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Silicified Cone-in-Cone Structures from Erfoud (Morocco): A Comparison with Impact-Generated Shatter Cones

  • Stefano Lugli
  • Wolf U. Reimold
  • Christian Koeberl
Part of the Impact Studies book series (IMPACTSTUD)

Abstract.

Several geological features, including sedimentary cone-in-cone structures and percussion marks, may resemble impact-generated shatter cones. Especially inexperienced workers may mistake such features for impact deformation. In 1997, our group investigated an alleged occurrence of shatter cones in the Hamada area of southeastern Morocco and found that these are actually cone-in-cone structures, probably from the Lower Visean Merdani Formation. Here, a detailed discussion of cone-in-cone structures, as well as a short review of shatter cone characteristics, is presented in an effort to clarify some distinguishing criteria. Important differences include: (1) Shatter cone striations are of distinctly roundish shape, whereas cone-in-cone striae are step-like; (2) shatter cones never show scaled surfaces; (3) broken cone-in-cone structures invariably produce one surface with striated cone features, but its opposite side would display scaled cone cups; (4) shatter cones do not telescope out of the bedding-plane, as cone-in-cone structures may do; (5) at the thin section scale, the internal structure of cone-in-cone features is well preserved, even after complete silicification of the primary carbonate. Thus, careful observations should allow unambiguous decision whether certain rocks contain shatter cones or cone-in-cone structures.

Keywords

Impact Structure Cone Fracture Explosion Crater Fibrous Calcite Cone Apex 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Stefano Lugli
    • 1
  • Wolf U. Reimold
    • 2
  • Christian Koeberl
    • 3
  1. 1.Dipartimento di Scienze della TerraUniversità degli Studi di Modena e Reggio EmiliaModenaItaly
  2. 2.Impact Cratering Research Group, School of GeosciencesUniversity of the WitwatersrandJohannesburgSouth Africa
  3. 3.Department of Geological SciencesUniversity of ViennaViennaAustria

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