NDLI: Impactite and pseudotachylite from roter kamm crater, namibia

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Impactite and pseudotachylite from roter kamm crater, namibia

Content Provider	NASA Technical Reports Server (NTRS)
Author	Buchanan, P. C. Reid, A. M. Degenhardt Jr., J. J.
Copyright Year	1992
Description	Pseudotachylite is known to occur in a variety of geologic settings including thrust belts (e.g., the Alps and the Himalayas) and impact craters such as Roter Kamm, Namibia. Controversy exists, however, as to whether pseudotachylite can be produced by shock brecciation as well as by tectonic frictional melting. Also open to debate is the question of whether pseudotachylites form by frictional fusion or by cataclasis. It was speculated that the pseudotachylite at Roter Kamm was formed by extensional settling and adjustment of basement blocks during 'late modification stage' of impact. The occurrence of pseudotachylite in association with rocks resembling quenched glass bombs and melt breccias in a relatively young crater of known impact origin offers a rare opportunity to compare features of these materials. Petrographic, x-ray diffraction, and electron microprobe analyses of the impactites and pseudotachylites are being employed to determine the modes of deformation and to assess the role of frictional melting and comminution of adjacent target rocks.
File Size	6679338
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930000942
Archival Resource Key	ark:/13960/t4fn6377h
Language	English
Publisher Date	1992-01-01
Access Restriction	Open
Subject Keyword	Geophysics Impact Melts Meteorite Collisions Petrography Meteorite Craters Namibia Comminution Friction Factor Igneous Rocks Breccia X Ray Diffraction Tectonics Electron Probes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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