In-situ isotopic dating and tracing of the rare-metal minerals in ore deposit
As strategic key metal mineral resources,rare metals such as tungsten,tin,niobium,tantalum,lithium,beryllium,rubidium,cesium,zirconium,hafnium and Rare Earth Elements(REEs),have important research significance in the national economy and national security.The in situ isotopic dating and tracing of rare metal ore minerals are the most direct means for conducting research on the mineralization of ore deposits,and have unparalleled advantages in bulk analysis.In recent years,the U-Pb dating and Sr-Nd-Hf isotope tracing of rare metal minerals such as tungsten,tin,niobium,tantalum,zirconium and hafnium have developed rapidly,while the Rb-Sr/Lu Hf dating of rare metal minerals such as lithium,beryllium,rubidium,cesium is thriving.This article reviews the main progress in in situ U-Pb dating and Sr-Nd-Hf isotope tracing methods for rare metal minerals such as wolframite,scheelite,cassiterite,columbite-group minerals,monazite,xenotime and bastnaesite.It also looks forward to the in situ Rb-Sr dating of rare metal minerals such as(iron,cesium)zinnwaldite,lepidolite,pollucite,potassium feldspar(Tianhe stone),as well as xenotime,apatite,allanite,monazite and wolframite of the broad prospects of Lu Hf dating for microanalysis.The conclusions have been recognized as follows:(1)In addition to using high sensitivity of SF-ICP-MS,combined with elemental imaging,U-Pb dating of low U minerals can not only reveal the correlation between trace elements,but also quickly lock in high U/Pb regions,significantly improving the success of U-Pb dating of low U minerals;(2)The in situ Hf isotope of columbite-group minerals,and cassiterite can directly trace the source area of rare metal diagenetic minerals in granite pegmatite,and this work urgently needs to be further strengthened;(3)The emergence of collision/reaction ICP-MS has made isotope dating of minerals with high Rb/Sr or high Lu/Hf ratios a reality,and is a new direction for the future development of rare metal for in situ geochronology;(4)The establishment and development of techniques and reference materials complement and promote each other,and are also key technical challenges that urgently need to be addressed.Strategic key metals have become a hot topic in the study of mineralization both domestically and internationally.The study of microanalysis isotopic dating and tracing methods for rare metal minerals such as tungsten,tin,niobium,tantalum,lithium,beryllium,rubidium,cesium,zirconium,hafnium and REEs will undoubtedly make academic contributions to the new round of rare metal deposit research in China.
Rare metal mineralsMicroanalysisIsotopic dating and tracingU-Pb/Rb-Sr/Lu-Hf geochronology
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