[meteorite-list] Oman crater ?

From: Woreczko Jan & M.Wozniak <ebay_at_meteoritecentral.com>
Date: Sat Sep 16 14:14:37 2006
Message-ID: <009301c6d9bc$8406b930$9301a8c0_at_zeus>

Ha
Thanks ;-)
MWozniak

----- Original Message -----
From: <beda_at_geo.unibe.ch>
To: "Meteorite-list" <ebay_at_biol.uw.edu.pl>
Cc: "meteorite list" <meteorite-list_at_meteoritecentral.com>
Sent: Saturday, September 16, 2006 8:11 PM
Subject: Re: [meteorite-list] Oman crater ?


> This is the so-called Habhab-structure E of Hayma. It has been suggested
that
> this is a meteorite crater some years ago. We have visited the place
during
> meteorite search. Field evidence, together with seismic profiles by the
oil
> industry, showed that it is the surface expression of a salt some.
> Unfortunately. Looks really like a crater at first glance...
>
> Beda Hofmann
>
> Abstract presented at the Meteoritical Society Meeting in M?nster,
Germany,
> 2003:
>
> THE HABHAB STRUCTURE OF CENTRAL OMAN: NOT
> AN IMPACT CRATER. B. A. Hofmann1, E. Gnos, A. Al-
> Kathiri2,3, S.A. Al-Busaidi4, A. Al-Rajhi4, M. Al-Batashi4, J. Terken5
> 1Naturhistorisches Museum der Burgergemeinde Bern, Bernastrasse
> 15, CH-3005 Bern, Switzerland, 2Institut f?r Geologie, Universit?t
> Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland, 3Directorate
> General of Commerce and Industry, Ministry of Commerce and
> Industry, Salalah, Sultanate of Oman, 4Directorate General of Minerals,
> Ministry of Commerce and Industry, Muscat, Sultanate of
> Oman, 5Nederlandse Aardolie Maatschappij (NAM), Assen, The
> Netherlands.
> Introduction: The 6 km near-circular Habhab structure located
> in Central Oman (19? 55'N, 57? 0'E, 75 km E of Hayma) has been
> suggested to represent a possible impact structure based on satellite
> imagery [1-4], an interpretation recently challenged [5]. The structure
> is located on a vast near-flat desert plain made up of shallow
> marine Fars group limestones of middle Miocene age. It consists of
> two concentric, near-circular shallow depressions. We investigated
> the structure on the ground in January 2002, December 2002 and
> January 2003. The discovery of several ordinary chondrites in and
> near the structure motivated us to reinvestigate it's origin. Based on
> the field observations and seismic profiles we conclude that the
> Habhab circular structure is not an impact crater. This conclusion is
> based on the following observations:
> - Undisturbed, bedded Miocene limestone was observed at the rim
> of the structure as well as in its center. No shock effects (brecciation,
> intense fracturing) were observed in the beds or in the abundant
> fossils contained therein.
> - The topographic relief between the different features observed in
> satellite imagery is only a few meters, too little for a crater of young
> age. The flanks of the structure are not uplifted.
> - Absence of any ejecta from stratigraphically deeper strata.
> - Seismic profiles indicate the presence of a salt plug exactly below
> the Habhab circular structure.
> We consider that the Habhab circular structure most likely is caused
> by salt dissolution/salt tectonics related to a near-surface salt plug.
> References: [1] Sharpton et al. (1988) Meteoritics, 23, 301. [2]
> McHone, J.F. and Dietz, R.S. (1988) Meteoritics 23, 288-289. [3]
> Dietz, R.S. et al. (1975) Meteoritics 10, 393, 509. [4] McHone J.F.
> and Greeley, R. (1997) LPSC XXVIII, 915-916. [5] Levell B. et al.
> (2002) GeoArabia 7, 721-730.
>
>
>
> Zitat von Meteorite-list <ebay_at_biol.uw.edu.pl>:
>
> > Ha
> > Whether it is meteoritic crater?
> > GoogleEarth -> 19o55'54" N 56o57'27" E
> > Best regards
> > Jan Woreczko
> > http://www.woreczko.pl/meteorites/news/Oman_crater.jpg
> >
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>
>
>
>
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Received on Sat 16 Sep 2006 02:18:31 PM PDT