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

By Loren W. Kroenke, James V. Eade

ISBN-10: 3540573720

ISBN-13: 9783540573722

ISBN-10: 364285043X

ISBN-13: 9783642850431

The Earth technological know-how sequence of the Circum-Pacific investment for send time used to be made to be had via Council for power and Mineral assets (CPCEMR) the U. S. organisation for foreign improvement, the is designed to exhibit the result of geologie learn in USGS, the U. S. place of work of Naval learn (for HIG's and round the Pacific Basin. Topies of curiosity contain 1982 work), the Australian improvement tips framework geology, petroleum geology, demanding minerals, Bureau, the Australian Bureau of Mineral assets geothermal power, environmental geology, volcanology, (BMR), the hot Zealand Ministry of international Affairs, oceanography, tectonics, geophysies, geochemistry, and the recent Zealand Departrnent of medical and commercial functions of renewable power. The CPCEMR sup­ learn (DSIR), the hot Zealand Geological Survey, ports and publishes result of medical study that may and the hot Zealand Oceanographic Institute (NZOI). enhance the data of strength and mineral source Coordination of this system used to be supplied via the U. S. strength within the circum-Pacific quarter. The Earth Sci­ Departrnent of kingdom and the South Pacific utilized Geo­ ence sequence is particularly designed to submit papers that technological know-how fee (SOPAC, previously the United comprise new facts and new maps, document on CPCEMR­ Nations-sponsored Committee for the Coordination of backed symposia and workshops, and describe the Joint Prospecting for Mineral assets in South Pacific result of onshore and marine geological and geophysieal Offshore parts CCOP/SOP AC) in Fiji. Over one hundred fifty scien­ explorations.

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Additional info for Basin Formation, Ridge Crest Processes, and Metallogenesis in the North Fiji Basin

Example text

825. , M. Barazangi, and B. Isacks, 1972, P and S travel times in the Tonga-Fiji region: A zone of low velocity in the uppermost mantle behind the Tonga island arc: Journal of Geophysical Research, v. 77, p. 6427-6434. L. Isacks, 1971, Lateral variations of seismie wave attenuation in the upper mantle above the indined zone of the Tonga island are: Deep anomaly in the upper mantle: Journal of Geophysieal Research, v. 76, p. 8493-8516. , B. Isacks, J. Dubois, and J. Pascal, 1974, Seismic wave attenuation in the upper mantle beneath the Southwest Pacific: Tectonophysics, v.

14 and 23) confirm, for the first time, extensional deformation in the North Fiji Basin. The earthquakes are situated within the north-trending belt of seismicity between 172° and 174°E, and directly south of the ridge tripIe junction proposed by Kroenke et al. (this volume). The stress directions inferred for these two events are virtually identical (see inset in Figure 4), but are strikingly dissimilar from the remainder of the basin. The tension axes are rotated by approximately 55° from the neighboring earthquakes along the Hazel Holme Ridge, and by 60-65° from those observed in the central N orth Fiji Basin and along the Fiji Fracture Zone.

T 600 00:9~ .. 700 0 200 0 400 0 o ~B 00 °o~ 0 0 0 0 00 600 BOO 1000 1200 DISTANCe: (K M) Figure 3. Seismic cross sections; locations are shown in figure upper right. 1400 0 00 oCb 00 4b

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

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