Figure F46. Apparent geothermal gradient at Site U1328 calculated from temperature data obtained during Expedition 311 and ODP Leg 146. See text for further discussion of uncertainties. The stability boundary for methane hydrate at hydrostatic pressure is shown (calculated using CSMHY; Sloan, 1998) for a seawater salinity of 3.5% and for an interstitial water salinity of 3% in the vicinity of the bottom-simulating reflector (BSR) (see "Interstitial water geochemistry"). BSR depth based on seismic data, base of gas hydrate stability zone (GHSZ) based on thermal gradient.
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