A partial melting study of an ordinary (H) chondrite composition with application to the unique achondrite Graves Nunataks 06128 and 06129

Melting experiments of a synthesized, alkali‐bearing, H‐chondrite composition were conducted at ambient pressure with three distinct oxygen fugacity conditions ( IW ‐1, IW , and IW +2). Oxygen fugacity conditions significantly influence the compositions of partial melts. Partial melts at IW ‐1 are d...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Usui, Tomohiro [verfasserIn] Jones, John H Mittlefehldt, David W

Format:	Artikel
Sprache:	Englisch

Erschienen:	2015

Rechteinformationen:	Nutzungsrecht: © The Meteoritical Society, 2015.

Schlagwörter:	Melting

Übergeordnetes Werk:	Enthalten in: Meteoritics & planetary science - Lawrence, Kan. : Allen Press, 1996, 50(2015), 4, Seite 759-781
Übergeordnetes Werk:	volume:50 ; year:2015 ; number:4 ; pages:759-781

Links:	Volltext Link aufrufen Link aufrufen

DOI / URN:	10.1111/maps.12392

Katalog-ID:	OLC1965316948

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520			\|a Melting experiments of a synthesized, alkali‐bearing, H‐chondrite composition were conducted at ambient pressure with three distinct oxygen fugacity conditions ( IW ‐1, IW , and IW +2). Oxygen fugacity conditions significantly influence the compositions of partial melts. Partial melts at IW ‐1 are distinctly enriched in SiO 2 relative to those of IW and IW +2 melts. The silica‐enriched, reduced ( IW ‐1) melts are characterized by high alkali contents and have silica‐oversaturated compositions. In contrast, the silica‐depleted, oxidized (≥IW) melts, which are also enriched in alkali contents, have distinctly silica‐undersaturated compositions. These experimental results suggest that alkali‐rich, felsic, asteroidal crusts as represented by paired achondrites Graves Nunataks 06128 and 06129 should originate from a low‐degree, relatively reduced partial melt from a parent body having near‐chondritic compositions. Based on recent chronological constraints and numerical considerations as well as our experimental results, we propose that such felsic magmatism should have occurred in a parent body that is smaller in size and commenced accreting later than those highly differentiated asteroids having basaltic crusts and metallic cores.
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author_browse	Usui, Tomohiro
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author-letter	Usui, Tomohiro
doi_str_mv	10.1111/maps.12392
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title_sort	partial melting study of an ordinary (h) chondrite composition with application to the unique achondrite graves nunataks 06128 and 06129
title_auth	A partial melting study of an ordinary (H) chondrite composition with application to the unique achondrite Graves Nunataks 06128 and 06129
abstract	Melting experiments of a synthesized, alkali‐bearing, H‐chondrite composition were conducted at ambient pressure with three distinct oxygen fugacity conditions ( IW ‐1, IW , and IW +2). Oxygen fugacity conditions significantly influence the compositions of partial melts. Partial melts at IW ‐1 are distinctly enriched in SiO 2 relative to those of IW and IW +2 melts. The silica‐enriched, reduced ( IW ‐1) melts are characterized by high alkali contents and have silica‐oversaturated compositions. In contrast, the silica‐depleted, oxidized (≥IW) melts, which are also enriched in alkali contents, have distinctly silica‐undersaturated compositions. These experimental results suggest that alkali‐rich, felsic, asteroidal crusts as represented by paired achondrites Graves Nunataks 06128 and 06129 should originate from a low‐degree, relatively reduced partial melt from a parent body having near‐chondritic compositions. Based on recent chronological constraints and numerical considerations as well as our experimental results, we propose that such felsic magmatism should have occurred in a parent body that is smaller in size and commenced accreting later than those highly differentiated asteroids having basaltic crusts and metallic cores.
abstractGer	Melting experiments of a synthesized, alkali‐bearing, H‐chondrite composition were conducted at ambient pressure with three distinct oxygen fugacity conditions ( IW ‐1, IW , and IW +2). Oxygen fugacity conditions significantly influence the compositions of partial melts. Partial melts at IW ‐1 are distinctly enriched in SiO 2 relative to those of IW and IW +2 melts. The silica‐enriched, reduced ( IW ‐1) melts are characterized by high alkali contents and have silica‐oversaturated compositions. In contrast, the silica‐depleted, oxidized (≥IW) melts, which are also enriched in alkali contents, have distinctly silica‐undersaturated compositions. These experimental results suggest that alkali‐rich, felsic, asteroidal crusts as represented by paired achondrites Graves Nunataks 06128 and 06129 should originate from a low‐degree, relatively reduced partial melt from a parent body having near‐chondritic compositions. Based on recent chronological constraints and numerical considerations as well as our experimental results, we propose that such felsic magmatism should have occurred in a parent body that is smaller in size and commenced accreting later than those highly differentiated asteroids having basaltic crusts and metallic cores.
abstract_unstemmed	Melting experiments of a synthesized, alkali‐bearing, H‐chondrite composition were conducted at ambient pressure with three distinct oxygen fugacity conditions ( IW ‐1, IW , and IW +2). Oxygen fugacity conditions significantly influence the compositions of partial melts. Partial melts at IW ‐1 are distinctly enriched in SiO 2 relative to those of IW and IW +2 melts. The silica‐enriched, reduced ( IW ‐1) melts are characterized by high alkali contents and have silica‐oversaturated compositions. In contrast, the silica‐depleted, oxidized (≥IW) melts, which are also enriched in alkali contents, have distinctly silica‐undersaturated compositions. These experimental results suggest that alkali‐rich, felsic, asteroidal crusts as represented by paired achondrites Graves Nunataks 06128 and 06129 should originate from a low‐degree, relatively reduced partial melt from a parent body having near‐chondritic compositions. Based on recent chronological constraints and numerical considerations as well as our experimental results, we propose that such felsic magmatism should have occurred in a parent body that is smaller in size and commenced accreting later than those highly differentiated asteroids having basaltic crusts and metallic cores.
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container_issue	4
title_short	A partial melting study of an ordinary (H) chondrite composition with application to the unique achondrite Graves Nunataks 06128 and 06129
url	http://dx.doi.org/10.1111/maps.12392 http://onlinelibrary.wiley.com/doi/10.1111/maps.12392/abstract http://search.proquest.com/docview/1669472309
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author2	Jones, John H Mittlefehldt, David W
author2Str	Jones, John H Mittlefehldt, David W
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doi_str	10.1111/maps.12392
up_date	2024-07-03T17:18:29.899Z
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A partial melting study of an ordinary (H) chondrite composition with application to the unique achondrite Graves Nunataks 06128 and 06129

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