Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy

Steven M. Reddy; Arie van Riessen; David W. Saxey; Tim E. Johnson; William D. A. Rickard; Denis Fougerouse; Sebastian Fischer; Ty J. Prosa; Katherine P. Rice; David A. Reinhard; Yimeng Chen; David Olson

doi:10.1016/j.gca.2016.09.019

Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy

Steven M. Reddy, Arie van Riessen, David W. Saxey, Tim E. Johnson, William D. A. Rickard, Denis Fougerouse, Sebastian Fischer, Ty J. Prosa, Katherine P. Rice, David A. Reinhard, Yimeng Chen, David Olson

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Abstract

The widespread use of zircon in geochemical and geochronological studies of crustal rocks is underpinned by an understanding of the processes that may modify its composition. Deformation during tectonic and impact related strain is known to modify zircon trace element compositions, but the mechanisms by which this occurs remain unresolved. Here we combine electron backscatter diffraction, transmission Kikuchi diffraction and atom probe microscopy to investigate trace element migration associated with a ∼20 nm wide, 2° low-angle subgrain boundary formed in zircon during a single, high-strain rate, deformation associated with a bolide impact. The low-angle boundary shows elevated concentrations of both substitutional (Y) and interstitial (Al, Mg & Be) ions. The observed compositional variations reflect a dynamic process associated with the recovery of shock-induced vacancies and dislocations into lower energy low-angle boundaries. Y segregation is linked to the migration and localization of oxygen vacancies, whilst the interstitial ions migrate in association with dislocations. These data represent the direct nanoscale observation of geologically-instantaneous, trace element migration associated with crystal plasticity of zircon and provide a framework for further understanding mass transfer processes in zircon.

Original language	English
Pages (from-to)	158-170
Number of pages	13
Journal	Geochimica et Cosmochimica Acta
Volume	195
Early online date	22 Sept 2016
DOIs	https://doi.org/10.1016/j.gca.2016.09.019
Publication status	Published - 15 Dec 2016

Keywords

Atom probe microscopy
Nanoscale
Zircon
Trace element
Geochemistry
Microstructure
EBSD
Reidite
Impact

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10.1016/j.gca.2016.09.019

Fischer_2016_GCA_AtomProbe_AM
© 2016 Published by Elsevier Ltd. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1016/j.gca.2016.09.019
Accepted author manuscript, 4.64 MB

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Reddy, S. M., Riessen, A. V., Saxey, D. W., Johnson, T. E., Rickard, W. D. A., Fougerouse, D., Fischer, S., Prosa, T. J., Rice, K. P., Reinhard, D. A., Chen, Y., & Olson, D. (2016). Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy. Geochimica et Cosmochimica Acta, 195, 158-170. https://doi.org/10.1016/j.gca.2016.09.019

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title = "Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy",

abstract = "The widespread use of zircon in geochemical and geochronological studies of crustal rocks is underpinned by an understanding of the processes that may modify its composition. Deformation during tectonic and impact related strain is known to modify zircon trace element compositions, but the mechanisms by which this occurs remain unresolved. Here we combine electron backscatter diffraction, transmission Kikuchi diffraction and atom probe microscopy to investigate trace element migration associated with a ∼20 nm wide, 2° low-angle subgrain boundary formed in zircon during a single, high-strain rate, deformation associated with a bolide impact. The low-angle boundary shows elevated concentrations of both substitutional (Y) and interstitial (Al, Mg & Be) ions. The observed compositional variations reflect a dynamic process associated with the recovery of shock-induced vacancies and dislocations into lower energy low-angle boundaries. Y segregation is linked to the migration and localization of oxygen vacancies, whilst the interstitial ions migrate in association with dislocations. These data represent the direct nanoscale observation of geologically-instantaneous, trace element migration associated with crystal plasticity of zircon and provide a framework for further understanding mass transfer processes in zircon.",

keywords = "Atom probe microscopy, Nanoscale, Zircon, Trace element, Geochemistry, Microstructure, EBSD, Reidite, Impact",

