Origin of hibonite-pyroxene spherules found in carbonaceous chondrites
نویسندگان
چکیده
منابع مشابه
Low-ca Pyroxene in Amoeboid Olivine Aggregates in Primitive Carbonaceous Chondrites
CHONDRITES. Alexander N. Krot, Mikhail I. Petaev, and Hisayoshi Yurimoto, Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI 96822, USA ([email protected]); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA ([email protected]); Earth and Planetary Sciences, Tokyo Institute ...
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Introduction: In the 1960s, prior to the widespread use of TEMs, several papers described rounded, micron-sized organic particles from carbonaceous chondrite (CC) meteorites [1-3]. Some of these particles were hollow. Except for two early TEM studies [4, 5], the rounded structures were essentially neglected until similar material was discovered in the Tagish Lake meteorite [6]. We subsequently ...
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Introduction: Melilite-free, spinel-, hibonitebearing spherules, a major type of refractory inclusion in CM2 chondrites, consist of phases that are predicted by thermodynamic calculations to condense from a cooling gas of solar composition but are not predicted to coexist with each other. Throughout updates and additions to the data base over the years, calculations [e.g. 1-3] consistently show...
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Powdered samples of a suite of 14 CR and CR-like chondrites, ranging from petrologic grade 1 to 3, were spectrally characterized over the 0.3–2.5 lm interval as part of a larger study of carbonaceous chondrite reflectance spectra. Spectral analysis was complicated by absorption bands due to Fe oxyhydroxides near 0.9 lm, resulting from terrestrial weathering. This absorption feature masks expect...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 1998
ISSN: 1086-9379,1945-5100
DOI: 10.1111/j.1945-5100.1998.tb01646.x