The Diamantina Monazite: A New Low‐Th Reference Material for Microanalysis

Gonçalves, Gonçalo; Lana, Cristiano; Scholz, Ricardo; Buick, Ian S.; Gerdes, Axel; Kamo, Sandra L.; Corfú, Fernando; Rubatto, Daniela; Wiedenbeck, Michael; Nalini, Hermínio Árias; Oliveira, Luiz C.A.

doi:10.1111/ggr.12192

Cited by 42 publications

(26 citation statements)

References 78 publications

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“…An ideal monazite standard would be homogeneous for U-Th-Pb ages and O-Nd isotopic and elemental compositions, as well as being easily available to the scientific community. To date, ten monazite reference materials have been reported for the O isotope, and nine for the Nd isotope (e.g., [12][13][14][15][17][18][19][20][21][22][23][24][25], Table 1). Among them, six are heterogeneous in elemental compositions (eBay, USGS-44069, Itambe, UNIL-Mnz2, M1, and M4), two are heterogeneous in O isotopic compositions (eBay and 554), and Manangoutry monazite is of limited quantity.…”

Section: Introductionmentioning

confidence: 99%

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Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis

Ling

et al. 2019

Minerals

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The oxygen (O) and neodymium (Nd) isotopic composition of monazite provides an ideal tracer of metamorphism and hydrothermal activity. Calibration of the matrix effect and monitoring of the external precision of monazite O–Nd isotopes with microbeam techniques, such as secondary ion mass spectrometry (SIMS) and laser ablation-multicollector-inductively coupled plasma-mass spectrometry (LA-MC-ICPMS), require well-characterized natural monazite standards for precise microbeam measurements. However, the limited number of standards available is impeding the application of monazite O–Nd isotopes. Here, we report on the RW-1 monazite as a potential new working reference material for microbeam analysis of O–Nd isotopes. Microbeam measurements by electron probe microanalysis (EPMA), SIMS, and LA-MC-ICPMS at 10–24 µm scales have confirmed that it is homogeneous in both elemental and O–Nd isotopic compositions. SIMS measurements yield δ18O values consistent, within errors, with those obtained by laser fluorination techniques. Precise analyses of Nd isotope by thermal ionization mass spectrometry (TIMS) are consistent with mean results of LA-MC-ICPMS analyses. We recommend δ18O = 6.30‰ ± 0.16‰ (2SD) and 143Nd/144Nd = 0.512282 ± 0.000011 (2SD) as being the reference values for the RW-1 monazite.

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Section: Introductionmentioning

confidence: 99%

“…End-members are calculated according to Pyle et al[8]. The Diamantina, UNIL-Mnz1, USGS-44069, Itambe, Moacyr, UNIL-Mnz2, and Manangoutry data are from Rubatto et al[14], Didier et al[15], and Gonçalves et al[19].…”

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confidence: 99%

Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis

Ling

et al. 2019

Minerals

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“…Chemical compositions were also obtained using an Element II SF‐ICP‐MS, coupled with a G2‐PhotonMachines excimer (193 nm) laser ablation system (e.g., Santos et al, ) at the Laboratório de Geoquímica (UFOP). U‐Pb ages were obtained using quadrupole, sector field single collector, and multicollector ICP‐MS instruments (LA‐Q‐ICP‐MS, LA‐SF‐ICP‐MS and LA‐MC‐ICP‐MS) at UFOP (e.g., Gonçalves et al, ; Santos et al, ; Takenaka et al, ). The U‐Pb measurements were undertaken in automated mode, with a spatial resolution of 20–30 μm.…”

Section: Methodsmentioning

confidence: 99%

Characterization of Xenotime From Datas (Brazil) as a Potential Reference Material for In Situ U‐Pb Geochronology

Vasconcelos

Gonçalves

Lana

et al. 2018

Geochem Geophys Geosyst

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This study investigates five megacrysts of xenotime (XN01, XN02, XN03, XN04, and XN05) as potential reference materials (RMs) for U‐Pb geochronology. These crystals belong to a 300 g xenotime assortment, collected from alluvial deposits in SE Brazil. Electron microprobe and Laser Ablation‐Inductively Coupled Plasma‐Mass Spectrometry (LA‐ICP‐MS) analyses show that the selected crystals are internally homogeneous for most rare earth element, (REE, except some light REE) but are relatively heterogeneous for U and Th. The xenotime REE patterns are consistent with an origin from hydrothermal quartz veins in the Datas area that cut greenschist‐facies metasediments and that locally contain other accessory phases such as rutile and monazite. High‐precision U‐Pb Isotope Dilution‐Thermal Ionization Mass Spectrometry (ID‐TIMS) analyses showed slight age heterogeneity for the XN01 crystal not observed in the XN02 sample. The two crystals have slightly different average 206Pb/238U ages of 513.4 ± 0.5 Ma (2 s) and 515.4 ± 0.2 Ma (2 s), respectively. In situ U‐Pb isotope data acquired via LA‐(Q,SF,MC)‐ICP‐MS are within the uncertainty of the ID‐TIMS data, showing homogeneity at the 1% precision of the laser ablation (and probably ion microprobe) technique. U‐Pb LA‐(MC, SF)‐ICP‐MS analyses, using XN01 as a primary RM, reproduced the ages of other established RMs within less than 1% deviation. Other Datas crystals (XN03‐05) also display a reproducibility in Pb/U dates better than 1% on LA‐ICP‐MS, making them good candidates for further testing by ID‐TIMS.

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“…Recently, Gonçalves et al . () investigated a low‐U and low‐Th Diamantina monazite from SE Brazil and proposed this sample as a primary RM. The analytical data show that the Sm‐Nd and oxygen isotopic compositions are homogeneous.…”

Section: Reference Materialsmentioning

confidence: 99%

GGR Biennial Critical Review: Analytical Developments Since 2014

Linge

Bèdard

Bugoi

et al. 2017

Geostandard Geoanalytic Res

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This GGR biennial critical review covers developments and innovations in key analytical methods published since January 2014, relevant to the chemical, isotopic and crystallographic characterisation of geological and environmental materials. In nine selected analytical fields, publications considered to be of wide significance are summarised, background information is provided and their importance evaluated. In addition to instrumental technologies, this review also presents a summary of new developments in the preparation and characterisation of rock, microanalytical and isotopic reference materials, including a précis of recent changes and revisions to ISO guidelines for reference material characterisation and reporting. Selected reports are provided of isotope ratio analyses by both solution-nebulisation MC-ICP-MS and laser ablation-ICP-MS, as well as of radioactive isotope geochronology by LA-ICP-MS. Most of the analytical techniques elaborated continue to provide new applications for geochemical analysis, however it is noted that instrumental neutron activation analysis has become less popular in recent years, mostly due to the reduced availability of nuclear reactors to act as a neutron source. Many of the newer applications reported here provide analysis at increasingly finer resolution. Examples include atom probe tomography, a very sensitive method providing atomic scale information, nanoscale SIMS, for isotopic imaging of geological and biological samples, and micro-XRF, which has a spatial resolution many orders of magnitude smaller than conventional XRF

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The Diamantina Monazite: A New Low‐Th Reference Material for Microanalysis

Cited by 42 publications

References 78 publications

Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis

Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis

Characterization of Xenotime From Datas (Brazil) as a Potential Reference Material for In Situ U‐Pb Geochronology

GGR Biennial Critical Review: Analytical Developments Since 2014

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