By Monica Heilbron, Umberto G. Cordani, Fernando Flecha de Alkmim
The zone of the São Francisco river valley in jap Brazil encompasses major elements of the geologic framework of the South American continent: the São Francisco craton and its marginal orogenic belts. Cratons, because the oldest, differentiated and comparatively good items of the continental lithosphere, protect a considerable a part of the Earth's reminiscence. Orogenic belts, however, checklist collisional methods that happened in the course of a restricted time span. as a result of their topographic aid, mountain belts constructed alongside craton margins offer even though entry to rock successions now not uncovered within the low lands of the adjoining cratons. the mix of geologic info received in cratonic domain names and their marginal orogenic belts therefore shape the foundation for decoding great classes of Earth’s background.
Corresponding to the main intensively studied element of the Precambrian nucleus of the South American plate, the São Francisco craton and its margins host a rock checklist that spans from the Paleoarchean to the Cenozoic. Precambrian sedimentary successions that witness historical Earth methods - a lot of them of worldwide value - are specifically good preserved and uncovered during this sector. With these kinds of attributes the São Francisco craton including its fringing orogenic belts might be considered as a ‘continent inside a continent’ or a ‘continent in miniature’.
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Additional resources for São Francisco Craton, Eastern Brazil: Tectonic Genealogy of a Miniature Continent
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Komatiites) and metasedimentary rocks, truncated by gabbroic dikes Coeval, differentiated metakomatiites (Sm–Nd and Rb–Sr errorchrons between 3190 and 3220). Syntectonic intrusive trondhjemite (U–Pb inheritance of 3218 ± 16). Gabbroic dike (2706 ± 9 U–Pb age) NE-trending greenstone association intermingled with basement rocks, syntectonically intruded by trondhjemite-tonalite rocks. Basement remnant within the Neoproterozoic marginal Ribeira belt Alkmim and Noce (2006), Angelim (1997), Baars (1997) Rio Paraúna Rio Paraúna Supergroup: low- to medium grade metamorphic sequence: ultramaﬁc to felsic metavolcanics, chemical (BIF) and clastic sediments, schist, phyllite, quartzite, metaconglomerate Acid volcanic rock (U–Pb age of 2971 ± 8 Ma) Tectonic slices of encompassing basement rocks, overlying the southern portion of the Espinhaço Supergroup.
São Francisco Craton, Eastern Brazil: Tectonic Genealogy of a Miniature Continent by Monica Heilbron, Umberto G. Cordani, Fernando Flecha de Alkmim