中国地质调查2023，Vol.10Issue(6)：39-49,11.DOI:10.19388/j.zgdzdc.2023.06.05
川南兴文地区上二叠统龙潭组下部稀土元素富集特征
REE enrichment characteristics in the lower part of Upper Permian Longtan Formation in Xingwen area of Southern Sichuan Province
摘要
Abstract
Upper Permian Longtan Formation clay rocks,which are related to the weathering of Permian Emei ba-salt,are widely distributed in the middle zone and outer zone of Emei Large Igneous Province of Southern Si-chuan,and they have geological background and metallogenic conditions for the formation of rare earth and other critical metal mineral resources.A systematic geological survey has been carried out in the lower part of Upper Permian kaolinitic clayston Longtan Formation in Changning anticline,and REE content in clay rocks was ana-lyzed.The results show that the types of clay rocks(ore)include kaolinite clay rocks,pyrite bearing kaolinite clay rocks and carbonaceous kaolinite clay rocks.The content of ω(TRE2O3)in clay rock samples ranges from 0.031％to 0.409％(with average of 0.098％),and the mineralization coefficient is 0.61～8.19,with the min-eralization rate up to 85％,indicating good prospecting potential.The REE content and mineralization coefficient are the highest in pyrite bearing kaolinite clay rocks,which are the main lithologic assemblages for REE enrich-ment.The samples are LREE enrichment type,with moderate negative Eu anomalies and weak positive Ce anoma-lies.The stratigraphic contact and rare earth elements characteristics indicate that the source materials are mainly from Emei basalts,and a small amount of medium-acid rocks in Emei Large Igneous Province.The enrichment process of rare earth elements includes the initial enrichment formed by Emei basalt weathering,and further mi-gration,adsorption and precipitation of rare earth elements under the oxidation-reduction environment of sea and land interaction,and then the enrichment and mineralization.The discovery of the enrichment of rare earth ele-ments in the clay rocks of the lower part of Longtan Formation in Xingan area has guiding significance for the stra-tegic prospecting.关键词
稀土/龙潭组/富集过程/四川南部Key words
rare earth element/Longtan Formation/enrichment process/Southern Sichuan Province分类
天文与地球科学引用本文复制引用
何洋飘,梁斌,郝雪峰,唐屹,付小方,彭宇..川南兴文地区上二叠统龙潭组下部稀土元素富集特征[J].中国地质调查,2023,10(6):39-49,11.基金项目
四川省自然科学基金"川南地区黏土型锂等关键金属超常富集特征(编号:23NSFSC019)"、四川省地质调查院重大专项"川南地区黏土型关键金属富集机制及资源潜力评价(编号:SCIGS-CZDXM-202300)"及国家重点研发计划"锂能源金属矿产基地深部探测技术示范(编号:2017YFC0602702)"项目联合资助. （编号:23NSFSC019）
