Chromferide in impact melt rocks of the El’gygytgyn crater in Chukotka (Russia)
DOI:
https://doi.org/10.15407/dopovidi2019.03.072Keywords:
asteroid, chromferide, contraction ñrack, impact crater, impact melt rockAbstract
The accessory mineralization of chromferide is discovered in impact melt rocks of the El’gygytgyn crater in Chukotka. Impact melt rocks are massive vesicular rocks with a glassy matrix and numerous clasts of shock metamorphosed rocks and minerals of the crater target. Chromferide was crystallized in micronsized contraction cracks and on the inner surface of gas vesicles. The composition of chromferite in the impact melt rocks corresponds to the composition of reference chromferide and is characterized by the formula Fe1.5Cr0.2 or Fe7Cr1. An enrichment of the impact melt rocks of the El’gygytgyn crater in chromium from impacting body was determined earlier. It is supposed that the impactor matter was the main source of chromium in the composition of chromferide.
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