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The Astrophysical Journal Letters (ApJL)

Resumen/Descripción – provisto por la editorial en inglés

The Astrophysical Journal Letters is an open access express scientific journal that allows astrophysicists to rapidly publish short notices of significant original research. ApJL articles are timely, high-impact, and broadly understandable.

Palabras clave – provistas por la editorial

astronomy; astrophysics

Disponibilidad

Institución detectada	Período	Navegá	Descargá	Solicitá
No detectada	desde ene. 2010 / hasta dic. 2023	IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

2041-8205

ISSN electrónico

2041-8213

Editor responsable

American Astronomical Society (AAS)

Idiomas de la publicación

inglés

País de edición

Reino Unido

Información sobre licencias CC

https://creativecommons.org/licenses/by/4.0/

Cobertura temática

Ciencias físicas

Tabla de contenidos

doi: 10.3847/2041-8213/ab2044

Timing and Origin of the Angrite Parent Body Inferred from Cr Isotopes

Ke Zhu; Frédéric Moynier; Daniel Wielandt; Kirsten K. Larsen; Jean-Alix Barrat; Martin Bizzarro

<jats:title>Abstract</jats:title> <jats:p>Angrite meteorites are some of the oldest materials in the solar system. They provide important information on the earliest evolution of the solar system and accretion timescales of protoplanets. Here, we show that the <jats:sup>54</jats:sup>Cr/<jats:sup>52</jats:sup>Cr ratio is homogeneously distributed among angrite meteorites within 13 parts per million, indicating that precursor materials must have experienced a global-scale melting such as a magma ocean. The <jats:sup>53</jats:sup>Cr/<jats:sup>52</jats:sup>Cr and Mn/Cr ratios are correlated, which is evidence for an initial <jats:sup>53</jats:sup>Mn/<jats:sup>55</jats:sup>Mn ratio of (3.16 ± 0.11) × 10<jats:sup>−6</jats:sup>. When anchored to the U-corrected Pb–Pb age for the D’Orbigny angrite, this initial <jats:sup>53</jats:sup>Mn/<jats:sup>55</jats:sup>Mn corresponds to an absolute age of 4563.2 ± 0.3 Ma, i.e., 4.1 ± 0.3 Ma after Ca–Al-rich inclusion-formation. This age is distinct from that of the volatile depletion events dated by the <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr initial ratio and therefore must correspond to the age of crystallization of the magma ocean and crust formation of the angrite parent body (APB), which can also constrain a slightly bigger size of APB than that of Vesta. Furthermore, this age is similar to those obtained from internal isochrons of the oldest volcanic angrites that cooled rapidly at the surface of the parent body (with ages of 4564 ∼ 4563 Ma), while older than those obtained from plutonic angrites (4561 ∼ 4556 Ma) that cooled down slowly, located deeper within the parent body. This implies that cooling of the APB took at least ∼8 Myr after its differentiation.</jats:p>