Figure F3. Pore fluid Ba and SO4 concentration depth profiles along the transect across the Middle America Trench. A, C. Ba and SO4 concentrations at Sites 1039/1253. B, D. Ba and SO4 concentrations at Sites 1254/1040. Dashed red lines in A and C are the sill depths in Holes 1039B and 1039C. Thin gray shaded area is the sill at Site 1253, and the thick gray shaded area is the igneous complex. Black field in B and D is the upper fault zone (UFZ), the area delineated by blue lines is the décollement at Site 1254, and the area delineated by the solid red lines is the décollement at Site 1040. SO4 concentrations are from Kimura, Silver, Blum, et al. (1997) and Morris, Villinger, Klaus, et al. (2003). BW = bottom water Ba concentration for the region (Parsons et al. [N1]), SW = seawater, ICP-OES = inductively coupled plasma–optical emission spectrometry, ICP-MS= inductively coupled plasma

Figure F3. Pore fluid Ba and SO₄ concentration depth profiles along the transect across the Middle America Trench. A, C. Ba and SO₄ concentrations at Sites 1039/1253. B, D. Ba and SO₄ concentrations at Sites 1254/1040. Dashed red lines in A and C are the sill depths in Holes 1039B and 1039C. Thin gray shaded area is the sill at Site 1253, and the thick gray shaded area is the igneous complex. Black field in B and D is the upper fault zone (UFZ), the area delineated by blue lines is the décollement at Site 1254, and the area delineated by the solid red lines is the décollement at Site 1040. SO₄ concentrations are from Kimura, Silver, Blum, et al. (1997) and Morris, Villinger, Klaus, et al. (2003). BW = bottom water Ba concentration for the region (Parsons et al. [N1]), SW = seawater, ICP-OES = inductively coupled plasma–optical emission spectrometry, ICP-MS= inductively coupled plasma–mass spectrometry.