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Title: Early aqueous activity on the ordinary and carbonaceous chondrite parent bodies recorded by fayalite

Here, chronology of aqueous activity on chondrite parent bodies constrains their accretion times and thermal histories. Radiometric 53Mn–53Cr dating has been successfully applied to aqueously formed carbonates in CM carbonaceous chondrites. Owing to the absence of carbonates in ordinary (H, L and LL), and CV and CO carbonaceous chondrites, and the lack of proper standards, there are no reliable ages of aqueous activity on their parent bodies. Here we report the first 53Mn–53Cr ages of aqueously formed fayalite in the L3 chondrite Elephant Moraine 90161 as 2.4 +1.8-1.3 Myr after calcium–aluminium-rich inclusions (CAIs), the oldest Solar System solids. In addition, measurements using our synthesized fayalite standard show that fayalite in the CV3 chondrite Asuka 881317 and CO3-like chondrite MacAlpine Hills 88107 formed and 4.2+0.8-0.7 Myr after CAIs, respectively. Thermal modelling, combined with the inferred conditions (temperature and water/rock ratio) and 53Mn–53Cr ages of aqueous alteration, suggests accretion of the L, CV and CO parent bodies ~1.8–2.5 Myr after CAIs.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Univ. of Hawai'i at Manoa, Honolulu, HI (United States). Hawai'i Institute of Geophysics and Planetology; Univ. of Hawai'i NASA Astrobiology Institute, Honolulu, HI (United States); Univ. of Cape Town, Rondebosh (South Africa). Dept. of Geological Sciences
  2. Univ. of Hawai'i at Manoa, Honolulu, HI (United States). Hawai'i Institute of Geophysics and Planetology; Univ. of Hawai'i NASA Astrobiology Institute, Honolulu, HI (United States); Korea Polar Research Institute, Incheon (Korea). Div. of Polar Earth-System Sciences
  3. Univ. of Hawai'i at Manoa, Honolulu, HI (United States). Hawai'i Institute of Geophysics and Planetology
  4. Univ. of Hawai'i at Manoa, Honolulu, HI (United States). Hawai'i Institute of Geophysics and Planetology; Univ. of Hawai'i NASA Astrobiology Institute, Honolulu, HI (United States)
  5. National Astronomical Observatory of Japan, Tokyo (Japan). Center for Computational Astrophysics
  6. Univ. of Chicago, Chicago, IL (United States). Dept. of the Geophysical Sciences
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Glenn Seaborg Institute
Publication Date:
OSTI Identifier:
1305856
Report Number(s):
LLNL-JRNL--666062
Journal ID: ISSN 2041-1723
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS