Figure F5. Molar Mg# (Mg/[Mg+Fe]) vs. Zr concentration in mid-ocean-ridge basalt (MORB) and oceanic gabbro samples. MORB glass data were downloaded in April 2003 from PetDB (petdb.ldeo.Columbia.edu/petdb). Other data: "average" normal MORB (NMORB; Hofmann, 1988); average composition of gabbroic rocks from ODP Hole 735B on the Southwest Indian Ridge (Natland and Dick, 2002); and average composition of gabbroic rocks from ODP Leg 153 on the Mid-Atlantic Ridge (MAR; Agar and Lloyd, 1997).

Figure F5. Molar Mg# (Mg/[Mg+Fe]) vs. Zr concentration in mid-ocean-ridge basalt (MORB) and oceanic gabbro samples. MORB glass data were downloaded in April 2003 from PetDB (petdb.ldeo.Columbia.edu/petdb). Other data: "average" normal MORB (NMORB; Hofmann, 1988); average composition of gabbroic rocks from ODP Hole 735B on the Southwest Indian Ridge (Natland and Dick, 2002); and average composition of gabbroic rocks from ODP Leg 153 on the Mid-Atlantic Ridge (MAR; Agar and Lloyd, 1997).