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Solar system composition12/9/2023 ![]() Evidence for an early nitrogen isotopic evolution in the solar nebula from volatile analyses of a CAI from the CV3 chondrite NWA 8616. Nitrogen and carbon isotopic composition of the Sun inferred from a high-temperature solar nebula condensate. Oxygen isotopes in the early protoplanetary disk inferred from pyroxene in a classical type B CAI. Oxygen isotope exchange between refractory inclusion in Allende and solar nebula gas. Kinetic D/H fractionation during hydration and dehydration of silicate glasses, melts and nominally anhydrous minerals. Earth’s water may have been inherited from material similar to enstatite chondrite meteorites. Water in type I chondrules of Paris CM chondrite. NanoSIMS imaging of D/H ratios on FIB sections. Alteration phases in the E101.1 compound CAI: evidence of nebular processes? Meteorit. O, Mg, and Si isotope distributions in the complex ultra-refractory CAI Efremovka 101.1: assimilation of ultra-refractory, FUN, and regular CAI precursors. Efremovka 101.1: a CAI with ultrarefractory REE patterns and enormous enrichments of Sc, Zr and Y in fassaite and perovskite. Determination of the petrologic type of CV3 chondrites by Raman spectroscopy of included organic matter. in Meteorites and Cosmochemical Processes Treatise on Geochemistry Vol. The absolute chronology and thermal processing of solids in the solar protoplanetary disk. ![]() Making the planetary material diversity during the early assembling of the solar system. The D/H ratio of water in the solar nebula during its formation and evolution. The ancient heritage of water ice in the solar system. Water transport in protoplanetary disks and the hydrogen isotopic composition of chondrites. ![]() Structure and transport in the solar nebula from constraints on deuterium enrichment and giant planets formation. We propose that the isotopic composition of inner Solar System water was established during the collapse of the protosolar cloud core owing to a massive admixture of interstellar water. Hydrogen isotopes also correlate with oxygen and nitrogen isotopes, indicating that planetary reservoirs of volatile elements formed within the first 2 × 10 5 years of the Solar System, during the main CAI formation epoch. Minerals rich in oxidised iron formed before the capture of the fragments record the existence of a nebular gas reservoir with an oxygen fugacity substantially above the solar value and a D/H ratio within 20% of that of the Earth’s oceans. Primary minerals have extremely low D/H ratios, with δD values down to −850‰, recording the trapping of nebular hydrogen. We report the hydrogen isotopic composition of nominally anhydrous minerals from CAI fragments trapped in a once-melted host CAI. Here we use the isotopic composition of hydrogen in calcium–aluminium-rich inclusions (CAIs) from primitive meteorites, the oldest Solar System rocks, to establish the hydrogen isotopic composition of water at the onset of Solar System formation. The initial isotopic composition of water in the Solar System is of paramount importance to understanding the origin of water on planetary bodies but remains unknown, despite numerous studies 1, 2, 3, 4, 5.
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