The Portales Valley meteorite breccia: evidence for impact-induced melting and metamorphism of an ordinary chondrite
The Portales Valley H-chondrite fall is an annealed impact-melt breccia with coarse metal interstitial to angular and subrounded silicate clasts. The large metal-rich regions exhibit a Widmanstätten structure and contain very little troilite. We were able to examine a 16.5 kg metal-rich specimen of...
Gespeichert in:
| Veröffentlicht in: | Geochimica et cosmochimica acta 2001, Vol.65 (2), p.323-342 |
|---|---|
| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Zusammenfassung: | The Portales Valley H-chondrite fall is an annealed impact-melt breccia with coarse metal interstitial to angular and subrounded silicate clasts. The large metal-rich regions exhibit a Widmanstätten structure and contain very little troilite. We were able to examine a 16.5 kg metal-rich specimen of Portales Valley. Silicates contain numerous flecks of metallic Cu and curvilinear trails of tiny metallic Fe–Ni blebs, characteristic of shocked and annealed chondrites. One silicate clast appears to have experienced little ( |
|---|---|
| ISSN: | 0016-7037 1872-9533 |
| DOI: | 10.1016/S0016-7037(00)00516-0 |