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Mineralogy and petrography of Riphean rocks in the Moscow graben
Authors:I M Simanovich
Institution:(1) Geological Institute (GIN), Russian Academy of Sciences, Pyzhevskii per. 7, 109017 Moscow, Russia
Abstract:Based on the study of Upper Precambrian rocks penetrated by the Pavlovskii Posad parametric borehole in the 1770–4780 m interval, the Riphean succession is underlain by quartzose sandstones. The aulacogen within the Moscow Syneclise was covered by sediments accumulated during the intense chemical weathering of a peneplain. Above the 3550 m level, Upper Precambrian rocks comprise arkoses with abundant garnet. The immature (in terms of lithology and mineralogy) arkosic sequence was probably accumulated in grabenshaped structures (aulacogens).
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