Sedimentation regime in distensible basins. Ayabaca limestones during the upper cretaceous (Ilave, Acora, Ayabaca, Mazo Cruz areas) located in southern Peru
DOI:
https://doi.org/10.15381/iigeo.v7i14.731Keywords:
Stratigraphy, Tectonics, Cretaceous, Distensional BasinsAbstract
Inside the Cretaceous stratigraphy of the Peruvian South Highlands, two clastic sequences can be distinguished, an inferior siliciclastic denominated Angostura Formation and a superior one, those ordered inside the Vilquechico and Muñani formations. These sequences are separated by a conspicuous carbonated level «Ayabacas Formation», which has the particularity of being presented in two ways: (a) a non-deformed, bed-growing, carbonated level, and (b) a level presenting an intense deformation, essentially made up of blocks of carbonates, where it is possible to distinguish both sandstone blocks and/or clasts, i.e. extraclasts. This particularity of this carbonated level had its origin in a distensional tectonics which favoured the olistrostomic character of these limestones.
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Copyright (c) 2004 Y. J. Sánchez, M. A. Lagos, H. J. Jacay, B. C. Chacaltana
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