A reasonable classification of deposits holds great significance for identifying prospecting targets and deploying exploration. The world ’s keen demand for lithium resources has expedited the discovery of numerous n...A reasonable classification of deposits holds great significance for identifying prospecting targets and deploying exploration. The world ’s keen demand for lithium resources has expedited the discovery of numerous novel lithium resources. Given the presence of varied classification criteria for lithium resources presently, this study further ascertained and classified the lithium resources according to their occurrence modes, obtaining 10 types and 5 subtypes of lithium deposits(resources) based on endogenetic and exogenetic factors. As indicated by surveys of Cenozoic exogenetic lithium deposits in China and abroad,the formation and distribution of the deposits are primarily determined by plate collision zones, their primary material sources are linked to the anatectic magmas in the deep oceanic crust, and they were formed primarily during the Miocene and Late Paleogene. The researchers ascertained that these deposits,especially those of the salt lake, geothermal, and volcanic deposit types, are formed by unique slightly acidic magmas, tend to migrate and accumulate toward low-lying areas, and display supernormal enrichment. However, the material sources of lithium deposits(resources) of the Neopaleozoic clay subtype and the deep brine type are yet to be further identified. Given the various types and complex origins of lithium deposits(resources), which were formed due to the interactions of multiple spheres, it is recommended that the mineralization of exogenetic lithium deposits(resources) be investigated by integrating tectono-geochemistry, paleoatmospheric circulation, and salinology. So far, industrialized lithium extraction is primarily achieved in lithium deposits of the salt lake, clay, and hard rock types. The lithium extraction employs different processes, with lithium extraction from salt lake-type lithium deposits proving the most energy-saving and cost-effective.展开更多
The structural and thermoelasticity of antifluorite magnesium silicide at high temperatures were studied by using the plane-wave pseudo-potential method in the framework of density functional theory. The bulk ground-s...The structural and thermoelasticity of antifluorite magnesium silicide at high temperatures were studied by using the plane-wave pseudo-potential method in the framework of density functional theory. The bulk ground-state quantities such as lattice constants, cell volumes, band structures and elastic constants were calculated. It showed that the elastic constants of Mg 2 Si were well consistent with the experimental data under ambient conditions. The crystal cell volume and bulk modulus of Mg 2 Si as functions of applied temperature were also presented. The lattice dynamics was applied to determine the phonon dispersion curves. To complete the fundamental characterisation of this crystal, the coefficients of thermal expansion (CTE), isochoric heat capacities and Debye temperature of Mg 2 Si in the whole temperature range from 0 K to 1300 K and pressure range from 0 GPa to 7.48 GPa were investigated. The results were in favourable agreement with the previous theoretical calculations and the existing experimental data.展开更多
基金funded by the major research program of the of National Natural Science Foundation of China entitled Metallogenic Mechanisms and Regularity of the Lithium Ore Concentration Area in the Zabuye Salt Lake, Tibet (91962219)Science and Technology Major Project of the Tibet Autonomous Region ’s Science and Techonlogy Plan (XZ202201ZD0004G01)a geological survey project of China Geological Survey (DD20230037)。
文摘A reasonable classification of deposits holds great significance for identifying prospecting targets and deploying exploration. The world ’s keen demand for lithium resources has expedited the discovery of numerous novel lithium resources. Given the presence of varied classification criteria for lithium resources presently, this study further ascertained and classified the lithium resources according to their occurrence modes, obtaining 10 types and 5 subtypes of lithium deposits(resources) based on endogenetic and exogenetic factors. As indicated by surveys of Cenozoic exogenetic lithium deposits in China and abroad,the formation and distribution of the deposits are primarily determined by plate collision zones, their primary material sources are linked to the anatectic magmas in the deep oceanic crust, and they were formed primarily during the Miocene and Late Paleogene. The researchers ascertained that these deposits,especially those of the salt lake, geothermal, and volcanic deposit types, are formed by unique slightly acidic magmas, tend to migrate and accumulate toward low-lying areas, and display supernormal enrichment. However, the material sources of lithium deposits(resources) of the Neopaleozoic clay subtype and the deep brine type are yet to be further identified. Given the various types and complex origins of lithium deposits(resources), which were formed due to the interactions of multiple spheres, it is recommended that the mineralization of exogenetic lithium deposits(resources) be investigated by integrating tectono-geochemistry, paleoatmospheric circulation, and salinology. So far, industrialized lithium extraction is primarily achieved in lithium deposits of the salt lake, clay, and hard rock types. The lithium extraction employs different processes, with lithium extraction from salt lake-type lithium deposits proving the most energy-saving and cost-effective.
基金supported by the National Natural Science Foundation of China(Grant Nos.11005088 and 11047186)the Projects of Basic and Advanced Technology of Henan Province of China(Grant No.1023004110241)the Science and Technology of Henan Province of China(Grant No.082300410050)
文摘The structural and thermoelasticity of antifluorite magnesium silicide at high temperatures were studied by using the plane-wave pseudo-potential method in the framework of density functional theory. The bulk ground-state quantities such as lattice constants, cell volumes, band structures and elastic constants were calculated. It showed that the elastic constants of Mg 2 Si were well consistent with the experimental data under ambient conditions. The crystal cell volume and bulk modulus of Mg 2 Si as functions of applied temperature were also presented. The lattice dynamics was applied to determine the phonon dispersion curves. To complete the fundamental characterisation of this crystal, the coefficients of thermal expansion (CTE), isochoric heat capacities and Debye temperature of Mg 2 Si in the whole temperature range from 0 K to 1300 K and pressure range from 0 GPa to 7.48 GPa were investigated. The results were in favourable agreement with the previous theoretical calculations and the existing experimental data.
