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Geology of the Salt Lake Area, Oahu, Hawaii

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Title:Geology of the Salt Lake Area, Oahu, Hawaii
Authors:Pankiwskyj, Kost A.
LC Subject Headings:Geology -- Hawaii -- Oahu
Date Issued:Apr 1972
Publisher:University of Hawai'i Press
Citation:Pankiwskyj KA. 1972. Geology of the Salt Lake area, Oahu, Hawaii. Pac Sci 26(2): 242-253.
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.
Appears in Collections: Pacific Science Volume 26, Number 2, 1972

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