Leg 164 Introduction

Paull, C.K.; Matusmoto, R.; Wallace, P.J.

doi:10.2973/odp.proc.ir.164.101.1996

Cited by 2 publications

(5 citation statements)

References 52 publications

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“…Despite a slight increase in calcium content at about 500 mbsf in the study site, the model shows a good match with the reference site's data. An additional source of calcium in the sediment and change in abundance of authigenic carbonate [51] could explain the difference between the model and data.…”

Section: Solid Phase and Pore Water Concentrationmentioning

confidence: 77%

“…After around three million years, when about 350 m of sediment accumulated, methane in pores below about 180 mbsf becomes supersaturated and gas hydrate forms. This depth is the upper edge of the zone with dispersed gas hydrate in sediments is described in the ODP report for site 997 [51]. As more methane is produced with time, more gas hydrate is formed.…”

Section: Methane Phase Behaviormentioning

confidence: 95%

“…The model was solved using MATLAB (R2020a, MathWorks). All modeling and calculations were done based on the data gathered from OPD site 997, Leg 164 [22,49,51].…”

Section: Numerical Modelingmentioning

confidence: 99%

“…According to the decrease in POC input (98.5-100 Myr) based on the reference data for site 997, methanogenesis and sulfate reduction slightly decrease, and SMT depth increases to its present day (24 mbsf). According to the ODP report for the studied site [51], Blake Ridge contains gas hydrate, and below the GHSZ, there is an accumulation of free gas [16,57], which is produced via microbial methanogenesis [22]. According to the salinity profile, we considered up to 8% of pore volume could be occupied by gas hydrate and free gas.…”

Section: Methane Phase Behaviormentioning

confidence: 99%

“…As demonstrated in the time-lapse video (Video S1), the gas hydrate produced by in situ organic matter degradation is less than 1% of the pore volume. With the continuation of deposition, gas hydrate is buried down as sedimentation proceeds and starts to dissociate when it crosses the base of the GHSZ depth, and after saturating pore According to the ODP report for the studied site [51], Blake Ridge contains gas hydrate, and below the GHSZ, there is an accumulation of free gas [16,57], which is produced via microbial methanogenesis [22]. According to the salinity profile, we considered up to 8% of pore volume could be occupied by gas hydrate and free gas.…”

Section: Methane Phase Behaviormentioning

confidence: 99%

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A New Dynamic Modeling Approach to Predict Microbial Methane Generation and Consumption in Marine Sediments

2021

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Methane, as a clean energy source and a potent greenhouse gas, is produced in marine sediments by microbes via complex biogeochemical processes associated with the mineralization of organic matter. Quantitative modeling of biogeochemical processes is a crucial way to advance the understanding of the global carbon cycle and the past, present, and future of climate change. Here, we present a new approach of dynamic transport-reaction model combined with sediment deposition. Compared to other studies, since the model does not need the methane concentration in the bottom of sediments and predicts that value, it provides us with a robust carbon budget estimation tool in the sediment. We applied the model to the Blake Ridge region (Ocean Drilling Program, Leg 164, site 997). Based on seafloor data as input, our model remarkably reproduces measured values of total organic carbon, dissolved inorganic carbon, sulfate, calcium, and magnesium concentration in pore waters and the in situ methane presented in three phases: dissolved in pore water, trapped in gas hydrate, and as free gas. Kinetically, we examined the coexistence of free gas and hydrate, and demonstrated how it might affect methane gas migration in marine sediment within the gas hydrate stability zone.

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Section: Solid Phase and Pore Water Concentrationmentioning

confidence: 77%

Section: Methane Phase Behaviormentioning

confidence: 95%

“…The model was solved using MATLAB (R2020a, MathWorks). All modeling and calculations were done based on the data gathered from OPD site 997, Leg 164 [22,49,51].…”

Section: Numerical Modelingmentioning

confidence: 99%