Complex Nanostructures in Shocked, Annealed, and Metamorphosed Baddeleyite Defined by Atom Probe Tomography

White, L. F.; Darling, James; Moser, D. E.; Reinhard, David A.; Larson, David J.; Lawrence, D.; Martin, Isabelle

doi:10.1002/9781119227250.ch17

Cited by 9 publications

(9 citation statements)

References 85 publications

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“…Yet in this case, there is a clear distinction in interface composition dependent on the orientation of the interface (Figure ), a feature that is recognised in interface complexions in manufactured materials (e.g., Cantwell et al ). Additional studies on low‐angle boundaries in zircon (Piazolo et al , Reddy et al ), titanite (Kirkland et al ) and baddeleyite (White et al , ) have all documented the interfacial segregation of incompatible trace elements.…”

Section: Geoscience Applicationsmentioning

confidence: 99%

“…A similar study on discrete Pb reservoirs in discordant zircon provided some insights into the mechanisms of Pb segregation and the role of defects in forming discrete Pb isotopic reservoirs (Peterman et al , ; Figure b). Trace element mobility has been studied in undeformed zircon (Piazolo et al , Peterman et al ) and deformed zircon (Piazolo et al , Reddy et al ), and similar studies have been undertaken on baddeleyite (White et al , Reinhard et al , White et al , b), monazite (Fougerouse et al , Seydoux‐Guillaume et al ), titanite (Kirkland et al ) and rutile (Verberne et al ).…”

Section: Geoscience Applicationsmentioning

confidence: 99%

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Atom Probe Tomography: Development and Application to the Geosciences

Reddy

Saxey

Rickard

et al. 2020

Geostandard Geoanalytic Res

110

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Atom probe tomography (APT) is an analytical technique that provides quantitative three‐dimensional elemental and isotopic analyses at sub‐nanometre resolution across the whole periodic table. Although developed and mostly used in the materials science and semiconductor fields, recent years have seen increasing development and application in the geoscience and planetary science disciplines. Atom probe studies demonstrate compositional complexity at the nanoscale and provide fundamental new insights into the atom‐scale mechanisms taking place in minerals over geological time. Here, we provide an overview of APT, including the historical development and technical aspects of the instrumentation, and the fundamentals of data acquisition, data processing and data reconstruction. We also review previous studies and highlight the potential future applications of nanoscale geochemical studies of natural materials.

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Section: Geoscience Applicationsmentioning

confidence: 99%

Section: Geoscience Applicationsmentioning

confidence: 99%

Atom Probe Tomography: Development and Application to the Geosciences

Reddy

Saxey

Rickard

et al. 2020

Geostandard Geoanalytic Res

110

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“…Microstructural studies of accessory minerals that are used as reliable geochronometers-zircon, baddeleyite, xenotime, or monazite-have provided an entirely new approach to assess shock deformation at lm scale (e.g., Moser et al 2013;Erickson et al 2015;Darling et al 2016;White et al 2017). In particular, xenotime and baddeleyite were observed to have undergone significant deformation at lower shock pressures (Cavosie et al 2016;White et al 2018aWhite et al , 2018b. Importantly, these studies highlighted the importance of understanding the microstructure of targeted geochronometers when interpreting their complex U-Pb and Pb-Pb ages.…”

Section: The Shock-pressure Barometrymentioning

confidence: 99%

“…; White et al. , ). Importantly, these studies highlighted the importance of understanding the microstructure of targeted geochronometers when interpreting their complex U‐Pb and Pb‐Pb ages.…”

Section: Introductionmentioning

confidence: 98%

Shock‐induced microtextures in lunar apatite and merrillite

Černok

White

Darling

et al. 2019

Meteorit & Planetary Scien

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Apatite and merrillite are the most common phosphate minerals in a wide range of planetary materials and are key accessory phases for in situ age dating, as well as for determination of the volatile abundances and their isotopic composition. Although most lunar and meteoritic samples show at least some evidence of impact metamorphism, relatively little is known about how these two phosphates respond to shock‐loading. In this work, we analyzed a set of well‐studied lunar highlands samples (Apollo 17 Mg‐suite rocks 76535, 76335, 72255, 78235, and 78236), in order of displaying increasing shock deformation stages from S1 to S6. We determined the stage of shock deformation of the rock based on existing plagioclase shock‐pressure barometry using optical microscopy, Raman spectroscopy, and SEM‐based panchromatic cathodoluminescence (CL) imaging of plagioclase. We then inspected the microtexture of apatite and merrillite through an integrated study of Raman spectroscopy, SEM‐CL imaging, and electron backscatter diffraction (EBSD). EBSD analyses revealed that microtextures in apatite and merrillite become progressively more complex and deformed with increasing levels of shock‐loading. An early shock‐stage fragmentation at S1 and S2 is followed by subgrain formation from S2 onward, showing consistent decrease in subgrain size with increasing level of deformation (up to S5) and finally granularization of grains caused by recrystallization (S6). Starting with 2°–3° of intragrain crystal‐plastic deformation in both phosphates at the lowest shock stage, apatite undergoes up to 25° and merrillite up to 30° of crystal‐plastic deformation at the highest stage of shock deformation (S5). Merrillite displays lower shock impedance than apatite; hence, it is more deformed at the same level of shock‐loading. We suggest that the microtexture of apatite and merrillite visualized by EBSD can be used to evaluate stages of shock deformation and should be taken into account when interpreting in situ geochemically relevant analyses of the phosphates, e.g., age or volatile content, as it has been shown in other accessory minerals that differently shocked domains can yield significantly different ages.

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“…So far, the effect of deformation structures and dislocation movement on chemical variations at the nanometer scale has been shown only for zircon [11,12] and baddeleyite [38,39]. However, many other minerals may behave similarly.…”

Section: Deformation and Defect Analysismentioning

confidence: 99%

Atomic worlds: Current state and future of atom probe tomography in geoscience

et al. 2018

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Atom Probe Microscopy (APM) is rapidly finding new applications within the geosciences. Historically connected with materials science and semiconductor device applications, recent years have seen an exciting trend as APM has proved a useful tool for nanoscale geochemistry, as it offers unique capabilities when compared with the current suite of conventional geoanalytical techniques. The ability to characterize 3D nanoscale chemistry with isotopic sensitivity, and correlate these results with other analytical techniques, has uncovered intricate details of complex trace element distributions within a variety of minerals and has opened the door to nanoscale isotope geochemistry. Already these advances are having an impact on long-standing questions within geochronology, planetary science and many other fields of research. As this trend gathers pace, we present here a brief summary of the current status of APM geoscience applications and discuss the likely future directions in this developing research space.

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Complex Nanostructures in Shocked, Annealed, and Metamorphosed Baddeleyite Defined by Atom Probe Tomography

Cited by 9 publications

References 85 publications

Atom Probe Tomography: Development and Application to the Geosciences

Atom Probe Tomography: Development and Application to the Geosciences

Shock‐induced microtextures in lunar apatite and merrillite

Atomic worlds: Current state and future of atom probe tomography in geoscience

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