Isotopic disequilibrium and lower crustal contamination in slowly ascending magmas: Insights from Proterozoic anorthosites

Bybee, G. M.; Ashwal, Lewis D.

doi:10.1016/j.gca.2015.07.034

Geochimica et Cosmochimica Acta

2015

DOI: 10.1016/j.gca.2015.07.034

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Isotopic disequilibrium and lower crustal contamination in slowly ascending magmas: Insights from Proterozoic anorthosites

G. M. Bybee

Lewis D. Ashwal

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Cited by 12 publications

(1 citation statement)

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“…2007, Turner and Costa 2007). However, despite the availability of in situ techniques for the analysis of major and trace element compositional changes (e.g., EPMA, SIMS and LA‐ICP‐MS), and in situ isotopic analyses (SIMS, LA‐MC‐ICP‐MS), there is still on‐going debate as to the mechanisms of emplacement and subsequent isotopic evolution of many magmatic bodies (Bybee and Ashwal 2015, Charlier et al . 2015).…”

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A Novel, Laser‐Based Microsampling Technique for Texturally Controlled, Combined and Complementary Sr and Nd Isotope Measurements in Silicate Minerals

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Bybee

Tappa

et al. 2022

Geostandard Geoanalytic Res

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The limitations of many in situ microsampling techniques, especially when applied to isotopic analyses, may result in lower measurement precision and limit the ability to compare different isotope systems within the same phase or the same isotope system between phases. High‐precision, combined and complementary isotopic measurements are typically limited to whole‐rock samples or mineral separates at the expense of textural context. We demonstrate that laser ablation instruments could offer an effective, non‐mechanical alternative to micro‐milling for delineating and extracting single crystals, interstitial phases, and sub‐crystal scale features from soluble‐resin thick sections for column chromatography and high precision ID‐TIMS measurement. Systematic testing demonstrated that both modern and legacy laser instruments are capable of ablating through plagioclase, pyroxene and fused glass to depths of 200 μm. Modern instruments offer software benefits to identifying optically‐indistinct petrographic features, chemical zoning and avoiding alteration phases by using overlain high‐resolution datasets. Extracting delineated targets of varying geometry was achieved under binocular microscope using common mineral‐separation tools. Analysis of RM glass used as mineral proxies indicate (a) no significant thermal aureole on ablated margins that could affect measured parent‐daughter ratios, (b) no elevated risk of contamination compared with traditional mineral separation techniques, (c) excellent blanks for low‐yield analyses and (d) high‐precision ID‐TIMS results (87Sr/86Sr and 143Nd/144Nd) for sub‐100 ng Sr loads and sub‐10 ng Nd loads.

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confidence: 99%

A Novel, Laser‐Based Microsampling Technique for Texturally Controlled, Combined and Complementary Sr and Nd Isotope Measurements in Silicate Minerals

Logue

Bybee

Tappa

et al. 2022

Geostandard Geoanalytic Res

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Petrogenesis of Fe-Ti-P mineral deposits associated with Proterozoic anorthosite massifs in the Grenville Province: insights from oxide and apatite trace-element geochemistry at Lac à l’Orignal, Quebec, Canada

Miloski,

Dare,

Morisset

et al. 2023

Miner Deposita

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The link between an anorthosite complex and underlying olivine–Ti-magnetite-rich layered intrusion in Damiao, China: insights into magma chamber processes in the formation of Proterozoic massif-type anorthosites

et al. 2019

Contrib Mineral Petrol

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Isotopic disequilibrium and lower crustal contamination in slowly ascending magmas: Insights from Proterozoic anorthosites

Cited by 12 publications

References 50 publications

A Novel, Laser‐Based Microsampling Technique for Texturally Controlled, Combined and Complementary Sr and Nd Isotope Measurements in Silicate Minerals

A Novel, Laser‐Based Microsampling Technique for Texturally Controlled, Combined and Complementary Sr and Nd Isotope Measurements in Silicate Minerals

Petrogenesis of Fe-Ti-P mineral deposits associated with Proterozoic anorthosite massifs in the Grenville Province: insights from oxide and apatite trace-element geochemistry at Lac à l’Orignal, Quebec, Canada

The link between an anorthosite complex and underlying olivine–Ti-magnetite-rich layered intrusion in Damiao, China: insights into magma chamber processes in the formation of Proterozoic massif-type anorthosites

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