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Torres, Marta E; Teichert, Barbara M A; Tréhu, Anne M; Borowski, Walter S; Tomaru, Hitoshi (2004): (Table 1) Depth to basement, accreted melange, bottom simulating reflector and sediment penetration in meters below seafloor. PANGAEA,, Supplement to: Torres, ME et al. (2004): Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance. Geophysical Research Letters, 31(22), 1-4,

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Drilling in the Cascadia accretionary complex enable us to evaluate the contribution of dehydration reactions and gas hydrate dissociation to pore water freshening. The observed freshening with depth and distance from the prism toe is consistent with enhanced conversion of smectite to illite, driven by increase in temperature and age of accreted sediments. Although they contain gas hydrate -as evidenced by discrete low chloride spikes- the westernmost sites drilled on Hydrate Ridge show no freshening trend with depth. Strontium data reveal that all the mélange samples contain deep fluids modified by reaction with the subducting oceanic crust. Thus we infer that, at the westernmost sites, accretion is too recent for the sediments to have undergone significant illitization. Our data demonstrate that a smooth decrease in dissolved chloride with depth cannot generally be used to infer the presence or to estimate the amount of gas hydrate in accretionary margins.
Median Latitude: 45.682237 * Median Longitude: -125.710398 * South-bound Latitude: 44.570217 * West-bound Longitude: -127.730333 * North-bound Latitude: 48.732067 * East-bound Longitude: -125.074000
Date/Time Start: 1992-09-27T00:00:00 * Date/Time End: 2002-09-01T00:00:00
Minimum Elevation: -2656.7 m * Maximum Elevation: -685.1 m
146-888 * Latitude: 48.166800 * Longitude: -126.663117 * Date/Time Start: 1992-09-27T00:00:00 * Date/Time End: 1992-10-05T00:00:00 * Elevation: -2527.0 m * Penetration: 1176.4 m * Recovery: 374.6 m * Location: North Pacific Ocean * Campaign: Leg146 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 66 cores; 576.4 m cored; 600 m drilled; 65% recovery
146-889 * Latitude: 48.732067 * Longitude: -126.869850 * Date/Time Start: 1992-10-05T00:00:00 * Date/Time End: 1992-10-18T00:00:00 * Elevation: -1324.2 m * Penetration: 1270.8 m * Recovery: 284.6 m * Location: North Pacific Ocean * Campaign: Leg146 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 68 cores; 538.8 m cored; 384.5 m drilled; 52.8% recovery
146-892 * Latitude: 44.674317 * Longitude: -125.118817 * Date/Time Start: 1992-11-06T00:00:00 * Date/Time End: 1992-11-17T00:00:00 * Elevation: -685.1 m * Penetration: 753 m * Recovery: 155.2 m * Location: North Pacific Ocean * Campaign: Leg146 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 42 cores; 353 m cored; 178.5 m drilled; 44% recovery
Distance to the prism toe in kilometers +-1.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Depth, bottom/maxDepth botmTorres, Marta EBasement
3Lithology/composition/faciesLithologyTorres, Marta EMelange
4Depth, bottom/maxDepth botmTorres, Marta EBSR
5Penetration depthPenetr depthmTorres, Marta E
6DistanceDistancekmTorres, Marta EDistance to Prism Toe
36 data points

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