Laser ablation split-stream analysis of the Sm-Nd and U-Pb isotope compositions of monazite, titanite, and apatite – Improvements, potential reference materials, and application to the Archean Saglek Block gneisses

Fisher, Christopher M.; Bauer, Ann M.; Luo, Yan; Sarkar, Chiranjeeb; Hanchar, John M.; Vervoort, Jeffrey D.; Tapster, Simon R.; Horstwood, Matt; Pearson, D. Graham. 2020 Laser ablation split-stream analysis of the Sm-Nd and U-Pb isotope compositions of monazite, titanite, and apatite – Improvements, potential reference materials, and application to the Archean Saglek Block gneisses. Chemical Geology, 539, 119493. https://doi.org/10.1016/j.chemgeo.2020.119493

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Official URL: http://dx.doi.org/10.1016/j.chemgeo.2020.119493

Abstract/Summary

Continued improvements in both ICPMS (inductively-coupled plasma mass spectrometry) and laser ablation technologies are fueling advancements in accessory mineral investigations and their related isotope systems of interest, and are now being applied to a wide range of geological applications. In this contribution we present an updated methodology for laser ablation split-stream (LASS) analysis of the light rare earth element (LREE) enriched minerals monazite, titanite, and apatite for simultaneous analysis of the U-Th-Pb age (or trace element content) and the Sm-Nd isotope system. The data were collected with the current generation of high-sensitivity ICPMS and laser systems (ThermoFinnigan NeptunePlus MC-ICPMS and Element XR SF-ICPMS- coupled to a RESOlution 193 nm ArF excimer laser system). The increased sensitivity of these ICPMS instruments allows for improved spatial resolution and the ability to target minerals which previously contained insufficient concentrations of elements of interest (e.g., Sm-Nd in apatite), making their analysis difficult, if not impossible, using less sensitive instruments. Furthermore, the higher sensitivity allows less aggressive ablation parameters that facilitate thin section sampling and reduces inter-element and isotopic fractionation.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.chemgeo.2020.119493
ISSN:	00092541
Date made live:	07 Jul 2020 13:11 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528108

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.chemgeo.2020.119493

ISSN:

00092541

Date made live:

07 Jul 2020 13:11 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/528108