Partial melting of the Indarch (EH4) meteorite: A textural, chemical, and phase relations view of melting and melt migration
書誌事項
- 公開日
- 1999-09
- 権利情報
-
- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
-
- 10.1111/j.1945-5100.1999.tb01386.x
- 公開者
- Wiley
この論文をさがす
説明
<jats:p><jats:bold>Abstract—</jats:bold>To test whether aubrites can be formed by melting of enstatite chondrites and to understand igneous processes at very low O fugacities, we have conducted partial melting experiments on the Indarch (EH4) chondrite at 1000–1500 °C. Silicate melting begins at 1000 °C, and Indarch is completely melted by 1500 °C. The metal‐sulfide component melts completely at 1000 °C. Substantial melt migration occurs at 1300–1400 °C, and metal migrates out of the silicate charge at 1450 °C and ∼50% silicate partial melting. As a group, our experiments contain three immiscible metallic melts (Si‐, P‐, and C‐rich), two immiscible sulfide melts (Fe‐ and FeMgMnCa‐rich), and silicate melt. Our partial melting experiments on the Indarch (EH4) enstatite chondrite suggest that igneous processes at low<jats:italic>f</jats:italic>O<jats:sub>2</jats:sub>exhibit several unique features. The complete melting of sulfides at 1000 °C suggests that aubritic sulfides are not relics. Aubritic oldhamite may have crystallized from Ca and S complexed in the silicate melt. Significant metal‐sulfide melt migration might occur at relatively low degrees of silicate partial melting. Substantial elemental exchange occurred between different melts (<jats:italic>e.g.</jats:italic>, S between sulfide and silicate, Si between silicate and metal), a feature not observed during experiments at higher<jats:italic>f</jats:italic>O<jats:sub>2</jats:sub>. This exchange may help explain the formation of aubrites from known enstatite chondrites.</jats:p>
収録刊行物
-
- Meteoritics & Planetary Science
-
Meteoritics & Planetary Science 34 (5), 735-746, 1999-09
Wiley