Shocked quartz in polymict impact breccia from the Upper Cretaceous Yallalie impact structure in Western Australia

2019 ◽  
Vol 54 (3) ◽  
pp. 621-637 ◽  
Author(s):  
Morgan A. Cox ◽  
Aaron J. Cavosie ◽  
Ludovic Ferrière ◽  
Nicholas E. Timms ◽  
Phil A. Bland ◽  
...  
Keyword(s):  
Western Australia ◽  
Upper Cretaceous ◽  
Impact Structure ◽  
Shocked Quartz

Clay mineralogical, geochemical and isotopic tracing of the evolution of the Woodleigh impact structure, Southern Carnarvon Basin, Western Australia

2005 ◽  
Vol 149 (5) ◽  
pp. 576-590 ◽  
Author(s):  
I. Tonguç Uysal ◽  
Arthur J. Mory ◽  
Suzanne D. Golding ◽  
Robert Bolhar ◽  
Kenneth D. Collerson
Keyword(s):  
Western Australia ◽  
Impact Structure ◽  
Isotopic Tracing ◽  
Carnarvon Basin

3D Seismic Interpretation of the Praia Grande Impact Structure – Upper Cretaceous of Santos Basin, Offshore Brazil

2005 ◽  
Author(s):  
Gustavo Alberto Correia ◽  
Jorge Rui Corrêa de Menezes ◽  
Gilmar Vital Bueno ◽  
Edmundo Julio Jung Marques
Keyword(s):  
Upper Cretaceous ◽  
Seismic Interpretation ◽  
Impact Structure ◽  
3D Seismic

scholarly journals Precise radiometric age establishes Yarrabubba, Western Australia, as Earth’s oldest recognised meteorite impact structure

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Timmons M. Erickson ◽  
Christopher L. Kirkland ◽  
Nicholas E. Timms ◽  
Aaron J. Cavosie ◽  
Thomas M. Davison
Keyword(s):  
Western Australia ◽  
Impact Structure ◽  
Meteorite Impact

Shocked quartz grains from the Målingen structure, Sweden-Evidence for a twin crater of the Lockne impact structure

2014 ◽  
Vol 49 (6) ◽  
pp. 1076-1082 ◽  
Author(s):  
C. Alwmark ◽  
S. Alwmark-Holm ◽  
J. Ormö ◽  
E. Sturkell
Keyword(s):  
Impact Structure ◽  
Shocked Quartz ◽  
Quartz Grains

Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia

2003 ◽  
Vol 213 (3-4) ◽  
pp. 235-247 ◽  
Author(s):  
Francis A. Macdonald ◽  
John A. Bunting ◽  
Sara E. Cina
Keyword(s):  
Western Australia ◽  
Impact Structure ◽  
Yilgarn Craton

Shock deformation microstructures in xenotime from the Spider impact structure, Western Australia

2021 ◽  
Author(s):  
Morgan A. Cox ◽  
Aaron J. Cavosie ◽  
Michael Poelchau ◽  
Thomas Kenkmann ◽  
Phil A. Bland ◽  
...  
Keyword(s):  
Western Australia ◽  
Impact Structure ◽  
High Angle ◽  
Deformation Bands ◽  
Stress Regime ◽  
Shock Deformation ◽  
Deformation Twins ◽  
Formation Conditions ◽  
Shatter Cones ◽  
Micro Structures

ABSTRACT The rare earth element–bearing phosphate xenotime (YPO4) is isostructural with zircon, and therefore it has been predicted that xenotime forms similar shock deformation microstructures. However, systematic characterization of the range of micro structures that form in xenotime has not been conducted previously. Here, we report a study of 25 xenotime grains from 10 shatter cones in silicified sandstone from the Spider impact structure in Western Australia. We used electron backscatter diffrac tion (EBSD) in order to characterize deformation and microstructures within xenotime. The studied grains preserve multiple sets of planar fractures, lamellar {112} deformation twins, high-angle planar deformation bands (PDBs), partially recrystallized domains, and pre-impact polycrystalline grains. Pressure estimates from micro structures in coexisting minerals (quartz and zircon) allow some broad empirical constraints on formation conditions of ~10–20 GPa to be placed on the observed microstructures in xenotime; at present, more precise formation conditions are unavailable due to the absence of experimental constraints. Results from this study indicate that the most promising microstructures in xenotime for recording shock deformation are lamellar {112} twins, polycrystalline grains, and high-angle PDBs. The {112} deformation twins in xenotime are likely to be a diagnostic shock indicator, but they may require a different stress regime than that of {112} twinning in zircon. Likewise, polycrystalline grains are suggestive of impact-induced thermal recrystallization; however, in contrast to zircon, the impact-generated polycrystalline xenotime grains here appear to have formed in the solid state, and, in some cases, they may be difficult to distinguish from diagenetic xenotime with broadly similar textures.

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