Here we report the isotopic composition of 10 olivine grains isolated in the fine-grained material of three particles of OREX-800045-107.

This material is supported by the French Centre national d'études spatiales (CNES).

Oxygen isotopic compositions of olivine and carbonate in OREX-800045-107

Here we report the isotopic composition of 7 olivine and 8 carbonate grains isolated in the fine-grained material of three particles of OREX-800045-103.

Oxygen isotopic compositions of olivine and carbonate in OREX-800045-103

The dataset includes numbers of atoms of 132Xe and isotope ratios of the other xenon isotopes to 132Xe for each of a series of laser step heating analyses of the sample.  Xenon was released from the sample and admitted into the RELAX (Refrigerator Enhanced Laser Analyser for Xenon) time-of-flight, resonance ionization mass spectrometer at the University of Manchester for xenon isotopic analysis.  56 distinct, sequentially increasing temperature steps were analysed and calibrated with reference to air aliquots and blanks. Temperature was increased by increasing the power delivered to the sample by a fiber laser.  The purpose of the dataset is to test Hypothesis 4 of the OSIRIS-REx Sample Analysis Plan.  The data reveal a bulk xenon isotopic composition similar to Average Carbonaceous Chondrite Xenon, consisting of Q-Xe with excesses of 134Xe and 136Xe consistent with the presence of presolar nanodiamonds hosting Xe-HL; the presence of presolar material supports Hypotheses 3.2: Bennu contains dust grains that condensed in the gaseous envelopes around ancient stars or the ejecta of novae or supernovae (Lauretta et al. 2015) and 4.3: The initial constituents of Bennu’s parent asteroid were materials that were inherited from the protosolar molecular cloud or were formed and altered in the protoplanetary disk, largely composed of: presolar grains, chondrules, refractory inclusions, crystalline and amorphous silicates, metals, sulfides, oxides, phosphates, organic compounds (SOM and IOM), ices (e.g., H2O, CO2, NH3, etc.),  The close similarity of bulk xenon signature to AVCC supports Hypothesis 4.4: Bennu’s parent asteroid accreted in the outer protoplanetary disk, beyond Jupiter, as recorded by distinct isotopic anomalies in a variety of elements (e.g., O, Ca, Ti, Cr, Ni, Zr, Mo, Ru, Pd, Ba, Nd, etc.) (Rowe et al. 1994; McKeegan et al. 1998; Trinquier et al. 2007; Leya et al. 2008; Warren 2011; Connelly et al. 2012; Kruijer et al. 2020; Mezger et al. 2020; Schrader et al. 2020). The presence of excess 129Xe from decay of 129I (half life 16 Myr) in low temperature releases supports Hypothesis 4.1 The initial constituents of Bennu’s parent asteroid formed over several million years of solar system history, starting at a t0 of 4.567 Gyr (Kita et al. 2013; Pape et al. 2019; Connelly et al. 2012) and Hypothesis 5.1: Bennu’s parent asteroid was heated by the decay of short-lived radionuclides for ~10 Myr after accretion (e.g., Miyamoto 1991; Steele et al. 2017).

Science and Technology Facilities Council (UK) ST/V000675/1 and ST/Y002369/1

Xenon Isotopic Analysis of OSIRIS REx sample 803060-0

Data for major and trace elemental abundances

Concentration data

The dataset contains ion chromatography measurements of phosphate in acid hydrolyzed washes from Bennu, Murchison, fused silica samples, and procedural blank.

This material is supported by NASA under contract NNM10AA11C issued through the New Frontiers program.

IC anion analysis of acid hydrolyzed washes

The dataset contains ion chromatography measurements of chloride and sulfate in acid hydrolyzed washes from Bennu, Murchison, fused silica samples, and procedural blank.

Data for Ti isotopes on OREX-803015-101_1

Ti isotope data

Here, we report the mass-independent Ti isotope composition of the Bennu quick-look sample OREX-501018-100. We also present data for the terrestrial standard BHVO-2 and the CM2 chondrite Aguas Zarcas, which were used to monitor data quality. Mass-independent isotope analyses were carried out at ETH Zurich (Switzerland) using a Neptune Plus MC-ICP-MS. The composition of Bennu is 0.26 ± 0.18 (±2SE; n=4), 0.03 ± 0.07 and 1.94 ± 0.16 for ε46Ti/47Ti, ε48Ti/47Ti and ε50Ti/47Ti, respectively. The Ti isotope data of Bennu overlaps with that of CI chondrites and Ryugu. Therefore, the composition of Bennu closely resembles our best estimate of the initial composition of the solar system. This confirms the mission hypothesis that Bennu formed in the carbonaceous reservoir, which consists of material that originated beyond the snowline.

Astromat

Oxygen isotopic compositions of olivine and carbonate in OREX-800045-107

Oxygen isotopic compositions of olivine and carbonate in OREX-800045-107

Oxygen isotopic compositions of olivine and carbonate in OREX-800045-103

Oxygen isotopic compositions of olivine and carbonate in OREX-800045-103

Xenon Isotopic Analysis of OSIRIS REx sample 803060-0

Xenon Isotopic Analysis of OSIRIS REx sample 803060-0

Concentration data

Concentration data

IC anion analysis of acid hydrolyzed washes

IC anion analysis of acid hydrolyzed washes

Ti isotope data

Ti isotope data

MC-ICP-MS mass-independent Ti isotope analyses of aggregate sample OREX_803015-100

MC-ICP-MS mass-independent Ti isotope analyses of aggregate sample OREX_803015-100

MC-ICP-MS mass-independent Ti isotope analyses of aggregate sample OREX_803015-100

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