Iron-titanium oxide minerals in layered gabbros of the Skaergaard intrusion, East Greenland : Part I. Chemistry and ore-microscopy

Details Iron-titanium oxide minerals in layered gabbros of the Skaergaard intrusion, East Greenland : Part I. Chemistry and ore-microscopy Iron-titanium oxide minerals in layered gabbros of the Skaergaard intrusion, East Greenland : Part I. Chemistry and ore-microscopy

Jul 1954

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954gecoa...6....1v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 6, Issue 1, pp.1-4

Computer Science

19

Scientific paper

The microscopic characters and chemical compositions of coexisting magnetites and ilmenites in a suite of differentiated gabbros are discussed. Textures of the minerals suggest that some discrete crystals of ilmenite owe their origin to complete exsolution from an originally homogeneous high-temperature solid solution. The magnetites contain exsolution bodies of ilmenite and sometimes of ulvöspinel, Fe 2 TiO 4 , those of rocks rich in opaque oxides carrying much more ulvöspinel than those of average rocks at the same horizons in the intrusion; leading to the conclusion that the magnetite compositions are largely determined by oxidation-reduction equilibria between ferrous and ferric oxides and oxygen in the crystallizing magma. The variation in contents of Mg, Co, Mn, Zn, Cu, Al, Cr and V in both magnetites and ilmenites is discussed. In the magnetites these vary much less than FeO, Fe 2 O 3 and TiO 2 between melanocratic and average bands at the same horizon and reflect both their ease of entry into the minerals and their availability in the magma at each stage.

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