Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216..111k&link_type=abstract
Tectonophysics, Vol. 216, No. 1/2, p. 111 - 122
Physics
10
Scientific paper
Petrophysical and drill hole logging data on a 218 m deep diamond drill hole drilled in 1989 in the Lappajärvi meteorite crater, Finland, are presented. The authors studied density, porosity, magnetic susceptibility, natural remanent magnetization, electric resistivity, hydraulic conductivity, P wave velocity, and fracture frequency. The meteorite impact which created the Lappajärvi crater produced a series of rocks which differ significantly from the unshocked Precambrian bedrock in the surroundings. Kärnäites (impact melt), suevites and impact breccias are characterized by increased total and effective porosity. The porosity is responsible for low resistivity, low bulk density, low P wave velocity and high hydraulic conductivity. Magnetic mineralogy was also strongly modified and in kärnäites the main magnetic minerals are pyrrhotite and nickel-bearing native iron.
Kivekas Liisa
Kukkonen Ilmo. T.
Paananen M.
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