随着光伏产业和新能源汽车产业的蓬勃发展,国内外锂资源需求持续增加,黏土型锂矿逐渐成为矿产勘查的重点.经地质调查,南漳县西部梁山组黏土岩存在锂的超常富集现象,具备形成独立锂矿床的潜力,而梁山组富锂黏土岩物源特征、沉积环境和成矿规律的研究仍为空白.因此,有必要研究南漳县西部梁山组富锂黏土岩物源特征,以进一步揭示其源区地质特征,为后续找矿工作提供有效指导.经测定,南漳县西部梁山组富锂黏土岩样品Al2O3/TiO2 比值为14.45～37.69,平均值为27.68;K2O/Al2O3 比值为0.001 7～0.020 6,平均值为0.009 8;Cr/Zr比值为0.144 9～0.351 9,平均值为0.277 5.结果表明,黏土岩物源区主要为长英质岩石.La/Sc-Th/Co图解、Zr-TiO2 图解中,所有样品点均落在长英质物源区,显示物源的单一性.大多数样品的化学蚀变指数(Chemical Index of Alteration,CIA)、化学风化指数(Chemical Index of Weathering,CIW)均在90以上,说明源岩经历强烈化学风化作用.
Source Area Characteristics of Lithium Rich Clay Rocks in the Liangshan Formation of Western Nanzhang County
With the vigorous development of the photovoltaic industry and the new energy vehicle industry,the demand for lithium resources at home and abroad continues to increase,and clay type lithium mines have gradually become the focus of mineral exploration.According to geological surveys,there is an abnormal enrichment of lithium in the clay rocks of the Liangshan Formation in the western Nanzhang county,which has the potential to form independent lithium deposits,however,research on the source characteristics,sedimentary environment,and mineralization laws of the lithium rich clay rocks of the Liangshan Formation is still blank.Therefore,it is necessary to study the source characteristics of lithium rich clay rocks in the Liangshan Formation in the western Nanzhang county,in order to further reveal the geological characteristics of its source area and provide effective guidance for subsequent mineral exploration work.According to measurements,the Al2O3/TiO2 ratio of the lithium rich clay rock samples from the Liangshan Formation in the western Nanzhang county ranges from 14.45 to 37.69,with an average value of 27.68;the K2O/Al2O3 ratio ranges from 0.001 7 to 0.020 6,with an average value of 0.009 8;the Cr/Zr ratio ranges from 0.144 9 to 0.351 9,with an average value of 0.277 5.The results indicate that the clay source area is mainly composed of felsic rocks.In the La/Sc-Th/Co diagram and Zr-TiO2 diagram,all sample points are located in the source region of feldspar,indicating the singularity of the source.The Chemical Index of Alteration(CIA)and Chemical Index of Weathering(CIW)of most samples are above 90,indicating that the source rock has undergone strong chemical weathering.
Liangshan Formationlithium rich clay rocksourceChemical Index of Alteration(CIA)Chemical Index of Weathering(CIW)Nanzhang county
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