Comment on “John’s stone: A possible fragment of the 1908 Tunguska meteorite” (Anfinogenov et al., 2014, Icarus 243, 139–147)

Haack, H.; Greenwood, Richard C.; Busemann, H.

doi:10.1016/j.icarus.2015.09.018

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…The boulder, formed by sandstone (or conglomerate), as well as its fragments collected in soil, was partly coated with thin glass. The authors [33] calculated that the stone had to hit the ground with a velocity higher than 500 m/s (they suggested that it could represent a new type of meteorite, which however is inconsistent with its chemical and isotopic composition [34]). Therefore, that stone may represent a secondary projectile.…”

Section: Disequilibrium Character Of Melting and Evaporation And Its ...mentioning

confidence: 99%

Comparison of Melting-Affected Rocks from Presumed Small Impact Craters and Old Limekilns in Bavaria, Germany

Procházka,

Herrmann,

Kalenda

et al. 2024

Preprint

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Depressions containing partially molten rocks were investigated in Quaternary pebbly sedi-ments in Alpine foreland in Bavaria, Germany. Ruins of limekilns from 18-19th centuries are abundant around Seeshaupt. They are usually associated with earthworks for fuel feeding and protection from wind. Depressions contain partially molten stones from furnace walls, with lime and burnt loam remnants. On the surface of pebbles (typically gneisses), green glass formed with chemical composition possibly affected by moderately volatile components of wood biomass, mainly K and Cu. Thermoplastic deformation of pebbles is limited and the sur-face melt deformation points to slow flow. At Emmerting, on the other hand, two walled circu-lar depressions which lack additional earthworks have been identified as possible impact cra-ters. Thermally affected pebbles show much more intense deformation. Colorless to greenish glass, also K and Cu enriched, usually forms only thin surface coatings, in places covered by younger melt extruded from pebble interior. Burnt loam is missing. At Grabenstätt-Kaltenbach, a depression of unclear origin was investigated. Morphologically, it matches craters rather than limekilns, but anthropogenic contamination (brick-like material) is probable. The rare molten samples do not display extreme deformation features. The thermally affected stones, mainly those from Emmerting, have elevated magnetic susceptibility.

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Section: Disequilibrium Character Of Melting and Evaporation And Its ...mentioning

confidence: 99%

Comparison of Melting-Affected Rocks from Presumed Small Impact Craters and Old Limekilns in Bavaria, Germany

Procházka,

Herrmann,

Kalenda

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Challenges of identifying putative planetary-origin meteorites of non-igneous material

Anfinogenova

Anfinogenov

2019

Geoscience Frontiers

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Comment on “John’s stone: A possible fragment of the 1908 Tunguska meteorite” (Anfinogenov et al., 2014, Icarus 243, 139–147)

Cited by 2 publications

References 28 publications

Comparison of Melting-Affected Rocks from Presumed Small Impact Craters and Old Limekilns in Bavaria, Germany

Comparison of Melting-Affected Rocks from Presumed Small Impact Craters and Old Limekilns in Bavaria, Germany

Challenges of identifying putative planetary-origin meteorites of non-igneous material

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