Formation of Anorthosite-Gabbro Rhythmic Phase Layering: An Example at North Arm Mountain, Bay of Islands Ophiolite
Rhythmically layered anorthosite and gabbro are exposed in a 4–10-m thick interval at the base of the layered gabbro unit on North Arm Mountain, one of four massifs that compose the Bay of Islands ophiolite, Newfoundland. Within the rhythmically layered interval, up to 37 anorthosite layers 1–2 cm t...
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| Veröffentlicht in: | Journal of petrology 1990-02, Vol.31 (1), p.1-50 |
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| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Rhythmically layered anorthosite and gabbro are exposed in a 4–10-m thick interval at the base of the layered gabbro unit on North Arm Mountain, one of four massifs that compose the Bay of Islands ophiolite, Newfoundland. Within the rhythmically layered interval, up to 37 anorthosite layers 1–2 cm thick alternate with gabbroic layers 7–10 cm thick. Anorthosites are adcumulates (most contain |
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| ISSN: | 0022-3530 1460-2415 |
| DOI: | 10.1093/petrology/31.1.1 |