Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Allende meteorites

Meteorites present an opportunity to look at geological time or the time told by radionucleotides within rocks. The oldest rocks found on Earth are not as old as the age of the Earth due to continual reprocessing of the Earth s surface. The oldest discovered rocks so far are the Acasta gneisses from Northwestern Canada, which are 4.03 Gyr, but these are young compared with the CAIs found in the Allende meteorite, which are 4.566 0.002 Gyr or 4.556 billion years. The ages of these species are derived from the relative abundances of radioisotopes and their daughter species, as seen in Table 6.3. [Pg.165]

The application of the laser probe to meteorite chronology is illustrated by a study of Ca-Al-rich inclusions from the Allende meteorite [7]. This study was able to show that the K in the inclusions studied mainly concentrated in veins and rims with very little, if any, K in the major minerals. The limit obtained is something of the order of 10 ppm. On the other hand, the major minerals do contain appreciable 40Ar. Individual chondrules and the matrix were also studied in the Allende meteorite from places adjacent to the Ca-Al-rich inclusions. For these samples the ages varied from 3.3 to 4.4 G.y. There appears to be evidence that the Allende meteorite has been subjected to numerous metamorphic events, presumably of a collisional origin. [Pg.151]

Clayton RN, MacPherson GJ, Hutcheon ID, Davis AM, Grossman L, Mayeda TK, Molini-Velsko CA, Allen JM, El Goresy A (1984) Two forsterite-bearing FUN inclusions in the Allende meteorite. Geochim Cosmochim Acta 48 535-548... [Pg.58]

Lee T (1988) Implications of isotopic anomalies for nucleosynthesis. In Meteorites and the Early Solar System. Kerridge JF, Matthews MS (eds) University of Arizona Press, Tucson, p 1063-1088 Lee T, Papanastassiou DA (1974) Mg isotopic anomalies in the Allende meteorite and correlation with O and Sr effects. Geophys Res Lett 1 225-228... [Pg.60]

Lee T, Papanastassiou DA, Wasserburg GJ (1978) Calcium isotopic anomalies in the Allende meteorite. Astrophys J 220 L21-L25... [Pg.60]

Leya I, Wider R, Halliday AN (2000) Cosmic-ray production of tungsten isotopes in lunar samples and meteorites and its implications for Hf-W cosmochemistry. Earth Planet Sci Lett 175 1-12 Loss RD, Lugmair GW (1990) Zinc isotope anomalies in Allende meteorite inclusions. Astrophys J 360 L59-L62... [Pg.60]

Lugmair GW, Marti K, Scheinin NB (1978) Incomplete mixing of products from r-, p-, and s-process nucleosynthesis Sm-Nd systematics in Allende inclusion EK141. Lunar Planet Sci IX 672-673 Lugmair GW, Shimamura T, Lewis RS, Anders E (1983) Samarium-146 in the early solar system evidence from neodymium in the Allende Meteorite. Science 222 1015-1018 Lugmair GW, Shukolyukov A (1998) Early solar system timescales according to Mn- Cr systematics. Geochim Cosmochim Acta 62 2863-2886... [Pg.60]

MacPherson GJ, Huss GR, Davis AM (2003) Extinct Be in type A calcium-aluminum-rich inclusions from CV chondrites. Geochim Cosmochim Acta 67 3615-3179 Matthews GJ, Cowan JJ (1990) New insights into the astrophysical r-process. Nature 345 491-494 McCulloch MT, Wasserburg GJ (1978a) Barium and neodymium isotopic anomalies in the Allende meteorite. Astrophys J 220 L15-L19... [Pg.61]

McCulloch MT, Wasserburg GJ (1978b) More anomalies from the Allende meteorite Samarium. Geophys Res Lett 5 599-602... [Pg.61]

McKeegan KD, Chaussidon M, Robert E (2000) Incorporation of short-lived Be in a calcium-aluminium-rich inclusion from the Allende Meteorite. Science 289 1334-1337 Merrill PW (1952) Technetium in the stars. Science 115 484-486... [Pg.61]

