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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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We report on a CCOP/SOPAC coordinated cruise, funded by Australia, New Zealand, and the United States (ANZUS), that surveyed the Central basin of Vanuatu (former New Hebrides) in May 1982, to examine the hydrocarbon potential of the region. Our work was concentrated primarily in the Big Bay-Jorden River graben area and along the eastern flanks of Espiratu Santo and Malekula Islands, where we examined structural and stratigraphic characteristics in detail. The collection of continuous multichannel seismic, single-channel intermediate penetration and high-resolution seismic, magnetic, and gravimetric profiles provided significant new data for the evaluation of oil and gas traps and geologic hazards.
The region is an active volcanic arc that overlies an east-dipping seismic (Benioff) zone. Geologic history of the region is complex because subduction directions shifted from east to west in post middle Miocene time. Subsequent tectonism resulted in block faulting of upper Tertiary sedimentary and volcanic rocks, forming islands with narrow shelves and intervening deep-water basins.
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