Comparison of Rhizon Sampling and Whole Round Squeezing for Marine Sediment Porewater

Schrum, H. N.; Murray, Richard W; Gribsholt, B.

doi:10.2204/iodp.sd.13.08.2011

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…Carbonate alkalinity (HCO 3 2 1 2 3 CO 3 22 ) was determined via Gran titration. No corrections were applied to measured carbonate alkalinity concentrations for the possible presence of HS 2 or for precipitation of calcium carbonate [Schrum et al, 2012]. The d 18 O and dD of pore water samples were measured by Isotech Laboratories.…”

Section: Mud Volcanoesmentioning

confidence: 99%

Active mud volcanoes on the continental slope of the Canadian Beaufort Sea

Paull

Dallimore

Caress

et al. 2015

Geochem Geophys Geosyst

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Morphologic features, 600-1100 m across and elevated up to 30 m above the surrounding seafloor, interpreted to be mud volcanoes were investigated on the continental slope in the Beaufort Sea in the Canadian Arctic. Sediment cores, detailed mapping with an autonomous underwater vehicle, and exploration with a remotely operated vehicle show that these are young and actively forming features experiencing ongoing eruptions. Biogenic methane and low-chloride, sodium-bicarbonate-rich waters are extruded with warm sediment that accumulates to form cones and low-relief circular plateaus. The chemical and isotopic compositions of the ascending water indicate that a mixture of meteoric water, seawater, and water from clay dehydration has played a significant role in the evolution of these fluids. The venting methane supports extensive siboglinid tubeworms communities and forms some gas hydrates within the near seafloor. We believe that these are the first documented living chemosynthetic biological communities in the continental slope of the western Arctic Ocean.

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Section: Mud Volcanoesmentioning

confidence: 99%

Active mud volcanoes on the continental slope of the Canadian Beaufort Sea

Paull

Dallimore

Caress

et al. 2015

Geochem Geophys Geosyst

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“…The first technique has been used routinely during scientific ocean drilling expeditions for nearly four decades (Manheim and Sayles, 1974;Sayles and Manheim, 1975;Gieskes, 1975), and resultant waters are commonly referred to as interstitial water samples. The second technique was first used for scientific drilling during IODP Expedition 302 in 2004 and has steadily become more common (e.g., Expedition 320/321 Scientists, 2010b; Schrum et al, 2012). Each technique appears to have advantages and disadvantages, but a series of unanswered questions surrounds the use of Rhizons.…”

Section: Interstitial Water Samplingmentioning

confidence: 99%

Methods

Tada¹,

Murray²,

Zarikian³

et al. 2015

Proceedings of the IODP

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“…Dickens et al [2007] compared the manganese and ammonium concentrations in samples recovered with Rhizons versus those recovered through squeezing, concluding that Rhizons had no deleterious effect on the samples, but their study only compared a few overlapping Rhizon and squeeze samples (six points). Schrum et al [2012] made a more comprehensive study of alkalinity, dissolved inorganic carbon (DIC), ammonium, sulfate, and chloride. They found that the alkalinity and DIC in the Rhizon samples were compromised, presumably due to a loss of carbon dioxide and resultant precipitation of calcium carbonate, but concluded that ammonium, sulfate, and chloride were unaffected.…”

Section: Introductionmentioning

confidence: 99%

Rhizon sampler alteration of deep ocean sediment interstitial water samples, as indicated by chloride concentration and oxygen and hydrogen isotopes

Miller

Adkins

Hodell

2014

Geochem Geophys Geosyst

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Despite their potential to inform past ocean salinity, d18 O, and temperature, high-resolution depth profiles of interstitial water chloride concentration and hydrogen and oxygen isotopes exist in very few locations. One of the primary limitations to the recovery of these depth profiles is that traditional interstitial water sampling requires 5-10 cm whole rounds of the sediment core, which has the potential to interfere with stratigraphic continuity. The Rhizon sampler, a nondestructive tool developed for terrestrial sediment interstitial water extraction, has been proposed for efficient and nondestructive sampling of ocean sediment pore waters. However, there exists little documentation on the reliability and performance of Rhizon samplers in deep ocean sediments, particularly in regard to their effect on chloride concentration and oxygen and hydrogen isotopic measurements. We perform an intercomparison of chloride concentration and oxygen and hydrogen isotopic composition in samples taken using traditional squeezing versus those taken with Rhizon samplers. We find that samples taken with Rhizons have positive biases in both chloride concentration and stable isotopic ratios relative to those taken by squeezing water from sediments in a hydraulic press. The measured offsets between Rhizon and squeeze samples are consistent with a combination of absorption by and diffusive fractionation through the hydrophilic membrane of the Rhizon sampler. These results suggest caution is needed when using Rhizons for sampling interstitial waters in any research of processes that leave a small signal-to-noise ratio in dissolved concentrations or isotope ratios.

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Comparison of Rhizon Sampling and Whole Round Squeezing for Marine Sediment Porewater

Cited by 7 publications

References 21 publications

Active mud volcanoes on the continental slope of the Canadian Beaufort Sea

Active mud volcanoes on the continental slope of the Canadian Beaufort Sea

Methods

Rhizon sampler alteration of deep ocean sediment interstitial water samples, as indicated by chloride concentration and oxygen and hydrogen isotopes

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