Post-Cretaceous brittle tectonics in the Tunas Alkaline Complex, Paraná, Brazil
نویسندگان
چکیده
We present a study of the brittle tectonics Tunas Alkaline Complex focusing on kinematic and geometric analysis faults shear zones deforming complex. The data acquired respective interpretations sought to contribute post-Cretaceous tectonic structural models southern Brazil. ~83 Ma-old alkaline complex is made up syenites, alkali plutonic volcanic breccias, as well trachyte, microsyenite, bostonite dykes. Morphostructural using remote sensing combined with right dihedral fault-slip relations intersections among structures allowed us characterize four Cenozoic paleostress fields their pulses: (I) Eocene-Oligocene NW-SE extension responsible for normal oblique-slip striking N60-70E; (II) Oligocene-Miocene NE-SW compression associated accommodation South American Plate at circa 27-26 Ma, WNW-ESE-trending sinistral NE-SW-trending dextral strike-slip faults; (III) Plio-Pleistocene N-S NNW-SSE related reactivation NW-SE-striking faults, generation NNW-SSE-trending (IV) Pleistocene-Holocene WNW-ESE that caused ENE-WSW-trending faults.
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ژورنال
عنوان ژورنال: Brazilian Journal of Geology
سال: 2022
ISSN: ['2317-4889', '2317-4692']
DOI: https://doi.org/10.1590/2317-4889202220210041