Papanastassiou DA (1986) Chromium isotopic anomalies in the Allende meteorite. Astrophys J 308 L27-L30 Papanastassiou DA, Wasserburg GJ (1969) Initial strontium isotopic abundances and the resolution of small time differences in the formation of planetary objects. Earth Planet Sci Lett 5 361-376 Papanastassiou DA, Wasserburg GJ (1978) Strontium isotopic anomalies in the Allende meteorite. Geophys Res Lett 5 595-598... [Pg.61]

Young ED, Ash RD, Galy A, Belshaw NS (2002) Mg isotope heterogeneity in the Allende meteorite measured by UV laser ablation-MC-ICPMS and comparisons with O isotopes. Geochim Cosmochim Acta 66 683-698... [Pg.64]

Young et al. (2002a) showed that ultraviolet laser ablation combined with MC-ICPMS (LA-MC-ICPMS) can offer advantages over other methods of spatially resolved Mg isotopic analysis of meteorite materials. They collected data for chondrules and a CAI from the Allende meteorite. Each datum in that study represents approximately 2.8 pg of material (based on a laser spot diameter of 100 pm and laser pit depth of 30 pm depths are uncertain to + 20%). [Pg.225]

Lee T, Papanastassiou DA, Wasserburg GJ (1977) Mg and Ca isotopic study of individual microscopic crystals from the Allende meteorite by the direct loading technique. Geochim Cosmochim Acta 41 1473-1485 Lee T, Russell WA, Wasserburg GJ (1979) Calcium isotopic anomalies and the lack of aluminum-26 in an unusual Allende inclusion. Appl J Lett 228(L93-L98) 661-662 Marshall BD, DePaolo DJ (1982) Precise age determinations and petrogenetic studies using the K-Ca method. Geochim Cosmochim Acta 46 2537-2545... [Pg.286]

Fuchs (1971) identified acicular wollastonite from the Allende meteorite. Miyamoto et al. (1979) called these extraterrestrial crystals whiskers. Massive deposits of fibrous wollastonite in minable quantities occur in the Adirondack Mountain region of New York State. [Pg.50]

Miyamoto, M., N. Onuma, and H. Takeda (1979). Wollastonite whiskers in the Allende meteorite and their bearing on a possible post condensation process. Geochem. J. 13 1-5. [Pg.99]

Broken surface of the Allende meteorite, a chondrite that fell in Mexico in 1969. Note the abundant round chondrules and white calcium-aluminum inclusions. [Pg.7]

McKeegan, K. D., Chaussidon, M. and Robert, F. (2000) Incorporation of short-lived 10Be in a calcium-aluminum-rich inclusion from the Allende meteorite. Science, 289, 1334-1337. [Pg.304]

McCulloch, M. T. and Wasserburg, G. J. (1978a) Barium and neodymium isotopic anomalies in the Allende meteorite. Astrophysical Journal, 220, L15-L19. [Pg.516]

See other pages where Allende meteorites is mentioned: [Pg.67]    [Pg.168]    [Pg.173]    [Pg.100]    [Pg.101]    [Pg.106]    [Pg.147]    [Pg.392]    [Pg.31]    [Pg.58]    [Pg.226]    [Pg.229]    [Pg.262]    [Pg.263]    [Pg.338]    [Pg.556]    [Pg.556]    [Pg.268]    [Pg.285]    [Pg.301]    [Pg.399]   
See also in sourсe #XX -- [ Pg.67 ]

See also in sourсe #XX -- [ Pg.39 , Pg.495 ]

See also in sourсe #XX -- [ Pg.413 ]

See also in sourсe #XX -- [ Pg.413 ]



SEARCH



Allende meteorite carbynes

Allende meteorite correlation

Allende meteorite evolution diagram

Allende meteorite inclusions 3510 type

Allende meteorite isotope correlation

Allende meteorite measurements

Allende meteorite minerals

Allende meteorite standard

Meteorites, individual Allende

Meteoritic

Meteoritics

© 2024 chempedia.info