Record Details

Evaluating changes in the elemental composition of micrometeorites during entry into the earth`s atmosphere

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Evaluating changes in the elemental composition of micrometeorites during entry into the earth`s atmosphere
 
Creator Rudraswami, N.G.
ShyamPrasad, M.
Dey, S.
Plane, J.M.C.
Feng, W.
Taylor, S.
 
Subject CHEMISTRY AND BIOGEOCHEMISTRY
GEOLOGY AND GEOPHYSICS
 
Description We evaluate the heating of extraterrestrial particles entering the atmosphere using the comprehensive chemical ablation model (CABMOD). This model predicts the ablation rates of individual elements in a particle with a defined size, composition, entry velocity, and entry angle with respect to the zenith (ZA). In the present study, bulk chemical analyses of 1133 Antarctica micrometeorites (collected from the south pole water well) are interpreted using CABMOD. The marked spread in Fe/Si values in unmelted, partially melted, and melted micrometeorites is explained by the loss of relatively volatile Fe during atmospheric entry. The combined theoretical modeling and elemental composition of the micrometeorites (Mg/Si ratios) suggest that ~85% of particles have a provenance of carbonaceous chondrites, the remaining ~15% are either ordinary or enstatite chondrites. About 65% of the micrometeorites have undergone 11–21 km s-1
 
Date 2016-01-08T06:48:33Z
2016-01-08T06:48:33Z
2015
 
Type Journal Article
 
Identifier The Astrophysical Journal, vol.814; 2015; no.78 doi: 10.1088/0004-637X/814/1/78
no
http://drs.nio.org/drs/handle/2264/4891
 
Language en
 
Relation Astrophys_J_814_1.jpg
 
Rights Copyright [2015] The American Astronomical Society. An edited version of this paper was published by the Society. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher The American Astronomical Society