Abstract
The occurrence in time and space of Tertiary intraplate central volcanoes and associated lava fields in the eastern Australia-New Zealand-Campbell Plateau region of the Southwest Pacific is more consistent with derivation from a large-scale mantle anomaly than from discrete plumes. The basalt volcanics from the eastern part of the region show a pronounced geochemical similarity; those near the Indo-Australia-Pacific convergent plate boundary show some evidence of interaction with subduction-derived basalts. The lithospheric swells expected, associated with the eruption of magma to form these volcanoes, seem broadly correlative with sedimentary patterns off the east coast of Australia and the west coast of New Zealand at this time.
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