Lead and Mg isotopic age constraints on the evolution of the HED parent body

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Lead and Mg isotopic age constraints on the evolution of the HED parent body. / Schiller, Martin; Connelly, James N.; Bizzarro, Martin.

In: Meteoritics and Planetary Science, Vol. 52, No. 6, 2017, p. 1233-1243.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Schiller, M, Connelly, JN & Bizzarro, M 2017, 'Lead and Mg isotopic age constraints on the evolution of the HED parent body', Meteoritics and Planetary Science, vol. 52, no. 6, pp. 1233-1243. https://doi.org/10.1111/maps.12848

APA

Schiller, M., Connelly, J. N., & Bizzarro, M. (2017). Lead and Mg isotopic age constraints on the evolution of the HED parent body. Meteoritics and Planetary Science, 52(6), 1233-1243. https://doi.org/10.1111/maps.12848

Vancouver

Schiller M, Connelly JN, Bizzarro M. Lead and Mg isotopic age constraints on the evolution of the HED parent body. Meteoritics and Planetary Science. 2017;52(6):1233-1243. https://doi.org/10.1111/maps.12848

Author

Schiller, Martin ; Connelly, James N. ; Bizzarro, Martin. / Lead and Mg isotopic age constraints on the evolution of the HED parent body. In: Meteoritics and Planetary Science. 2017 ; Vol. 52, No. 6. pp. 1233-1243.

Bibtex

@article{f499a6fdee1d4f678d6e89def762606b,
title = "Lead and Mg isotopic age constraints on the evolution of the HED parent body",
abstract = "The large collection of howardite-eucrite-diogenite (HED) meteorites allows us to study the initial magmatic differentiation of a planetesimal. We report Pb-Pb ages of the unequilibrated North West Africa (NWA) 4215 and Dhofar 700 diogenite meteorites and their mass-independent 26Mg isotope compositions (26Mg*) to better understand the timing of differentiation and crystallization of their source reservoir(s). NWA 4215 defines a Pb-Pb age of 4484.5 ± 7.9 Myr and has a 26Mg* excess of +2.3 ± 1.6 ppm whereas Dhofar 700 has a Pb-Pb age of 4546.4 ± 4.7 Myr and a 26Mg* excess of +25.5 ± 1.9 ppm. We interpret the young age of NWA 4215 as a thermal overprint, but the age of Dhofar 700 is interpreted to represent a primary crystallization age. Combining our new data with published Mg isotope and trace element data suggests that approximately half of the diogenites for which such data are available crystallized within the first 1–2 Myr of our solar system, consistent with a short-lived, early-formed magma ocean undergoing convective cooling. The other half of the diogenites, including both NWA 4215 and Dhofar 700, are best explained by their crystallization in slowly cooled isolated magma chambers lasting over at least ~20 Myr.",
author = "Martin Schiller and Connelly, {James N.} and Martin Bizzarro",
year = "2017",
doi = "10.1111/maps.12848",
language = "English",
volume = "52",
pages = "1233--1243",
journal = "Meteoritics and Planetary Science",
issn = "1086-9379",
publisher = "JohnWiley & Sons, Inc.",
number = "6",

}

RIS

TY - JOUR

T1 - Lead and Mg isotopic age constraints on the evolution of the HED parent body

AU - Schiller, Martin

AU - Connelly, James N.

AU - Bizzarro, Martin

PY - 2017

Y1 - 2017

N2 - The large collection of howardite-eucrite-diogenite (HED) meteorites allows us to study the initial magmatic differentiation of a planetesimal. We report Pb-Pb ages of the unequilibrated North West Africa (NWA) 4215 and Dhofar 700 diogenite meteorites and their mass-independent 26Mg isotope compositions (26Mg*) to better understand the timing of differentiation and crystallization of their source reservoir(s). NWA 4215 defines a Pb-Pb age of 4484.5 ± 7.9 Myr and has a 26Mg* excess of +2.3 ± 1.6 ppm whereas Dhofar 700 has a Pb-Pb age of 4546.4 ± 4.7 Myr and a 26Mg* excess of +25.5 ± 1.9 ppm. We interpret the young age of NWA 4215 as a thermal overprint, but the age of Dhofar 700 is interpreted to represent a primary crystallization age. Combining our new data with published Mg isotope and trace element data suggests that approximately half of the diogenites for which such data are available crystallized within the first 1–2 Myr of our solar system, consistent with a short-lived, early-formed magma ocean undergoing convective cooling. The other half of the diogenites, including both NWA 4215 and Dhofar 700, are best explained by their crystallization in slowly cooled isolated magma chambers lasting over at least ~20 Myr.

AB - The large collection of howardite-eucrite-diogenite (HED) meteorites allows us to study the initial magmatic differentiation of a planetesimal. We report Pb-Pb ages of the unequilibrated North West Africa (NWA) 4215 and Dhofar 700 diogenite meteorites and their mass-independent 26Mg isotope compositions (26Mg*) to better understand the timing of differentiation and crystallization of their source reservoir(s). NWA 4215 defines a Pb-Pb age of 4484.5 ± 7.9 Myr and has a 26Mg* excess of +2.3 ± 1.6 ppm whereas Dhofar 700 has a Pb-Pb age of 4546.4 ± 4.7 Myr and a 26Mg* excess of +25.5 ± 1.9 ppm. We interpret the young age of NWA 4215 as a thermal overprint, but the age of Dhofar 700 is interpreted to represent a primary crystallization age. Combining our new data with published Mg isotope and trace element data suggests that approximately half of the diogenites for which such data are available crystallized within the first 1–2 Myr of our solar system, consistent with a short-lived, early-formed magma ocean undergoing convective cooling. The other half of the diogenites, including both NWA 4215 and Dhofar 700, are best explained by their crystallization in slowly cooled isolated magma chambers lasting over at least ~20 Myr.

U2 - 10.1111/maps.12848

DO - 10.1111/maps.12848

M3 - Journal article

AN - SCOPUS:85016482735

VL - 52

SP - 1233

EP - 1243

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

SN - 1086-9379

IS - 6

ER -

ID: 240786006