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Aramaki & Moore 1969

Aramaki, S. and Moore, J.G. (1969). Chemical composition of prehistoric lavas at Makaopuhi Crater, Kilauea Volcano, and periodic change in alkali content of Hawaiian tholeiitic lavas. Bulletin of Earthquake Research and Geophysical Institute 47(2): 257-270.

The K (sub 2) O/Na (sub 2) O ratio and, to a lesser degree, Na (sub 2) O + K (sub 2) O of prehistoric tholeiitic lavas exposed on the wall of Makaopuhi crater, Kilauea Volcano, show periodic change with time. Similar variation is found in the lower member of Waianae Volcano, Oahu Island. Marked increase in the K (sub 2) O/Na (sub 2) O ratio of the historic lavas of Kilauea as compared with that of early historic and many prehistoric lavas of the same volcano may correspond to a part of such periodic variations in the ratio as represented by the above two examples. As one possible mechanism for such increase in ratio, fractional crystallization of K (sub 2) O-poor plagioclase is proposed.

Keywords
chemical composition; composition; East Pacific Ocean Islands;, Hawaii; Hawaii County Hawaii; Hawaii Island; igneous rocks;, Kilauea; lava; Makaopuhi Crater; Oceania; petrology; Polynesia;, tholeiitic composition; tholeiitic lava; United States; volcanic, rocks; volcanoes; Waianae volcano, 24, Quaternary geology

Journal
Bulletin of Earthquake Research and Geophysical Institute