- Glikson crater
Glikson crater is an
impact structure (orastrobleme ), the eroded remnant of a formerimpact crater , situated in theLittle Sandy Desert of centralWestern Australia . A possible impact structure was first reported in 1997, and named after Australian geologist A. Y. Glikson, attention to the site being drawn by the presence of a prominent 14 km diameter ring-shaped aeromagnetic anomalycite journal | author=Shoemaker EM, Shoemaker CS | title=Glikson, a probable impact structure, Western Australia | journal=Lunar and Planetary Science Conference | volume=XXVIII | issue=Part 3 | year=1997 | pages=1309–131; abstract 1669 | id= [http://www.lpi.usra.edu/meetings/lpsc97/pdf/1669.PDF Conference abstract] ] . The area within the ring contains sparse outcrop of uplifted and deformedNeoproterozoic sandstone , but is largely covered by sand dunes. The recent discovery of shatter cones and microscopic shock effects is reliable evidence for an impact origincite journal | author=Macdonald FA, Wingate MTD, Mitchell K | title=Geology and age of the Glikson impact structure, Western Australia | journal=Australian Journal of Earth Sciences | volume=52 | issue= | year=2005 | pages=641–651 | id= | doi=10.1080/08120090500170419 [http://journalsonline.tandf.co.uk/link.asp?id=ntw8160g42697p35 Abstract] ] . Deformation of the sandstone consistent with an impact origin extends out to a diameter of 19 km, which is the best estimate for the original diameter of the original crater. The ring-shaped aeromagnetic anomaly was probably caused by disruption of a horizontal layer of magneticigneous rock , known as a sill, by the impact event. Nearby outcrops ofdolerite have been dated at 508 ± 5 Ma (MiddleCambrian ), and if this is the same rock causing the aeromagnetic anomaly, then the impact must be younger, probably ofPaleozoic age ] .References
External links
* [http://www.unb.ca/passc/ImpactDatabase/images/Glikson.html Glikson at Earth Impact Database]
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