„Veevers-Krater“ – Versionsunterschied
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'''Veevers crater''' is a [[meteorite]] [[impact crater]] located at latitude 22° 58' 06" S and longitude 125° 22' 07" E on a flat desert plain between the [[Great Sandy Desert|Great Sandy]] and [[Gibson Desert|Gibson Deserts]] in the center of the state of [[Western Australia]], [[Australia]]. The site is very remote and difficult to visit. The crater was discovered in July 1975 during a government geological survey and named in honor of Australian geologist J.J. Veevers who had worked in the area in the late 1950s<ref name="y76">{{cite journal | author=Yeates AN, Crowe, RWA, Towner RR | title=The Veevers crater; a possible meteoritic feature | journal=BMR Journal of Australian Geology & Geophysics | volume=1 | issue= | year=1976 | pages=77-8 | id=}}<br/></ref>. At the time of discovery a meteorite impact origin was suspected, but could not be proven. The subsequent discovery of [[iron meteorite]] fragments around the crater by [[Eugene Merle Shoemaker|E.M.]] and [[Carolyn S. Shoemaker|C.S. Shoemaker]] in 1984<ref name="ss85">{{cite journal | author=Shoemaker EM, Shoemaker CS | title=Impact structures of Western Australia | journal=Meteoritics | volume=20 | issue= | year=1985 | pages=754 -6 | }} [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1985Metic..20R.754S&db_key=AST&data_type=HTML&format=&high=457bf7462f06111 PDF]<br/></ref> removed any doubt about its origin.<br /> |
'''Veevers crater''' is a [[meteorite]] [[impact crater]] located at latitude 22° 58' 06" S and longitude 125° 22' 07" E on a flat desert plain between the [[Great Sandy Desert|Great Sandy]] and [[Gibson Desert|Gibson Deserts]] in the center of the state of [[Western Australia]], [[Australia]]. The site is very remote and difficult to visit. The crater was discovered in July 1975 during a government geological survey and named in honor of Australian geologist J.J. Veevers who had worked in the area in the late 1950s<ref name="y76">{{cite journal | author=Yeates AN, Crowe, RWA, Towner RR | title=The Veevers crater; a possible meteoritic feature | journal=BMR Journal of Australian Geology & Geophysics | volume=1 | issue= | year=1976 | pages=77-8 | id=}}<br/></ref>. At the time of discovery a meteorite impact origin was suspected, but could not be proven. The subsequent discovery of [[iron meteorite]] fragments around the crater by [[Eugene Merle Shoemaker|E.M.]] and [[Carolyn S. Shoemaker|C.S. Shoemaker]] in 1984<ref name="ss85">{{cite journal | author=Shoemaker EM, Shoemaker CS | title=Impact structures of Western Australia | journal=Meteoritics | volume=20 | issue= | year=1985 | pages=754 -6 | }} [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1985Metic..20R.754S&db_key=AST&data_type=HTML&format=&high=457bf7462f06111 PDF]<br/></ref> removed any doubt about its origin.<br /> |
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The crater has a symmetrical bowl-shaped topography and is considered to be one of the best preserved small meteorite craters on Earth<ref name="sms05">{{cite journal | author=Shoemaker EM, Macdonald FA, Shoemaker CS | title=Geology of five small Australian impact craters | journal=Australian Journal of Earth Sciences | volume=52 | issue= | year=2005 | pages=529–44 | }} [http://journalsonline.tandf.co.uk/link.asp?id=t2n7222127867711 Abstract]<br/></ref>. The 20 m wide rim rises about 1.5 m above the plain, while the deepest point of the central depression is 7 m below the rim crest; the rim to rim diameter averages about 70 m<ref name="y76"><br/></ref><ref name="sms05"><br/></ref>. Based on cosmogenic [[nuclide]] exposure dating of the crater walls, the crater is less than 20 thousand years old, while the pristine state of preservation of the [[ejecta]] has been used to suggest that it may in fact be less than 4 thousand years old<ref name="sms05"><br/></ref>.<br /> |
The crater has a symmetrical bowl-shaped topography and is considered to be one of the best preserved small meteorite craters on Earth<ref name="sms05">{{cite journal | author=Shoemaker EM, Macdonald FA, Shoemaker CS | title=Geology of five small Australian impact craters | journal=Australian Journal of Earth Sciences | volume=52 | issue= | year=2005 | pages=529–44 | | doi=10.1080/08120090500180921}} [http://journalsonline.tandf.co.uk/link.asp?id=t2n7222127867711 Abstract]<br/></ref>. The 20 m wide rim rises about 1.5 m above the plain, while the deepest point of the central depression is 7 m below the rim crest; the rim to rim diameter averages about 70 m<ref name="y76"><br/></ref><ref name="sms05"><br/></ref>. Based on cosmogenic [[nuclide]] exposure dating of the crater walls, the crater is less than 20 thousand years old, while the pristine state of preservation of the [[ejecta]] has been used to suggest that it may in fact be less than 4 thousand years old<ref name="sms05"><br/></ref>.<br /> |
