Tanaka, Ryoji & Nakamura, Eizo (2017) Silicate-SiO reaction in a protoplanetary disk recorded by oxygen isotopes in chondrules, Nature Astronomy, 1, 0137, doi: 10.1038/s41550-017-0137. < 20200325111340-443154 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    The formation of planetesimals and planetary embryos during the earliest stages of the solar protoplanetary disk largely determined the composition and structure of the terrestrial planets. Within a few million years of the birth of the Solar System, chondrule formation and the accretion of the parent bodies of differentiated achondrites and the terrestrial planets took place in the inner protoplanetary disk. Here we show that, for chondrules in unequilibrated enstatite chondrites, high-precision Δ17O values (where Δ17O is the deviation of the δ17O value from a terrestrial silicate fractionation line) vary significantly (ranging from −0.49 to +0.84‰) and fall on an array with a steep slope of 1.27 on a three-oxygen-isotope plot. This array can be explained by the reaction between an olivine-rich chondrule melt and an SiO-rich gas derived from vaporized dust and nebular gas. Our study suggests that a large proportion of the building blocks of planetary embryos formed by successive silicate–gas interaction processes: silicate–H2O followed by silicate–SiO interactions under more oxidized and reduced conditions, respectively, within a few million years of the formation of the Solar System.

  • doi: 10.1038/s41550-017-0137
  • modified at 17 h ago
Sahara 97103 < 20110203174950-308-353 >pub
  • classification: chondrite:enstatite
  • physical-form: powder
  • status: (unknown)
  • description: Pulverized by Marian
  • modified at 2020-03-25
Eagle < 20110203165130-611-312 >pub
  • classification: chondrite:enstatite
  • physical-form: powder
  • status: (unknown)
  • description: Pulverized by Marian
  • modified at 2020-03-25
NWA 1222 (a) < 20110205103129-336-399 >pub
  • classification: chondrite:enstatite
  • physical-form: powder
  • status: (unknown)
  • description: Pulverized by Marian Selorm Sapah
  • modified at 2020-03-25
20071204 5 thumb Hvittis < 20071216130917.en >pub
  • classification: chondrite:enstatite
  • physical-form: aliquot
  • status: (unknown)
  • description: EL6; Original weight: unknown; Price: unknown;Five pieces are contained in a plastic bottle. Zhao collection. Leave Meteorites 0 <20120119113950-135-463> and enter A box 3 <20120629092538-109-918> on 2016-02-19.
  • modified at 2020-04-30
20071204 9 thumb Indarch < 20071216132000.en >pub
  • classification: chondrite:enstatite
  • physical-form: aliquot
  • status: (unknown)
  • description: EH4; Original weight: unknown; Price: unknown;A piece is contained in a plastic bottle. Zhao collection. Leave Meteorites 0 <20120119113950-135-463> and enter A box 3 <20120629092538-109-918> on 2016-02-19.
  • modified at 2020-04-30
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binder of Silicate-SiO reaction in a protoplanetary disk recorded by oxygen isotopes in chondrules pub container 20200325135653-469594
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Hvittis pub TIMS Thermo-Fisher MAT261 3 20200214145302-084540
Indarch pub TIMS Thermo-Fisher MAT261 3 20200214145302-105205
Sahara 97103-WR pub SIRA Thermo-Fisher MAT253 3 20200325120351-197783
Sahara 97103-Ch1 pub SIRA Thermo-Fisher MAT253 3 20200325120351-339442
Sahara 97103-Ch comp1 pub SIRA Thermo-Fisher MAT253 3 20200325120351-348908
Sahara 97103-Ch comp2 pub SIRA Thermo-Fisher MAT253 3 20200325120351-962110
Sahara 97103-En1 pub SIRA Thermo-Fisher MAT253 3 20200325120352-767592
Sahara 97103-En2 pub SIRA Thermo-Fisher MAT253 3 20200325120352-984626
Sahara 97103-En3 pub SIRA Thermo-Fisher MAT253 3 20200325120352-832290
Sahara 97103-En4 pub SIRA Thermo-Fisher MAT253 3 20200325120352-795426
Indarch-WR pub SIRA Thermo-Fisher MAT253 3 20200325120352-975823
Indarch-WR (EATG) pub SIRA Thermo-Fisher MAT253 3 20200325120352-736193
Indarch-Ch1 pub SIRA Thermo-Fisher MAT253 3 20200325120352-168262
Indarch-Ch2 pub SIRA Thermo-Fisher MAT253 3 20200325120352-354405
Indarch-Ch3 pub SIRA Thermo-Fisher MAT253 3 20200325120353-222624
Indarch-Ch4 pub SIRA Thermo-Fisher MAT253 3 20200325120353-097808
Indarch-Ch5 pub SIRA Thermo-Fisher MAT253 3 20200325120353-389454
Indarch-Ch6 pub SIRA Thermo-Fisher MAT253 3 20200325120353-189078
Indarch-Ch comp1 pub SIRA Thermo-Fisher MAT253 3 20200325120353-596278
Indarch-Ch comp2 pub SIRA Thermo-Fisher MAT253 3 20200325120353-945668
Indarch-Ch comp3 pub SIRA Thermo-Fisher MAT253 3 20200325120353-430249
Indarch-Ch comp4 pub SIRA Thermo-Fisher MAT253 3 20200325120353-752977
Indarch-Ch comp5 pub SIRA Thermo-Fisher MAT253 3 20200325120353-314020
Indarch-Ch comp6 pub SIRA Thermo-Fisher MAT253 3 20200325120353-809976
Indarch-Ch comp7 pub SIRA Thermo-Fisher MAT253 3 20200325120353-756627
Indarch-En1 pub SIRA Thermo-Fisher MAT253 3 20200325120354-152713
Indarch-En2 pub SIRA Thermo-Fisher MAT253 3 20200325120354-519035
Indarch-En3 pub SIRA Thermo-Fisher MAT253 3 20200325120354-265664
Indarch-En4 pub SIRA Thermo-Fisher MAT253 3 20200325120354-835736
NWA 1222-WR pub SIRA Thermo-Fisher MAT253 3 20200325120354-782569
NWA 1222-En1 pub SIRA Thermo-Fisher MAT253 3 20200325120354-049570
NWA 1222-En2 pub SIRA Thermo-Fisher MAT253 3 20200325120354-877828
Eagle-WR pub SIRA Thermo-Fisher MAT253 3 20200325120354-753590
Eagle-En1 pub SIRA Thermo-Fisher MAT253 3 20200325120354-273600
Eagle-En2 pub SIRA Thermo-Fisher MAT253 3 20200325120354-508235
Hvittis-WR pub SIRA Thermo-Fisher MAT253 3 20200325120355-174714
Hvittis-En1 pub SIRA Thermo-Fisher MAT253 3 20200325120355-869992
Hvittis-En2 pub SIRA Thermo-Fisher MAT253 3 20200325120355-272345
name spots global-id
caption ID assembly stone
Supplementary Table 1-2. Oxygen isotopic composition of chondrules and enstatite separates in EH3, EH4, EH5, EH6, EL5, and EL6 chondrites. pub 20200325120700-789708 oxygen (Itokawa Table S3) 36
manual
  • name
  • Tanaka, Ryoji
  • Nakamura, Eizo