Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..827m&link_type=abstract
Lunar and Planetary Science, volume 27, page 827
Physics
2
Joint Surfaces: Multistriated, Pdfs, Shock Metamorphism, Sinamwenda Structure, Zimbabwe
Scientific paper
The Sinamwenda Structure (17 degrees 11'42" S, 27 degrees 47'30"E) is a 220m-diameter postulated impact crater situated in western Zimbabwe. Although the surrounding rocks are flat-lying unjointed Middle Triassic (Karoo) sandstones, the rocks of the crater rim are characterised by steep or overturned bedding, abundant multiply-striated joint surfaces (MSJS), and strong microbrecciation. We show that the MSJS are the result of shock metamorphism of the coarse sandstones in the rim, because of the rare occurrence, on the striated surfaces only, of isolated grains of shocked quartz containing Planar Deformation Features (PDFs). The presence of shocked quartz with PDFs is regarded as proof of the impact origin of the Sinamwenda crater.
Brandt Daniel
Master Sharad
Reimold Wolf Uwe
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