991 resultados para Physicians--Africa, West--Drama
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The minerals of the clay fraction in estuarine plains are mainly detrital being a mixture of marine and continental sediments, but can also be authigenic. Because of the importance of mangrove ecosystems in tropical estuarine areas and the relatively few existing studies of the mineralogical composition of soils in these environments, the aim of this study was to determine the mineralogical assemblage and identify potential contrasts along the coast of the State of Sao Paulo. Soils from I I mangroves distributed along the coastal plain of the State of Sao Paulo were sampled at depths of 0 to 20 and 60 to 80 cm, and samples of suspended sediments from the Ribeira do Iguape River were collected for analysis. Mineralogical analyses were performed on the clay and silt fractions by x-ray diffraction (XRD) and transmission electron microscopy, and fresh soil samples were analyzed by scanning electron microscopy-energy dispersive spectrometry and suspended sediments by XRD. The silt fraction contained quartz, feldspars, gibbsite, kaolinite, illite, and vermiculite, and the clay fraction contained smectite, kaolinite, illite, gibbsite, quartz, and feldspars. Locally, vermiculite, biotite, anatase, halloysite, and goethite may occur because of recent transport of sediments to the system. Pyrite was identified in fresh samples. The allochthonous minerals found either were terrestrial and transported by rivers or had originated from the continental platform by past transgressive events. We suggest that the neoformation of smectite and kaolinite occurs in mangrove soils. Different geomorphological settings along the Sao Paulo coast appear to regulate mineral distribution in mangrove soils.
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Entry stair in foreground.
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As seen from pool deck, looking towards The Nest. Kitchen skylight above right.
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Upper level of North-West elevation, kitchen skylight on left.
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As seen from pool deck. Concrete framework for The Nest on left.
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As seen from car parking area.
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As seen from pool deck.
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Formal elevation facing University of Queensland entrance roads.
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Formal elevation facing University of Queensland entrance roads.
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Formal elevation facing University of Queensland entrance roads.
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Formal elevation facing University of Queensland entrance roads.
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Riverside Expressway building, Expressway on right.
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William St building, facing Riverside Expressway. Landscaped courtyard space in foreground.
