Universität zu Köln

Barosch, Jens ORCID: 0000-0002-0651-7348, Hezel, Dominik C., Marrocchi, Yves ORCID: 0000-0001-7075-3698, Gurenko, Andrey and Lenting, Christoph ORCID: 0000-0001-8374-5857 (2020). An unusual compound object in Yamato 793408 (H3.2-an): The missing link between compound chondrules and macrochondrules? Meteorit. Planet. Sci., 55 (7). S. 1458 - 1471. HOBOKEN: WILEY. ISSN 1945-5100

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Abstract

We found a large (similar to 2 mm) compound object in the primitive Yamato 793408 (H3.2-an) chondrite. It consists mostly of microcrystalline material, similar to chondrule mesostasis, that hosts an intact barred olivine (BO) chondrule. The object contains euhedral pyroxene and large individual olivine grains. Some olivine cores are indicative of refractory forsterites with very low Fe- and high Ca, Al-concentrations, although no O-16 enrichment. The entire object is most likely a new and unique type, as no similar compound object has been described so far. We propose that it represents an intermediate stage between compound chondrules and macrochondrules, and formed from the collision between chondrules at low velocities (below 1 m s(-1)) at high temperatures (around 1550 degrees C). The macrochondrule also trapped and preserved a smaller BO chondrule. This object appears to be the first direct evidence for a genetic link between compound chondrules and macrochondrules. In accordance with previous suggestions and studies, compound chondrules and macrochondrules likely formed by the same mechanism of chondrule collisions, and each represents different formation conditions, such as ambient temperature and collision speed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Barosch, Jens UNSPECIFIED orcid.org/0000-0002-0651-7348 UNSPECIFIED Hezel, Dominik C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marrocchi, Yves UNSPECIFIED orcid.org/0000-0001-7075-3698 UNSPECIFIED Gurenko, Andrey UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenting, Christoph UNSPECIFIED orcid.org/0000-0001-8374-5857 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-330561
DOI:	10.1111/maps.13496
Journal or Publication Title:	Meteorit. Planet. Sci.
Volume:	55
Number:	7
Page Range:	S. 1458 - 1471
Date:	2020
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1945-5100
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language VIBRATIONAL NORMAL-MODES; ORDINARY CHONDRITES; OXYGEN-ISOTOPE; UNEQUILIBRATED ORDINARY; CLASTS; FORSTERITE; ORIGIN; MELT; CONSTRAINTS; CHEMISTRY Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33056