Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0-30 kbar

Article Abstract:

Geothermobarometers of mafic rocks, at 0-30 kbar and 1100-1475 degrees celsius, include thermodynamic expressions relating temperature and pressure to equilibrium constants. The high thermodynamic expression of jadite (Jd)-liquid equilibrium is used as the basis of geobarometer. Exchange equilibria include solutions of Jd and Calcium Tschermak's component into diopside-heden-bergite and are less pressure sensitive. The application of thermobarometers to pyroxene-bearing rocks from Mauna Kea, Hawaii, indicates rapid transport at great depths and disequilibrium at lower pressures.

Rocks, Igneous, Igneous rocks, Thermometers, Jadeite (Petrology), Jadeite

---

Melting experiments on the enstatite-diopside join at 70-224 kbar, including the melting of diopside

Article Abstract:

Experiments at 70-224 kbar, using a split-sphere anvil apparatus, reveal the melting relations on the enstatite-diopside join. For low pressures, melting in the enstatite-rich compositions is peritectic that turns eutectic at higher pressures. The diopside-rich clinopyroxene experiences azeotropic melting at 70-165 kbar and at temperatures lower than the eutectic. Relationships with the coexisting garnets and perovskites are studied with the help of the melting curve of diopside. Applications of the calculated temperature-pressure phase diagram from the study are discussed.

Models, Usage, Phase diagrams, Pyroxene

---

Similar abstracts:

• Abstracts: An empirical study of the economic effects of climate change on world agriculture. Societal adaptation to climate variability and change: an introduction
• Abstracts: Collapse of the Luzon volcanic arc during onset of arc-continent collision: evidence from a Miocene-Pliocene unconformity, Eastern Taiwan
• Abstracts: Synconvergence spreading of the Higher Himalaya Crystalline in Ladakh. Some thermal and paleomagnetic consequences of tilting a batholith
• Abstracts: A tectonic model for Scandanian terrane accretion in the northern Scandinavian Caledonides. Diachronous cleavage development in the Robertson Bay terrane, Northern Victoria Land, Antarctica: tectonic implications

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.