Universität zu Köln

Metzler, Knut, Hezel, Dominik C., Barosch, Jens ORCID: 0000-0002-0651-7348, Woelfer, Elias, Schneider, Jonas M., Hellmann, Jan L. ORCID: 0000-0001-5365-492X, Berndt, Jasper, Stracke, Andreas ORCID: 0000-0002-9719-4213, Gattacceca, Jerome ORCID: 0000-0002-1639-7140, Greenwood, Richard C., Franchi, Ian A., Burkhardt, Christoph and Kleine, Thorsten (2021). The Loongana (CL) group of carbonaceous chondrites. Geochim. Cosmochim. Acta, 304. S. 1 - 32. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1872-9533

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Abstract

A coordinated study of the petrology, mineral chemistry, and bulk chemical and isotopic composition of the five ungrouped carbonaceous chondrites Coolidge, Loongana 001, Los Vientos (LoV) 051, Northwest Africa (NWA) 033, and NWA 13400 reveals that these meteorites have a similar set of properties that distinguishes them from the other carbonaceous chondrite groups and allows definition of the new Loongana (CL) group of carbonaceous chondrites. The basic characteristics of the investigated samples are: (1) Lithophile element ratios (e.g., Al/Mg, Si/Mg) are within the typical range of other carbonaceous chondrite groups. (2) Fe-Ni metal abundances are considerably higher than for CV, but similar to CR chondrites. (3) Chondrule size-frequency distributions are similar to CV, but dissimilar to CR chondrites. (4) The mean CAI abundance is similar to 1.4 vol%, i.e., lower than in CV but much higher than in CR chondrites. (5) Very low amounts of matrix (17-21 vol%), the lowest among the main carbonaceous chondrite groups (CI, CM, CO, CV, CR, CK). (6) Olivine is nearly equilibrated, with mean fayalite (Fa) values between 12.5 mol% (Loongana 001) and 14.7 mol% (NWA 13400) as a metamorphic effect. (7) Lower Al2O3 and higher MgO and Cr2O3 concentrations in matrix, compared to matrix in CV, CK, and CR chondrites. (8) Volatile elements (Mn, Na, K, Rb, Cs, Zn, Se, Te, Pb, Tl) are considerably depleted compared to all other main carbonaceous chondrite groups, reflecting the low matrix abundance. (9) Bulk O isotope compositions plot along the CCAM line (Delta O-17 -3.96 to -5.47 parts per thousand), partly overlapping with the CV and CK chondrite fields but including samples that are more O-16-rich. (10) Unique positions of CL values in the epsilon Cr-54-epsilon Ti-50 isotope plot, with epsilon Cr-54 values similar to CV, CK, and CO, but epsilon Ti-50 values similar to CR chondrites. All CL chondrites studied here are of petrologic type 3.9 to 4, indicating that they have been thermally metamorphosed on the parent body. The diagnostic features of CL chondrites detailed here provide a basis for identifying CL members of lower petrologic types. Such samples will be important for determining the pristine state of these meteorites and their components. (C) 2021 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Metzler, Knut UNSPECIFIED UNSPECIFIED UNSPECIFIED Hezel, Dominik C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barosch, Jens UNSPECIFIED orcid.org/0000-0002-0651-7348 UNSPECIFIED Woelfer, Elias UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, Jonas M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hellmann, Jan L. UNSPECIFIED orcid.org/0000-0001-5365-492X UNSPECIFIED Berndt, Jasper UNSPECIFIED UNSPECIFIED UNSPECIFIED Stracke, Andreas UNSPECIFIED orcid.org/0000-0002-9719-4213 UNSPECIFIED Gattacceca, Jerome UNSPECIFIED orcid.org/0000-0002-1639-7140 UNSPECIFIED Greenwood, Richard C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Franchi, Ian A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Burkhardt, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Kleine, Thorsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-592554
DOI:	10.1016/j.gca.2021.04.007
Journal or Publication Title:	Geochim. Cosmochim. Acta
Volume:	304
Page Range:	S. 1 - 32
Date:	2021
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1872-9533
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOLAR-SYSTEM ABUNDANCES; COMPOSITIONAL CLASSIFICATION; CONDENSATION TEMPERATURES; ISOTOPIC COMPOSITION; CHONDRULE FORMATION; SIZE DISTRIBUTIONS; CV3 CHONDRITES; TRACE-ELEMENTS; FRACTIONATION; METEORITES Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59255