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ABSTRACT. Black, opaque grains of a spinel whose composition is (Mg2TiO4) 85.8, (MgFe204) 0.4 (FeFe204) 13.8 (mole %) coexist with a MgA1204 spinel and geikielite in a periclase-forsterite marble that has been thermally metamorphosed against an alkalic ultra-mafic intrusion of Caledonian age in the...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.604.1703 http://www.minersoc.org/pages/Archive-MM/Volume_45/45-337-135.pdf |
| Summary: | ABSTRACT. Black, opaque grains of a spinel whose composition is (Mg2TiO4) 85.8, (MgFe204) 0.4 (FeFe204) 13.8 (mole %) coexist with a MgA1204 spinel and geikielite in a periclase-forsterite marble that has been thermally metamorphosed against an alkalic ultra-mafic intrusion of Caledonian age in the Kangerdlugs-suaq region of East Greenland. The spinel appears to be the closest recorded approach to the end-member Mg2TiO 4 among natural rocks, and to be part of a solid-solution series extending across the join Mg2TiO4-MgFe204-FeFe204, the existence of which has not previously been reported. The composition ofthe series appears to be controlled by thefo2 that prevails during metamorphism. THE compound Mg2TiO4 is a recognized end- |
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