Meteorites
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Serra Pelada: the first Amazonian Meteorite fall is a Eucrite (basalt) from Asteroid 4-Vesta
ABSTRACT Serra Pelada is the newest Brazilian eucrite and the first recovered fall from Amazonia (State of Pará, Brazil, June 29th 2017). In this paper, we report on its petrography, chemistry, mineralogy and its magnetic properties. Study of four thin sections reveals that the meteorite is brecciated, containing basaltic and gabbroic clasts, as well of rec
An. Acad. Bras. Ciênc.. Publicado em: 01/02/2018
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2. The Buritizal meteorite: classification of a new Brazilian chondrite
Abstract On August 14, 1967, the reporter Saulo Gomes, working at TV Tupi, went to a small city in the State of São Paulo called Buritizal to investigate reports of a meteorite fall and write a newspaper report. He actually recovered three fragments of the meteorite at a small farm. In 2014, he donated one of the fragments to the Museu Nacional of the Unive
REM, Int. Eng. J.. Publicado em: 2017-06
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3. Caracterização geológica da estrutura de impacto de Riachão, MA / Geologic characterization of Riachão impact structure, MA
Atualmente são conhecidas em toda superfície terrestre cerca de 180 estruturas formadas por impacto de meteoritos. No Brasil, foram diagnosticadas seis estruturas originadas por este tipo de evento: Araguainha (MT-GO), Vargeão (SC), Vista Alegre (PR), Cerro do Jarau (RS), Serra da Cangalha (TO) e Riachão (MA). A área de estudos é a estrutura de impacto
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2012
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4. Meteorites: messengers from the outer space
Milhares de meteoróides, corpos sólidos do espaço extra-terrestre, entram na atmosfera da Terra a cada ano. São pedaços de rocha, metal ou aglomerados de rocha e metal, variando em massa de frações de grama a centenas de quilogramas. Aqueles que sobrevivem à passagem através da atmosfera e caem na Terra, são chamados meteoritos. Os meteoritos são
Journal of the Brazilian Chemical Society. Publicado em: 2008
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5. HYPERSONIC CHEMOSYNTHESIS AND POSSIBLE FORMATION OF ORGANIC COMPOUNDS FROM IMPACT OF METEORITES ON WATER
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6. Extraterrestrial amino acids in Orgueil and Ivuna: Tracing the parent body of CI type carbonaceous chondrites
Amino acid analyses using HPLC of pristine interior pieces of the CI carbonaceous chondrites Orgueil and Ivuna have found that β-alanine, glycine, and γ-amino-n-butyric acid (ABA) are the most abundant amino acids in these two meteorites, with concentrations ranging from ≈600 to 2,000 parts per billion (ppb). Other α-amino acids such as alanine, α
The National Academy of Sciences.
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7. Condensation Time of the Solar Nebula from Extinct 129I in Primitive Meteorites
Mineral separates from five carbonaceous chondrites were dated by extinct 16 million year 129I, in an attempt to establish the condensation time of the solar nebula. Two Fe3O4 or Fe3O4-FeS samples from the Murchison and Orgueil meteorites are older than any other material dated thus far, and apparently formed within 2 × 105 years of each other. The great ag
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8. Terrestrial and Meteorite Carbon Appear to Have the Same Isotopic Composition
The carbon-isotope ratio recently obtained for the carbon found in the Murchison meteorite, which has been shown (by the racemic nature of twelve component amino acids) to be free of terrestrial contamination, agrees with that for average terrestrial sediments. This finding indicates that the earth and the stony meteorites contain carbon of the same isotopic
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9. Astrophysical symmetries
Astrophysical objects, ranging from meteorites to the entire universe, can be classified into about a dozen characteristic morphologies, at least as seen by a blurry eye. Some patterns exist over an enormously wide range of distance scales, apparently as a result of similar underlying physics. Bipolar ejection from protostars, binary systems, and active
The National Academy of Sciences of the USA.
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10. Pre-Global Surveyor evidence for Martian ground water
A time-dependent theory for the evolution of water on Mars is presented. Using this theory and invoking a large number of observational constraints, I argue that these constraints require that a large reservoir of water exists in the Martian crust at depths shallow enough to interact strongly with the atmosphere. The constraints include the abundance of
The National Academy of Sciences.
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11. Fullerenes: An extraterrestrial carbon carrier phase for noble gases
In this work, we report on the discovery of naturally occurring fullerenes (C60 to C400) in the Allende and Murchison meteorites and some sediment samples from the 65 million-year-old Cretaceous/Tertiary boundary layer (KTB). Unlike the other pure forms of carbon (diamond and graphite), fullerenes are extractable in an organic solvent (e.g., toluene or 1,2,4
The National Academy of Sciences.
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12. COMPARISON OF LUNAR WITH TERRESTRIAL AND METEORITIC ROCKS*
This note examines critically recent attempts to identify or closely correlate lunar surface samples—on the basis of alpha-scattering analysis—with terrestrial igneous rocks (basalts) or with eucrite meteorites. Basalts show considerable variety; but all have chemical characteristics inherited from terrestrial mantle rock melted under a limited range of