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Precise and accurate determination of 147 Sm/ 144 Nd and 143 Nd/ 144 Nd in monazite using laser ablation-MC-ICPMS

Iizuka, Tsuyoshi; Eggins, Stephen; McCulloch, Malcolm; Kinsley, Leslie; Mortimer, Graham

Description

The 147Sm-143Nd radioactive decay system has been widely used in the Earth sciences as a geochronometer and isotopic tracer. Recent studies have shown that laser ablation-multiple collector-inductively coupled plasma mass spectrometry (LA-MC-ICPMS) is capable of precise and rapid 143Nd/144Nd measurements with high spatial resolution, but its ability to measure 147Sm/144Nd accurately is still poorly constrained. A critical analytical issue is the fractionation effects between 147Sm and 144Nd in...[Show more]

dc.contributor.authorIizuka, Tsuyoshi
dc.contributor.authorEggins, Stephen
dc.contributor.authorMcCulloch, Malcolm
dc.contributor.authorKinsley, Leslie
dc.contributor.authorMortimer, Graham
dc.date.accessioned2015-12-10T23:22:43Z
dc.identifier.issn0009-2541
dc.identifier.urihttp://hdl.handle.net/1885/66636
dc.description.abstractThe 147Sm-143Nd radioactive decay system has been widely used in the Earth sciences as a geochronometer and isotopic tracer. Recent studies have shown that laser ablation-multiple collector-inductively coupled plasma mass spectrometry (LA-MC-ICPMS) is capable of precise and rapid 143Nd/144Nd measurements with high spatial resolution, but its ability to measure 147Sm/144Nd accurately is still poorly constrained. A critical analytical issue is the fractionation effects between 147Sm and 144Nd in LA-MC-ICPMS, which must be carefully corrected to determine robust initial 143Nd/144Nd particularly for ancient geological samples. Here we show that LA-MC-ICPMS can produce substantial (>5%) 147Sm/144Nd fractionation during analysis of monazite and that the fractionation can be corrected with uncertainty of ~1% by using an independently defined 147Sm-143Nd isochron for an Archean monazite standard. In addition, we describe a method for improving the precision and accuracy of LA-MC-ICPMS isotopic measurements by calibration of Faraday amplifier response and isotopic ratio normalization using a synthetic standard. This method has been applied to one Neogene and two Archean monazites, which were also analyzed by isotope dilution-thermal ionization mass spectrometry (ID-TIMS). The LA-MC-ICPMS data were acquired from 16-37μm single spots. The LA-MC-ICPMS determinations of the 145Nd/144Nd for all samples and 143Nd/144Nd for the Neogene monazite compare well with the ID-TIMS results, indicating the robustness of our method to measure Nd isotopic ratios. For the Archean monazites, the method yields initial 143Nd/144Nd values identical to the ID-TIMS values with reproducibilities (2s.d.) of 39 and 58ppm. Analytical precisions of individual spot analyses for initial 143Nd/144Nd were calculated by taking into account the uncertainty in (i) the Nd isotopic normalization to the synthetic monazite, (ii) the correction factor for 147Sm/144Nd fractionation and (iii) the age, which results in 2σ of 45-87ppm. These results clearly demonstrate the capabilities of the LA-MC-ICPMS technique applied to monazite Sm-Nd isotope systematics for early crustal evolution studies.
dc.publisherElsevier
dc.sourceChemical Geology
dc.subjectKeywords: Amplifier response; Early crustal evolution; Elemental fractionation; MC-ICP-MS; Sm-Nd isotope; Electromagnetic induction; Hydrogen bonds; Inductively coupled plasma; Inductively coupled plasma mass spectrometry; Isotopes; Laser ablation; Laser applicatio Amplifier response; Early crustal evolution; Elemental fractionation; LA-MC-ICPMS; Monazite; Sm-Nd isotopes
dc.titlePrecise and accurate determination of 147 Sm/ 144 Nd and 143 Nd/ 144 Nd in monazite using laser ablation-MC-ICPMS
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume282
dc.date.issued2011
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationf2965xPUB1318
local.type.statusPublished Version
local.contributor.affiliationIizuka, Tsuyoshi, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationEggins, Stephen, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMcCulloch, Malcolm, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKinsley, Leslie, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMortimer, Graham, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue1-2
local.bibliographicCitation.startpage45
local.bibliographicCitation.lastpage57
local.identifier.doi10.1016/j.chemgeo.2011.01.008
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T08:12:32Z
local.identifier.scopusID2-s2.0-79851511143
local.identifier.thomsonID000288297900005
CollectionsANU Research Publications

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