Abstract
Postsedimentation alteration and structural assemblies of the Triassic sedimentary complexes of West Chukotka are discussed. Zoning of the alteration is based on examination of newly formed structural and mineral assemblages, the chemical composition, and the polytypes of clay minerals. Three zones of postsedimentation transformation of sandstones are distinguished: (1) the zone of chlorite, illite, and mixed-layer disordered chlorite-smectite; (2) the zone of illite and chlorite; and (3) the zone of phengite and ferroan chlorite. The grade of postsedimentation transformation and the composition of the newly formed micas are correlated with the cleavage type. The development of two-three types of cleavage leads to the highest degree of rock transformation. The assemblages of clay minerals and the crystal chemistry of the authigenic phengite show that the grade of postsedimentation transformation of the Triassic rocks attains the stage of greenschistfacies metamorphism in the zone of development of two cleavage types. Where the second cleavage is not documented or poorly developed, the rocks remain unmetamorphosed. Evidence is given that postsedimentation transformation of terrigenous rocks in the foldbelt is controlled largely by deformation.
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Original Russian Text © M.I. Tuchkova, S.M. Katkov, I.O. Galuskina, I.M. Simanovich, 2011, published in Geotektonika, 2011, Vol. 45, No. 3, pp. 64–78.
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Tuchkova, M.I., Katkov, S.M., Galuskina, I.O. et al. Postsedimentation transformation of triassic terrigenous rocks in West Chukotka as an indicator of folding conditions. Geotecton. 45, 225–239 (2011). https://doi.org/10.1134/S0016852111030083
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DOI: https://doi.org/10.1134/S0016852111030083