神农架林区火炼坡矿区成磷时代的新认识及意义  

New Cognition and Significance of Phosphorus-forming Age of Huolianpo district, Shennongjia forest region

作　　者：陈冲[1] 陈开旭[1] CHEN Chong;CHEN Kai-Xu(Wuhan Center of China Geological Survey, Wuhan 430205, Hubei, China)

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430205

出　　处：《华南地质与矿产》2016年第4期366-373,共8页Geology and Mineral Resources of South China

摘　　要：鄂西地区作为扬子地台四大聚磷区之一,通过大量研究与勘查工作,鄂西地区磷矿为陡山沱期沉积型磷块岩矿床,并在实际工作得到验证,然而对于鄂西地区非陡山沱期磷矿鲜有报道。文章通过对鄂西地区神农架火炼坡矿区磷矿野外详细调查基础上,结合探槽、钻孔勘查工程取样分析测试及矿石薄片镜下鉴定结果,确定火炼坡磷矿为神农架群乱石沟组沉积变质型磷灰石矿床。研究认为,火炼坡磷矿床形成于浅海碳酸盐潮坪亚相带向潮下低能相带过渡的半局限台地氧化环境,之后遭受后期区域变质及构造变形作用,重结晶成以针柱状磷灰石为主的磷矿床;区域上神农架群乱石沟组磷矿发现为鄂西磷矿区增加新的找磷层位和磷矿类型,且温水河-松柏-阳日一带乱石沟组地层具有重要的找矿潜力。The western Hubei province is one of four big phosphorus accumulation areas in Yantze platform. The phosphorite deposit of western Hubei province belongs to sedimentary phosphorite deposit during Doushantuo period,which is verified in the actual work, but the phosphate deposit in western Hubei province during non-Doushantuoan period is rarely reported. Based on detailed field survey in Shennongjia Huolianpo district of western Hubei province, combining with sample analysis from trench and drilling exploration engineering and oreslice identification results, we determine Huolianpo phosphorite deposit as sedimentary-metamorphic apatite depositin Luanshigou Formation,Shennongjia Group. Research suggests that Huolianpo phosphorite deposit is formed in semi restricted platform oxidation environment, changing from shallow carbonate tide flat subfacies to subtidal low-energy facies, following regional metamorphismand tectonic deformation, finally form apatite deposit with abundant recrystallization acicular apatite; The discovery of Luanshigou Formation phosphorite deposit indicates existence of new phosphorus-bearing stratum and new phosphate type in the western Hubei province, and Luanshigou Formation in the Wenshuihe-Songbai-Yangri area owes considerable prospecting potential.

关 键 词：鄂西 神农架林区 火炼坡矿区 沉积变质型磷矿 

分 类 号：P619.213[天文地球—矿床学]