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- W601129436 abstract "Erosion of the Hercynian topographic relief of Iberia led to the formation of an extensive Principais aspectos geomorfologicos de Portugal Central, sua relacao com o registo sedimentar e a relevante importância do controlo tectonico. 153 planation surface, surrounded by a number of sedimentary basins. However, resistant quartzite ridges stand high above the regional surface which is essentially made otherwise of slates, metagreywackes and granites. In the western Iberian border, successive rifting phases produced sedimentation in a N-S complex graben and erosion took place along its eastern continent edge made of Hercynian rocks. This erosion mainly occurred in the late Triassic and Tithonian-Campanian. However, in the middle Campanian the geodynamic context changed to compression and the subsidence progressively decreased. In the middle Eocene, elongate NE-SW grabens — the Mondego and the Lower Tejo Tertiary basins — started to open and were progressively filled with arkose. Until the middle Tortonian, semi-arid and later subtropical conditions promoted regional planation and the supply to the sedimentary basins of feldspathic sands rich in smectite. Further compression then occurred and was expressed by NE-SW reverse and NNESSW strike-slip faults, which controlled the successive uplift events of important topographic highs such as the Portuguese Central Range and the Western Mountains. During the late Tortonian to Zanclean, under hot and dry conditions of climate, the drainage was endorheic and produced alluvial fan sedimentation along tectonic scarps. The more humid climatic conditions of the Piacenzian formed the present-day river networks draining towards the Atlantic. Large fluvial valleys were eroded, some endorheic basins (e.g. the Madrid Tertiary Basin) were captured, and weathering consisting of kaolinization and hydromorphism. During the Gelasian and the Pleistocene, colder and drier climatic conditions and compressive tectonics were the main controls of slope degradation and fluvial morphogenesis. Atlantic fluvial systems progressively captured the drainage networks of the endorheic basins and continuing regional uplift caused long-term fluvial incision. It is considered that the staircases of strath fluvial terraces were mainly a result of tectonic pulses; sea-level changes only significantly influenced the downcutting and infill of the lower reaches of the rivers." @default.
- W601129436 created "2016-06-24" @default.
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- W601129436 date "2011-04-26" @default.
- W601129436 modified "2023-09-25" @default.
- W601129436 title "Principais aspectos geomorfológicos de Portugal central, sua relação com o registo sedimentar e a importância do controlo tectónico" @default.
- W601129436 hasPublicationYear "2011" @default.
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