High-pressure phase equilibria of a high-magnesia basalt and the genesis of primary oceanic basalts

High-P phase equilibria studies on a high-MgO basalt from the Tortuga ophiolite complex indicate that olivine + orthopyroxene + clinopyroxene + garnet are its liquidus phases at 25 kbar. The data are combined with results obtained on other tholeiitic basalt compositions, and are used to construct ps...

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Bibliographic Details
Published inThe American mineralogist Vol. 69; no. 1-2; pp. 1 - 15
Main Authors Elthon, Don, Scarfe, Christopher M
Format Journal Article
LanguageEnglish
Published Mineralogical Society of America 01.02.1984
Subjects
Baffin Bay
basalts
Betts Cove Ophiolite
Canada
chain silicates
clinopyroxene
composition
crust
Eastern Canada
feldspar group
framework silicates
garnet
Gorgona Island
high pressure
igneous and metamorphic rocks
igneous rocks
Lewis Hills Ophiolite
magmas
mantle
nesosilicates
Northwest Territories
olivine
olivine group
Ordovician
orthopyroxene
orthosilicates
oxides
Paleozoic
petrology
phase equilibria
plagioclase
pressure
pyroxene group
Quebec
silicates
spinel
Tortuga Ophiolite
Ungava
volcanic rocks
Western Canada
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Summary:High-P phase equilibria studies on a high-MgO basalt from the Tortuga ophiolite complex indicate that olivine + orthopyroxene + clinopyroxene + garnet are its liquidus phases at 25 kbar. The data are combined with results obtained on other tholeiitic basalt compositions, and are used to construct pseudoliquidus phase diagrams for evaluating and predicting the nature of primary magmas and melting of the mantle at high P.
ISSN:0003-004X
1945-3027