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Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Uniform regional manifestations of the post-impact hydrothermal activity in the Czech crater

Petr Rajlich

Geoscience Research Reports 40, 2007 (GRR for 2006), pages 30–33

Keywords: Bohemian Massif, ilmenite, kyanite, sillimanite, andalusite, geyzirite, anthophyllite, impact, hydrothermal activity

Full text (PDF, 0.52 MB)

Abstract

The occurrence of ilmenite coatings, kyanite + sillimanite mineral lineations and andalusite on shocked quartz pods, together with the anthophyllite reaction rims on the numerous serpentinite fragments and silicious geyzirites in the former crater fill in the Bohemian Massif astrobleme points to an important hydrothermal activity. It postdated the probable Lower Proterozoic impact (2000 Ma) and occurred in the latest stage of the transitional cavity collapse and subsided for longer time in the sediments (Proterozoic) deposited in the crater cavity.