Iron-titanium oxide minerals in layered gabbros of the Skaergaard intrusion, East Greenland : Part II. Magnetic properties
Measurements of the magnetic constants of chemically analyzed titaniferous magnetites from the Skaergaard intrusion indicate that FeTiO 3 is completely exsolved as lalmenite lamellae. Up to about 6% Fe 2TiO 4, however, may remain in solid solution, the amount appearing to be more closely related to the temperature of consolidation of the rock than to the total Fe 2TiO 4 content of the mineral. The magnetic measurements provide a completely independent estimate of the Fe 2O 4 contents of the samples, which show good agreement with values calculated from chemical analyses. The coexisting ilmenites show little variation in magnetic properties; in particular there is no close relationship between magnetic properties and content of Fe 2O 3.