西藏羊八井—当雄断裂带地热系统B、Li、Rb、Cs富集机制OA北大核心CSTPCD

[Objective]There are abundant geothermal resources in Tibet,and most hot springs or sinters are rarely enriched with elements such as B,Li,Rb,and Cs.In addition to their potential economic value,they are considered important mineral sources of salt lake resources.It is not only of basic theoretical significance but also of guiding sig-nificance to correctly evaluate the potential value of mineral resources to study the provenance,evolution,and enrich-ment law of B,Li,Rb,and Cs in geothermal water.[Methods]Based on the chemical composition and B and Li iso-tope system analysis of hot springs,rivers,and springs in the typical Yangbajing-Dangxiong rift,boiling springs were found to be mostly Na-Cl type and moderately alkaline,belonging to continental non-volcanic geothermal systems.The most obvious geochemical characteristic of hot springs is a negative δ11B value,and the higher the concentration of B and Li,the more negative the B and Li isotopes are.[Result and Conclusions]The upwelling of Earth's crust remelting residual magma fluid can reasonably explain the unique element enrichment and combination characteris-tics,isotope distribution law,and extremely high heat storage temperature of this geothermal system.Geothermal sys-tems like Yangbajing-Dangxiong rift are not only a good prospect of geothermal energy development,but have also all kinds of abnormally or supernormally enriched elements such as B,Li,Rb,and Cs that can be used as mineral re-sources based on the coupling relationship between magmatic activity and enrichment laws of various elements.