Carbonaceous micrometeorites from Antarctica
نویسندگان
چکیده
منابع مشابه
Immature Carbonaceous Matter in Concordia Antarctic Micrometeorites
Introduction: Antarctic MicroMeteorites (AMMs) represent the dominant source of extraterrestrial matter accreted by Earth today [1]. Some of them are ultracarbonaceous particles (UCAMMs) [2, 3, 4]. Furthermore, AMMs could have played a role in the origin of life on Earth [e.g. 5]. A better knowledge of their constituent carbonaceous matter could thus shed light on the formation of the organic m...
متن کامل\Hydrous-Carbonaceous" Micrometeorites on the Early Earth, Moon and Mars
Unmelted large micrometeorites with sizes of about 50-500 m were recovered from the Antarctica and Greenland ice sheets. Their capture in such \space collectors" made of very clean ices, where they got both shielded from most terrestrial contaminants and preserved by deep freeze, allowed for the rst time the investigation of their carbon chemistry. Mass ux measurements in both ice sheets indica...
متن کاملCometary Origin of the Zodiacal Cloud and Carbonaceous Micrometeorites
The zodiacal cloud is a thick circumsolar disk of small debris particles produced by asteroid collisions and comets. The relative proportion in which these two source populations contribute to the zodiacal cloud and the exact physical mechanism that generates the bulk of observed dust were unknown. Here we model the IRAS observations of thermal emission from asteroid and cometary particles to e...
متن کاملFine-grained Mineralogy of Cometary Ultra- Carbonaceous Antarctic Micrometeorites
Introduction: The CONCORDIA micrometeorite collection recovered from central Antarctic snow contains fluffy, fragile particles [1] among which we identified some UltraCarbonaceous Antarctic Micrometeorites (UCAMMs) [2, 3]. UCAMMs are dominated by up to ~ 80 vol% of carbonaceous material that contains small and complex mineral assemblages [2-4]. Their structure and chemical compositions are remi...
متن کاملCometary Origin of the Zodiacal Cloud and Carbonaceous Micrometeorites. Implications for Hot Debris Disks
The zodiacal cloud is a thick circumsolar disk of small debris particles produced by asteroid collisions and comets. Their relative contribution and how particles of different sizes dynamically evolve to produce the observed phenomena of light scattering, thermal emission, and meteoroid impacts are unknown. Until now, zodiacal cloud models have been phenomenological in nature, composed of ad ho...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 1998
ISSN: 1086-9379,1945-5100
DOI: 10.1111/j.1945-5100.1998.tb01665.x