Mathematics – Logic
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33....7k&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 1, pages 7-12.
Mathematics
Logic
3
Scientific paper
Mineralogical, petrographical and chemical determinations were made for 743 agate (banded variety of chalcedonic quartz) nodules (diameters from 5 mm to 5 cm) formed during post-impact, low-temperature hydrothermal activity as vesicle fillings in the melt rocks of the Saaksjarvi meteorite impact structure (diameter 5 km) in SW-Finland. Other hydrothermal vesicle fillings in the impact melt rocks include chlorite, mordenite, smectite and kaolinite. The agates were classified into two types, whose mineralogical properties and chemical compositions fall within the range of volcanic agates (basaltic and rhyolitic host rocks). The relatively high age (about 510 Ma) of the Saaksjarvi impact melt rocks, however, is reflected by the presence of recrystallization textures, which are rare in younger volcanic agates. The Saaksjarvi structure was initially located after following the fortuitous discovery of agate "path-finders" in the glacial overburden. It is recommended that wherever volcanic type agates are found as float in Precambrian shield areas devoid of younger volcanic rocks, the possible presence of impact (or volcanic) craters in the vicinity should be considered.
Kinnunen Kari A.
Lindqvist Kristian
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