Characterization of shocked quartz grains ...
Document type :
Article dans une revue scientifique
DOI :
Permalink :
Title :
Characterization of shocked quartz grains from Chicxulub peak ring granites and shock pressure estimates
Author(s) :
Feignon, Jean‐Guillaume [Auteur]
Department of Lithospheric Research [Wien]
Ferrière, Ludovic [Auteur]
Natural History Museum [Vienna] [NHM]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Koeberl, Christian [Auteur]
Department of Lithospheric Research [Wien]
Department of Lithospheric Research [Wien]
Ferrière, Ludovic [Auteur]
Natural History Museum [Vienna] [NHM]
Leroux, Hugues [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]
Koeberl, Christian [Auteur]
Department of Lithospheric Research [Wien]
Journal title :
Meteoritics and Planetary Science
Abbreviated title :
Meteorit. Planet Sci.
Volume number :
55
Pages :
2206-2223
Publisher :
Wiley
Publication date :
2020-10-02
HAL domain(s) :
Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
English abstract : [en]
Planar deformation features (PDFs) in quartz are a commonly used and well‐documented indicator of shock metamorphism in terrestrial rocks. The measurement of PDF orientations provides constraints on the shock pressure ...
Show more >Planar deformation features (PDFs) in quartz are a commonly used and well‐documented indicator of shock metamorphism in terrestrial rocks. The measurement of PDF orientations provides constraints on the shock pressure experienced by a rock sample. A total of 963 PDF sets were measured in 352 quartz grains in 11 granite samples from the basement of the Chicxulub impact structure’s peak ring (IODP‐ICDP Expedition 364 drill core), with the aim to quantify the shock pressure distribution and a possible decay of the recorded shock pressure with depth, in the attempt to better constrain shock wave propagation and attenuation within a peak ring. The investigated quartz grains are highly shocked (99.8% are shocked), with an average of 2.8 PDF sets per grain; this is significantly higher than in all previously investigated drill cores recovered from Chicxulub and also for most K‐Pg boundary samples (for which shocked quartz data are available). PDF orientations are roughly homogenous from a sample to another sample and mainly parallel to {10urn:x-wiley:10869379:media:maps13570:maps13570-math-00013} and {10urn:x-wiley:10869379:media:maps13570:maps13570-math-00024} orientations (these two orientations representing on average 68.6% of the total), then to {10urn:x-wiley:10869379:media:maps13570:maps13570-math-00032} orientation, known to form at higher shock pressure. Our shock pressure estimates are within a narrow range, between ~16 and 18 GPa, with a slight shock attenuation with increasing depth in the drill core. The relatively high shock pressure estimates, coupled with the rare occurrence of basal PDFs, i.e., parallel to the (0001) orientation, suggest that the granite basement in the peak ring could be one of the sources of the shocked quartz grains found in the most distal K‐Pg boundary sites.Show less >
Show more >Planar deformation features (PDFs) in quartz are a commonly used and well‐documented indicator of shock metamorphism in terrestrial rocks. The measurement of PDF orientations provides constraints on the shock pressure experienced by a rock sample. A total of 963 PDF sets were measured in 352 quartz grains in 11 granite samples from the basement of the Chicxulub impact structure’s peak ring (IODP‐ICDP Expedition 364 drill core), with the aim to quantify the shock pressure distribution and a possible decay of the recorded shock pressure with depth, in the attempt to better constrain shock wave propagation and attenuation within a peak ring. The investigated quartz grains are highly shocked (99.8% are shocked), with an average of 2.8 PDF sets per grain; this is significantly higher than in all previously investigated drill cores recovered from Chicxulub and also for most K‐Pg boundary samples (for which shocked quartz data are available). PDF orientations are roughly homogenous from a sample to another sample and mainly parallel to {10urn:x-wiley:10869379:media:maps13570:maps13570-math-00013} and {10urn:x-wiley:10869379:media:maps13570:maps13570-math-00024} orientations (these two orientations representing on average 68.6% of the total), then to {10urn:x-wiley:10869379:media:maps13570:maps13570-math-00032} orientation, known to form at higher shock pressure. Our shock pressure estimates are within a narrow range, between ~16 and 18 GPa, with a slight shock attenuation with increasing depth in the drill core. The relatively high shock pressure estimates, coupled with the rare occurrence of basal PDFs, i.e., parallel to the (0001) orientation, suggest that the granite basement in the peak ring could be one of the sources of the shocked quartz grains found in the most distal K‐Pg boundary sites.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
INRA
ENSCL
CNRS
INRA
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2021-02-05T11:07:17Z
2021-02-08T13:40:34Z
2021-02-08T13:40:34Z
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