Variable microstructural response of baddeleyite to shock metamorphism in young basaltic shergottite NWA 5298 and improved U–Pb dating of Solar System events

Darling, James; Moser, D. E.; Barker, I.; Tait, K.; Chamberlain, Kevin R.; Schmitt, Axel K.; Hyde, B. C.

doi:10.1016/j.epsl.2016.03.032

Cited by 50 publications

(45 citation statements)

References 39 publications

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“…The interaction volume for diffracted electrons using these parameters is estimated to be a few tens of nanometers in width and depth (Darling et al. ). Diffraction patterns were automatically captured and indexed every 50–200 nm across a manually defined area.…”

Section: Analytical Techniquesmentioning

confidence: 99%

“…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.…”

Section: The Shock-pressure Barometrymentioning

confidence: 99%

“…Merrillite was indexed against a trigonal symmetry (Xie et al 2015), with parameters of a = 10.3444, b = 10.3444, c = 37.0182, a = 90°, b = 90°, c = 120°. The interaction volume for diffracted electrons using these parameters is estimated to be a few tens of nanometers in width and depth (Darling et al 2016). Diffraction patterns were automatically captured and indexed every 50-200 nm across a manually defined area.…”

Section: Electron Backscatter Diffractionmentioning

confidence: 99%

“…The evidence of microstructural changes in response to shock metamorphism of these widely used accessory minerals should be taken into account when interpreting their crystallization ages, as it was shown in other accessory minerals that differently shocked domains can yield significantly different ages (e.g., Erickson et al 2015;Darling et al 2016;. For example, a complex set of phosphate ages measured in Chelyabinsk meteorite could be related to the fact that the phosphates in this meteorite are clearly different in terms of their microtextures, which suggests their nonsynchronous formation or deformation (Walton et al 2018).…”

Section: Accessory Mineral Shock-barometry and Its Implicationsmentioning

confidence: 99%

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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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Section: Analytical Techniquesmentioning

confidence: 99%

Section: The Shock-pressure Barometrymentioning

confidence: 99%

Section: Electron Backscatter Diffractionmentioning

confidence: 99%

Section: Accessory Mineral Shock-barometry and Its Implicationsmentioning

confidence: 99%

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Shock‐induced microtextures in lunar apatite and merrillite

Černok

White

Darling

et al. 2019

Meteorit & Planetary Scien

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“…; Darling et al. ). Effects range from total melting to disrupted crystal lattices, decreasing in intensity with increasing distance from the point of impact (Stöffler ).…”

Section: Introductionmentioning

confidence: 99%

Investigating the shock histories of lunar meteorites Miller Range 090034, 090070, and 090075 using petrography, geochemistry, and micro‐FTIR spectroscopy

Martín

Pernet‐Fisher

Joy

et al. 2017

Meteorit & Planetary Scien

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Abstract-Fourier transform infrared (FTIR) spectroscopy and cathodoluminescence (CL) imaging techniques, combined with electron microprobe analyses, have been used to determine the physical state of feldspathic phases that have been subject to varying levels of shock in the grouped lunar meteorites Miller Range 090034, 090070, and 090075. Six feldspathic phases have been identified based on spectral, textural, and chemical properties. A specific infrared wavelength band ratio (1064/932 cm À1 equivalent to 9.40/10.73 lm), chosen because it can distinguish between some of the feldspathic phases, can be used to estimate the pressure regimes experienced by these phases. In addition, FTIR spatial mapping capabilities allow for visual comparison of variably shocked phases within the samples. By comparing spectral and compositional data, the origin and shock history of this lunar meteorite group has been determined, with each of the shocked feldspathic phases being related to events in its geological evolution. As such, we highlight that FTIR spectroscopy can be easily employed to identify shocked feldspathic phases in lunar samples; estimate peak shock pressures; and when compared with chemical data, can be used to investigate their shock histories.

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Transmission Electron Microscope Imaging Sharpens Geochronological Interpretation of Zircon and Monazite

Seydoux‐Guillaume

Bingen

Bosse

et al. 2017

Microstructural Geochronology

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show abstract

Variable microstructural response of baddeleyite to shock metamorphism in young basaltic shergottite NWA 5298 and improved U–Pb dating of Solar System events

Cited by 50 publications

References 39 publications

Shock‐induced microtextures in lunar apatite and merrillite

Shock‐induced microtextures in lunar apatite and merrillite

Investigating the shock histories of lunar meteorites Miller Range 090034, 090070, and 090075 using petrography, geochemistry, and micro‐FTIR spectroscopy

Transmission Electron Microscope Imaging Sharpens Geochronological Interpretation of Zircon and Monazite

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