Figure F78. Zr/TiO2 and Zr/Y for first-order mid-ocean-ridge segments along the East Pacific Rise from 14°N to 19°S and at Site 1256 (Leg 206 and Expedition 309). Zr and Y data are taken from PetDB (online at petdb.org/index.jsp), and plotted values are the average of segment centers. Error bars are 1 σ, representative of within-segment variation. Spreading rate of each segment is calculated using the online ridge spreading rate calculator (www.ldeo.columbia.edu/users/menke/plates.html); spreading rate of Site 1256 is from Wilson (1996). Latitude range for each segment center is indicated by labels beneath the X-axis, and numbers above the X-axis are the full spreading rate of each segment.
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