Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0-30 kbar
- Author:
-
Putirka, Keith, Johnson, Marie, Kinzler, Rosamond, Longhi, John, Walker, David
- Title:
- Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0-30 kbar
- Periodical:
- Contributions to Mineralogy and Petrology
- Year:
- 1996
- Volume:
- 123
- Pages:
- 92-108
- Subject:
-
Magma
Rocks igneous Mauna Kea
Mauna Kea volcano
- Summary:
- Although many pyroxenes have been synthesized at high pressure, few studies have focused on growing pyroxenes from a single liquid composition over a wide pressure range. Further, many experiments have been geared toward understanding mid-ocean ridge magmatism and thus encompass a narrow range of starting compositions. As a result, the goal of this study was to produce thermobarometers of general applicability and experiments were performed to broaden the existing database. The thermobarometric models applied to rocks from Mauna Kea, Hawaii, result in transport depths up to 40 km for ankaramites. The agreement of depth estimate for mafic rocks from Hawaii with depths observed for tremors suggests that volcanic rocks may be moved from substantial depth without significant re-equilibration of liquid and coexisting pyroxene. It also indicates that the mechanical behavior of the lithosphere, not density contrasts, controls magma storage at depth below Hawaii.
- Label:
- Geology
- Collection:
- Periodicals