Sedimentary Geochemistry of the Carbonate and Sulphide Systems and their Potential Influence on Toxic Metal Bioavailability

Morse, John W.

doi:10.1007/978-3-662-04935-8_7

Cited by 7 publications

(4 citation statements)

References 45 publications

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“…The alkalinity increases until about 300 mbsf, the same depth at which the SO 4 2À decrease halts. This suggests some link between the two, such as microbial sulfate reduction (Mitterer et al, 2001;Morse, 2002). There is not an abundant amount of organic carbon present (<0.4% in the upper 200 meters), though Mitterer et al (2001) previously showed that microbial sulfate reduction occurs in carbonate-dominated sediments containing less than 1% organic carbon.…”

Section: Calculated Ph and Co 3 2à Profilesmentioning

confidence: 94%

Sr isotopes and pore fluid chemistry in carbonate sediment of the Ontong Java Plateau: Calcite recrystallization rates and evidence for a rapid rise in seawater Mg over the last 10 million years

Fantle

DePaolo

2006

Geochimica et Cosmochimica Acta

158

229

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Section: Calculated Ph and Co 3 2à Profilesmentioning

confidence: 94%

Sr isotopes and pore fluid chemistry in carbonate sediment of the Ontong Java Plateau: Calcite recrystallization rates and evidence for a rapid rise in seawater Mg over the last 10 million years

Fantle

DePaolo

2006

Geochimica et Cosmochimica Acta

158

229

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“…Morse (2002) discussed that the oxidation of FeS by hydrogen sulfide (Eqn. 5) is the faster process compared with the oxidation by elemental sulfur as discussed by Berner (1970).…”

Section: Diagenetic Alterationmentioning

confidence: 99%

Diagenetic Alteration of Magnetic Signals by Anaerobic Oxidation of Methane Related to a Change in Sedimentation Rate

Riedinger

Pfeifer

Kasten

et al. 2005

Geochimica et Cosmochimica Acta

168

167

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“…Calcium carbonate can form as aragonite, high-magnesium calcite, or low-magnesium calcite (Morse 2002) in order of importance in shallow marine systems. These calcium carbonate species have different solubilities, whereby higher Mg content increases solubility.…”

mentioning

confidence: 99%

Resilience of pore‐water chemistry and calcification in photosynthetic zones of calcifying sediments

Schoon

Bissett

Beer

2009

Limnology & Oceanography

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Photosynthetically driven calcification was investigated in diatom-dominated carbonate sediments from Bait Reef, Australia. Laboratory measurements conducted over complete diel cycles, using O 2 , pH, CO 2{ 3 , and Ca 2+ microsensors, confirmed that photosynthesis and respiration drive calcification and calcium release via their respective effects on the local pH. However, the dark situation does not simply mirror the light situation. Profiles showed that calcification and calcium release are not necessarily tightly coupled to the light cycle and that mass transfer phenomena need to be considered in diel chemical dynamics. The magnitude and timing of pH and CO 2{ 3 concentration changes did not simply follow the light cycle. The pH in the upper 3 mm of the sediment changed more rapidly upon illumination than upon darkening. Consequently, photosynthetically induced calcification began shortly (within 1 h) after illumination, but the pH remained elevated and calcification continued for ,7 h after darkening. Thus, calcification in marine phototrophic sediments is not limited to light periods, but may continue for extended periods after darkening. This decoupling of light, photosynthesis, and calcification has profound consequences for estimates of daily calcification rates, which have previously been made from measurements assuming close to steady states and 12 : 12 h light : dark calcification and decalcification. In Bait Reef sediments, such an assumption underestimates daily calcification rates by two-to threefold.

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Sedimentary Geochemistry of the Carbonate and Sulphide Systems and their Potential Influence on Toxic Metal Bioavailability

Cited by 7 publications

References 45 publications

Sr isotopes and pore fluid chemistry in carbonate sediment of the Ontong Java Plateau: Calcite recrystallization rates and evidence for a rapid rise in seawater Mg over the last 10 million years

Sr isotopes and pore fluid chemistry in carbonate sediment of the Ontong Java Plateau: Calcite recrystallization rates and evidence for a rapid rise in seawater Mg over the last 10 million years

Diagenetic Alteration of Magnetic Signals by Anaerobic Oxidation of Methane Related to a Change in Sedimentation Rate

Resilience of pore‐water chemistry and calcification in photosynthetic zones of calcifying sediments

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