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- W2037494018 abstract "Abstract At Ocean Drilling Program Site 997 in Blake Ridge gas‐hydrate field in West Atlantic, pore‐water studies revealed a pronounced downward depletion of the heavy chlorine isotope to nearly −4‰ δ 37 Cl at approximately 750 m below sea floor (mbsf) associated with a 10% downward chlorinity decrease. This is one of the stronger 37 Cl depletions hitherto reported for marine pore waters. Chlorinity reductions in hydrate‐bearing sediments commonly result from fresh‐water release by hydrate melting. However, in situ measurements at Site 997 suggest that >50% of the chlorinity reduction occurred prior to hydrate dissociation. Modeling the chlorinity profile shows that advection of a strongly 37 Cl‐depleted, low‐chlorinity water (506 m m ) from below the drilled sequence can explain the reduction prior to sampling. Fitting the model to the δ 37 Cl curve yielded an advection rate of 0.18 mm year −1 . Diffusive mixing with near‐0‰‐ δ 37 Cl paleo‐seawater with maximum chlorinity at shallow subsurface depths (561 m m at approximately 20 mbsf) produced the smooth, steady trend. Separating that part of the freshening caused by advection and diffusion from that due to hydrate dissociation allowed estimation of average hydrate concentrations of 3.8% of the pore space (up to 24.5% in hydrate‐rich layers; near‐100% in rare massive hydrate layers). The deep‐seated source of the 37 Cl‐depleted, low‐chlorinity water remains unknown and might be located below the sedimentary section in the oceanic basement." @default.
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- W2037494018 date "2006-01-23" @default.
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- W2037494018 title "Chlorine stable isotope ratios as tracer for pore-water advection rates in a submarine gas-hydrate field: implication for hydrate concentration" @default.
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- W2037494018 doi "https://doi.org/10.1111/j.1468-8123.2006.00123.x" @default.
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