Mathematics – Logic
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p22a..04p&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P22A-04
Mathematics
Logic
3672 Planetary Mineralogy And Petrology (5410), 5420 Impact Phenomena (Includes Cratering)
Scientific paper
The circular Vargeão structure, approximately 12 km in diameter, lies in western Santa Catarina state, Brazil. The structure is characterized by a central domed uplift of shocked and brecciated late Paleozoic/Mesozoic quartzose sediments, surrounded by brecciated basaltic flows of the early Cretaceous Serra Geral Formation within the Paran á Basin. Structural aspects of possible impact origin include radial and annular fracture patterns with apparent vertical slickenlines. Distinct mesoscale shock features (ie. especially an ejecta blanket and impact melt) are absent, presumably due to erosion, but their absence has promoted the consideration of alternative geologic origins. Qualitative and quantitative documentation of petrofabric shock features are presented that are consistent only with a meteorite impact origin. Four distinct orientations of planar deformation features in quartz and shock features in plagioclase along with secondary zeolitization will be described. Detailed studies of unit cell dimensions emphasizing shocked quartz are underway. The Vargeão impact structure is one of few known terrestrial impacts in basalt target rocks; comparisons with the other terrestrial impacts in basaltic target rocks will be presented.
Francolin J. B.
MacDonald William D.
Poulos C. M.
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