Speleothems
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Paleopluviosidade no norte de Minas Gerais durante o glacial tardio e Holoceno com base em registros de espeleotemas / Paleo-precipitation variations in northern Minas Gerais during the later glacial period and Holocene from speleothem records
A partir de registros isotópicos (\ delta POT.18\ O e \ delta POT.13\ C), das razões elementos traços/Ca e das taxas de crescimento de espeleotemas precisamente datados pelo método U-Th, foi possível realizar a reconstituição das mudanças de paleopluviosidade e de feições paleoambientais da região do norte do estado de Minas Gerais, com alta resol
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/06/2011
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2. Modelagem e renderizaÃÃo da gÃnese e crescimento de espeleotemas em tempo-real / Modelagem e renderizaÃÃo da gÃnese e crescimento de espeleotemas em tempo-real
Among the many natural phenomena already studied in computer graphics research, the interior of caves remains largely unexplored. We present in this paper a plausible approach, based on Geological studies, for modeling the genesis and growth of speleothems. Speleothems are mineral depositions formed in caves, such as stalactites, stalagmites and columns. Our
Publicado em: 2009
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3. DEVELOPMENT OF A METHODOLOGY FOR CORALS AND SPELEOTHEMS DATING USING THE 230-TH/234-U METHOD, THROUGH CHROMATOGRAPHIC SEPARATION AND QUANTIFICATION BY ALPHA SPECTROMETRY AND FIA-ICP-MS / DESENVOLVIMENTO DE UMA METODOLOGIA PARA DATAÇÃO DE CORAIS E ESPELEOTEMAS UTILIZANDO O MÉTODO DA RAZÃO 230TH/234U, POR SEPARAÇÃO CROMATOGRÁFICA EQUANTIFICAÇÃO POR ESPECTROMETRIA ALFA E FIA-ICP-MS
This paper discusses the age determination of speleothems and corals using Uranium-series- imbalance method, more specifically the daughter deficient method - DD, particularly the 230Th/234U method. Different methodologies were tested using chromatographic extraction separation and quantification by alpha spectrometry and ICP-MS. Three different procedures w
Publicado em: 2006
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4. Metodologia de datação em carbonatos pela série de desequilíbrio do urânio por espectrometria de massa
There are many dating methods largely used according to the kind of material to be dated. Methods that rely on the time-dependency of geochemical disequilibrium 238 235 232 U, U and Th natural decay system, between daughter and parent isotope, from the whose final members are stable Pb isotopes, are the most useful in a broader variety of geological, hydrolo
Publicado em: 2006
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5. Dated co-occurrence of Homo erectus and Gigantopithecus from Tham Khuyen Cave, Vietnam.
Tham Khuyen Cave (Lang Son Province, northern Vietnam) is one of the more significant sites to yield fossil vertebrates in east Asia. During the mid-1960s, excavation in a suite of deposits produced important hominoid dental remains of middle Pleistocene age. We undertake more rigorous analyses of these sediments to understand the fluvial dynamics of Pleisto