Caracterização sedimentar de ilhas barreiras-pontais arenosos, no entorno do campo petrolífero de Serra, Macau/RN, a partir de testemunhos por vibração
In the northern coast of Rio Grande do Norte are found sandy bodies parallel to the coastline, which isolate protected areas from the open sea impact, constituting dynamic systems of barrier islands - spits. The study deals with the description and analysis of 12 core samples of sedimentary material...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/34400 |
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| Resumo: | In the northern coast of Rio Grande do Norte are found sandy bodies parallel to the coastline, which isolate protected areas from the open sea impact, constituting dynamic systems of barrier islands - spits. The study deals with the description and analysis of 12 core samples of sedimentary material collected at four different points on sandy headlands (ARPrI and CPrI1) and barrier islands (CPrI2 and CPRI3), in the region of Macau, Rio Grande do Norte state. Sediment was collected using the vibration method, which allows for continuous, undisturbed sampling of poorly consolidated materials. A total of 15.75 meters of sedimentary material was recovered and submitted to radioactive profiling, texture, color, composition, mineralogy, granulometry and sedimentary structures studies. After the macroscopic description, the cores were sampled at regular intervals, resulting in 58 samples that were used for granulometric analysis, among which 52 were submitted to chemical analysis (quantification of organic matter and calcium carbonate content). The results obtained showed profiles with a slight difference in stacking pattern. The CPrI1 (A, B, C) and CPrI2 (A, B, C) samples showed a subtle and gradual variation, with an ascending granocrescence pattern, with material slightly coarser at the top than at the bottom. The ARPrI (A, B, C) and CPrI3 (A, B, C) core samples show an inverse pattern, with ascending granodecrescence, containing a coarse sand sediment at the base, tapering towards the top to fine sand. In all core samples there were variations in calcium carbonate and organic matter contents, the recorded carbonate contents varied from 0.35 to 32.36%, while the organic matter contents presented values between 0.47 and 25.7%. The characteristics presented by the sediments present in the studied cores allowed the identification of beach/island barrier deposits, tidal channel deposits, and tidal plain deposits, representative of tropical high-energy systems. |
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