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The Weaubleau impact structure "round rocks" ("Missouri rock balls", "Weaubleau eggs"): possible analogues in the Spanish Azuara/Rubielos de la Cérida impact structures

  • July 2013
Authors:
Kord Ernstson at University of Wuerzburg
Kord Ernstson
Ferran Maria Claudin Botines
Ferran Maria Claudin Botines
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Abstract and Figures

The "round rocks" of the Weaubleau-Osceola impact structure have phenomenological counterparts in the Spanish Azuara/Rubielos de la Cérida impact structures where they occur within voluminous heavily brecciated rock units. Related nodular bodies within large monomictic movement breccias are observed also in the Ries impact structure. A process similar to the formation of monomictic impact breccias with rounded clasts as part of a mortar texture is suggested. A relation to the Weaubleau-Osceola "round rocks" may exist but not necessarily.
Fig.$1.$Weaubleau$"round$rock".$The$typical$and$most$common$size$runs$from$golfDballs$to$grapefruit.$ Photo:$Harmil,$WIKIMEDIA$COMMONS.$ $
Fig.$1.$Weaubleau$"round$rock".$The$typical$and$most$common$size$runs$from$golfDballs$to$grapefruit.$ Photo:$Harmil,$WIKIMEDIA$COMMONS.$ $
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Figures - uploaded by Kord Ernstson
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All figure content in this area was uploaded by Kord Ernstson
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Content uploaded by Kord Ernstson
Author content
All content in this area was uploaded by Kord Ernstson on Dec 31, 2013
Content may be subject to copyright.
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"Earth's Impact Events Through Geologic Times": Comment on Schmieder & Kring article in Astrobiology
Article
Full-text available
  • Jan 2021
We use Schmieder and Kring's article to show how science still works within the so-called "impact community" and how scienti c data are manipulated and "rubber-stamped" by reviewers (here, e.g., C. Koeberl and G. Osinski). We accuse the authors of continuing to list the Azuara and Rubielos de la Cérida impact structures and one of the world's most prominent ejecta occurrences of the Pelarda Fm. in Spain 1 2 as non-existent in the compilation. The same applies to the spectacular Chiemgau impact in Germany, which has been proven by all impact criteria for several years. For the authors' dating list, we propose that the multiple impact of Azuara is included together with the crater chain of the Rubielos de la Cérida impact basin as a dated candidate for the third, so far undated impact markers in the Massignano outcrop in Italy.
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The mid-Tertiary Azuara and Rubielos de la Cérida paired impact structures (Spain)
Article
Full-text available
  • Dec 2002
We report on the Azuara impact structure and its Rubielos de la Cérida compa- nion crater, which establish the largest terrestrial doublet impact structure presently known. Both structures have diameters of roughly 35 - 40 km and they have been formed in a purely sedimentary target. From stratigraphic considerations and palaeontologic dating, an Upper Eocene or Oligocene age is very probable Geological mapping has established abundant geologic impact evidence in the form of monomictic and polymictic breccias and breccia dikes, megabreccias, dislocated megablocks, remarkable structural features, extensive impact ejecta and impact sig- natures even in distant autochthonous deposits. The most striking impact evidence for both structures is given by strong shock metamorphism, including melt and dia- plectic glass, planar deformation features (PDFs), different kinds of impact melt rocks (from former silicate melt, carbonate melt, carbonate-phosphate melt) and suevite breccias. Glassy amorphous carbon particles in a solid C-O compound may be related with fullerenes and may originate from a quenched melt of extremely shocked coal or from extremely shocked limestones. It is assumed that the impact had considerable influence on the Mid-Tertiary regional geology of the Iberian System, and we suggest that respective geologic models which have so far not con- sidered this peculiar and far-reaching event, need considerable revision.
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Evidence of an impact origin for the Azuara structure (Spain)
Article
Some 50 km south of Zaragoza (northeast Spain) there is a tectonically peculiar area, which is suspected to be a large impact site. It has a morphologically conspicuous ring structure with a diameter of roughly 30 km and consists mainly of Mesozoic sediments emerging from the Ebro Tertiary Basin, and partly of Palaeozoic rocks from the Iberian System. The strata of the ring, in general, dip to the center and are highly folded and faulted. Intense and unusual deformation is indicated by abundant mixed and monomict breccias. A single poorly exposed outcrop of a mixed breccia with sedimentary fragments exhibits shock-metamorphic effects. Within quartz grains, systems of crystallographically oriented microscopic planar features and planar fractures can be observed, as well as kink bands in micas within the breccia matrix. The age of the impact is estimated to be between Lower Cretaceous and Miocene.
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