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Item Description Walker, George P.L. en_US 2008-06-06T08:03:32Z 2008-06-06T08:03:32Z 1992-01 en_US
dc.identifier.citation Walker GPL. 1992. Puu Mahana near South Point in Hawaii is a primary Surtseyan ash ring, not a sandhills-type littoral cone. Pac Sci 46(1): 1-10. en_US
dc.identifier.issn 0030-8870 en_US
dc.description.abstract Puu Mahana has previously been interpreted to be a littoral cone, formed at a secondary rootless vent where lava flowed from land into the ocean, but a number of lines of evidence point to it being a remnant of a Surtseyan tuff ring built on a primary vent. The differences between it and littoral cones are highlighted by a comparison of Puu Mahana with the undoubted littoral cone of the Sandhills that was observed to form in the 1840 flank eruption of Kilauea Volcano. Puu Mahana contains abundant lithic debris and accretionary lapilli, absent in the Sandhills deposit. Compared with the Sandhills, the Puu Mahana pyroclastic deposit is finer grained and more poorly sorted, and its juvenile component is less dense and more highly vesiculated. Puu Mahana lies 3 to 4 km offMauna Loa's southwest rift zone. Identification of it as a primary vent implies that the lower rift zones of Hawaiian volcanoes can be much wider and more diffuse or more mobile than is currently acknowledged. The olivine grains that compose the well-known green-sand beach at Puu Mahana are likely derived from the ash, strongly concentrated and somewhat abraded by wave action. en_US
dc.language.iso en-US en_US
dc.publisher University of Hawai'i Press en_US
dc.title Puu Mahana Near South Point in Hawaii Is a Primary Surtseyan Ash Ring, Not a Sandhills-type Littoral Cone en_US
dc.type Article en_US
dc.type.dcmi Text en_US

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