Herzer, R. H.; Challis, G. A.; Christie, R. H. K.; Scott, G. H.; Watters, W. A. (1989): The Urry Knolls, late Neogene alkaline basalt extrusives, southwestern Chatham Rise. Royal Society of New Zealand, Wellington, New Zealand, Journal of the Royal Society of New Zealand, 19 (2), 181-193, georefid:1989-063348

A little studied group of submarine volcanoes, the Urry Knolls, lies on the southern flank of Chatham Rise some 200 km ESE of Banks Peninsula, South Island. Individually, the volcanoes form small cones a few kilometres across and several hundred metres high. Some straddle small ridges, implying eruption from fissures. Buried lava flows or shallow intrusions are common. Vesicular olivine basalts dredged from one of the peaks are hawaiites of "within-plate alkaline" and "ocean-island alkaline" affinities, and similar in mineralogy and chemistry to basalts from Chatham Island and Banks Peninsula. They may have been active as early as upper Late Miocene time and as late as Mangapanian to basal Castlecliffian (latest Pliocene-early Pleistocene) time.
West: 174.3000 East: 174.5653 North: -43.0000 South: -45.3129
West: NaN East: NaN North: NaN South: NaN
Expedition: 90
Site: 90-594
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=1989-063348 (c.f. for more detailed metadata)
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