黔西北玉龙地区REE矿化主控因素与找矿方向  

Main controlling factors of the REE mineralization and prospecting direction of the REE resources in the Yulong area of the northwestern Guizhou

作　　者：薛洪富 黄威虎 曾道国 金中国 黄智龙[3] 吴林 向震中 叶霖[3] XUE Hong-fu;HUANG Wei-hu;ZENG Dao-guo;JIN Zhong-guo;HUANG Zhi-long;WU Lin;XIANG Zhen-zhong;YE Lin(Institute of Geology and Mineral Exploration,Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,China;Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,China;Stake Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]贵州省有色金属和核工业地质勘查局地质矿产勘查院,贵州贵阳550005 [2]贵州省有色金属和核工业地质勘查局,贵州贵阳550005 [3]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550081

出　　处：《矿物学报》2023年第6期799-809,共11页Acta Mineralogica Sinica

基　　金：贵州省地勘基金项目“贵州省威宁县玉龙地区铌、稀土矿精查”(编号:2021-01号);贵州省找矿突破战略行动重大协调创新项目“贵州稀土、钡、氟等特色资源成矿规律与找矿预测研究”(编号:[2022]ZD004)。

摘　　要：黔西北玉龙地区稀土含矿层(Pxt)产于宣威组(P_(3)x)底部,假整合于峨眉山玄武岩组(P_(2-3)em)之上,由铝质段和铁质段组成,厚度受基底不整合面低洼起伏形态制约,介于3.25~18.76 m之间。稀土矿层可划分为7层,以Ⅱ和Ⅳ矿层为主矿层,具分布连续、厚度大、品位高等特点。铝质段存在是高品位稀土产出的直接影响因素,稀土矿化富集对岩性具选择性,铝质黏土岩、含碳质铝质泥岩、致密状铝质泥岩、含碎屑/豆鲕铝质泥岩是稀土富集优势岩相。w(Nb2O5) 130×10^(-6)~550×10^(-6)、w(ZrO2) 0.06%~0.38%、w(TFe) 7.94%~24.72%及A/S比值0.82~3.60区间,为REO品位≥0.18%集中分布区。虎家营向斜东翼中部以南、西翼中部以北地段铝质段分布连续、厚度大,为下一步稀土找矿重点地段,尤其是向斜东翼南部铝质段厚度大、优势岩相组合齐全,应为下步勘查首选区。The rare earth elements(REE)ore-bearing layer(Pxt)in the Yulong area of in the Northwest Guizhou is distributed at the bottom of Xuanwei Formation(P_(3)x),and overlaid disconformably above the Emeishan basalt Formation(P_(2-3)em).It is composed of aluminous and ferruginous claystones,with its thicknesses ranging from 3.25m to 18.76 m under restriction of the low-lying undulation on the unconformity surface of the basement.The REE ore-bearing layer can be subdivided to 7 seams,with theⅡandⅣseams as the main ore seams,which are characterized with continuous distribution,large thickness and high grade.The existence of aluminous segment is a direct factor affecting the production of the high-grade REE ore,The REE mineralization and enrichment are selective to lithology.Aluminous claystone,carbonaceous aluminous mudstone,compact aluminous mudstone and clastic/oolitic aluminous mudstone are of dominant lithofacies for the REE enrichment.These REE-enriched samples have Nb2O5 contents of 130×10^(-6)-550×10^(-6),ZrO2contents of 0.06%-0.38%,and TFe contents of 7.94%-24.72%,with A/S ratios of 0.82-3.60.The aluminous segment is the concentrated distribution area with REO grades of≥0.18%for its various samples.The aluminous segments in the south side of the central part of the east limb and the north side of the central part of the west limb of the Hujiaying syncline are continuously distributed with large thickness.They are key targeting segments for the further REE ore-prospecting in the area.Especially,the southern part of the east limb of the Hujiaying syncline should be firstly choosed for the further REE exploration target as there is very thick aluminous segment containing complete combination of advantageous rock facies.

关 键 词：REE矿化 控矿因素 找矿方向 黔西北 

分 类 号：P588.22[天文地球—岩石学] P594[天文地球—地质学]