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| Titel: |
Geology and age of the Glikson impact structure, Western Australia |
| Auteur: |
Macdonald, F. A. Wingate, M. T. D. Mitchell, K. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 52 (2005) nr. 4-5 pagina's 641-651 |
| Jaar: |
2005 |
| Inhoud: |
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. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 23 gevonden artikelen
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