Variable refractory lithophile element compositions of planetary building blocks: Insights from components of enstatite chondrites
نویسندگان
چکیده
Chondrites are sediments of materials left over from the earliest stage solar system history. Based on their undifferentiated nature and less fractionated chemical compositions, chondrites widely considered to represent unprocessed building blocks terrestrial planets embryos. Models composition generally find chondritic relative abundances refractory lithophile elements (RLE) in bulk bodies ("constant RLE ratio rule"), based limited variations ratios among meteorites photosphere. Here, we show that RLE, such as Nb/Ta, Zr/Hf, Sm/Nd Al/Ti, value chondrules enstatite (EC). The individual EC document different chalcophile affinities under highly reducing environments a separation RLE-bearing sulfides silicates before and/or during chondrule formation. In contrast, have solar-like ratios, indicating physical sorting was negligible accretion parent bodies. Likewise, if Earth's were dominated by EC-like materials, supported multiple isotope systematics, accretionary disk should not occurred blocks. Alternatively, precursors might been high-temperature nebular condensed fractionation due precipitation sulfides...Highly reduced experienced selective removal or metal/sulfide phases, Mercury, fractionated, non-solar ratios.
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2021
ISSN: ['1872-9533', '0016-7037']
DOI: https://doi.org/10.1016/j.gca.2021.05.057