EXTENSIVE IMPACT MELTING ON THE H-CHONDRITE PARENT ASTEROID DURING THE CATACLYSMIC BOMBARDMENT OF THE EARLY SOLAR SYSTEM: EVIDENCE FROM THE ACHONDRITIC METEORITE DAR AL GANI 896
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dc.contributor.author | Folco L. | |
dc.contributor.author | Bland P.A. | |
dc.contributor.author | D’Orazio M. | |
dc.contributor.author | Franchi I.A. | |
dc.contributor.author | Kelley S.P. | |
dc.contributor.author | Rocchi S. | |
dc.date.accessioned | 2022-03-21T07:44:18Z | |
dc.date.available | 2022-03-21T07:44:18Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=12090577 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2004, 68, 10, 2379-2397 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36527 | |
dc.description.abstract | DaG 896 is an olivine-rich microporphyritic rock of komatiitic composition. Both the olivine composition (Fa17.5±2.1, [Mn/Mg] = 0.0061) and the bulk oxygen isotopic composition (δ O = +2.55, δ O = +3.50) indicate that DaG 896 is a sample of the H-chondrite parent body. The bulk chemistry shows an H-chondritic distribution of lithophile elements, whereas chalcophile and siderophile elements are strongly depleted, indicating formation through whole-rock melting (or nearly so) of H-chondrite material, nearly complete loss of the metal plus sulfide component, and crystallization without significant igneous fractionation. Superheated, severely shocked chondritic relics (∼10 vol%), typically in the form of corroded lithic fragments <100 μm in size intimately distributed within the igneous lithology, indicate that melting was triggered by a highly energetic impact, which possibly induced shock pressures of ∼80–100 GPa. The relatively young 3.704 ± 0.035 Ga Ar- Ar crystallization age is consistent with the impact melting origin, as magmatism in the asteroid belt was active only in the first hundred million years of solar system history. | |
dc.title | EXTENSIVE IMPACT MELTING ON THE H-CHONDRITE PARENT ASTEROID DURING THE CATACLYSMIC BOMBARDMENT OF THE EARLY SOLAR SYSTEM: EVIDENCE FROM THE ACHONDRITIC METEORITE DAR AL GANI 896 | |
dc.type | Статья |
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