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JMDMT #1589 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:21
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Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - but show evidence of transformation of phyllosilicates to olivine [5, 6]. The CM chondrite Y-793321 also shows the transformation [7], but retains a typical CM-like isotopic composition. Dark inclusions from CV chondrites (Allende, Efremovka,...

JMDMT #1571 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:4
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Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - The low Na and K contents in members of the CV-reduced subgroup have been interpreted as incomplete sampling of Na and K phases during accretion [1]. Although Efremovka is a find, the chemical peculiarities of Efremovka are unlikely to be...

JMDMT #1569 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:17
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Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - addition, most siderophile elements (P, Ga, As, Au) follow Ni in having have rather uniform concentrations in the subsamples. Variations in Co are parallel to those in Fe. This leads to constant Fe/Co-ratios but significantly variable Ni/Co...

JMDMT #1567 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:27
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Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - to understand the mineralogical relationships better, and to determine whether the bulk composition of the inclusion is fractionated. References: [1] Jones R. H. and Brearley A. J. (1994) LPS XXV, 641-642. [2] Hutcheon I. D. and Jones R. H....

JMDMT #1550 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:5
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Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - host Allende and Allende dark inclusions (DI) have been studied by TEM. Matrix Olivines: Although most matrix olivines in Allende are free of inclusions, a significant number contain Cr-spinel and pentlandite inclusions. Widespread poorly...

JMDMT #1305 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:3
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View Count: 10
Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - Chondrule separates also plot along the mixing line [6], as does the DI, which plots near Allende and Vigarano DIs. Discussion: Ningqiang differs from most CV3 chondrites in having relatively lower refractory lithophile-element abundances and a...

JMDMT #1276 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 1:26
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Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - the altered groundmasses in all CV3 chondrites. Chondrules in Leoville do not show the alteration textures mentioned above. Chondrules in reduced CV chondrites were considered to have hardly experienced alteration reactions [4,6]. However, our...

JMDMT #1274 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Length: 0:58
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View Count: 6
Author: h4ck3rm1k3

Tags: Carbonaceous Cyanobacteria Fossils Life Meteorite

The James M. DuPont Meteorite Collection - ranging from Fo(sub)99-65. Ferroan olivine (Fo(sub)54-75) commonly replaces enstatite phenocrysts among the altered groundmasses. On the other hand, two chondrules contain phlogopite in the altered groundmasses, suggesting that an aqueous...