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Talasea Peninsula, West New Britain Province, Papua New Guinea
The Talasea peninsula, located on the north coast of New Britain island, is composed of a chain of Quaternary composite volcanoes and a caldera, with rock types ranging from basalt to rhyolite.The andesites of Talasea are typically porphyritic, with phenocrysts of plagioclase, clinopyroxene, orthopyroxene and titanomagnetite, in a groundmass of the same minerals and glass. The acid rocks have a similar mineralogy but also contain quartz, amphibole, biotite and ilmenite, while the basalts lack orthopyroxene and titanomagnetite phcnocrysts, but contain olivine.
Mineral List
| Albite Anorthite Augite Biotite 'Chlorite Group' | Cristobalite Diopside Enstatite 'Glass' 'Hornblende' | Iddingsite Ilmenite Magnetite var: Titaniferous Magnetite 'Olivine' Pigeonite | Quartz Tridymite |
17 entries listed. 10 valid minerals.
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References
- Lowder, G.G. (1970): The Volcanoes and Caldera of Talasea, New Britain: Mineralogy. Contributions to Mineralogy and Petrology 26, 324-340.
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Locality Updated: Arandis Tin Mine, Arandis, Swakopmund District, Erongo Region, NamibiaFrom Debbie Woolf, 23rd May 2013 22:19:58