Reconstruction of a volcano-sedimentary environment shared by the Porongos and Várzea do Capivarita complexes at 790 Ma, Dom Feliciano Belt, southern Brazil
نویسندگان
چکیده
This work investigates the pre-collisional (before ca. 650 Ma) history of Dom Feliciano Belt in southernmost Brazil through geochronological and zircon oxygen isotope study. U–Pb SHRIMP dating two orthogneiss samples from Várzea do Capivarita Complex one metarhyolite sample Porongos yielded crystallisation ages 786 ± 5 Ma, 780 10 Ma 787 respectively. The mean values calculated for 790 cores orthogneisses are 8.41 0.13‰ 8.68 0.14‰, 8.75 0.72‰ metarhyolite. Such suggest that crystallised more evolved magmas, either melting host rocks sediments or assimilation crustal material by mantle-derived magmas. detrital population was analysed additional paragneiss Complex, most cluster at 790–750 Ma. data spread is centred which age interleaved orthogneisses. In our interpretation, such dataset suggests a syn-volcanic origin protolith and, therefore, volcano-sedimentary Complex. correspondence studied meta-igneous complexes have shared same igneous history. Therefore, probably represent magmatic event different levels single basin 800–770 results bring first-order information about meaning tectonic limits this Gondwana-related belt implications reconstructing orogen.
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: Precambrian Research
سال: 2022
ISSN: ['1872-7433', '0301-9268']
DOI: https://doi.org/10.1016/j.precamres.2022.106774