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Water-susceptible primordial noble gas components in less-altered CR chondrites: A possible link to cometary materials

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Title
Water-susceptible primordial noble gas components in less-altered CR chondrites: A possible link to cometary materials
Other Titles
CR 콘드라이트의 원시 불활성기체 성분: 혜성 구성물질과의 연관성
Authors
Obase, Tomoya
Nakashima, Daisuke
Choi, Jisu
Enokido, Yuma
Matsumoto, Megumi
Nakamura, Tomoki
Subject
Geochemistry & Geophysics
Keywords
Aqueous alterationCR chondritesNoble gasesPrimitive meteorites
Issue Date
2021-11-01
Citation
Obase, Tomoya, et al. 2021. "Water-susceptible primordial noble gas components in less-altered CR chondrites: A possible link to cometary materials". GEOCHIMICA ET COSMOCHIMICA ACTA, 312: 75-105.
Abstract
We report detailed characterizations of the petrology, mineralogy, and noble gas signatures of Renazzo-type (CR) chondrites EET 92048, MIL 090657, NWA 801, and hydrothermally treated MIL 090657 samples to investigate primordial noble gases hosted by water-susceptible materials in aqueously less-altered CR chondrites. The noble gases were extracted by a stepwise heating method. The hydrothermal treatment on MIL 090657 resulted in the alteration of amorphous silicates in the matrix and the removal of large amounts of He and Ne that were released at low temperature from the untreated sample. The Ar-36/Xe-132 ratios in EET 92048 and MIL 090657 are similar to 5 times higher than that of the Q noble gas component, although both meteorites do not show any evidence for solar wind noble gases. The analyses revealed that aqueously less-altered CR chondrites contain two distinct primordial noble gas components hosted by water-susceptible materials: an isotopically Q-like Ne-rich component and an Ar-rich component. The characteristics of the Q-like Ne-rich component are consistent with those of Q-like Ne in cometary materials. We propose that the CR chondrites formed at a greater heliocentric distance and share similar materials hosting the Q-like Ne-rich component with comets. The presence of the Ar-rich component in the CR chondrites, as well as in ordinary chondrites and other anhydrous carbonaceous chondrites, provides evidence of the global distribution of the Ar-rich carriers in the ordinary and carbonaceous chondrite forming regions. (C) 2021 Elsevier Ltd. All rights reserved.
URI
https://repository.kopri.re.kr/handle/201206/13016
DOI
http://dx.doi.org/10.1016/j.gca.2021.08.012
Type
Article
Station
해당사항없음
Indexed
SCIE
Appears in Collections  
2021-2021, Mantle dynamics and tectonic evolutions of Zealandia-Antarctic domain (21-21) / Park, Sung Hyun (PE21050)
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