Abstract
The Glikson structure is an aeromagnetic and structural anomaly located in the Little Sandy Desert of Western Australia (23°59′S, 121°34′E). Shatter cones and planar microstructures in quartz grains are present in a highly deformed central region, suggesting an impact origin. Circumferential shortening folds and chaotically disposed bedding define a 19 km-diameter area of deformation. Glikson is located in the northwestern Officer Basin in otherwise nearly flat-lying sandstone, siltstone and conglomerate of the Neoproterozoic Mundadjini Formation, intruded by dolerite sills. The structure would not have been detected if not for its strong ring-shaped aeromagnetic anomaly, which has a 10 km inner diameter and a 14 km outer diameter. We interpret the circular magnetic signature as the product of truncation and folding of mafic sills into a ring syncline. The sills most likely correlate with dolerites that intrude the Boondawari Formation ∼25 km to the north, for which we report a SHRIMP U-Pb baddeleyite and zircon age of 508 ± 5 Ma, providing a precise older limit for the impact event that formed the Glikson structure.
| Original language | English |
|---|---|
| Pages (from-to) | 641-651 |
| Number of pages | 11 |
| Journal | Australian Journal of Earth Sciences |
| Volume | 52 |
| Issue number | 4-5 |
| DOIs | |
| Publication status | Published - Aug 2005 |
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Geology and age of the Glikson impact structure, Western Australia. / Macdonald, F.A.; Wingate, M. T D; Mitchell, K.
In: Australian Journal of Earth Sciences, Vol. 52, No. 4-5, 08.2005, p. 641-651.Research output: Contribution to journal › Article
TY - JOUR
T1 - Geology and age of the Glikson impact structure, Western Australia
AU - Macdonald, F.A.
AU - Wingate, M. T D
AU - Mitchell, K.
PY - 2005/8
Y1 - 2005/8
N2 - The Glikson structure is an aeromagnetic and structural anomaly located in the Little Sandy Desert of Western Australia (23°59′S, 121°34′E). Shatter cones and planar microstructures in quartz grains are present in a highly deformed central region, suggesting an impact origin. Circumferential shortening folds and chaotically disposed bedding define a 19 km-diameter area of deformation. Glikson is located in the northwestern Officer Basin in otherwise nearly flat-lying sandstone, siltstone and conglomerate of the Neoproterozoic Mundadjini Formation, intruded by dolerite sills. The structure would not have been detected if not for its strong ring-shaped aeromagnetic anomaly, which has a 10 km inner diameter and a 14 km outer diameter. We interpret the circular magnetic signature as the product of truncation and folding of mafic sills into a ring syncline. The sills most likely correlate with dolerites that intrude the Boondawari Formation ∼25 km to the north, for which we report a SHRIMP U-Pb baddeleyite and zircon age of 508 ± 5 Ma, providing a precise older limit for the impact event that formed the Glikson structure.
AB - The Glikson structure is an aeromagnetic and structural anomaly located in the Little Sandy Desert of Western Australia (23°59′S, 121°34′E). Shatter cones and planar microstructures in quartz grains are present in a highly deformed central region, suggesting an impact origin. Circumferential shortening folds and chaotically disposed bedding define a 19 km-diameter area of deformation. Glikson is located in the northwestern Officer Basin in otherwise nearly flat-lying sandstone, siltstone and conglomerate of the Neoproterozoic Mundadjini Formation, intruded by dolerite sills. The structure would not have been detected if not for its strong ring-shaped aeromagnetic anomaly, which has a 10 km inner diameter and a 14 km outer diameter. We interpret the circular magnetic signature as the product of truncation and folding of mafic sills into a ring syncline. The sills most likely correlate with dolerites that intrude the Boondawari Formation ∼25 km to the north, for which we report a SHRIMP U-Pb baddeleyite and zircon age of 508 ± 5 Ma, providing a precise older limit for the impact event that formed the Glikson structure.
KW - Aeromagnetic anomalies
KW - Baddeleyite
KW - Boondawari Formation
KW - Glikson
KW - Impact structures
KW - Kalkarindji Large Igneous Province
KW - Mundadjini Formation
KW - Officer Basin
KW - Planar microstructures
KW - Shatter cones
KW - SHRIMP
KW - Uranium-lead dating
UR - http://www.scopus.com/inward/record.url?scp=27344457136&partnerID=8YFLogxK
U2 - 10.1080/08120090500170419
DO - 10.1080/08120090500170419
M3 - Article
VL - 52
SP - 641
EP - 651
JO - Australian Journal of Earth Sciences
JF - Australian Journal of Earth Sciences
SN - 0812-0099
IS - 4-5
ER -