Geology of the Salt Lake Area, Oahu, Hawaii

dc.contributor.author Pankiwskyj, Kost A.
dc.date.accessioned 2008-02-08
dc.date.available 2008-02-08
dc.date.issued 1972-04
dc.description.abstract ABSTRACT: A series of pyroclastic eruptions and one lava flow, all of melilitenephelinite composition, were produced in the environs of present-day Salt Lake, Oahu, Hawaii, beginning about 500,000 years ago and terminating more than 100,000 years ago. The age of the flow has been dated by a K40/ A40 method at 400,000 years to 470,000 years. The earliest eruptions took place at a time of higher sea levels than at present, and their products are water-laid. Later eruptions, including the major ones from Salt Lake Crater and Makalapa Crater, took place at a time of lower sea levels than at present, and their products are air-laid. Sufficient time elapsed between individual eruptions to allow for erosion of portions of the earlier cones, to deposit silt and gravel, or to develop a soil prior to a subsequent eruption. The pyroclastics are medium- to fine-grained, lithic-vitric tuffs and contain, in addition to juvenile material, a considerable quantity of particles of older rocks-volcanic and sedimentary, as well as ultramafic. The youngest deposits of tuff are unconformably truncated by reef and limestone which have been correlated with rocks dated by a Th23o/UZ38 method at 90,000 to 140,000 years.
dc.identifier.citation Pankiwskyj KA. 1972. Geology of the Salt Lake area, Oahu, Hawaii. Pac Sci 26(2): 242-253.
dc.identifier.issn 0030-8870
dc.identifier.uri http://hdl.handle.net/10125/404
dc.language.iso en-US
dc.publisher University of Hawai'i Press
dc.subject.lcsh Geology -- Hawaii -- Oahu
dc.title Geology of the Salt Lake Area, Oahu, Hawaii
dc.type Article
dc.type.dcmi Text
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