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• W966956306 abstract "The basic and common features of impact-generated hydrothermal systems are considered, based on studies of the hydrothermal mineralization in large Russian impact structures — Popigai (diameter: 100 km), Kara (65 km), and Puchezh-Katunki (80 km). The dominant hydrothermal assemblages at all craters are clay minerals (smectites, chlorites, and mixed-layered smectites-chlorites), various zeolites, calcite, and pyrite; in addition, cristobalite, quartz, opal, anhydrite, gypsum, apophyllite, prehnite, epidote, andradite, ferrosalite, actinolite, and albite occur locally. In Puchezh-Katunki, the abundant hydrothermal mineralization within the central uplift area shows a distinct vertical distribution due to thermal gradients: an upper smectite-zeolite zone and a lower chlorite-anhydrite zone can be distinguished. In Kara and Popigai, where the hydrothermal alteration affected mainly the impact melt rocks filling the craters, a vertical zonation of clay minerals is only outlined, whereas the distribution of other minerals mainly results from different host lithologies. The mineral assemblages indicate post-impact hydrothermal alteration at temperatures of 50–350°C, pH of 6–8, and Eh > −0.5. The AlIV content in clay minerals and zeolites decreases from the base to the top of thick impact rock sequences, indicating the decrease of temperature and pH of the mineral-forming solutions. The composition of the hydrothermal mineralization in impact craters is determined by the target composition and by the occurrence of large amounts of shock-derived aluminosilicate materials, which result in alkaline properties and higher silica activities in the solutions.KeywordsClay MineralHydrothermal AlterationImpact CraterVertical ZonationImpact StructureThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
• W966956306 created "2016-06-24" @default.
• W966956306 creator A5076493459 @default.
• W966956306 date "2002-01-01" @default.
• W966956306 modified "2023-10-10" @default.
• W966956306 title "Impact-Generated Hydrothermal Systems: Data from Popigai, Kara, and Puchezh-Katunki Impact Structures" @default.
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• W966956306 doi "https://doi.org/10.1007/978-3-662-05010-1_6" @default.
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