Simultaneous determination of Sm–Nd isotopes, trace-element compositions and U–Pb ages of titanite using a laser-ablation split-stream technique with the addition of water vapor. Issue 11 (28th September 2021)

• Record Type: Journal Article
• Authors: Zhang, Le; Wu, Jia-Lin; Zhang, Yan-Qiang; Yang, Ya-Nan; He, Peng-Li; Xia, Xiao-Ping; Ren, Zhong-Yuan
• Is Part Of: Journal of analytical atomic spectrometry. Volume 36:Issue 11(2021)
• Page Start: 2312
• Page End: 2321
• Publication Date: 2021-09-28
• Subjects: Atomic spectra -- Periodicals; Atomic absorption spectroscopy -- Periodicals; 543.0858
• DOI: 10.1039/d1ja00246e
• Languages: English
• ISSNs: 0267-9477

Abstract

Abstract : We reported the effect of water vapor on MC–ICP–MS and proposed a method for simultaneous determination of Sm–Nd isotopes, trace-element compositions and U–Pb ages of titanite. Abstract : Titanite is a widespread accessory nesosilicate with high trace-element contents including rare-earth elements, Th, and U, and is thus suitable for in situ isotopic and trace-element analyses and U–Pb dating. Here we describe a laser-ablation split-stream technique for simultaneously determining Sm–Nd isotopes, trace-element compositions and U–Pb ages in titanite. A laser ablation system was connected to multi-collector (MC) and sector field (SF) inductively coupled plasma–mass spectrometry (ICP–MS) systems. The laser-ablated aerosol was split into two gas streams and transported simultaneously to the MC–ICP–MS system for Sm–Nd isotope analysis and to the SF–ICP–MS system for trace-element analysis and U–Pb dating. A small flow of water vapor was introduced to the gas stream after the LA chamber to improve the sensitivity of Nd (by 40%) on MC–ICP–MS and to maintain oxide yields at low levels for SF–ICP–MS trace-element analyses. Three well-constrained reference titanite standards (T3, OLT1, and Ontario) were analysed to evaluate precision and accuracy. Resulting Sm–Nd isotopic and trace-element compositions and U–Pb ages were consistent with recommended values. The method was applied in simultaneously determining Sm–Nd isotopes, trace-element compositions and U–Pb ages for titanite from the Manjinggou marble of the North China Craton.