Characteristics and mass distribution of extraterrestrial dust from the Greenland ice CAP

Details Characteristics and mass distribution of extraterrestrial dust from the Greenland ice CAP Characteristics and mass distribution of extraterrestrial dust from the Greenland ice CAP

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328..699m&link_type=abstract

Nature (ISSN 0028-0836), vol. 328, Aug. 20, 1987, p. 699-702. CEA-CNRS-supported research.

Mathematics

Logic

60

Cosmic Dust, Greenland, Ablation, Chondrites, Glaciers, Land Ice, Mass Distribution, Micrometeorites, Micrometeorites, Interplanetary Dust, Samples, Extraterrestrial, Particles, Earth, Characteristics, Mass, Distribution, Grains, Size, Abundance, Origin, Source, Analysis, Cryoconite, Ice Caps, Chondritic Material, Deposits, Parent Bodies, Composition, Flux, Ablation, Photomicrographs, Electron Microscopy, Sem, Iridium, Magnetic Properties, Fragments, Spherules, Glasses, Description, Laboratory Studies, Fiel

Scientific paper

Analyses of extraterrestrial grains extracted from six samples of cryoconite (black dust) collected from the melt zone of the Greenland ice cap are presented. In addition to families of grains never reported before, a surprisingly high abundance of unmelted chondritic fragments is found in which the nonvolatile component of the parent bodies has been well preserved. The mass distribution is very similar to that of the micrometeorite flux at 1 AU, indicating that most of the grains are micrometeorites, and not ablation products of larger meteorites. These results provide new constraints on the ablation of such Greenland micrometeorites, as well as guidelines for using them as glaciological and geological markers.

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