Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/967192
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dc.contributor.authorOLIVEIRA, F.pt_BR
dc.contributor.authorSCHAEFER, C.pt_BR
dc.contributor.authorABRAHÃO, W.pt_BR
dc.contributor.authorALMEIDA, E. de P. C.pt_BR
dc.contributor.authorSIMAS, F.pt_BR
dc.date.accessioned2013-09-26T11:11:11Zpt_BR
dc.date.available2013-09-26T11:11:11Zpt_BR
dc.date.created2013-09-26pt_BR
dc.date.issued2013pt_BR
dc.identifier.citationIn: IAG INTERNACIONAL CONFERENCE GEOMORPHOLOGY, 8., 2013, Paris. Resumo... Frankfurt: Association Internacionale des Géomorphologues, 2013.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/967192pt_BR
dc.descriptionThe formation of highly phosphatized soils on sites of avian activity is a common feature of oceanic islands. We characterized a toposequence of phosphatic soils on Rata Island, to evaluate the soil genesis based on local topographic variations. For this purpose, four soils ranging from the upper hill down to the lowest landscape position on the island, representing a range of parent materials (basalt and calcareous sands), were analyzed. In the lowest landscape position a shallow Entisol was identified, strongly influenced by birds and marine sprays (Litholic Neosol), developed on " karstified" Pleistocene calcarenites; the three other soils in the upper part of the toposequence are Ornithogenic Inceptsols (Cambisols), ranging from a deep Cambisol profile on Basalt lava to intermediate Cambisols on mixed colluvial sediments of the basalt/calcareous. The lowermost Litholic Neosol is associated with a rugged landscape with strong calcarenite dissolution and karstification, related to a former wetter climate. The soil phosphatization is clearly an inherited process of the Late Quaternary age, when climate conditions were different. Initial weathering took place in the last interglacial period, under wetter conditions during which the Tertiary basalts were strongly weathered, leaving corestones in a saprolitic, oxidized mass. In the late Pleistocene, a gentle surface distributed these weathering products along the pediment slopes as colluvial materials, whereas in the coastal areas aeolian processes formed large sand dunes composed of reworked calcareous sands from marine sources during a time of very low sea level. During this time, widespread bird activity accounted for secondary apatite formation on the surface of calcareous oolites. Finally, the Holocene warming was accompanied by increasing sea level, enhanced tropical weathering, Fe and Al mobility and variscite formation superimposed on degraded Ca-phosphates, forming two phase phosphatic aggregates.pt_BR
dc.language.isoengpt_BR
dc.rightsopenAccesseng
dc.subjectOrnithogenic soilpt_BR
dc.subjectFernando de Noronha Archipelagopt_BR
dc.titleOrnithogenic soil toposequence on Rata island, Fernando de Noronha archipelago, south atlantic and quaternary paleoclimatic implications.pt_BR
dc.typeResumo em anais e proceedingspt_BR
dc.date.updated2013-09-26T11:11:11Zpt_BR
riaa.ainfo.id967192pt_BR
riaa.ainfo.lastupdate2013-09-26pt_BR
dc.contributor.institutionFábio OLIVEIRA; Carlos SCHAEFER; Walter ABRAHÃO; ELIANE DE PAULA CLEMENTE ALMEIDA, CNPS; Felipe SIMAS.pt_BR
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