Extended chondrule formation intervals in distinct physicochemical environments: Evidence from Al-Mg isotope systematics of CR chondrite chondrules with unaltered plagioclase

Tenner, Travis J.; Nakashima, Daisuke; Ushikubo, Takayuki; Tomioka, Naotaka; Kimura, Makoto; Weisberg, Michael K.; Kita, Noriko T.

doi:10.1016/j.gca.2019.06.023

Title: Extended chondrule formation intervals in distinct physicochemical environments: Evidence from Al-Mg isotope systematics of CR chondrite chondrules with unaltered plagioclase

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Abstract

Al-Mg isotope systematics of twelve FeO-poor (type I) chondrules from CR chondrites Queen Alexandra Range 99177 and Meteorite Hills 00426 were investigated by secondary ion mass spectrometry (SIMS). Five chondrules with Mg#’s of 99.0 to 99.2 and Δ¹⁷O of -4.2‰ to -5.3‰ have resolvable excess ²⁶Mg. Their inferred (²⁶Al/²⁷Al)₀ values range from (3.5 ± 1.3) × 10^-6 to (6.0 ± 3.9) × 10^-6. This corresponds to formation times of 2.2 (–0.5/+1.1) Myr to 2.8 (-0.3/+0.5) Myr after CAIs, using a canonical (²⁶Al/²⁷Al)₀ of 5.23 × 10^-5, and assuming homogeneously distributed 26Al that yielded a uniform initial ²⁶Al/²⁷Al in the Solar System. Seven chondrules lack resolvable excess ²⁶Mg. They have lower Mg#’s (94.2 to 98.7) and generally higher Δ¹⁷O (-0.9‰ to -4.9‰) than chondrules with resolvable excess ²⁶Mg. Their inferred (²⁶Al/²⁷Al)₀ upper limits range from 1.3 × 10^-6 to 3.2 × 10^-6, corresponding to formation >2.9 to >3.7 Myr after CAIs. Al-Mg isochrons depend critically on chondrule plagioclase, and several characteristics indicate the chondrule plagioclase is unaltered: (1) SIMS ²⁷Al/²⁴Mg depth profile patterns match those from anorthite standards, and SEM/EDS of chondrule SIMS pits show no foreign inclusions; (2) transmission electron microscopy (TEM) reveals no nanometer-scale micro-inclusions and no alteration duemore »« less

Authors:

^[1];

^[2];

^[3];

^[4]; Kimura, Makoto ^[5]; Weisberg, Michael K. ^[6]; Kita, Noriko T. ^[7]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States); Tohoku Univ., Sendai (Japan)
Univ. of Wisconsin, Madison, WI (United States); Japan Agency for Marine-Earth Science and Technology, Kochi (Japan)
Japan Agency for Marine-Earth Science and Technology, Kochi (Japan)
Ibaraki Univ., Mito (Japan); National Inst. of Polar Research, Tokyo (Japan)
City Univ. (CUNY), Brooklyn, NY (United States); American Museum of Natural History (AMNH), New York, NY (United States)
Univ. of Wisconsin, Madison, WI (United States)

Publication Date:: Sat Jun 22 00:00:00 EDT 2019

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: National Aeronautics and Space Administration (NASA); USDOE

OSTI Identifier:: 1558210

Alternate Identifier(s):: OSTI ID: 1691895

Report Number(s):: LA-UR-18-30036
Journal ID: ISSN 0016-7037

Grant/Contract Number:: 89233218CNA000001; LA-UR-18-30036

Resource Type:: Accepted Manuscript

Journal Name:: Geochimica et Cosmochimica Acta

Additional Journal Information:: Journal Volume: 260; Journal Issue: C; Journal ID: ISSN 0016-7037

Publisher:: Elsevier; The Geochemical Society; The Meteoritical Society

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; Planetary Sciences

Citation Formats


                    Tenner, Travis J., Nakashima, Daisuke, Ushikubo, Takayuki, Tomioka, Naotaka, Kimura, Makoto, Weisberg, Michael K., and Kita, Noriko T. Extended chondrule formation intervals in distinct physicochemical environments: Evidence from Al-Mg isotope systematics of CR chondrite chondrules with unaltered plagioclase.  United States: N. p., 2019. 
Web.  doi:10.1016/j.gca.2019.06.023.

