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Details van artikel 7 van 12 gevonden artikelen
| Titel: |
Geochemistry, mineralogy and tectonic setting of deerite-bearing meta-ironstones from the Emo Metamorphics of Papua New Guinea |
| Auteur: |
Worthing, M. A. Bennett, M. A. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 35 (1988) nr. 1 pagina's 29-38 |
| Jaar: |
1988-03 |
| Inhoud: |
The geochemistry of two deerite-bearing meta-ironstones from the Emo Metamorphics of Papua New Guinea suggests that they were deposited as metalliferous cherts enriched in manganese and iron by hydrothermal exhalative activity in an ocean ridge system. Subsequent blueschist facies metamorphism resulted in the formation of the assemblage deerite-quartz-albite-iron oxides-alkali amphiboles-spessar-tine-stilpnomelane-apatite, with calcium-manganese carbonates in one specimen. Assemblages in associated metabasites suggest P-T conditions of 7 kb at 320°C, which overlap with the P-T field defined by one of the meta-ironstones. Oxygen fugacity was probably an important control in determining variations in mineralogy and mineral chemistry. Preliminary data on the trace element geochemistry of associated metabasites are consistent with an ocean ridge environment for the formation of the meta-ironstones. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 12 gevonden artikelen
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