Figure F2. Nitrogen concentrations and isotopic compositions at Sites 1040, 1254 and 1255. Patterned areas represent fault zones and the décollement. Note the covariation and significant downhole increase in N concentrations and isotopic compositions of sediments and ammonium compositions of interstitial fluid. Also noteworthy is the hint of change in N concentrations and isotopic compositions of sediments along contacts between fault zones and wall sediments. A. Downhole variation of N concentrations of sediments. The data from Site 1040 are consistent with those for Sites 1254 and 1255, as well as those presented for Site 1040 by Kimura, Silver, Blum, et al., 1997. B. Downhole delta15N variation of sediments. Data from Sites 1040, 1254, and 1255 are consistent with each other. C. Downhole variation of ammonium concentrations of interstitial fluid. Data from Kimura, Silver, Blum, et al., 1997.

Figure F2. Nitrogen concentrations and isotopic compositions at Sites 1040, 1254 and 1255. Patterned areas represent fault zones and the décollement. Note the covariation and significant downhole increase in N concentrations and isotopic compositions of sediments and ammonium compositions of interstitial fluid. Also noteworthy is the hint of change in N concentrations and isotopic compositions of sediments along contacts between fault zones and wall sediments. A. Downhole variation of N concentrations of sediments. The data from Site 1040 are consistent with those for Sites 1254 and 1255, as well as those presented for Site 1040 by Kimura, Silver, Blum, et al., 1997. B. Downhole

¹⁵N variation of sediments. Data from Sites 1040, 1254, and 1255 are consistent with each other. C. Downhole variation of ammonium concentrations of interstitial fluid. Data from Kimura, Silver, Blum, et al., 1997.