TY  - GEN
A1  - Voropaev, S.
A1  - Korochantsev, A.
A1  - Petukhov, D.
A1  - Kocherov, A.
A1  - Kaeter, David
A1  - Ziemann, Martin Andreas
A1  - Boettger, Ute
T1  - Ordinary chondrites of Chelyabinsk meteorite and comparison with asteroid 25143 (Itokawa)
T2  - PLoS one
Y1  - 2016
SN  - 1086-9379
SN  - 1945-5100
VL  - 51
SP  - A644
EP  - A644
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Kaeter, David
A1  - Ziemann, Martin Andreas
A1  - Böttger, Ute
A1  - Weber, Iris
A1  - Hecht, Lutz
A1  - Voropaev, Sergey A.
A1  - Korochantsev, Alexander V.
A1  - Kocherov, Andrey V.
T1  - The Chelyabinsk meteorite
BT  - new insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites
JF  - Meteoritics & planetary science : journal of the Meteoritical Society
N2  - We present results of petrographic, mineralogical, and chemical investigations of three Chelyabinsk meteorite fragments. Three distinct lithologies were identified: light S3LL5, dark S4-S5LL5 material, and opaque fine-grained former impact melt. Olivine-spinel thermometry revealed an equilibration temperature of 703 +/- 23 degrees C for the light lithology. All plagioclase seems to be secondary, showing neither shock-induced fractures nor sulfide-metal veinlets. Feldspathic glass can be observed showing features of extensive melting and, in the dark lithology, as maskelynite, lacking melt features and retaining grain boundaries of former plagioclase. Olivine of the dark lithology shows planar deformation features. Impact melt is dominated by Mg-rich olivine and resembles whole-rock melt. Melt veins (<2mm) are connected to narrower veinlets. Melt vein textures are similar to pegmatite textures showing chilled margins, a zone of inward-grown elongated crystals and central vugs, suggesting crystallization from supercooled melt. Sulfide-metal droplets indicate liquid immiscibility of both silicate and sulfide as well as sulfide and metal melts. Impact melting may have been an important factor for differentiation of primitive planetary bodies. Graphite associated with micrometer-sized melt inclusions in primary olivine was detected by Raman mapping. Carbon isotopic studies of graphite could be applied to test a possible presolar origin.
Y1  - 2017
U6  - https://doi.org/10.1111/maps.13027
SN  - 1086-9379
SN  - 1945-5100
VL  - 53
IS  - 3
SP  - 416
EP  - 432
PB  - Wiley
CY  - Hoboken
ER  -