Source Rocks
Mostrando 13-24 de 83 artigos, teses e dissertações.
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13. Is Composting a Route to Solubilize Low-Grade Phosphate Rocks and Improve MAP-Based Composts?
ABSTRACT: In alkalinized and Ca-rich composts, solubilization of apatite from phosphate rocks (PRs) is not guaranteed; however, chelating agents and humified substances produced during composting may alter the soluble contents and P forms of monoammonium phosphate (MAP)-based composts. These effects may depend on the proportions of organic wastes and P sourc
Rev. Bras. Ciênc. Solo. Publicado em: 15/02/2018
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14. Pb isotope geochemistry and reappraisal of Sr-Nd isotopes of the Cerro Morado basic magmatism (Ischigualasto-Villa Union Triassic basin, NW Argentina): Implications for the mantle sources
ABSTRACT: Sr-Nd-Pb isotopic signatures were determined for silica-undersaturated hypabyssal alkaline basic rocks of the Los Baldecitos Formation in the Cerro Morado area, situated in the Ischigualasto - Vale de la Luna Provincial Park (northernmost San Juan Province, Argentina). The basic rocks show slight variations of the Sr-Nd-Pb isotopes and similar beha
Braz. J. Geol.. Publicado em: 2018-01
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15. Sedimentary provenance in the southern sector of the São Francisco Basin, SE Brazil
ABSTRACT: We present new Sm-Nd, U-Pb and Hf isotope geochronological data for the siliciclastic rocks in the southern sector of the São Francisco Basin. An abrupt change in the Sm-Nd data is observed from the Carrancas Formation’s oligomitic conglomerates (TDM ages between 2.7 and 3.3 Ga; εNd(550 Ma) values between -25.09 and -17.98), its finer facies, a
Braz. J. Geol.. Publicado em: 2018-01
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16. Antifungal activity of extracts from Atacama Desert fungi againstParacoccidioides brasiliensis and identification ofAspergillus felis as a promising source of natural bioactive compounds
Fungi of the genus Paracoccidioides are responsible for paracoccidioidomycosis. The occurrence of drug toxicity and relapse in this disease justify the development of new antifungal agents. Compounds extracted from fungal extract have showing antifungal activity. Extracts of 78 fungi isolated from rocks of the Atacama Desert were tested in a microdilution as
Mem. Inst. Oswaldo Cruz. Publicado em: 2016-03
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17. The Cogollo Group and the oceanic anoxic events 1a and 1b, Maracaibo basin, Venezuela
ABSTRACTCarbonates of Cogollo Group (Apón, Lisure and Maraca formations) constitute the broader calcareous platform system originated during Aptian and Albian of Cretaceous in north-western South America, Maracaibo Basin, Venezuela. On the shallow shelf, a variety of calcareous sedimentary facies were deposited during marine transgressive and regressive cyc
Braz. J. Geol.. Publicado em: 2015-08
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18. Petrologia e geocronologia do complexo máfico-ultramáfico trincheira, sudoeste do cráton amazônico: implicações tectônicas do mesoproterozóico
The tectonic framework of the ultramafic-mafic rocks of the southwestern Amazon Craton is generally little known. Most of work this cratonic portion is focused on the geochronological studies of granitoids, so that little is known about the origin and tectonic significance of these rocks. In this context, this study contributes to the knowledge of the tecton
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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19. Caracterização geoquímica de rochas geradoras do intervalo Cretáceo-Terciário da Bacia de Santos, Brasil.
A Bacia de Santos é uma das principais bacias brasileiras para exploração e produção de hidrocarbonetos, e vem recebendo grandes investimentos em pesquisa nos últimos anos. O estudo das rochas geradoras serve como importante ferramenta para o estudo de modelos de geração, explusão e migração de hidrocarbonetos e na identificação de sistemas petr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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20. Análise das rochas geradoras das formações Constancia e Cifuentes (Jurássico Superior) através dos parâmetros petrográficos e de geoquímica orgânica. Bacia da Margem Continental Cubana
O objetivo deste trabalho foi descrever as principais características da matéria orgânica contida em rochas sedimentares do Jurássico da Unidade Tectono-Estratigráfico Placetas, compreendendo as Formações Constancia e Cifuentes da Bacia Marginal do Norte de Cuba. A combinação do estudo óptico e químico provê uma importante compreensão sobre o ti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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21. Structural evolution and tectonic setting of the Porongos belt, southern Brazil
The SW–NE-striking Porongos belt, located between juvenile Neoproterozoic rocks in the west and the Dom Feliciano belt, characterized by intense reworking of older crust, in the east, comprises a greenschist to amphibolite-facies metavolcano-metasedimentary succession (Porongos sequence) of unknown age with some exposures of Palaeoproterozoic gneisses (Enc
Publicado em: 2011
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22. Geoquímica e geocronologia sedimentarno estudo das sequências paleozoica e pré-rifte de bacias do nordeste brasileiro
Integrated application of geochemical and sedimentary geochronology in pelitic rock samples from the basal section of the northeastern Brazilian continental margin, especially those of the Paleozoic and pre-rift sequences is the main goal of this thesis. The results are presented and discussed in three technical articles. Two of these articles present the Rb
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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23. Utilization of rocks and ectomycorrhizal fungi to promote growth of eucalypt
The utilization of rocks as fertilizers is limited by their low solubility. However, solubilization may be achieved by some micro-organisms, such as ectomycorrhizal fungi (ECMf). The aim of this study was to evaluate the potential of seven isolates of ECMf to solubilize two rocks, alkaline breccia and granite, and to liberate potassium and phosphorus for Euc
Brazilian Journal of Microbiology. Publicado em: 2010-10
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24. Razões isotópicas 87Rb/86Sr, 87Sr/86Sr e 143Nd/144Nd como traçadores de proveniência de rochas sedimentares siliclásticas: exemplos no Grupo Camaquã(Paleozóico interior; RS, Brasil)
The Rb-Sr and Sm-Nd isotopic systems are ideal in constraining the provenance of fine-grained clastic rocks. This is particularly true for continental, fluvio-lacustrine, sedimentary units deposited under semi-arid climate conditions, where mechanical desintegration of source rocks dominates the weathering processes. Three sets of red-colored, continental si
Publicado em: 2010