TY - JOUR
T1 - A refractory Ca-SiO-H2-O2 vapor condensation experiment with implications for calciosilica dust transforming to silicate and carbonate minerals
AU - Rietmeijer, Frans J.M.
AU - Pun, Aurora
AU - Kimura, Yuki
AU - Nuth, Joseph A.
N1 - Funding Information:
F.J.M.R. and A.P. acknowledge grant NNG04GM48A from the NASA Goddard Space Flight Center. J.A.N. is grateful for the support he has received from the Cosmochemistry Program at NASA Headquarters. HRTEM analyses were performed in the Electron Microbeam Analyses Facility in the Department of Earth and Planetary Sciences (UNM) where Dr. Ying-Bing Jiang provided technical assistance.
PY - 2008/5
Y1 - 2008/5
N2 - Condensates produced in a laboratory condensation experiment of a refractory Ca-SiO-H2-O2 vapor define four specific and predictable deep metastable eutectic calciosilica compositions. The condensed nanograins are amorphous solids, including those with the stoichiometric CaSiO3 pyroxene composition. In evolving dust-condensing astronomical environments they will be highly suitable precursors for thermally supported, dust-aging reactions whereby the condensates form more complex refractory silicates, e.g., diopside and wollastonite, and calcite and dolomite carbonates. This kinetically controlled condensation experiment shows how the aging of amorphous refractory condensates could produce the same minerals that are thought to require high-temperature equilibrium condensation. We submit that evidence for this thermal annealing of dust will be the astronomical detection of silica (amorphous or crystalline) that is the common, predicted, by-product of most of these reactions.
AB - Condensates produced in a laboratory condensation experiment of a refractory Ca-SiO-H2-O2 vapor define four specific and predictable deep metastable eutectic calciosilica compositions. The condensed nanograins are amorphous solids, including those with the stoichiometric CaSiO3 pyroxene composition. In evolving dust-condensing astronomical environments they will be highly suitable precursors for thermally supported, dust-aging reactions whereby the condensates form more complex refractory silicates, e.g., diopside and wollastonite, and calcite and dolomite carbonates. This kinetically controlled condensation experiment shows how the aging of amorphous refractory condensates could produce the same minerals that are thought to require high-temperature equilibrium condensation. We submit that evidence for this thermal annealing of dust will be the astronomical detection of silica (amorphous or crystalline) that is the common, predicted, by-product of most of these reactions.
KW - Comets
KW - Disks
KW - Experimental techniques
KW - Mineralogy
KW - dust
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U2 - 10.1016/j.icarus.2007.11.022
DO - 10.1016/j.icarus.2007.11.022
M3 - Article
AN - SCOPUS:42149143458
VL - 195
SP - 493
EP - 503
JO - Icarus
JF - Icarus
SN - 0019-1035
IS - 1
ER -