study of phosphorite deposits based on"Phosphate Factory"model:a case study of the Ediacaran Doushantuo Formation phosphorites in central Guizhou Province,China
摘要
Abstract
The Ediacaran(Sinian)Doushantuo Formation in the central Guizhou Province repre-sents a significant phosphorite metallogenic province hosting high-grade phosphate deposits in China.To e-lucidate the metallogenic geological conditions,deposit characteristics,and mineralization processes of the Doushantuo Formation phosphorites in the central Guizhou region,based on the principles of ore sedim-entology and"Phosphate Factory"model,this study systematically investigates the phosphorite-bearing series through an integrated analysis of petrology,sedimentary facies and palaeogeography.Our research indicates that the primary phosphorites of the Doushantuo Formation in central Guizhou are dominated by intraclastic phosphorites(including sandy,gravelly,and silty intraclasts),with minor amounts of oolitic,peloidal,bioclastic,and stromatolitic phosphorites.The phosphorite ores are primarily character-ized by phosphatic cement overgrowths and dolomitic cements in the pore,with subordinate clay matrix in-fillings.Secondary phosphorites include earthy to semi-earthy varieties,as well as brecciated and silicified phosphorites.Palaeogeographic studies reveal that the phosphorites mainly formed in an open beach envi-ronment along the northern and eastern margins of the central Guizhou Oldland,with localized develop-ment of stromatolitic phosphorites in tidal flat settings.The phosphorite horizons(Phosphorite-A and Phos-phorite-B)are controlled by two transgressive-regressive cycles.The high-grade phosphorites in the Edia-caran(Sinian)Doushantuo Formation of central Guizhou underwent a three-stage mineralization process:initial phosphate precipitation,wave-winnowing concentration,and secondary leaching enrichment.Based on this framework,we propose an open-shoreline mineralization model for the Doushantuo phosphorites.关键词
磷矿/磷酸盐工厂/矿产沉积学/埃迪卡拉(震旦)纪/贵州省Key words
phosphorite/phosphate factory/ore sedimentology/Ediacaran(Sinian)/Guizhou Province分类
天文与地球科学引用本文复制引用
杜远生,郭华,张亚冠,刘建中,王泽鹏,吴文明,陈国勇,赵征,邓超..基于"磷酸盐工厂"的磷矿沉积学研究:以黔中地区埃迪卡拉系陡山沱组磷矿为例[J].古地理学报,2025,27(5):1081-1103,23.基金项目
部省合作试点项目(编号:2023ZRBSHZ060)和贵州省毕节地区磷矿调查评价项目联合资助.[Co-funded by Ministry of Natural Re-sources-Guizhou Province Pilot Cooperation Project(No.2023ZRBSHZ060)and Phosphate Ore Survey and Evaluation Project in Bijie Region,Guizhou Province] （编号:2023ZRBSHZ060）
