Results 301 to 310 of about 1,387,580 (319)

The Niger (I) carbonaceous chondrite and implications for the origin of aggregates and isolated olivine grains in C2 chondrites

Earth and Planetary Science Letters, 1980
C. Desnoyers
exaly   +2 more sources

Ancient Oil as a Source of Carbonaceous Matter in 1.88-Billion-Year-Old Gunflint Stromatolites and Microfossils

Astrobiology, 2021
The 1.88-billion-year-old Gunflint carbonaceous microfossils are renowned for their exceptional morphological and chemical preservation, attributed to early and rapid entombment in amorphous silica.
B. Rasmussen, J. Muhling, W. Fischer
semanticscholar   +1 more source

Discriminating Abiotic and Biotic Fingerprints of Amino Acids and Fatty Acids in Ice Grains Relevant to Ocean Worlds

Astrobiology, 2020
Identifying and distinguishing between abiotic and biotic signatures of organic molecules such as amino acids and fatty acids is key to the search for life on extraterrestrial ocean worlds.
F. Klenner, F. Postberg, J. Hillier, N. Khawaja, M. Cable, B. Abel, S. Kempf, C. Glein, J. Lunine, R. Hodyss, R. Reviol, Ferdinand Stolz   +11 more
semanticscholar   +1 more source

GRAIN SIZE AND PETROGRAPHY OF C2 AND C3 CARBONACEOUS CHONDRITES

Meteoritics, 1978
Grain size frequency distributions of the ≥ 0.1 mm size fractions have been measured for 19 C2 and C3 carbonaceous chondrites (7 CM2, 5 CO3, 6 CV3 and 1 CV2). The grain size frequency distribution curves and summary statistics are remarkably similar for the CM2 and CO3 meteorites, with ranges of median grain size from 2.36φ to 2.67φ and graphic mean ...
Trude V.V. King, Elbert A. King
openaire   +1 more source

Biological pretreatment of carbonaceous matter in double refractory gold ores: A review and some future considerations

, 2020
The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease preg-robbing of gold and maximize gold recovery.
Kojo T. Konadu, D. M. Mendoza, R. Huddy, S. Harrison, T. Kaneta, K. Sasaki   +5 more
semanticscholar   +1 more source

Experimental study of laboratory-synthesized carbonaceous grains and astrophysical implications

AIP Conference Proceedings, 1994
We present here the most recent results obtained in the laboratory from various kinds of carbon‐based submicron grains. The joint use of VUV, IR and Raman spectroscopy allows to characterize them and to determine their structural and spectral properties. We compare our results with similiar data obtained by various authors on other kinds of carbonacous
L. Colangeli, V. Mennella, E. Bussoletti, G. Monaco, P. Merluzzi, P. Palumbo, A. Rotundi   +6 more
openaire   +1 more source

Measurements of molecular hydrogen formation on carbonaceous grains

1999
Measurements of molecular hydrogen formation on an amorphous carbon sample have been carried out under astrophysically relevant conditions, i.e., using low fluxes of cold (similar to 200 K) hydrogen-isotope beams, sample temperature be tween 5 K and 20 K.
PIRRONELLO, Valerio, Liu C, Roser JE, Vidali G.   +3 more
openaire   +1 more source

Disintegration Mechanism and Swelling–Consolidation Characteristics of Saturated Disintegrated Carbonaceous Mudstone

The Arabian journal for science and engineering, 2022
H. Fu, Qi-yi Yang, Ling Zeng, Qianhong Gao, W. Wen, Lu Chen   +5 more
semanticscholar   +1 more source

Oxygen isotope reservoirs in the outer asteroid belt inferred from oxygen isotope systematics of chondrule olivines and isolated forsterite and olivine grains in Tagish Lake-type carbonaceous chondrites, WIS 91600 and MET 00432

, 2017
M. Yamanobe, Tomoki Nakamura, D. Nakashima   +2 more
semanticscholar   +1 more source

Origin of isolated olivine grains in carbonaceous chondrites

Meteoritics and Planetary Science, 2021
Emmanuel Jacquet, Maxime Piralla, Yves Marrocchi   +2 more
exaly