2019
DOI: 10.1126/sciadv.aav8106
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New clues to ancient water on Itokawa

Abstract: We performed the first measurements of hydrogen isotopic composition and water content in nominally anhydrous minerals collected by the Hayabusa mission from the S-type asteroid Itokawa. The hydrogen isotopic composition (δD) of the measured pyroxene grains is −79 to −53‰, which is indistinguishable from that in chondritic meteorites, achondrites, and terrestrial rocks. Itokawa minerals contain water contents of 698 to 988 parts per million (ppm) weight, after correcting for water loss during parent body proce… Show more

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Cited by 59 publications
(35 citation statements)
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“…4). While the H2O/δD systematic of the albite (993 ± 252 ppm (2σ) with δD value of −177 ± 128‰) matches the values of Itokawa pyroxenes measured previously11 , olivine and pyroxene exhibit different isotopic signatures. The water contents of olivine and pyroxene are much lower, 235 ± 60 ppm and 278 ± 14 ppm, respectively, which are comparable to that of olivines reported in ordinary chondrite Bishunpur chondrules (76−326 ppm)31 .…”
supporting
confidence: 87%
See 1 more Smart Citation
“…4). While the H2O/δD systematic of the albite (993 ± 252 ppm (2σ) with δD value of −177 ± 128‰) matches the values of Itokawa pyroxenes measured previously11 , olivine and pyroxene exhibit different isotopic signatures. The water contents of olivine and pyroxene are much lower, 235 ± 60 ppm and 278 ± 14 ppm, respectively, which are comparable to that of olivines reported in ordinary chondrite Bishunpur chondrules (76−326 ppm)31 .…”
supporting
confidence: 87%
“…Parent body metamorphism in ordinary chondrites has also been shown to dramatically alter the elemental and isotopic compositions of the containing organic matter, perplexing the interpretation of the organic content of Itokawa 4 , whose rocks have experienced some degree of thermal metamorphism 3 . The water contents of the nominally anhydrous minerals (NAMs) of two Itokawa particles have recently been determined to be 698-988 parts per million (ppm), which equates to a water content of 160-510 ppm for the entire Itokawa asteroid 11 . This estimated water content is at the higher end of the range estimated for inner solar system bodies (e.g., 30-300 ppm for S-type asteroids based on remote observations of 433 Eros and 1036 Ganymede 12 ; 250-350 ppm for L and LL chondrites based on laboratory measurements 13 ; 3-84 ppm in the bulk silicate Moon), except for Earth and possibly Venus which contain up to 3000 ppm of water in their bulk silicate 14 .…”
Section: Main Textmentioning
confidence: 99%
“…Parent body metamorphism in ordinary chondrites has also been shown to dramatically alter the elemental and isotopic compositions of the containing organic matter, perplexing the interpretation of the organic content of Itokawa 6 , whose rocks have experienced some degree of thermal metamorphism 3 . The water contents of the nominally anhydrous minerals (NAMs) of two Itokawa particles have recently been determined to be 698–988 parts per million (ppm), which equates to a water content of 160–510 ppm for the entire Itokawa asteroid 15 . This estimated water content is at the higher end of the range estimated for inner solar system bodies (e.g., 30–300 ppm for S-type asteroids based on remote observations of 433 Eros and 1036 Ganymede 16 ; 250‒350 ppm for L and LL chondrites based on laboratory measurements 17 ; 3–84 ppm in the bulk silicate Moon), except for Earth and possibly Venus which contain up to 3000 ppm of water in their bulk silicate 18 .…”
Section: Introductionmentioning
confidence: 99%
“…While these missions returned extremely limited amounts of material, they clearly demonstrate that major scientific breakthroughs can be achieved, even with very small samples (e.g. Matzel et al 2010;McKeegan et al 2011;Jin and Bose 2019). Current asteroid sample return missions OSIRIS-REx (Lauretta et al 2017) and Hayabusa2 (Watanabe et al 2017) are planning to return > 60 g and > 1 g of surface materials from asteroids Bennu and Ryugu, respectively.…”
Section: How Much Sample Materials Needs To Be Collected?mentioning
confidence: 99%