Young asteroidal fluid activity revealed by absolute age from apatite in carbonaceous chondrite

Ai-Cheng Zhang (), Qiu-Li Li, Hisayoshi Yurimoto, Naoya Sakamoto, Xian-Hua Li, Sen Hu, Yang-Ting Lin and Ru-Cheng Wang
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Ai-Cheng Zhang: State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University
Qiu-Li Li: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences
Hisayoshi Yurimoto: Hokkaido University
Naoya Sakamoto: Isotope Imaging Laboratory, Creative Research Institution Sousei, Hokkaido University
Xian-Hua Li: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences
Sen Hu: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Yang-Ting Lin: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
Ru-Cheng Wang: State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Chondritic meteorites, consisting of the materials that have formed in the early solar system (ESS), have been affected by late thermal events and fluid activity to various degrees. Determining the timing of fluid activity in ESS is of fundamental importance for understanding the nature, formation, evolution and significance of fluid activity in ESS. Previous investigations have determined the relative ages of fluid activity with short-lived isotope systematics. Here we report an absolute 207Pb/206Pb isochron age (4,450±50 Ma) of apatite from Dar al Gani (DaG) 978, a type ∼3.5, ungrouped carbonaceous chondrite. The petrographic, mineralogical and geochemical features suggest that the apatite in DaG 978 should have formed during metamorphism in the presence of a fluid. Therefore, the apatite age represents an absolute age for fluid activity in an asteroidal setting. An impact event could have provided the heat to activate this young fluid activity in ESS.

Date: 2016
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DOI: 10.1038/ncomms12844

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