Basin Formation, Ridge Crest Processes, and Metallogenesis by Loren W. Kroenke, James V. Eade

By Loren W. Kroenke, James V. Eade

The Earth technological know-how sequence of the Circum-Pacific investment for send time was once made to be had via Council for power and Mineral assets (CPCEMR) the U. S. employer for overseas improvement, the is designed to express the result of geologie learn in USGS, the U. S. workplace of Naval learn (for HIG's and round the Pacific Basin. Topies of curiosity contain 1982 work), the Australian improvement advice framework geology, petroleum geology, not easy minerals, Bureau, the Australian Bureau of Mineral assets geothermal power, environmental geology, volcanology, (BMR), the recent Zealand Ministry of international Affairs, oceanography, tectonics, geophysies, geochemistry, and the recent Zealand Departrnent of medical and business functions of renewable power. The CPCEMR sup­ study (DSIR), the hot Zealand Geological Survey, ports and publishes result of clinical examine that might and the hot Zealand Oceanographic Institute (NZOI). strengthen the data of power and mineral source Coordination of this system was once supplied through the U. S. strength within the circum-Pacific sector. The Earth Sci­ Departrnent of nation and the South Pacific utilized Geo­ ence sequence is particularly designed to put up papers that technological know-how fee (SOPAC, previously the United comprise new info and new maps, record on CPCEMR­ Nations-sponsored Committee for the Coordination of subsidized symposia and workshops, and describe the Joint Prospecting for Mineral assets in South Pacific result of onshore and marine geological and geophysieal Offshore components CCOP/SOP AC) in Fiji. Over a hundred and fifty scien­ explorations.

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Extra resources for Basin Formation, Ridge Crest Processes, and Metallogenesis in the North Fiji Basin (Circum-Pacific Council for Energy and Mineral Resources. Earth Science Series)

Example text

Holocene vo\canoes are indicated byopen triangles. Data are taken from the Circum·Pacific Council for Energy and Mineral Resources (1981) map. North Fiji Basin is a broad, trapezoid-shaped basin, bounded on two sides by inactive trenches and on two si des by island-arc platforms. Furthermore, the North Fiji Basin exhibits profuse internal complexity that reflects the complex tectonic histories of the arcs bounding the basin. Lastly, the North Fiji Basin is unique among the world's active back-arc basins in the position of its active spreading centers: in contrast to most basins, where the spreading centers are located within 150 km ofthe active volcanic arcs (Taylor and Karner, 1983), the North Fiji Basin's spreading centers appear to be distributed up to 800 km from the nearest convergent plate boundary at the New Hebrides Trench.

86, p. 2825-2852. , 1984, Seismotectonics of the Fiji Plateau and Lau Basin: Tectonophysics, v. 102, p. 17-32. , 1983, Reports of eathquakes feit in Fiji, 18501940: Mineral Resources Department of Fiji, Report 48, 54 p. , 1985, Focal mechanisms of earthquakes near Fiji: Mineral Resources Department of Fiji, Note. A, 1978, Analysis of palaeomagnetic da ta from the New Hebrides: Bulletin of the Australian Society for Exploration Geophysicists, v. 9, p. 117-123. J. J. , The Western Pacific: Island Ares, Marginal Seas, Geochemistry: University of Western Australia Press, Nedlands, p.

X-marks on the nodal planes indicate the poles to the opposite plane. The P (pressure) and T (tension) axes are located at the base of the letters P and T. ~x T w ·l~ • • iI'! • • •• )(71' 0 00 I 29 0 0 0 0 *• s tensional stresses within the basin. However, our observations corroborate Eguchi's (1984) finding that the fault planes of these events are oriented obliquely to the proposed strike ofboth ofthe north-trending spreading centers proposed in this portion of the basin (Chase, 1971; Malahoff et al.

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