domingo, 6 de dezembro de 2015

007 e a cratera duvidosa

Quem assistiu 007 Contra Spectre ("Spectre" 2015), viu uma cratera onde fica uma das bases da organização criminosa que só os mais altos iniciados sabem que é controlada por um gato.

Ops! Você terá de morrer.

Mas voltando…

Ela localiza-se em Erfoud, no Marrocos.
“Alighting from the train n the middle of the Moroccan desert, Bond and Madeleine are met by a 1948 Rolls Royce Silver Wraith, which whisks them off to one of those wonderful hidden lairs loved by Bond villains – this hidden inside a ‘meteor crater’.”

“In reality, the impressive formation is an extinct volcanic crater, about 12 miles southwest of Erfoud. Fans of Stephen SommersThe Mummy might recognise it as the site of the lost city ‘Hamunaptra’.”

“believed to be a dormant volcanic crater in the Sahara Desert just outside of the town Erfoud, in the Meknès-Tafilalet of the Maghreb region in eastern Morocco.”

“you may have seen this area and crater in movies such as:
- The Mummy (1999) -> filming location for Hamunaptra
- Prince of Persia (2010) -> where Dastan and Princess Tamina are met by pirates, and Dastan is hit over the head with a bone.”


31.2985000, -4.400800

A cratera é citada como sendo um “vulcão extinto”, embora observando-se suas bordas e formato, pode-se supor rapidamente que trata de uma cratera de impacto, com material que foi um tanto fundido e ganhou resistência, enquanto o material ao retor, mais sedimentar, foi erodido. Os processos e seus mecanismos podem ser entendidos nos diagramas a seguir.

Mas ela realmente trata-se de uma cratera “cone num cone” de um vulcão extinto.
Chapter - Impact Tectonics - Part of the series Impact Studies pp 81-110
Silicified Cone-in-Cone Structures from Erfoud (Morocco): A Comparison with Impact-Generated Shatter Cones

Stefano Lugli, Wolf U. Reimold, Christian Koeberl

“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.”

Resumindo o resumo:

“Várias formações geológicas, incluindo estruturas sedimentares cone-em-cone e marcas de percussão, pode assemelhar-se cones compartilhado gerados por impacto.”
Ref citada em:
G. R. Osinski, E. Pierazzo; Impact Cratering: Processes and Products;

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