Petrology and Geochemistry of Boninite Series Volcanic Rocks,Chichi-jima, Bonin Islands, Japan

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An Eocene submarine boninite series volcanic center isexposed on the island of Chichi-jima, Bonin Islands, Japan. Five rocktypes, boninite, bronzite andesite, dacite, quartz dacite, and rhyolite,were distinguished within the boninite volcanic sequence on the basis ofpetrographic and geochemical observations. Boninite lavas contain highmagnesium, nickel, and chromium contentsindicative of primitive melts,but have high silica contents relative to other mantle-derived magmas.All boninite series lavas contain very low incompatible elementconcentrations, and concentrations of high-field strength elements inprimitive boninite lavas are less than half of those found in depletedmid-ocean ridge basalts. Abundances of large-ion lithophile elements arerelatively high in boninite series lavas, similar to ... continued below

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Dobson, Patrick F.; Blank, Jennifer G.; Maruyama, Shigenori & Liou, J.G. January 1, 1977.

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An Eocene submarine boninite series volcanic center isexposed on the island of Chichi-jima, Bonin Islands, Japan. Five rocktypes, boninite, bronzite andesite, dacite, quartz dacite, and rhyolite,were distinguished within the boninite volcanic sequence on the basis ofpetrographic and geochemical observations. Boninite lavas contain highmagnesium, nickel, and chromium contentsindicative of primitive melts,but have high silica contents relative to other mantle-derived magmas.All boninite series lavas contain very low incompatible elementconcentrations, and concentrations of high-field strength elements inprimitive boninite lavas are less than half of those found in depletedmid-ocean ridge basalts. Abundances of large-ion lithophile elements arerelatively high in boninite series lavas, similar to the enrichmentsobserved in many island arc lavas. Trends for both major and traceelement data suggest that the more evolved lavas of the boninite magmaseries were derived primarily through high-level fractionalcrystallization of boninite. Textural features, such as resorption andglomeroporphyrocrysts, and reverse chemical zonations suggest that magmamixing contributed to the development of the quartz dacitelavas.

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  • Journal Name: International Geology Review; Journal Volume: 48; Journal Issue: 8; Related Information: Journal Publication Date: 08/2006

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  • Report No.: LBNL--57671
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 900702
  • Archival Resource Key: ark:/67531/metadc890845

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1977

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  • Sept. 22, 2016, 2:13 a.m.

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  • Oct. 3, 2017, 2:02 p.m.

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Dobson, Patrick F.; Blank, Jennifer G.; Maruyama, Shigenori & Liou, J.G. Petrology and Geochemistry of Boninite Series Volcanic Rocks,Chichi-jima, Bonin Islands, Japan, article, January 1, 1977; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc890845/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.