EarthRef.org Reference Database (ERR) -- Washington 1923

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Washington 1923

Washington, H.S. (1923). Petrology of the Hawaiian Islands; IV, The Formation of aa and pahoehoe. American Journal of Science 6: 409-423.

Washington reviews previous ideas on the formation of aa and pahoehoe. He shows that the difference in state of oxidation of the iron, and other chemical differences between aa and pahoehoe, are insignificant. He believes pahoehoe to be generally less crystalline and poorer in gas than aa. Aa remains more fluid than pahoehoe, losing its gas more slowly, both temperature and gas content being partially maintained by crystallization. Aa cools more slowly than pahoehoe, and therefore crystallizes more completely.

Keywords
Aa and pahoehoe; East Pacific Ocean Islands; formation; Hawaii;, igneous and volcanic rocks; igneous rocks; Oceania; petrology;, Polynesia; United States, 05, Igneous and metamorphic petrology

Journal
American Journal of Science
http://plate.geology.yale.edu/level5/Ajs.html

Publisher
The American Journal of Science, Yale University
P.O. Box 208109
New Haven, CT 06520-8109
USA
203-432-3131
203-432-5668
ajs@yale.edu