Figure F2. Leg 168 transect and locations of Second Ridge (SR), First Ridge (FR), and Deep Ridge (DR) drilling sites. Top: Interpretation of seismic data along Leg 168 drilling transect, showing sediment thickness, basement relief, and depths of existing (thin, solid lines) and proposed (thick, dashed lines) holes. Middle: Measured (solid) and anticipated (open) upper basement temperatures, based on results from Leg 168 and regional surveys. Bottom: Mg concentrations from uppermost basement pore fluids and apparent 14C ages of these fluids. Note the relative youth of SR fluids, thought to recharge through a large basaltic outcrop, 52 km to the south. See text and drilling proposal for discussion and references.
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