Autochthonous origin of the Encruzilhada Block, Dom Feliciano Belt, southern Brazil, based on aerogeophysics, image analysis and PT-paths
نویسندگان
چکیده
The Encruzilhada Block lies between the eastern hinterland and western foreland of Dom Feliciano Belt (southern Brazil) its tectonic meaning in orogenic evolution belt is still poorly understood. Its low magnetic signal similar to that supracrustal sequences, whereas high gammaspectrometric appears due post-collisional granitoids. Satellite image lineament analysis points similarities foreland, as structures both domains show predominantly NNW NNE trends, while mostly presents NE-trending structures. pre-orogenic connection indicated by correlation Várzea do Capivarita Cerro da Árvore complexes. Both contain 800 – 780 Ma metaigneous rocks with arc-like geochemistry, parametamorphic sedimentary provenance. Common syn-orogenic deformation history complexes suggested progressive P-T o-th E-W transpressive peak metamorphic age (660 640 Ma). PT-paths suggest exhumation Complex from high-T/low-P conditions 790–820 °C/4.4–4.8 kbar 660–720 °C/2.5–3.4 at ca. 630 Ma. On other hand, was subject metamorphism 555 565 °C/5.4–5.7 560–580 °C/5.8–6.3 kbar, which interpreted a result thickening. Evidence suggests have originated similar, if not single, basin on an attenuated lithosphere geothermal gradient, possibly (back-arc?) rift. Oblique collision has caused inversion thrusting lower crust over rift margin, may been accompanied delamination. Progressive transpressional voluminous magmatism (640 578 Ma) controlled major lineaments blurred original contact finally thermal 3 when autochthonous stabilized present geological configuration. intracontinental character shear zones limiting requires review existing evolutionary model for context Western Gondwana amalgamation.
منابع مشابه
Late to Post-Orogenic Brasiliano-Pan-African Volcano-Sedimentary Basins in the Dom Feliciano Belt, Southernmost Brazil
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ژورنال
عنوان ژورنال: Journal of Geodynamics
سال: 2021
ISSN: ['1879-1670', '0264-3707']
DOI: https://doi.org/10.1016/j.jog.2021.101825