UH Hilo Center for Maunakea Stewardship - Research Library

The role of tonalite and diorite in Mauna Kea Volcano, Hawaii, magmatism: petrology of summit-region leucocratic xenoliths

Author:
Fodor, R.V.
Title:
The role of tonalite and diorite in Mauna Kea Volcano, Hawaii, magmatism: petrology of summit-region leucocratic xenoliths
Periodical:
Journal of Petrology
Year:
2001
Volume:
42
Pages:
1685-1704
Subject:
Cumulates Gabbro Mauna Kea volcano Quartz Xenoliths
Summary:
The tonalite has interstitial quartz poikilitically enclosing plagioclase and a positive Eu anomaly that suggests that this leucocratic xenolith has a cumulate origin. The isotopic compositions identify the tonalite as belonging to the Hamakua post-shield magmatism or to the Mauna Kea sheild that is that is located on the island of Hawaii. Mauna Kea is a volcano that is one of five shield volcanoes that is comprised of a tholeiitic shield capped by post-shield lavas of both tholeiitic and alkalic affinities that reach an altitude of 4206 meters. The leucocratic xenoliths are the focus of this study, and through their petrography and whole-rock and mineral compositions provide insights into reservoir crystallization processes that are not manifested by erupted magmas. Of particular interest, is the presence of quartz-bearing tonalite in an intraplate oceanic environment.
URL:
https://doi.org/10.1093/petrology/42.9.1685
Date:
2001September
Collection:
Periodicals