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Title: THE CHROMIUM ISOTOPIC COMPOSITION OF THE UNGROUPED CARBONACEOUS CHONDRITE TAGISH LAKE

Abstract

Early solar materials bear a variety of isotopic anomalies that reflect compositional differences deriving from distinct stellar nucleosynthetic processes. As shown in previous studies, the stepwise dissolution with increasing acid strengths of bulk rock carbonaceous chondrites liberates Cr with both excesses and deficits in {sup 53}Cr and {sup 54}Cr relative to the terrestrial standard. The magnitude of the {sup 54}Cr variations within a meteorite decreases in the sequence CI1 > CR2 > CM2 > CV3 > CO3 > CK4 and correlates with the degree of metamorphism of each carbonaceous chondrite class. This study shows that the Tagish Lake meteorite presents the highest excesses in {sup 54}Cr ever measured in a bulk silicate phase. According to this study, the Tagish Lake meteorite is composed of the least re-equilibrated material known at this time. The magnitude of {sup 54}Cr variation decreases now in the following sequence: Tagish Lake (ungrouped CI2) > Orgueil (CI1) > Murchison (CM2) > Allende (CV2). Moreover, this study shows that excesses in {sup 53}Cr relative to Earth can be interpreted as representing the extent of aqueous alteration on meteorite parent bodies. Finally, the high {sup 54}Cr anomalies measured in this meteorite make Tagish Lake one of the majormore » targets to decipher the host of these anomalies.« less

Authors:
;  [1]; ;  [2]
  1. Laboratoire de Mineralogie et Cosmochimie du Museum (LMCM), CNRS and Museum National d'Histoire Naturelle, UMR 7202, 57 rue Cuvier, 75005 Paris (France)
  2. Laboratoire de Geochimie et Cosmochimie, Institut de Physique du Globe de Paris, Sorbonne Paris Cite, 1 rue Jussieu 75238, Paris cedex 05 (France)
Publication Date:
OSTI Identifier:
21578341
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/736/1/23; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHONDRITES; CHROMIUM; CHROMIUM 53; CHROMIUM 54; ISOTOPE RATIO; SUPERNOVAE; VARIATIONS; BINARY STARS; CHROMIUM ISOTOPES; DIMENSIONLESS NUMBERS; ELEMENTS; ERUPTIVE VARIABLE STARS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; INTERMEDIATE MASS NUCLEI; ISOTOPES; METALS; METEORITES; NUCLEI; STABLE ISOTOPES; STARS; STONE METEORITES; TRANSITION ELEMENTS; VARIABLE STARS

Citation Formats

Petitat, M., Gounelle, M., Birck, J.-L., and Luu, T. H., E-mail: mpetitat@gmail.com. THE CHROMIUM ISOTOPIC COMPOSITION OF THE UNGROUPED CARBONACEOUS CHONDRITE TAGISH LAKE. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/1/23.
Petitat, M., Gounelle, M., Birck, J.-L., & Luu, T. H., E-mail: mpetitat@gmail.com. THE CHROMIUM ISOTOPIC COMPOSITION OF THE UNGROUPED CARBONACEOUS CHONDRITE TAGISH LAKE. United States. doi:10.1088/0004-637X/736/1/23.
Petitat, M., Gounelle, M., Birck, J.-L., and Luu, T. H., E-mail: mpetitat@gmail.com. Wed . "THE CHROMIUM ISOTOPIC COMPOSITION OF THE UNGROUPED CARBONACEOUS CHONDRITE TAGISH LAKE". United States. doi:10.1088/0004-637X/736/1/23.
@article{osti_21578341,
title = {THE CHROMIUM ISOTOPIC COMPOSITION OF THE UNGROUPED CARBONACEOUS CHONDRITE TAGISH LAKE},
author = {Petitat, M. and Gounelle, M. and Birck, J.-L. and Luu, T. H., E-mail: mpetitat@gmail.com},
abstractNote = {Early solar materials bear a variety of isotopic anomalies that reflect compositional differences deriving from distinct stellar nucleosynthetic processes. As shown in previous studies, the stepwise dissolution with increasing acid strengths of bulk rock carbonaceous chondrites liberates Cr with both excesses and deficits in {sup 53}Cr and {sup 54}Cr relative to the terrestrial standard. The magnitude of the {sup 54}Cr variations within a meteorite decreases in the sequence CI1 > CR2 > CM2 > CV3 > CO3 > CK4 and correlates with the degree of metamorphism of each carbonaceous chondrite class. This study shows that the Tagish Lake meteorite presents the highest excesses in {sup 54}Cr ever measured in a bulk silicate phase. According to this study, the Tagish Lake meteorite is composed of the least re-equilibrated material known at this time. The magnitude of {sup 54}Cr variation decreases now in the following sequence: Tagish Lake (ungrouped CI2) > Orgueil (CI1) > Murchison (CM2) > Allende (CV2). Moreover, this study shows that excesses in {sup 53}Cr relative to Earth can be interpreted as representing the extent of aqueous alteration on meteorite parent bodies. Finally, the high {sup 54}Cr anomalies measured in this meteorite make Tagish Lake one of the major targets to decipher the host of these anomalies.},
doi = {10.1088/0004-637X/736/1/23},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 736,
place = {United States},
year = {2011},
month = {7}
}