JMDMT #2664 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - 12 cm (exact weight unknown but estimated at ∼30 kg). opaque minerals. There are two textures. In the larger part of the Mineralogy and classification (D. H. Hill, UAz): the specimen appears sections, olivine occurs as rounded euhedral grains,...
JMDMT #2501 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - pyroxene experienced an additional annealing event. The second annealing after a prolonged (first) annealing may produce the Ca gradient near the interface between augite lamella and low-Ca pyroxene. A 39Ar-40Ar age of 4.495 Ga for Ibitira may...
JMDMT #2500 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - of augite lamella is out of shape. This cooling history may correspond to a prolonged annealing (the first annealing [1]) which caused pyroxene equilibrium. Pyroxene initially having the uniform bulk Ca content of 16 mol% and mg# (=100 x Mg/(Mg...
JMDMT #2498 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - 2]. It is generally considered that noncumulate eucrites were crystallized from basaltic melts on the surface of the HED parent body [3]. Recently, Bogard and Garrison [2] reported a 39Ar-40Ar age of 4.495 Ga for Ibitira. This age ranks among...
JMDMT #2497 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection -30, 586-587. [2] Allsopp H. L. et al. (1991) S. Afr. J. Sci., 87, 431-442. [3] Grieve R. A. F. et al. (1991) JGR, 96, 22,753-22,764. [4] Krogh T. E. et al. (1984) OGS, Sp. Vol. 1, 431-446. [5] Kamo S. L. et al. (1995) Geocongress 95, S. Africa,...
JMDMT #2492 Microfossils of Cyanobacteria in Carbonaceous Meteorites
- Length: 1:24
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The James M. DuPont Meteorite Collection - thermal annealing event at effective temperature up to 400 degrees C; (2) TL parameters for the monomineral grains mainly reflects their shock-induced structure properties [2,3]; (3) Zagami meteorite might have originated in the...
JMDMT #2060 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - In addition, more abundant than the spherules, there are numerous irregular clasts of limestone about the same size as the spherules, with subangular outlines which show that the clasts were solid at the time of emplacement. These clasts are...
JMDMT #1702 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - rich in N. Charges were melted in graphite in the PC apparatus at 1750 degrees C and 10 kbar and quickly cooled to final temperatures between 1200 degrees C and 1500 degrees C where they were annealed from several hours to days. Compositions...
JMDMT #1652 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - liquid droplets occurred at preferred Al2O3/SiO2 configurations during the gas-liquid transition. The preservation of compositional peaks in the annealed sample (1100 degrees C) confirms that isolated entities were prevented from reacting to...
JMDMT #1651 Microfossils of Cyanobacteria in Carbonaceous Meteorites
- Length: 0:56
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The James M. DuPont Meteorite Collection - the disappearance of this peak and the smallest grains to thermal annealing. The presence of two morphologically-distinct grains can be explained using the SiO2-Al2O3 equilibrium binary phase diagram [2] wherein compositions of the rimmed...
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