|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 5 van 10 gevonden artikelen
| Titel: |
Petrology and tectonic setting of blueschist facies metabasites from the Emo Metamorphics of Papua New Guinea |
| Auteur: |
Worthing, M. A. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 35 (1988) nr. 2 pagina's 159-168 |
| Jaar: |
1988-06 |
| Inhoud: |
Blueschist facies metabasites from the Emo Metamorphics of Papua New Guinea contain the assemblage quartz-albite-phengite-stilpnomelane-ferroglaucophane-chlorite-almandine-epidote-sphene-apatite + relict igneous pyroxene with omphacitic rims. The assemblage is similar to the lawsonite-epidote transition zone on New Caledonia. Textural variation from unfoliated to foliated blueschist is marked by an increase in retrograde modal actinolite and chlorite, suggesting that strain has accelerated the actinolite- and chlorite-forming reaction. Application of standard geobarometers and geothermometers to the primary assemblage suggests pressure and temperature conditions of metamorphism of approximately 7.0 kbar and 320°C. The textural variation suggests that the Emo Metamorphics may be a sliver of oceanic crust caught up in the thrusting that accompanied obduction of the Papuan ophiolite. The resulting depressurization led to retrograde growth of actinolite and chlorite. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 10 gevonden artikelen
| << vorige | volgende >> |