摘要
狮溪锂资源位于贵州省桐梓县狮溪向斜东翼,是首次在黔北务(川)、正(安)、道(真)地区之外的下二叠统大竹园组中发现锂元素的异常富集。狮溪锂富集层位于大竹园组中—上部,具有厚度和品位均较为稳定的特征,含锂岩石类型为致密状和碎屑状铝土岩,主要矿物为伊利石(水白云母)。综合矿物学、岩石学及地球化学特征分析认为,该区域Li的富集与风化淋滤作用密切相关,受古气候、古地貌、地下水位等多因素控制。通过统计黔北地区和狮溪地区含铝岩系数据发现,Li含量与Al2O3、Al/Si值呈规律性变化,Li富集程度与大竹园组的岩性相关,大致可分为Li一般富集区(含矿岩石为泥岩或铝土质泥岩、较高品位铝土矿)和Li高度富集区(含矿岩石为铝土岩和低品位铝土矿)。笔者等通过狮溪锂资源的发现及综合分析认为,在黔北务(川)、正(安)、道(真)地区外围的近岸平原环境,特别是在地势低洼处形成的致密状和碎屑状铝土岩中,具有发现较高品位铝土岩型锂资源的巨大潜力。
Shixi lithium deposit is located in the eastern limb of the Shixi syncline, Tongzi County, Guizhou Province. For the first time, the abnormal enrichment and mineralization of lithium element in the Lower Permian Dazhuyuan Formation was found outside the Wu(chuan), Zheng(’an) and Dao(zhen) areas of northern Guizhou. Hosting in the middle and upper parts of the Dazhuyuan Formation, the lithium enrichment layer is characterized by stable thickness and lithium grade. The lithium-bearing bauxite layer mainly composes of illite(hydromuscovite), with massive and clastic structures. Based on mineralogical, petrological and geochemical study, it is concluded that the enrichment of lithium in the Shixi area is related with the ancient weathering and leaching processes, and is controlled by multiple factors during the bauxitization, such as paleoclimate, palaeogeomorphology and palaeohydrology. According to the geochemical composition of the Dazuyuan Formation in the Wu—Zheng—Dao and Shixi areas, variation of Li content has an obvious correlation with Al2O3content and Al/Si ratio, and is linked with the lithological variations. Moderate Li enrichment is found in mudstone or aluminous mudstone, high grade bauxite;while the high Li enrichment is found in bauxitic claystone and low-grade bauxite. Based on the discovery of the Shixi lithium deposit and comprehensive analysis, it is considered that there is high potential to find high-grade bauxite-type lithium deposit in the nearshore plain environment, especially in palaeokastic depression areas.
作者
邓旭升
余文超
杜远生
杜威
熊兴国
曾禹人
龙建喜
张晗彬
符宏斌
何犇
卢树藩
罗香建
DENG Xusheng;YU Wenchao;DU Yuansheng;DU Wei;XIONG Xingguo;ZENG Yuren;LONG Jianxi;ZHANG Hanbin;FU Hongbin;HE Ben;LU Shufan;LUO Xiangjian(Guizhou Geological Survey,Guiyang,550081;Engineering Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones,Ministry of Natural Resources,Guiyang,550081;School of Earth Sciences,China University of Geosciences(Wuhan)Wuhan,430074;Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas,Ministry of Natural Resources,Guiyang,550081)
出处
《地质论评》
CAS
CSCD
北大核心
2023年第1期133-147,共15页
Geological Review
基金
黔地矿项目(编号:科合[2020] 31号)
国家自然科学基金资助项目(编号:U1812402)
贵州省科技计划项目:贵州省地质调查院院士工作站(编号:黔科合平台人才[2018] 5626)的成果。
关键词
锂资源
大竹园组
早二叠世
铝土岩
贵州
lithium enrichment layer
the Dazuyuan Formation
Early Permian
bauxite
Guizhou Province
