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 on hand via Council for power and Mineral assets (CPCEMR) the U. S. organization for foreign improvement, the is designed to express the result of geologie examine in USGS, the U. S. workplace of Naval learn (for HIG's and round the Pacific Basin. Topies of curiosity comprise 1982 work), the Australian improvement assistance framework geology, petroleum geology, tough 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 hot Zealand Departrnent of clinical and business purposes of renewable strength. The CPCEMR sup­ study (DSIR), the recent Zealand Geological Survey, ports and publishes result of medical examine that may and the recent Zealand Oceanographic Institute (NZOI). increase the data of power and mineral source Coordination of this system used to be supplied by means of the U. S. power within the circum-Pacific zone. 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 information and new maps, document 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 parts CCOP/SOP AC) in Fiji. Over one hundred fifty scien­ explorations.

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

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Modified by maeroseismie observations (Everingham, 1983). Between 1950 and 1960 (Group 11 in Figure 3) the loeation aeeuraey steadily improved due to inereased timing aeeuraey at the global seismie stations, the addition of key regional seismie stations, and the introduetion of computer loeation methods. From 1961 to the present (Group III in Figure 3), the global seismic network has provided a reiatively uniform, reliable basis for analyzing earthquake distribution. 5 • • • o 0 o 0 o o • • o \ 20 • \ o 25 \ 165 Figurc 3.

Below, we consider each of the groups of focal mechanism solutions individually. Soutlzem Nortlz Fiji Basin Two events at the southernmost edge of the basin (nos. 2 and 10) can be interpreted as hinge faulting of the Indo-Australian Plate. These events share a nearly vertical east -northeast trending fault plane, along which the north wall is downdropped. , 1969), is kinematically required if the northern portion of this plate is to be subducted at the New Hebrides Trench and the southern portion is to remain at the earth's surface.

1982a) and others. These two events are dose to the north-trending limb of the ridge HAMBURGER AND ISACKS 28 , o FIJI FRACTURE ZONE (#5,8,13,15-18) HAZEL HOLME RIDGE (#7,12,19- 22) o 9 o o o o 00 o o 00 o o , 0 s o Q, WESTERN ~ ~NORTH FIJI 8ASIN . (#14,23) o o S o Q:SIbo o 0 o o o Q HUNTER FRACTURE ZONE (#2,10) CENTRAL NORTH FIJI BASIN (# 1,3,4,6,9,11) E Figure 4. Interpreted focal mechanism solutions for the North Fiji Basin. Mechanism parameters are given in Table 1. Strike of preferred plane ofvertical dip-slip mechanisms is shown, with sense ofmotion given by U (up) and D (down).

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