In situ U–Pb geochronology of vesuvianite by LA-SF-ICP-MS

Abstract

LA-SF-ICP-MS method for U–Pb dating of vesuvianite with the aim of establishing well characterized U–Pb vesuvianite reference materials for microanalysis.

In situ Sr–Nd isotope analysis of vesuvianite by LA-MC-ICP-MS: methodology and application

“…ID-TIMS analyses of six small crystal fragments of M6635 yielded a concordant 206 Pb/ 238 U age of 228.1 ± 0.5 Ma (2s), while the six aliquots of M784 yielded a concordant 206 Pb/ 238 U age of 224.8 ± 1.8 Ma (2s) in our previous study. 12 M1377 vesuvianite is an approximately 15 × 10 × 8 cm large specimen, and LA-SF-ICP-MS data plotted on the Tera–Wasserburg diagram produced an intercept age of 225.0 ± 3.3 Ma (2s; n = 20). 12 Zhu et al 54 measured the Sr–Nd isotopic compositions of Saima nepheline syenites using solution MC-ICP-MS and obtained initial 87 Sr/ 86 Sr ratios of 0.70804–0.70829 and negative ε Nd ( t ) values of −12.7 to −12.2.…”

“…The high isomorphic capacity and stability of vesuvianite favours the incorporation of variable amounts of U (several tens or hundreds of μg g −1 ), making it a potential mineral for U–Pb dating. 11–14 As a Ca-rich mineral, vesuvianite has moderate or high Sr (several tens to thousands of μg g −1 ) and low Rb (<1 μg g −1 ) contents, 6,7,9 which mean the measured 87 Sr/ 86 Sr ratio represents the initial Sr isotopic composition of the fluid or melt from which the vesuvianite crystallised. 15,16 Furthermore, vesuvianite can be enriched in light rare earth elements (LREEs).…”

Atomic spectrometry update – a review of advances in environmental analysis

“…There has been much research activity focused on the U–Pb dating of accessory minerals other than zircon by microanalytical techniques. Minerals investigated included: apatite 245 by LA-ICP-MS/MS, carbonates 246 by LA-MC-ICP-MS, cassiterite 247 by LA-SF-ICP-MS, garnet 248 by SIMS, ilmenite 249 by LA-ICP-MS, rutile 250 by LA-ICP-MS, scheelite 251 by LA-SF-ICP-MS, titanite 250,252 by LA-ICP-MS and SIMS, vesuvianite 253 by LA-SF-ICP-MS, wolframite 254 by LA-ICP-MS and xenotime 255 by APT. The continued development of U–Pb dating methods to a wide range of minerals is fundamental in increasing the number of geochronological tools available for unravelling geological processes.…”

A new appraisal of ilmenite U–Pb dating method by LA-SF-ICP-MS

“…Non-matrix matched calibrations have increasingly been used in LA-ICP-MS U–Pb analysis owing to a lack of matrix-matched reference materials (RMs), e.g. , NIST 610 for zircon, monazite, and xenotime; 22 NIST 612 for cassiterite; 23 Plesovice zircon for allanite; 24 zircon 91500 for rutile and garnet; 25–27 zircon 91500 and schorlomite for vesuvianite; 28,29 wolframite YGX for ferberite, hübnerite, and scheelite; 30,31 and xenotime XN01 for bastnaesite. 32 However, matrix effects exist for most of the above minerals due to different ablation behaviors, and thus, special conditions have been employed to reduce matrix effects, including adding water vapor and N 2 , 21,22,32 using a large spot size of ≥44 μm, 25 as well as using a low laser sampling rate, a low energy density, short ablation times (∼30 s), 23,33 and shorter wavelength of ablation laser.…”