Post miocene volcanoes on Bougainville Island, territory of Papua and New Guinea
- 73 Downloads
Seventeen post-Miocene strato volcanoes have been identified on Bougainville, the largest island of the Solomon Group. From north-west to south-east, these are the Tore, Balbi, Numa Numa, Billy Mitchell, Bagana, Reini, and Bakanovi volcanoes and the Takuan and Toroka groups of volcanoes: the Taroka group includes Loloru volcano. In addition there are several other post-Miocene volcanoes in northern Bougainville which have not been accurately delineated. Only three of the volcanoes are active or potentially active; these are Bagana, the most active volcano in the Territory of New Guinea, and the dormant Balbi and Loloru volcanoes.
The volcanoes are built up of lavas and pyroclastic deposits mostly of andesitic composition, although some dacitic rocks are also present. Modal and chemical analyses show that these rocks belong to the calc-alkaline suite characteristic of orogesic regions.
KeywordsLava Flow Active Volcano Pyroclastic Deposit Lava Dome Plagioclase Phenocryst
Unable to display preview. Download preview PDF.
- Baker, G., 1949,Note on volcanic rocks, with special reference to plagioclase feldspars, from Mount Bogana, Bougainville Island, Solomon Islands. Trans Amer. geophys. Union, 30, p. 250–262.Google Scholar
- Blake, D. H., andMiezitis, Y., 1967,The geology of Bougainville and Buka Islands, New Guinea, Bur. Min. Resour. Aust., Bull. 93, 56 pp.Google Scholar
- Branch, C. D., 1967,Short papers on vulcanology from the Rabaul Observatory. Bur. Min. Resour. Aust. Rep. 107, 42 pp.Google Scholar
- Coleman, P. J., 1965,Stratigraphical and structural notes on the British Solomon Islands — with reference to the first geological map, 1962. Brit. Solomon Is. geological Record, Vol. 2, 1959–62, Rep. 28, p. 17–31.Google Scholar
- Cotton, C. A., 1944,Volcanoes as Landscape Forms. Whitcombe and Tombs, New Zealand, 416 pp.Google Scholar
- Fisher, N. H., 1939,Report on the volcanoes of the Territory of New Guinea. Terr. N. Guin. geol. Bull. 2, 23 pp.Google Scholar
- -----, 1957,Catalogue of the active volcanoes of the world. Part. V. Catalogue of the active volcanoes and solfatara fields of Melanesia. Int. volc. Assoc., 1957.Google Scholar
- Gregg, D. R., 1960,The geology of Tongariro Subdivision. N. Z. geol. Surv., Bull. 40.Google Scholar
- Guppy, H. B., 1887,The Solomon Islands. Swann, Sonnerscheim, and Lovery, London.Google Scholar
- Morgan, W. R., 1966,A note on the petrology of some lava types from east New Guinea. Jour. geol. Soc. Australia, 13, p. 583–591.Google Scholar
- Taylor, G. A., 1956,Review of volcanic activity in the Territory of Papua-New Guinea, the Solomon and New Hebrides Islands, 1951–53. Bull. Volc., ser. 2, 18, p. 25–37.Google Scholar
- Thayer, T. P., 1937,Petrology of later Tertiary and Quaternary rocks of the north-central Cascade Mountains in Oregon. Bull. geol. Soc. Amer., 48, p. 1611–1652.Google Scholar
- Turner, F. J., andVerhoogen, J., 1960,Igneous and Metamorphic Petrology. Mac Graw-Hill, New York, 694 pp.Google Scholar
- Williams, H., 1942,The geology of Crater Lake National Park, Oregon. Carnegie Inst. Washington Publ. 540, pp.Google Scholar