author = "Reddy, {Steven M.} and Riessen, {Arie van} and Saxey, {David W.} and Johnson, {Tim E.} and Rickard, {William D. A.} and Denis Fougerouse and Sebastian Fischer and Prosa, {Ty J.} and Rice, {Katherine P.} and Reinhard, {David A.} and Yimeng Chen and David Olson",

note = "The facility is being developed under the auspices of the National Resource Sciences Precinct (NRSP) – a collaboration between CSIRO, Curtin University and The University of Western Australia – and is supported by the Science and Industry Endowment Fund (SIEF RI13-01). SMR acknowledges support from the ARC Core to Crust Fluid System COE (CE11E0070).",

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AU - Reddy, Steven M.

AU - Riessen, Arie van

AU - Saxey, David W.

AU - Johnson, Tim E.

AU - Rickard, William D. A.

AU - Fougerouse, Denis

AU - Fischer, Sebastian

AU - Prosa, Ty J.

AU - Rice, Katherine P.

AU - Reinhard, David A.

AU - Chen, Yimeng

AU - Olson, David

N1 - The facility is being developed under the auspices of the National Resource Sciences Precinct (NRSP) – a collaboration between CSIRO, Curtin University and The University of Western Australia – and is supported by the Science and Industry Endowment Fund (SIEF RI13-01). SMR acknowledges support from the ARC Core to Crust Fluid System COE (CE11E0070).

PY - 2016/12/15

Y1 - 2016/12/15

N2 - The widespread use of zircon in geochemical and geochronological studies of crustal rocks is underpinned by an understanding of the processes that may modify its composition. Deformation during tectonic and impact related strain is known to modify zircon trace element compositions, but the mechanisms by which this occurs remain unresolved. Here we combine electron backscatter diffraction, transmission Kikuchi diffraction and atom probe microscopy to investigate trace element migration associated with a ∼20 nm wide, 2° low-angle subgrain boundary formed in zircon during a single, high-strain rate, deformation associated with a bolide impact. The low-angle boundary shows elevated concentrations of both substitutional (Y) and interstitial (Al, Mg & Be) ions. The observed compositional variations reflect a dynamic process associated with the recovery of shock-induced vacancies and dislocations into lower energy low-angle boundaries. Y segregation is linked to the migration and localization of oxygen vacancies, whilst the interstitial ions migrate in association with dislocations. These data represent the direct nanoscale observation of geologically-instantaneous, trace element migration associated with crystal plasticity of zircon and provide a framework for further understanding mass transfer processes in zircon.

AB - The widespread use of zircon in geochemical and geochronological studies of crustal rocks is underpinned by an understanding of the processes that may modify its composition. Deformation during tectonic and impact related strain is known to modify zircon trace element compositions, but the mechanisms by which this occurs remain unresolved. Here we combine electron backscatter diffraction, transmission Kikuchi diffraction and atom probe microscopy to investigate trace element migration associated with a ∼20 nm wide, 2° low-angle subgrain boundary formed in zircon during a single, high-strain rate, deformation associated with a bolide impact. The low-angle boundary shows elevated concentrations of both substitutional (Y) and interstitial (Al, Mg & Be) ions. The observed compositional variations reflect a dynamic process associated with the recovery of shock-induced vacancies and dislocations into lower energy low-angle boundaries. Y segregation is linked to the migration and localization of oxygen vacancies, whilst the interstitial ions migrate in association with dislocations. These data represent the direct nanoscale observation of geologically-instantaneous, trace element migration associated with crystal plasticity of zircon and provide a framework for further understanding mass transfer processes in zircon.

KW - Atom probe microscopy

KW - Nanoscale

KW - Zircon

KW - Trace element

KW - Geochemistry

KW - Microstructure

KW - EBSD

KW - Reidite

KW - Impact

U2 - 10.1016/j.gca.2016.09.019

DO - 10.1016/j.gca.2016.09.019

M3 - Article

SN - 0016-7037

VL - 195

SP - 158

EP - 170

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

ER -

Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy

Abstract

Keywords

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