Early formation of evolved asteroidal crust

  title={Early formation of evolved asteroidal crust},
  author={James M. D. Day and Richard D. Ash and Yang Liu and Jeremy J Bellucci and Douglas Iii Rumble and W. F. McDonough and Richard J. Walker and Lawrence A. Taylor},
Mechanisms for the formation of crust on planetary bodies remain poorly understood. It is generally accepted that Earth’s andesitic continental crust is the product of plate tectonics, whereas the Moon acquired its feldspar-rich crust by way of plagioclase flotation in a magma ocean. Basaltic meteorites provide evidence that, like the terrestrial planets, some asteroids generated crust and underwent large-scale differentiation processes. Until now, however, no evolved felsic asteroidal crust… Expand
Non-basaltic asteroidal magmatism during the earliest stages of solar system evolution: A view from Antarctic achondrites Graves Nunatak 06128 and 06129
The recently recovered paired Antarctic achondrites Graves Nunatak 06128 and 06129 (GRA) are meteorites that represent unique high-temperature asteroidal processes that are identified in only a fewExpand
Trachyandesitic volcanism in the early Solar System
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Alkali magmatism on a carbonaceous chondrite planetesimal
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A 4,565-My-old andesite from an extinct chondritic protoplanet
EC 002 is, to date, the oldest known piece of an igneous crust with a 26Al-26Mg crystallization age of 4,565.0 million years (My), indicating that almost all of these bodies have disappeared, either because they went on to form the building blocks of larger bodies or planets or were simply destroyed. Expand
Silica-rich volcanism in the early solar system dated at 4.565 Ga
Data on recently discovered volcanic meteorite Northwest Africa (NWA) 11119 is reported, which represents the first, and oldest, silica-rich (andesitic to dacitic) porphyritic extrusive crustal rock with an Al–Mg age of 4564.8 ± 0.3 Ma indicating that this is the earliest evidence of silicic volcanism in the Solar System to date. Expand
Extra-terrestrial igneous granites and related rocks: A review of their occurrence and petrogenesis
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Evidence for anorthositic crust formed on an inner solar system planetesimal
doi: 10.7185/geochemlet.1921 During the first million years of solar system history, planetesimals experienced extensive melting powered by the radioactive decay of 26Al (Lee et al., 1977). To date,Expand
More Evidence for Multiple Meteorite Magmas
Cosmochemists have identified six main compositional types of magma that formed inside asteroids during the first 100 million years of Solar System history. These magmas vary in their chemical andExpand
H and Cl isotope characteristics of indigenous and late hydrothermal fluids on the differentiated asteroidal parent body of Grave Nunataks 06128
Abstract The paired achondrites Graves Nunataks (GRA) 06128 and 06129 are samples of an asteroid that underwent partial melting within a few million years after the start of Solar System formation.Expand
Linking asteroids and meteorites to the primordial planetesimal population
Abstract Meteorites provide a unique insight into early Solar System processes. However, to fully interpret this record requires that these meteorites are related back to their source asteroids andExpand


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It is shown that magma oceans were present on all the differentiated Solar System bodies so far sampled, and the modification of such bodies before incorporation into larger objects can explain some anomalous planetary features, such as Earth's high Mg/Si ratio. Expand
Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago
The discovery of a detrital zircon with an age as old as 4,404 ± 8 Myr is reported, about 130 million years older than any previously identified on Earth and represents the earliest evidence for continental crust and oceans on the Earth. Expand
A 4-Gyr shock age for a martian meteorite and implications for the cratering history of Mars
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Constraints on the role of impact heating and melting in asteroids
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The age of ferroan anorthosite 60025: oldest crust on a young Moon?
Abstract Sm Nd isotopic data for mineral separates from the ferroan anorthosite 60025 define a precise isochron of 4.44 ± 0.02Ga age. This age is roughly 110 m.y. younger than the formation of theExpand
Comparative petrology, geochemistry, and petrogenesis of evolved, low-Ti lunar mare basalt meteorites from the LaPaz Icefield, Antarctica
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Core formation in asteroids
Chemical arguments based on the S concentrations in the metallic magmas that formed magmatic iron meteorites and on the lack of pyroxene in pallasites suggest that core formation in asteroids wasExpand
Petrologic history of the moon inferred from petrography, mineralogy, and petrogenesis of Apollo 11 rocks
The mineralogy and petrology of the Apollo 11 rocks are consistent with impact melting of ilmenite and pyroxene crystals plus liquid derived from fractional crystallization of basaltic magama. TheExpand
Clast sizes of ejecta from explosive eruptions on asteroids: implications for the fate of the basaltic products of differentiation
We use a simple model of the formation, growth, coalescence and migration of veins of basaltic melt generated by partial melting in chondritic asteroids to deduce the sizes of, and pressures within,Expand