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BP and Oasis Impact Structures, Libya: Remote Sensing and Field Studies

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Impact Tectonics

Part of the book series: Impact Studies ((IMPACTSTUD))

Abstract.

Remote sensing images and recent field studies provide important morphological and structural constraints for the BP and Oasis impact structures in Libya. The BP structure (25°19′ N, 24°20′ E) is highly eroded and appears on satellite images in the form of a set of concentric rings. The rocks are composed of sandstones of the Jurassic to Cretaceous Nubia Formation. The Landsat image allows division of the structure into inner, middle, and outer rings. The ERS1 and Radarsat radar images do not show much detail, but the rings are more pronounced than in the visible wavelengths, probably because the radar penetrates the sand cover. In the field it became obvious that the cited diameter of 2.8 or 3.2 km for the outer ring does not represent the actual crater diameter, as the “middle ring” represents the actual crater rim with a diameter of about 2 km. The middle ring is characterized by a distinct series of hills of up to about 30 m elevation above the surrounding desert, with rocks dipping at 30 to 50° outwards. Some parts of the rim are characterized by intense folding and faulting. The “outer ring” is a discontinuous ring of low hills with 1–2 m average elevation, dipping at 10° inwards. The “inner ring” is interpreted as a small central uplift structure (ca. 500 m in diameter) with steeply upturned strata that are intensely folded, faulted, and — in places — brecciated.

For Oasis (24° 35′ N, 24° 24′ E) diameters of 11.5 km or even 18 km (from radar images) have been suggested in the past. However, the topographically most prominent feature of this structure is a ring of discontinuous (up to 100 m high) hills 5.1 km in diameter. The rocks in this prominent ring dip outward and locally are intensely folded. It can be debated whether or not this feature represents the actual crater rim.

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Author information

Authors and Affiliations

  1. Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria

    Christian Koeberl

  2. Impact Cratering Research Group, School of Geosciences, University of the Witwatersrand, Johannesburg, 2050, South Africa

    Wolf Uwe Reimold

  3. MP3-E163, Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, MD, 20723-6099, USA

    Jeff Plescia

Authors
  1. Christian Koeberl
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  2. Wolf Uwe Reimold
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  3. Jeff Plescia
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Editor information

Editors and Affiliations

  1. Department of Geological Sciences, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria

    Christian Koeberl

  2. Department of Land and Water Resources Engineering, Royal Institute of Technology, 10044, Stockholm, Sweden

    Herbert Henkel

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Koeberl, C., Reimold, W.U., Plescia, J. (2005). BP and Oasis Impact Structures, Libya: Remote Sensing and Field Studies. In: Koeberl, C., Henkel, H. (eds) Impact Tectonics. Impact Studies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27548-7_6

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