REE patterns of eucrites and their genetic implications |
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| Institution: | 1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China;2. Université d''Orléans – CNRS/INSU – ISTO – BRGM, UMR 7327, Orléans, France;1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. School of Earth and Planetary Science, University of Chinese Academy of Sciences, Beijing 100049, China;1. Laboratoire G-Time, Université Libre de Bruxelles, CP 160/02, 50, Av. F.D. Roosevelt, 1050 Brussels, Belgium;2. Department of Earth and Planetary Sciences, University of California at Davis, Davis, CA 95616, USA;1. Geosciences Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA;2. Department of Geosciences, Penn State University, State College, PA 16803, USA;3. Department of Natural History, Royal Ontario Museum, Toronto M5S 2C6, Canada;4. Institut de Physique du Globe de Paris, Université Paris Diderot, Institut Universitaire de France, Paris, France;5. Geophysical Laboratory, Carnegie Institution for Science, Washington DC 20015, USA;6. Planetary Geosciences Institute, Department of Earth & Planetary Sciences, University of Tennessee, Knoxville, TN 37996, USA |
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| Abstract: | Rare earth element (REE) abundances in eucrites were precisely determined on Juvinas, Pasamonte, Cachari, Stannem and Antarctic eucrites Y-74450,63,D+G; Y-75015,20,E+F; Y-75011,73; Y-790007,61,F; Y-75011,84,D-1 and Y-790007,61,E-4. The last two samples are eucrite clasts from polymict eucrites. The other Antarctic eucrite samples are matrix from polymict eucrites.Like the Stannern eucrite, all of the Antarctic eucrites have relatively high REE abundances. REE abundances in two clast samples are higher than those in the Stannern and matrix samples of the Antarctic eucrites. When REE abundances in the Antarctic eucrites and the Stannem eucrite are normalized by the REE abundance suite of the Juvinas or Pasamonte eucrites, highly linear REE patterns are obtained. For the Juvinas- or Pasamonte-normalized REE patterns of the Antarctic and Stannern eucrites, the inclination of the linear REE patterns increases with increasing REE abundances. These observations suggest that the eucrites with larger REE abundances such as the Stannern and Antarctic eucrites were produced as residual liquid in a fractional crystallization process from the main group of eucrites (e.g., the Juvinas eucrite). On the other hand, the Moore County cumulate eucrite is considered to be a solid phase formed in this process. |
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