fig07.htm

Figure 7. Diagram of FeO+Fe2O3/FeO+Fe2O3 +MgO versus TiO2 averages reflecting the differentiation trend of basaltic magma (see the text for the regions included). The solid circles are oceanic basalts and basalts containing xenoliths, open squares are gabbros from the ocean floor and xenoliths, and solid triangles are Patynskii intrusive rocks ranging from primary nonmagnetic olivine gabbros to highly magnetic ferrogabbros. The broken line bounds the region of primary nonmagnetic gabbros. Points close to (FeO+Fe2O3/FeO+Fe2O3 +MgO approx 0.57, TiO2approx1.5 ) correspond to the original basaltic magma. The crystallization differentiation generally trends from cumulates (bottom) to ferrogabbros (top).


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