Landforms and Landscape Evolution of the Equatorial Margin by Jean-Pierre Peulvast, François Bétard

By Jean-Pierre Peulvast, François Bétard

More than an easy monograph, the authors current a entire geomorphic assessment of a big tropical sector the place they express how decoding the long term landform evolution is helping knowing the current set of landscapes and morphodynamic environments. The Equatorial margin of the Brazilian “Nordeste” screens stratigraphic landmarks whose interpretation unearths the age and nature of landforms, resulting in a reconstruction of the geomorphic background by means of the technique of mixed morphostratigraphic and morphopedological ways. past the function of differential erosion regarding reasonable post-oceanic establishing uplift, the apparent and upland panorama displays a juxtaposition of landform and soil generations with regards to a shallow basin inversion, the final levels of which happened in semi-arid stipulations because the Oligocene. those effects throw mild on previous debates on versions of long term landform improvement in platform parts, and in addition support comparing fresh types of denudation and burial according to thermochronological methods.

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1997; Fetter et al. 1999). Better preserved Archean terranes are identified within this domain. 55 Ga: Arthaud et al. 2008) is made of strongly deformed plutonic rocks (tonalities, granodiorite) cross-cutting mafic metavolcanic rocks and associated metasediments. In central Ceará, the Troia-Pedra Branca massif (Santos et al. 2008), corresponding to the Mombaça and Cruzeta complexes of Arthaud et al. 7 Ga) is mostly made of migmatitic gneiss with compositional layering (granodiorite bands alternating with tonalite and granite bands).

1997). They were followed by the intrusion of a large volume of syn- to late-kinematic granitoids, by late-orogenic transcurrent movements under decreasing temperature conditions until 500 Myear, and by opening of molassic grabens in Ceará (Trompette 1994; Almeida et al. 2000). Earlier cooling occurred in the outer part of the belt, especially in the northern Medio Coreau domain by 575–560 Myear, whereas to the south of the Senador Pompeu shear zone, the inner part experienced cooling later, in the range 550–500 Myear (Monié et al.

2008). These high-grade metamorphic rocks, formed at infrastructural levels and often affected by partial melting, are overlain by remnants of Paleoproterozoic to Neoproterozoic supracrustal rocks, and all of them are intruded by ubiquitous Neoproterozoic granitoids. The province is subdivided into tectonic blocks by branched, anastomosed EW- and NE-trending shear zones which form a mechanical coherent system over more than 200,000 km2, one of the largest lithospheric transcurrent shear zone systems in the world (Vauchez et al.

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