Boron isotopic composition and concentration in modern marine carbonates

Hemming, N. Gary; Hanson, Gilbert N.

doi:10.1016/0016-7037(92)90151-8

Cited by 603 publications

(451 citation statements)

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“…Dissolved boron in seawater occurs primarily as boric acid, B(OH) 3 , and borate, B(OH) 4 À , and speciation is controlled by ambient pH 6 . Borate is selectively incorporated into aragonite 7 , presumably substituting for CO 3 2 À in the lattice.…”

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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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Corals concentrate dissolved inorganic carbon to facilitate calcification

et al. 2014

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“…The in£uence of symbiont photosynthesis on the boron isotopic composition of foraminifera shells shells (Hemming and Hanson, 1992;Sanyal et 33 al., 2001Sanyal et 33 al., , 1996Sanyal et 33 al., , 2000Spivack et al, 1993). Pearson and Palmer, 2000;Sanyal and Bijma, 40 1999;Sanyal et al, 1997Sanyal et al, , 1995Spivack et al, 41 1993).…”

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The influence of symbiont photosynthesis on the boron isotopic composition of foraminifera shells

Hönisch

Biȷma

Russell

et al. 2003

Marine Micropaleontology

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11 12Culture experiments were carried out with the planktonic foraminifer Orbulina universa under high and low light 13 levels in order to determine the influence of symbiont photosynthetic activity on the boron isotopic composition of 14 shell calcite. Under low light (reduced photosynthetic rates) the boron isotopic composition of the tests is 1.5x lower 15 compared to shells grown under high light (elevated photosynthetic rates). In terms of inferred pH, the lower boron 16 isotope values correspond to a reduction in pH of approximately 0.2 units. The boron isotopic composition of 17 Orbulina universa from plankton tows is similar to that of shells grown under low light conditions in the laboratory. 18 These data are consistent with reduced symbiont concentrations in recently secreted shells. In addition to laboratory 19 and field grown O. universa, we present the first data for a symbiont-barren foraminifer, Globigerina bulloides. Data 20 obtained for G. bulloides fall V1.4x below those of the field grown O. universa. Although the plankton tow results 21 are preliminary, they support the hypothesis that respiration and photosynthesis are the key physiological parameters 22 responsible for species-specific vital effects. , 1996Spivack et al., 1993).

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“…The two naturally occurring and stable isotopes are 11 B (80.1 %) and 10 B (19.9 %). The mass difference results in a wide range of boron isotopic compositions in terrestrial environments, and boron isotopic compositions in marine carbonates have been used as a paleo-pH proxy of the oceans (Hemming and Hanson 1992).…”

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Rouan¹

2015

Encyclopedia of Astrobiology

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Boron isotopic composition and concentration in modern marine carbonates

Cited by 603 publications

References 9 publications

Corals concentrate dissolved inorganic carbon to facilitate calcification

Corals concentrate dissolved inorganic carbon to facilitate calcification

The influence of symbiont photosynthesis on the boron isotopic composition of foraminifera shells

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