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