Super-enrichment patterns of Li,Be,Rb,and Cs and geochemical prediction for rare element deposits in the Himalayan metallogenic belt
The trace contents of rare elements such as Li,Be,Rb,and Cs in the Earth's crust require hundreds to thousands of times enrichment for the formation of economically viable mineral deposits.This results in an extremely uneven distribution of these resources,making the delineation of super-enriched targets crucial for mineral exploration,especially in extremely difficult access areas in the Tibet Plateau.National geochemical baseline maps have revealed distinct super-enrichment patterns for Li,Be,Rb,and Cs in the Himalayan metallogenic belt.These patterns exhibit the following characteristics:1)All four elements display super-enrichment,with enrichment indices exceeding 2.0.Among them,Be and Cs exhibit the strongest enrichment areas in China,while Li and Rb show the second strongest enrichment;2)the total area of enrichment reaches 104156 km2,with enrichment centers exceeding 1000 km2 in size;3)abnormally enriched areas are distributed in a near east-west direction along the Himalayan orogenic belt,extending from west to east through Zhada-Ritu County,Jilong-Nielamu County,Dingri-Lazi County,Jiangzi County,and Luozha-Cuona-Longzi County;4)The anomalous center areas are mainly closely related to leucogranites containing tourmaline,garnet,spodumene,and other minerals.The large-scale supernormal enrichment of Cs strongly suggests that these Himalayan leucogranites are highly fractionated granite;5)currently,two pegmatite-type Li deposits have been discovered in the Qinjiagang of Dingri County and Gabo of Luozha County,as well as the Cuonadong W-Sn-Be deposit in Cuonao County.The Himalayan rare element super-enrichment areas hold significant potential for the discovery of new Li,Be,Rb,and Cs deposits.
Himalayan metallogenic beltrare elements of Li,Be,Rb,and Csenrichment patterngeochemical prediction
万方数据
维普