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                    Tenner, Travis J., Nakashima, Daisuke, Ushikubo, Takayuki, Tomioka, Naotaka, Kimura, Makoto, Weisberg, Michael K., & Kita, Noriko T. Extended chondrule formation intervals in distinct physicochemical environments: Evidence from Al-Mg isotope systematics of CR chondrite chondrules with unaltered plagioclase.  United States.  https://doi.org/10.1016/j.gca.2019.06.023

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                    Tenner, Travis J., Nakashima, Daisuke, Ushikubo, Takayuki, Tomioka, Naotaka, Kimura, Makoto, Weisberg, Michael K., and Kita, Noriko T. Sat .  
"Extended chondrule formation intervals in distinct physicochemical environments: Evidence from Al-Mg isotope systematics of CR chondrite chondrules with unaltered plagioclase".  United States.  https://doi.org/10.1016/j.gca.2019.06.023.  https://www.osti.gov/servlets/purl/1558210.

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@article{osti_1558210,

  title        = {Extended chondrule formation intervals in distinct physicochemical environments: Evidence from Al-Mg isotope systematics of CR chondrite chondrules with unaltered plagioclase},

  author       = {Tenner, Travis J. and Nakashima, Daisuke and Ushikubo, Takayuki and Tomioka, Naotaka and Kimura, Makoto and Weisberg, Michael K. and Kita, Noriko T.},

  abstractNote = {Al-Mg isotope systematics of twelve FeO-poor (type I) chondrules from CR chondrites Queen Alexandra Range 99177 and Meteorite Hills 00426 were investigated by secondary ion mass spectrometry (SIMS). Five chondrules with Mg#’s of 99.0 to 99.2 and Δ17O of -4.2‰ to -5.3‰ have resolvable excess 26Mg. Their inferred (26Al/27Al)0 values range from (3.5 ± 1.3) × 10-6 to (6.0 ± 3.9) × 10-6. This corresponds to formation times of 2.2 (–0.5/+1.1) Myr to 2.8 (-0.3/+0.5) Myr after CAIs, using a canonical (26Al/27Al)0 of 5.23 × 10-5, and assuming homogeneously distributed 26Al that yielded a uniform initial 26Al/27Al in the Solar System. Seven chondrules lack resolvable excess 26Mg. They have lower Mg#’s (94.2 to 98.7) and generally higher Δ17O (-0.9‰ to -4.9‰) than chondrules with resolvable excess 26Mg. Their inferred (26Al/27Al)0 upper limits range from 1.3 × 10-6 to 3.2 × 10-6, corresponding to formation >2.9 to >3.7 Myr after CAIs. Al-Mg isochrons depend critically on chondrule plagioclase, and several characteristics indicate the chondrule plagioclase is unaltered: (1) SIMS 27Al/24Mg depth profile patterns match those from anorthite standards, and SEM/EDS of chondrule SIMS pits show no foreign inclusions; (2) transmission electron microscopy (TEM) reveals no nanometer-scale micro-inclusions and no alteration due to thermal metamorphism; (3) oxygen isotopes of chondrule plagioclase match those of coexisting olivine and pyroxene, indicating a low extent of thermal metamorphism; and (4) electron microprobe data show chondrule plagioclase is anorthite-rich, with excess structural silica and high MgO, consistent with such plagioclase from other petrologic type 3.00-3.05 chondrites. We conclude that the resolvable (26Al/27Al)0 variabilities among chondrules studied are robust, corresponding to a formation interval of at least 1.1 Myr.},

  doi          = {10.1016/j.gca.2019.06.023},

  journal      = {Geochimica et Cosmochimica Acta},

  number       = C,

  volume       = 260,

  place        = {United States},

  year         = {Sat Jun 22 00:00:00 EDT 2019},

  month        = {Sat Jun 22 00:00:00 EDT 2019}

}

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