Measurement of in-situ oxygen isotope ratios in monazite by SHRIMP ion microprobe: Standards, protocols and implications

Rubatto, Daniela; Putlitz, Benita; Gauthiez-Putallaz, Laure; Crépisson, Céline; Buick, Ian S.; Zheng, Yong‐Fei

doi:10.1016/j.chemgeo.2014.04.029

Cited by 27 publications

(49 citation statements)

References 53 publications

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“…Analyses followed the protocol and instrumental set‐up described in Rubatto et al . (). The monazite is homogeneous in oxygen isotopes with an average δ 18 O VSMOW of the nineteen analyses at 9.23 ± 0.42 (2 s , Table ).…”

Section: Resultsmentioning

confidence: 97%

“…Diamantina Th content (average 3588 μg g −1 ) is lower than that of reference material USGS44069 (20000–40000 μg g −1 Th), but within the range where matrix correction for oxygen is not recommended according to Rubatto et al . (). To account for the residual uncertainties of the matrix correction, it is, however, safer to quote the obtained δ 18 O value for Diamantina monazite with an uncertainty of 9.2 ± 0.6‰ (2 s ) and consider this as a maximum value.…”

Section: Resultsmentioning

confidence: 97%

“…The repeatability is comparable to that of primary reference material USGS44069 monazite and secondary reference material Itambé monazite (Rubatto et al . ) measured in the same session. Matrix effects related to cheralite and huttonite substitutions (monitored as Th content) can affect oxygen isotope measurements of monazite by SIMS leading to a risk of analytical bias (Rubatto et al .…”

Section: Resultsmentioning

confidence: 99%

“…, O isotopes: Rubatto et al . ). The few widely available monazite reference materials for LA‐ICP‐MS U‐Pb geochronology have Th contents that vary from ~ 1.3–2.8 g/100 g (44069 monazite, Aleinikoff et al .…”

mentioning

confidence: 97%

“…, Rubatto et al . ). Currently, there exist no widely available, low‐Th monazite reference materials for LA‐ICP‐MS U‐Pb geochronology, although a small amount of the low‐Th monazite reference material z2234 has been used in some SHRIMP/SIMS laboratories (Stern and Sanborn ).…”

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confidence: 97%

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

Gonçalves

Lana

Scholz

et al. 2017

Geostandard Geoanalytic Res

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Most monazite reference materials (RMs) for in situ U‐Pb geochronology are rich in Th; however, many hydrothermal ore deposits contain monazite that is low in trace element contents, including Th, U and Pb. Because of potential problems with matrix effects and the lack of appropriate matrix‐matched RMs, such variations can bias dating of hydrothermal deposits. In this paper, we describe a polycrystalline low‐U and low‐Th Diamantina monazite from the Espinhaço Range, SE Brazil. It has a U‐Pb ID‐TIMS weighted mean 207Pb*/235U ratio of 0.62913 ± 0.00079, 206Pb*/238U of 0.079861 ± 0.000088 and 207Pb*/206Pb* of 0.057130 ± 0.000031, yielding a weighted mean 206Pb*/238U date of 495.26 ± 0.54 Ma (95% c.l.). In situ dates acquired with different methods (LA‐(Q, SF, MC)‐ICP‐MS and SIMS) are within uncertainty of the ID‐TIMS data. U‐Pb LA‐(Q, MC)‐ICP‐MS runs, using Diamantina as a primary RM, reproduced the ages of other established RMs within < 1% deviation. The LA‐MC‐ICP‐MS analyses yielded homogeneous Sm‐Nd isotopic compositions (143Nd/144Nd = 0.511427 ± 23, 2s; 147Sm/144Nd = 0.1177 ± 13, 2s) and εNd(495 Ma) of −18.7 ± 0.5 (2s). SIMS oxygen isotope determinations showed measurement reproducibility better than ± 0.3‰ (2s), confirming Diamantina's relative homogeneity at test portion masses below 1 ng.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 97%

mentioning

confidence: 97%

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

Gonçalves

Lana

Scholz

et al. 2017

Geostandard Geoanalytic Res

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Origins of Textural, Compositional, and Isotopic Complexity in Monazite and Its Petrochronological Analysis

Hetherington

Backus

McFarlane

et al. 2017

Geophysical Monograph Series

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Direct zirconU–Pbevidence forpre‐Himalayan HTmetamorphism in the Higher Himalayan Crystallines, eastern Garhwal Himalaya, India

2021

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The high-grade Higher Himalayan Crystallines (HHC), located between the South Tibetan Detachment System and Main Central Thrust in the collision zone between the Indo-Australian and Eurasian plates, have been subject to at least four significant phases of deformation and metamorphism. The earliest of those significantly predates the Cenozoic continent-continent collision, but has been difficult to date isotopically because of later overprinting. Migmatitic paragneiss from the Badrinath Formation in the Dhauliganga Valley, northern Uttarakhand, some of the highestgrade rocks in the HHC, preserves direct evidence of mid-Ordovician metamorphism in the form of 465.8 ± 6.4 Ma zircon overgrowths with extremely low Th/U (0.0038-0.0074). The overgrowths have formed on ca. 2.63-0.71 Ga detrital zircon cores and are themselves overgrown by two generations of Miocene metamorphic zircon with mean Pb/U ages of ca. 21.5 and 18.2 Ma. Monazite from the same sample has a mean Pb/Th age of 19.4 ± 0.2 Ma. The oxygen isotopic compositions of the monazite (δ 18 O: 7.69 ± 0.08‰) and youngest zircon overgrowths (δ 18 O: 7.95 ± 0.12, 8.24 ± 0.09‰) are consistent with mineral growth in a metasediment, but either of the two minerals did not grow in isotopic equilibrium with each other, or the original composition of the monazite has not been preserved. If the quartz (δ 18 O: 13.29 ± 0.11‰) equilibrated with the youngest zircon and its composition has been preserved, then the last episode of zircon growth took place at low temperature, ca. 420 C, after the migmatization. The protolith of the Badrinath migmatite was a Neoproterozoic or Early Palaeozoic metasediment partially melted (and probably migmatized) in the Middle Ordovician. The strong planar foliation currently present in the migmatite is probably the result of mid-crustal extrusional channel flow and HT decompressional partial melting in the Miocene.

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Measurement of in-situ oxygen isotope ratios in monazite by SHRIMP ion microprobe: Standards, protocols and implications

Cited by 27 publications

References 53 publications

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

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

Origins of Textural, Compositional, and Isotopic Complexity in Monazite and Its Petrochronological Analysis

Direct zirconU–Pbevidence forpre‐Himalayan HTmetamorphism in the Higher Himalayan Crystallines, eastern Garhwal Himalaya, India

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