Título:	Vermilion monazite : a new archean reference material for u-pb and sm-nd microanalysis
Autor(es):	Mazoz, Ariela Oliveira Gonçalves, Guilherme de Oliveira Lana, Cristiano Buick, Ian S. McSwiggen, Peter L. Corfu, Fernando Kamo, Sandra L. Bin Fu Hao Wang Moreira, Hugo Scholz, Ricardo Martins, Lorena Peixoto, Eliza Dantas, Elton Luiz Santos, Roberto Ventura
ORCID:	https://orcid.org/0000-0003-0455-8784 https://orcid.org/0000-0002-7954-5059 https://orcid.org/0000-0001-6071-8100
Afiliação do autor:	Universidade de Brasília, Instituto de Geociências Universidade de Brasília, Instituto de Geociências Stellenbosch University, The institution will open in a new tab, Stellenbosch, South Africa Stellenbosch University, The institution will open in a new tab, Stellenbosch, South Africa McSwiggen & Associates, 2855 Anthony Lane South, Suite B15, St. Anthony, MN 55418, USA University of Oslo, Oslo, Norway University of Toronto, Department of Earth Sciences, Jack Satterly Geochronology Laboratory The Australian National University, Research School of Earth Sciences, Canberra, Australia Institute of Geology and Geophysics, Chinese Academy of Sciences, State Key Laboratory of Lithospheric Evolution, Beijing, China University of Portsmouth, Geography and Geosciences, School of the Environment, UK Stellenbosch University, The institution will open in a new tab, Stellenbosch, South Africa Stellenbosch University, The institution will open in a new tab, Stellenbosch, South Africa Universidade de Brasília, Instituto de Geociências Universidade de Brasília, Instituto de Geociências Universidade de Brasília, Instituto de Geociências
Assunto:	Monazita Geocronologia U-Pb Materiais de referência geocronológicos Sistema isotópico Sm-Nd Geocronologia isotópica
Data de publicação:	2024
Editora:	Elsevier BV
Referência:	MAZOZ, Ariela et al. Vermilion monazite: a new archean reference material for u-pb and sm-nd microanalysis. Chemical Geology, [S. l.], v. 658, art 122121, 2024. DOI: https://doi.org/10.1016/j.chemgeo.2024.122121. Disponível em: https://www.sciencedirect.com/science/article/pii/S0009254124002018?via%3Dihub.
Abstract:	Monazite (Vermilion) from the ∼2.7 Ga Vermilion Granitic Complex (Minnesota, USA) was investigated as a potential reference material for U-Pb geochronology, using electron microprobe, high-precision ID-TIMS and high-spatial resolution techniques (LA-(Q/SF/MC)-ICP-MS and SHRIMP). Vermilion monazite is relatively homogeneous in BSE images. It is characterised as a monazite-(Ce) with uniform, relatively LREE-enriched chondrite-normalised REE patterns (Eu/Eu* = 0.074–0.085). ID-TIMS U-Pb analyses yielded concordant to slightly (−0.6% to 1.8%) discordant isotope data with weighted mean 207Pb*/206Pb* dates of 2668.6 ± 1.8 Ma (2σ, MSWD = 1.3, n = 3) and 2666.8 ± 1.8 Ma (2σ, MSWD = 4.0, n = 4). High-spatial resolution data from SHRIMP and LA-(Q/SF/MC)-ICP-MS agree with the ID-TIMS age. Using Vermilion monazite as primary reference material, LA-SF-ICP-MS analyses reproduced the age of several other reference monazites within −1.13% to +1.64% accuracy. Nd isotopes obtained via ID-TIMS and solution MC-ICP-MS returned consistent 143Nd/144Nd ratios of 0.510694 ± 0.000040 (2σ) and 0.510726 ± 0.000014 (2σ), respectively. The LA-MC-ICP-MS 143Nd/144Nd ratios of 0.51071 ± 0.00001 (2σ) and 0.51065 ± 0.00001 (2σ) are also in agreement within uncertainties. Results of Sm-Nd isotope analyses by LA-MC-ICP-MS from two laboratories yielded mean 147Sm/144Nd ratios of 0.0869 ± 0.0002 (2.5% RSD, 2σ, n = 58) and 0.0835 ± 0.0001 (2.2% RSD, 2σ, n = 50), reflecting small variations in individual fragments. The initial epsilon Nd (εNdi) varies from −0.8 ± 0.5 to 0.6 ± 0.4 (2σ). The reproducibility of our results shows that Vermilion monazite can be used as a primary reference material for U-Pb geochronology and is suitable as a secondary reference material for Sm-Nd isotopic tracing. The Archean age of Vermilion monazite, the oldest available as a reference material, will facilitate the investigation of Archean crustal evolution processes and broaden the prospect of studying ancient metamorphic events by combining matrix-matched U-Pb geochronology and Sm-Nd isotopic tracing.
Unidade Acadêmica:	Instituto de Geociências (IG)
DOI:	https://doi.org/10.1016/j.chemgeo.2024.122121
Versão da editora:	https://www.sciencedirect.com/science/article/pii/S0009254124002018?via%3Dihub
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