The composition of the mantle of the eucrite parent body and the origin of eucrites

Jones, J. H.

doi:10.1016/0016-7037(84)90092-9

Cited by 51 publications

(34 citation statements)

References 21 publications

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“…% Sc 2 O 3 -doped experiments to measure Sc D ol/liq and Sc D pig/liq . The results, as applicable to eucrites, basically corroborated those of Jones (1984b), who used literature partition coefficients for Sc. The implications of these experiments were that most main group eucrites were produced by ~20 % partial melting and that there was very little pyroxene left in the residuum.…”

Section: Sc Partitioningsupporting

confidence: 83%

“…I used these olivine/liquid relationships and other considerations to calculate the composition of the Eucrite Parent Body (Jones, 1984b). Eucrites are basaltic (tholiitic), achondritic meteorites that probably (mostly) originate from the asteroid 4-Vesta (e.g., Consolmagno and Drake, 1977).…”

Section: Olivine/liquid Partition Coefficients (Part I)mentioning

confidence: 99%

“…eucrites; Jones, 1984b;Paslick et al, 1990;Hoff et al, 2014). These were then followed up by Vern Lauer (JSC), who tested the limits of Sc solubility in olivine.…”

Section: Sc Partitioningmentioning

confidence: 99%

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Thoughts and Reminiscences on Experimental Trace Element Partitioning

Jones

2016

Geochem. Persp.

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Section: Sc Partitioningsupporting

confidence: 83%

Section: Olivine/liquid Partition Coefficients (Part I)mentioning

confidence: 99%

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Thoughts and Reminiscences on Experimental Trace Element Partitioning

Jones

2016

Geochem. Persp.

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“…Estimating the abundances of the moderately siderophile elements Ni, Co, Mo, W and P in a planetary mantle from which we have only basaltic samples is a challenge, but much is learned from comparison with terrestrial mantle and basalt samples (e.g., Delano, 1986 Wanke et al, 1972Wanke et al, , 1977Palme el al., 1978;Warren and Jerde, 1987;Mittlefehldt, 1979 (Jones, 1984;Dreihus and WBnke, 1980; Morgan e f al., 1978).…”

Section: Abundances Of Moderately Siderophile Elements In the Howardimentioning

confidence: 99%

A magma ocean on Vesta: Core formation and petrogenesis of eucrites and diogenites

Righter

Drake

1997

Meteorit & Planetary Scien

291

298

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Abstract-Available evidence strongly suggests that the HED (howardite, eucrite, diogenite) meteorites are samples of asteroid 4 Vesta. Abundances of the moderately siderophile elements (Ni, Co, Mo, W and P) in the HED mantle indicate that the parent body may have been completely molten during its early history. Duriig cooling of a chondritic composition magma ocean, equilibrium crystallization is fostered by the suspension of crystals in a convecting magma ocean until the crystal fraction reaches a critical value near 0.80, when the convective system freezes and melts segregate from crystals by gravitational forces. The extruded liquids are similar in composition to Main Group and Stannern trend eucrites, and the last pyroxenes to precipitate out of this ocean (before convective lockup) span the compositional range of the diogenites. Subsequent fractional crystallization of a Main Group eucrite liquid, which has been isolated as a body of magma, produces the Nuevo Laredo trend and the cumulate eucrites. The predicted cumulate mineral compositions are in close agreement with phase compositions analyzed in the cumulate eucrites. Thus, eucrites and diogenites are shown to have formed as part of a simple and continuous crystallization sequence starting with a magma ocean environment on an asteroidal size parent body that is consistent with Vesta.

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“…They discussed the genetic relationship among eucrites, cumulate eucrites and parental magma. The composition of the mantle of the HED meteorites was estimated by Jones (1984).…”

Section: Introductionmentioning

confidence: 99%

Mineralogical records of early planetary processes on the howardite, eucrite, diogenite parent body with reference to Vesta

Takeda

1997

Meteorit & Planetary Scien

101

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Abstract-Mineralogical information recovered from the howardite, eucrite, diogenite (HED) meteorites was employed to reconstruct the history of the parent body and relate it to 4 Vesta. These interpreted crustal evolution processes were then compared to the expected geological features on the surface of a likely protoplanet, 4 Vesta. The original crustal materials of the HED parent body were preserved as mineral grains and lithic clasts, but in many eucrites, FeMg ratios in pyroxenes were homogenized by diffusion after crystallization. The crystallization trend of the protocrust has been deciphered by (I) examining monomict and crystalline samples and using their mineralogical and chemical information to formulate a sequence of crystallization and cooling trends; and by (2) reconstructing the original crust prior to cratering events from lithic clasts and mineral fragments in polymict breccias such as howardites and polymict eucrites. Mineral components are identical, both in the individual HED and in polymict breccias, and no remnants of primitive materials were preserved in the polymict breccias. A layered crust model reconstructed from such breccias consists of an upper crust with extrusive lava-like eucrites that have been brecciated and metamorphosed, diogenite mantle, and cumulate eucrites of varying thickness between them. This model can be used to explain the surface geological features of Vesta observed from the Hubble space telescope. A large crater with diogenitic orthopyroxene at the crater floor is consistent with the deepest diogenitic layer of the layered crust model; and an underlying olivine layer is expected from early crystallized olivine in the crystal fractionation model. The old terrain of eucritic surface materials of Vesta can be howardites, polymict eucrites, or regolith-like eucrites produced from eucrites extruded and impacted on the surface. Partial melting models of eucrites seem to be favored by the rare-earth element (FEE) chemistry and experimental studies. Unfortunately, partial melting models have not demonstrated how the HED parent body is converted to a layered crust without producing any metamorphosed primitive material in the layered crust. The origin of cumulate eucrites with systematic variation of textures and chemistries of pyroxene can be explained by the layered crust model with excavation and mixing of trapped liquid. Discovery of basaltic materials with Na-rich plagioclase and augite in iron meteorites, which are the products of partial melting, suggests that eucrites may be unique to a body that underwent large-scale differentiation and metamorphism.

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The composition of the mantle of the eucrite parent body and the origin of eucrites

Cited by 51 publications

References 21 publications

Thoughts and Reminiscences on Experimental Trace Element Partitioning

Thoughts and Reminiscences on Experimental Trace Element Partitioning

A magma ocean on Vesta: Core formation and petrogenesis of eucrites and diogenites

Mineralogical records of early planetary processes on the howardite, eucrite, diogenite parent body with reference to Vesta

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