摘要
为厘清黔中地区下石炭统九架炉组铝质黏土岩系中锂的超常富集机制（Li2O平均含量0.21%,最高达0.74%）,为寻找锂资源提供新的途径,对黔中地区4个典型剖面进行了富锂黏土岩的主量、微量及稀土元素在剖面上的分布规律研究。结果表明,下石炭统九架炉组与下伏寒武系娄山关群白云岩的不活动元素比值相同,且其稀土元素球粒陨石标准化配分模式相似,都以轻稀土富集的平缓右倾型为特征,暗示九架炉组的形成可能与下伏娄山关群白云岩的风化和酸不溶物的积累有关。元素相关性分析和风化作用强度指标研究发现,锂含量与CIA和Si/Al值皆呈负相关的关系。初步推测,泥质白云岩的风化分解,主量元素的大幅度流失,是造成锂超常富集的重要机制。
In order to clarify the supernormal enrichment mechanisms of Lithium（ Li） in clay rocks of the Lower Carboniferous Jiujialu Formation at central Guizhou Province（ averaging 0. 21%,and the highest concentration up to 0. 74%） and find a new approach to explore Li resources,we investigated the elemental distribution of four typical cross sections of Lirich clay rocks. Same ratios of immobile element pairs and similar LREE-rich REE distribution pattern of clay rocks in the carboniferous Jiujialu formation and underlying Cambrian Loushanguan group dolomites suggested that the Jiujialu Formation may result from weathering of underlying dolomites and accumulation of acidic insoluble matter. Correlation analysis and weathering intensity index showed that Li content was negatively correlated with the CIA index and Si/Al ratio. Therefore,weathering decomposition of argillaceous dolomite and substantial loss of major elements may play an important role in Li supernormal enrichment.
作者
崔燚
罗重光
徐林
张海
邓明国
顾汉念
孟勇
秦朝建
温汉捷
CUI Yi1,2 , LUO Chong-guang2 , XU Lin2,3 , ZHANG Hai4 , DENG Ming-guo1 , GU Han-nian2, MENG Yong2, QIN Chao-jian2, WEN Han-jie2,3.(1. Faculty of Land Resource Engineering, Kunming University of Science And Technology, Kunming 650093, China; 2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China ; 3. University of Chinese Academy of Sciences, Beijing 100049, China ; 4. Geological Party 113, Guizhou Bureau of Geology and Minerals Exploration ＆ Development, Liupanshui Guizhou 553001, China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2018年第4期696-704,共9页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展计划项目(2017YFC0602500)
贵州省科技创新人才团队(黔科合平台人才[2017]5657)
贵州省自然科学基金重点项目(黔科字201401)
贵州省地矿局地质科研项目(黔地矿科合2015-05号,2016-05号,黔科合基础2017-1092)
国家自然科学基金项目(41363001,41762009)
关键词
黔中
黏土岩
白云岩
锂
风化作用
富集机理
central Guizhou Province
clay rock
dolomite
lithium
weathering
enrichment mechanism
