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Redistribution of Sr and rare earth elements in the matrices of CV3 carbonaceous chondrites during aqueous alteration in their parent body

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Title
Redistribution of Sr and rare earth elements in the matrices of CV3 carbonaceous chondrites during aqueous alteration in their parent body
Other Titles
모천체 수성변질에 의한 CV3 콘드라이트 기질내 Sr과 희토류 원소의 재분포
Authors
JOGOKAORI
Lee, Jong Ik
Sachio Kobayashi
Tomoki Nakamura
Motoo Ito
Keywords
CV3 carbonaceous chondrite; Rare earth element; aqueous alteration
Issue Date
2018
Citation
JOGOKAORI, et al. 2018. "Redistribution of Sr and rare earth elements in the matrices of CV3 carbonaceous chondrites during aqueous alteration in their parent body". EARTH PLANETS AND SPACE, 70(1): 37-45.
Abstract
We measured the abundances of Sr and rare earth elements (REEs) in the matrices of five CV3 carbonaceous chondrites:;Meteorite Hills (MET) 00430, MET 01070, La Paz icefield (LAP) 02206, Asuka (A) 881317 and Roberts Massif (RBT) 04143. In the MET 00430 and MET 01074 matrices, the 23 Sr/CI and light REE (LREE, La-Nd)/CI ratios positively correlate with the amounts of Ca-rich secondary minerals, which formed during aqueous alteration in the CV3 chondrite parent body. In contrast, in the LAP 02206 and RBT 04143 matrices, although the Sr/CI ratios correlate with the amounts of Ca-rich secondary minerals, the LREE/CI ratios vary independently from the amounts of any secondary minerals. This suggests that the LREE/CI ratios in these matrices would bewere produced prior to the parent body alteration, probably in the solar nebula. The LREE/CI ratios of the LAP 02206 and RBT 04143 matrices reveal the mixing process of matrix minerals prior to the accretion of the CV3 chondrite parent body. The mixing degrees of matrix minerals might be different between these two matrices. Because solid materials would be mixed with over time according to the radial diffusion model of a turbulent disk, the matrix minerals consisting of LAP 02206 and RBT 04143 matrices might be incorporated into their parent body at with different timing.
URI
http://repository.kopri.re.kr/handle/201206/7519
DOI
http://dx.doi.org/10.1186/s40623-018-0809-5
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