Other
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1559b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.1559-1560
Other
Scientific paper
The iron meteorite Föllinge, which weighs 400 g, was found in 1932 in the vicinity of Ottsjön, Jämtland, Sweden. It is a pear-to-drop-shaped monolith with partly preserved fusioncrust from the atmospheric flight. A chemical analysis shows 18-2% Ni, 0.64% Co, 2 ppm Ga and 1 ppm Ge, and the structure is composed of 20-50 wide -lamellae in a martensitic matrix. A planimetric analysis of the schreibersite inclusions shows 0.19% P as compared to the chemical result 0.18% P. In analysis and structure Föllinge thus resembles Tazewell, and both are finest octahedrites (Off). Föllinge has, however, due to its small size been thoroughly heat treated in the atmosphere. A thermal gradient could be constructed in two mutually perpendicular sections, showing the 1000°C isotherm. In the centre the temperature just reached 800°C. The original structure is therefore everywhere transformed to martensitic structures due to rapid cooling. A preliminary list of 20 other small iron meteorites which might be expected to show similar response to the atmospheric heat treatment is included. The terrestrial corrosion dissolves selectively the nickel-poor phases, and it is argued that what might be mistaken for entrapped oxides from the atmospheric flight in fact are from a wet terrestrial corrosive attack. A modification of the method for chemical determination of nickel is proposed.
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