Geological characteristics and resource potential of the super-large high-quality phosphorite deposit of the Yangchang in Zhenxiong County, Yunnan Province, southwestern margin of the Upper Yangtze Block
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摘要:
滇东北镇雄县羊场磷矿为近年来新发现的超大型优质磷矿床，矿床储量大(预测远景资源量达130×108 t)、矿体厚度大(30余米)，且矿石质量优(为低镁高钙石灰岩型磷矿石)。矿床位于上扬子陆块西南缘前部碳酸盐台地威宁-昭通褶-冲带中硝滩-羊场聚磷盆地半封闭的浅水台地相中，为典型的早寒武世浅海相沉积型磷矿床。古构造、岩相古地理及成磷条件研究表明，硝滩-羊场聚磷盆地西部的绥江-永善-昭通成磷区，已发现永善县务基、金沙厂、官房等中型磷矿床。盆地东部的羊场磷矿所属的镇雄-威信成磷区与其具有相似的成矿背景，成矿地质条件好，找矿潜力巨大。通过对羊场磷矿成矿地质背景、古构造、岩相古地理等综合分析，总结区域磷矿成矿规律和找矿方向，为上扬子地块西南缘早寒武世海相沉积型磷矿床找矿突破提供依据。
Abstract:The Yangchang phosphorite deposit in Zhenxiong County, northeastern Yunnan Province is a newly discovered super-large high-quality phosphorite deposit with large reserves (predicted prospective resources of 13 billion tons), large ore body thickness (up to 30 meters) and excellent ore quality (low-magnesium high-calcium limestone-type phosphate rock).The phosporite deposit is located in the semi-closed shallow-water platform facies of the carbonate platform Weining-Zhaotong fold-punch belt Xiaotan-Yangchang polyphosphorite basin in front of the southwestern margin of the Upper Yangtze Continental Block, which belongs to typical Early Cambrian marine sedimentary phosphorite deposit.The study of paleostructure, lithofacies palaeogeography and phosphorite-forming conditions indicates that Suijiang-Yongshan-Zhaotong phosphorite-forming area in the west of the Xiaotan-Yangchang polyphosphorite basin have found medium-sized phosphorite deposits such as Wuji, Jinshachang and Guanfang in Yongshan County.Located in the Zhenxiong-Weixin phosphorite-forming area, east of the basin.The Yangchang phosphorite deposit has a similar metallogenic background, with good metallogenic geological conditions and great prospecting potential.Based on the comprehensive analysis of the geological background, paleostructure and lithofacies paleogeography of the Yangchang phosphorite deposit, the regional phosphorite mineralization law and prospecting direction are summarized, which provides the basis for prospecting breakthrough of the Early Cambrian marine sedimentary phosphorite deposits at the southwestern margin of the Upper Yangtze Block.
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