Quaternary volcanism on Manus and M'buke Islands.
Date
Authors
Jaques, A. L.
Journal Title
Journal ISSN
Volume Title
Publisher
Geological Survey of Papua New Guinea
Access Statement
Abstract
Quaternary basalt is widely distributed around a caldera that forms Southwest Bay in SW Manus Island. The basalts are of transitional to mildly alkaline composition, rich in TiO2, Zr, Nb, and light rare-earth elements, and resemble the incompatible-element-enriched tholeiites of oceanic islands such as Hawaii and Iceland. A change from island-arc (plate-boundary) igneous activity in the Tertiary to ocean-island-type (intraplate) volcanism in the Quaternary, reflects a striking change in tectonic setting thought to have resulted from left-lateral translation of Manus Island and New Ireland past New Britain. The Quaternary intraplate volcanism of Southwest Bay, M'Buke and Johnstone Islands, and the St Andrew Strait Islands may be controlled by a NW-trending fracture system, but alternatively may represent a 'hot spot' trace.-Author
Description
Keywords
Citation
Collections
Source
Type
Book Title
Cooke-Ravian Volume of Volcanological Papers, Geological Survey of Papua New Guinea Memoirs
Entity type
Publication