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The [[iron meteorite]] fragments collected around the crater are classified as a coarse [[octahedrite]] belonging to chemical class [[IIAB]]; the fragments show considerable evidence of deformation presumably related to the impact explosion<ref name="b96">{{cite journal | author=Bevan AWR | title=Australian crater-forming meteorites | journal=AGSO Journal of Australian Geology & Geophysics | volume=16 | issue= | year=1996 | pages=421–9 | id=}} <br/></ref>. It has been inferred that the original meteorite was in the size range of 100-1000 tonnes, probably closer to the latter, now dispersed as fragments within the crater filling [[breccia]] and ejecta<ref name="sms05"><br/></ref>. |
The [[iron meteorite]] fragments collected around the crater are classified as a coarse [[octahedrite]] belonging to chemical class [[IIAB]]; the fragments show considerable evidence of deformation presumably related to the impact explosion<ref name="b96">{{cite journal | author=Bevan AWR | title=Australian crater-forming meteorites | journal=AGSO Journal of Australian Geology & Geophysics | volume=16 | issue= | year=1996 | pages=421–9 | id=}} <br/></ref>. It has been inferred that the original meteorite was in the size range of 100-1000 tonnes, probably closer to the latter, now dispersed as fragments within the crater filling [[breccia]] and ejecta<ref name="sms05"><br/></ref>. |
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Version vom 3. Mai 2008, 19:34 Uhr
Veevers crater is a meteorite impact crater located at latitude 22° 58' 06" S and longitude 125° 22' 07" E on a flat desert plain between the Great Sandy and Gibson Deserts in the center of the state of Western Australia, Australia. The site is very remote and difficult to visit. The crater was discovered in July 1975 during a government geological survey and named in honor of Australian geologist J.J. Veevers who had worked in the area in the late 1950s[1]. At the time of discovery a meteorite impact origin was suspected, but could not be proven. The subsequent discovery of iron meteorite fragments around the crater by E.M. and C.S. Shoemaker in 1984[2] removed any doubt about its origin.
The crater has a symmetrical bowl-shaped topography and is considered to be one of the best preserved small meteorite craters on Earth[3]. The 20 m wide rim rises about 1.5 m above the plain, while the deepest point of the central depression is 7 m below the rim crest; the rim to rim diameter averages about 70 m[1][3]. Based on cosmogenic nuclide exposure dating of the crater walls, the crater is less than 20 thousand years old, while the pristine state of preservation of the ejecta has been used to suggest that it may in fact be less than 4 thousand years old[3].
The iron meteorite fragments collected around the crater are classified as a coarse octahedrite belonging to chemical class IIAB; the fragments show considerable evidence of deformation presumably related to the impact explosion[4]. It has been inferred that the original meteorite was in the size range of 100-1000 tonnes, probably closer to the latter, now dispersed as fragments within the crater filling breccia and ejecta[3].
References
- ↑ a b Yeates AN, Crowe, RWA, Towner RR: The Veevers crater; a possible meteoritic feature. In: BMR Journal of Australian Geology & Geophysics. 1. Jahrgang, 1976, S. 77-8.
Referenzfehler: Ungültiges<ref>-Tag. Der Name „y76“ wurde mehrere Male mit einem unterschiedlichen Inhalt definiert. - ↑ Shoemaker EM, Shoemaker CS: Impact structures of Western Australia. In: Meteoritics. 20. Jahrgang, 1985, S. 754 -6. PDF
- ↑ a b c d Shoemaker EM, Macdonald FA, Shoemaker CS: Geology of five small Australian impact craters. In: Australian Journal of Earth Sciences. 52. Jahrgang, 2005, S. 529–44, doi:10.1080/08120090500180921. Abstract
Referenzfehler: Ungültiges<ref>-Tag. Der Name „sms05“ wurde mehrere Male mit einem unterschiedlichen Inhalt definiert. - ↑ Bevan AWR: Australian crater-forming meteorites. In: AGSO Journal of Australian Geology & Geophysics. 16. Jahrgang, 1996, S. 421–9.