Mineral chemistry of submarine lavas from Hilo Ridge, Hawaii: implications for magmatic processes within Hawaiian rift zones

Author:

Yang, Huai-Jen, Frey, Frederick A., Clague, David A., Garcia, Michael O.

Title:

Mineral chemistry of submarine lavas from Hilo Ridge, Hawaii: implications for magmatic processes within Hawaiian rift zones

Periodical:

Contributions to Mineralogy and Petrology

Year:

1999

Volume:

135

Pages:

355-372

Subject:

Volcanoes Hilo Ridge Olivine Lava analysis

Summary:

The crustal history of volcanic rocks can be implied from the mineralogy and compositions of their phenocrysts that record episodes of magma mixing and the pressures and temperatures when magmas cooled. Most of the well documented cases for mixing of Hawaiian lavas are for lavas that were erupted from active volcanoes such as Kilauea and Mauna Loa. The goal of this detailed study was to use phenocryst compositions in olivine-rich tholeiitic basalts in Hawaiian lavas in an effort to understand the processes that occur in Hawaii rift zones. Submarine lavas were studied that erupted on a Hilo ridge, a rift zone directly east of Mauna Kea volcano, that contained olivine, spinel, plagioclase, augite and orthopyroxene. Olivine was the most abundant phenocryst and microphenocryst. Plagioclase and augite that usually occurred as microphenocrysts with Plagioclase being slightly more abundant that augite. Orthopyroxene was rare, and Spinel appeared as inclusions in olivine but was not analyzed.

Label:

Geology

URL:

http://cletus.uhh.hawaii.edu:2074/10.1007/s004100050517

Date:

June 1999

Collection:

Periodicals