Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1157r&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 157.
Mathematics
Logic
Breccia, Petrography, Structural Properties (Geology), Chemical Composition, Hypervelocity Impact, Meteorite Craters, Sweden, Geochemistry, Geomorphology
Scientific paper
It has been proposed, on the basis of morphological and geophysical observations, that a large, over 300-km-diameter impact structure, termed the Uppland Structure, is centered at approximately 60 deg N, 17 deg E in Central Sweden. To date, no unambiguous geological/mineralogical evidence for the existence of this alleged impact structure has been reported; we embarked on a comprehensive sampling tour of sites that had been described in the literature as extensive breccia occurrences. Detailed petrographic analyses of these breccias allowed some of these to be discarded as being of definite tectonic origin. For others, including some polymict breccias, it has not been possible yet to prove or disprove a tectonic origin. However, none of our samples showed unambiguous evidence of impact diagnostic shock metamorphism. Nevertheless, a series of mafic to intermediate breccias, some of which texturally resemble known impact melt breccias has been identified. These rocks are characterized by a granitoid-derived clast population of crustal origin, and, in part, display rather felsic chemical compositions.
Henkel Hartmut
Reimold Wolf Uwe
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