Diagenesis in live corals from the Gulf of Aqaba. I. The effect on paleo-oceanography tracers

Enmar, Rivka; Stein, Mordechai; Bar‐Matthews, Miryam; Sass, Eytan; Katz, Amitai; Lazar, Boáz

doi:10.1016/s0016-7037(00)00417-8

Cited by 121 publications

(150 citation statements)

References 23 publications

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“…This may be related to a subtle submarine diagenesis, which would include here dissolution of old carbonates and secondary Mg-calcite precipitation. Due to organic matter degradation, coral pore waters have a lower pH than that of open reef waters (Enmar et al 2000) that may favor dissolution of carbonates. Secondary precipitation of aragonite and/or Mg-calcite micrites or needles of some 10 µm often fill voids in skeleton pores of sub-marine fossil corals (Enmar et al 2000) (Figure 3).…”

Section: Comparison Of the Marine Reservoir R Ages From The Tahiti Anmentioning

confidence: 99%

“…Due to organic matter degradation, coral pore waters have a lower pH than that of open reef waters (Enmar et al 2000) that may favor dissolution of carbonates. Secondary precipitation of aragonite and/or Mg-calcite micrites or needles of some 10 µm often fill voids in skeleton pores of sub-marine fossil corals (Enmar et al 2000) (Figure 3). A 10% result in weight of secondary crystallization deriving from old 14 C-depleted carbonates would account for the anomalously old 14 C ages at 15,100 cal yr and 5% at 12,000 cal yr.…”

Section: Comparison Of the Marine Reservoir R Ages From The Tahiti Anmentioning

confidence: 99%

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Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

et al. 2004

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ABSTRACT. Paired radiocarbon and 230 Th/U dating was performed on 13 surface corals from submerged reefs in the Marquesas and from raised terraces in Vanuatu. The absolute ages of the corals analyzed ranged from 3000 to 15,000 cal yr. Estimates of the difference between the absolute and 14 C ages of these corals are in agreement with previous determinations up until 11,500 cal yr. The resulting mean sea surface reservoir age R is determined at 390 ± 60 yr for the Marquesas region (9°S), which is slightly higher than the R value at 280 ± 50 yr for the Tahiti Islands (18°S). Multiple 14 C analyses of 2 corals from the Marquesas present scattered 14 C ages at ~12,000 and ~15,100 cal yr. This could be attributed to rapid changes of the 14 C content of surface waters around the Marquesas Islands or to a subtle submarine diagenesis.

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Section: Comparison Of the Marine Reservoir R Ages From The Tahiti Anmentioning

confidence: 99%

Section: Comparison Of the Marine Reservoir R Ages From The Tahiti Anmentioning

confidence: 99%

Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

et al. 2004

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“…Secondary inorganic aragonite has a significantly higher Sr/Ca ratio than primary coral aragonite (Enmar et al 2000). Marine aragonite may be common in corals that are only decades old.…”

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confidence: 98%

Early marine diagenesis in corals and geochemical consequences for paleoceanographic reconstructions

Müller

Gagan

McCulloch

2001

Geophysical Research Letters

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“…We consider three scenarios: that B(OH) 4 À co-precipitates with CO 3 2 À only (scenario 1), with HCO 3 À only (scenario 2) or with both CO 3 2 À and HCO 3 À (scenario 3). We estimated the B(OH) 4 À /CO 3 2 À , B(OH) 4 À /HCO 3 À and B(OH) 4 À /(CO 3 2 À þ HCO 3 À ) aragonite partition coefficients from an estimate of the d 11 B and B/Ca of secondary aragonite cement in a fossil coral coupled with alkalinity measurements of coral skeletal pore fluids 18 . We used our estimates of ECF pH and co-precipitating DIC species to calculate the concentrations of the other carbonate system variables in the ECF, namely, all other DIC species and total alkalinity (TA).…”

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confidence: 99%

Corals concentrate dissolved inorganic carbon to facilitate calcification

et al. 2014

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The sources of dissolved inorganic carbon (DIC) used to produce scleractinian coral skeletons are not understood. Yet this knowledge is essential for understanding coral biomineralization and assessing the potential impacts of ocean acidification on coral reefs. Here we use skeletal boron geochemistry to reconstruct the DIC chemistry of the fluid used for coral calcification. We show that corals concentrate DIC at the calcification site substantially above seawater values and that bicarbonate contributes a significant amount of the DIC pool used to build the skeleton. Corals actively increase the pH of the calcification fluid, decreasing the proportion of DIC present as CO 2 and creating a diffusion gradient favouring the transport of molecular CO 2 from the overlying coral tissue into the calcification site. Coupling the increases in calcification fluid pH and [DIC] yields high calcification fluid [CO 3 2 À ] and induces high aragonite saturation states, favourable to the precipitation of the skeleton.

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Diagenesis in live corals from the Gulf of Aqaba. I. The effect on paleo-oceanography tracers

Cited by 121 publications

References 23 publications

Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Early marine diagenesis in corals and geochemical consequences for paleoceanographic reconstructions

Corals concentrate dissolved inorganic carbon to facilitate calcification

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Diagenesis in live corals from the Gulf of Aqaba. I. The effect on paleo-oceanography tracers

Cited by 121 publications

References 23 publications

Paired 14C and 230Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Paired 14C and 230Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Early marine diagenesis in corals and geochemical consequences for paleoceanographic reconstructions

Corals concentrate dissolved inorganic carbon to facilitate calcification

Contact Info

Product

Resources

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Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval