elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Dhofar 225 and Dhofar 735: Relationship to CM2 chondrites and metamorphosed carbonaceous chondrites, Belgica-7904 and Yamato-86720

Ivanova, M.A. and Lorenz, C.A. and Nazarov, M.A. and Brandstätter, F. and Franchi, I. and Moroz, L.V. and Clayton, R.N. and Bychkov, A.Yu. (2010) Dhofar 225 and Dhofar 735: Relationship to CM2 chondrites and metamorphosed carbonaceous chondrites, Belgica-7904 and Yamato-86720. Meteoritics and Planetary Science, 45 (7), pp. 1108-1123. The Meteoritical Society. DOI: 10.1111/j.1945-5100.2010.01064.x.

Full text not available from this repository.

Abstract

Dhofar (Dho) 225 and Dho 735 are carbonaceous chondrites found in a hot desert and having affinities to Belgica-like Antarctic chondrites (Belgica [B-] 7904 and Yamato [Y-] 86720). Texturally they resemble CM2 chondrites, but differ in mineralogy, bulk chemistry and oxygen isotopic compositions. The texture and main mineralogy of Dho 225 and Dho 735 are similar to the CM2 chondrites, but unlike CM2 chondrites they do not contain any (P, Cr)-sulfides, nor tochilinite 6Fe0.9S*5(Fe,Mg)(OH)2. H2O-contents of Dho 225 and Dho 735 (1.76 and 1.06 wt%) are lower than those of CM2 chondrites (2-18 wt%), but similar to those in the metamorphosed carbonaceous chondrites of the Belgica-like group. Bulk compositions of Dho 225 and Dho 735, as well as their matrices, have low Fe and S and low Fe/Si ratios relative to CM2 chondrites. X-ray powder diffraction patterns of the Dho 225 and Dho 735 matrices showed similarities to laboratory-heated Murchison CM2 chondrite and the transformation of serpentine to olivine. Dho 225 and 735's oxygen isotopic compositions are in the high 18O range on the oxygen diagram, close to the Belgica-like meteorites. This differs from the oxygen isotopic compositions of typical CM2 chondrites. Experimental results showed that the oxygen isotopic compositions of Dho 225 and Dhofar 725, could not be derived from those of typical CM2 chondrites via dehydration caused by thermal metamorphism. Dho 225 and Dho 735 may represent a group of chondrites whose primary material was different from typical CM2 chondrites and the Belgica-like meteorites, but they formed in an oxygen reservoir similar to that of the Belgica-like meteorites.

Document Type:Article
Title:Dhofar 225 and Dhofar 735: Relationship to CM2 chondrites and metamorphosed carbonaceous chondrites, Belgica-7904 and Yamato-86720
Authors:
AuthorsInstitution or Email of Authors
Ivanova, M.A.Vernadsky Institute, RAS, Moscow, Russia
Lorenz, C.A.Vernadsky Institute, RAS, Moscow, Russia
Nazarov, M.A.Vernadsky Institute, RAS, Moscow, Russia
Brandstätter, F.Natural History Museum, Vienna, Austria
Franchi, I.The Open University, Milton Keynes, UK
Moroz, L.V.Ljuba.moroz@dlr.de
Clayton, R.N.Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA
Bychkov, A.Yu. Department of Geology, Moscow State University, Moscow, Russia
Date:July 2010
Journal or Publication Title:Meteoritics and Planetary Science
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:45
DOI:10.1111/j.1945-5100.2010.01064.x
Page Range:pp. 1108-1123
Publisher:The Meteoritical Society
Status:Published
Keywords:Meteorites; Carbonaceous chondrites; CM-chondrites; Mineralogy; Spectroscopy;
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Vergleichende Planetologie (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr. Liubov Moroz
Deposited On:06 Jan 2011 14:07
Last Modified:07 Feb 2013 20:15

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.