Diagenetic Mg-rich calcite in Mediterranean sediments: Quantification and impact on foraminiferal Mg/Ca thermometry

Boussetta, Soumaya; Bassinot, Franck; Sabbatini, Anna; Caillon, Nicolas; Nouet, Julius; Kallel, Néjib; Rebaubier, H.; Klinkhammer, Gary P.; Labeyrie, Laurent D

doi:10.1016/j.margeo.2010.12.011

Cited by 33 publications

(61 citation statements)

References 61 publications

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“…The use of (Mg/Ca) calcite ratios as a palaeothermometer has since become widespread in marine settings with many studies on benthic and planktonic foraminifera (Delaney et al, 1985;Nurnberg et al, 1996;Rosenthal et al, 1997;Anand et al, 2003;Elderfield et al, 2006;Kısakü rek et al, 2008;Boussetta et al, 2011;Martínez-Botí et al, 2011) and to a lesser extent in corals (Mitsuguchi et al, 1996;Wei et al, 2000;Shirai et al, 2005;Yu et al, 2006;Reynaud et al, 2007). Surface freshwater carbonates ("tufa") are ambient temperature freshwater deposits which have been considered, but not thoroughly investigated, as potential archives of terrestrial palaeotemperature data through their Mg/Ca ratios (Garnett et al, 2004;Rogerson et al, 2008;Lojen et al, 2009;Brasier et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Mg/Ca ratios in freshwater microbial carbonates: Thermodynamic, kinetic and vital effects

Saunders

Rogerson

Wadhawan

et al. 2014

Geochimica et Cosmochimica Acta

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The ratio of magnesium to calcium (Mg/Ca) in carbonate minerals in an abiotic setting is conventionally assumed to be predominantly controlled by (Mg/Ca) solution and a temperature dependant partition coefficient. This temperature dependence suggests that both marine (e.g. foraminiferal calcite and corals) and freshwater (e.g. speleothems and surface freshwater deposits, "tufas") carbonate deposits may be important archives of palaeotemperature data. However, there is considerable uncertainty in all these settings. In surface freshwater deposits this uncertainty is focussed on the influence of microbial biofilms. Biogenic or "vital" effects may arise from microbial metabolic activity and/or the presence of extracellular polymeric substances (EPS). This study addresses this key question for the first time, via a series of unique through-flow microcosm and agitated flask experiments where freshwater calcite was precipitated under controlled conditions. These experiments reveal there is no strong relationship between (Mg/Ca) calcite and temperature, so the assumption of thermodynamic fractionation is not viable. However, there is a pronounced influence on (Mg/Ca) calcite from precipitation rate, so that rapidly forming precipitates develop with very low magnesium content indicating kinetic control on fractionation. Calcite precipitation rate in these experiments (where the solution is only moderately supersaturated) is controlled by biofilm growth rate, but occurs even when light is excluded indicating that photosynthetic influences are not critical. Our results thus suggest the apparent kinetic fractionation arises from the electrochemical activity of EPS molecules, and are therefore likely to occur wherever these molecules occur, including stromatolites, soil and lake carbonates and (via colloidal EPS) speleothems.

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Section: Introductionmentioning

confidence: 99%

Mg/Ca ratios in freshwater microbial carbonates: Thermodynamic, kinetic and vital effects

Saunders

Rogerson

Wadhawan

et al. 2014

Geochimica et Cosmochimica Acta

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“…(For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) advection from warmer waters (Boussetta et al, 2011;Elderfield and Ganssen, 2000;Friedrich et al, 2012;Hathorne et al, 2009;Martínez-Botí et al, 2011). While, N. pachyderma (s) and G. bulloides are often used in paleoceanographic studies in the northern North Atlantic, a systematic study of their seasonal Mg/Ca patterns in the region has been lacking.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Mg/Ca variability of N. pachyderma (s) and G. bulloides: Implications for seawater temperature reconstruction

Jonkers

Jimenez-Amat

Mortyn

et al. 2013

Earth and Planetary Science Letters

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“…Boussetta et al, 2011) may pose potential challenges in data interpretation. However, the application of methods such as flow-through time-resolved analysis(Hoogakker et al, 2009) and laser-ablation inductively-coupled plasma mass spectrometry(Fhlaithearta et al, 2010) can be used to separate out signatures of primary versus secondary phases in such successions.…”

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confidence: 99%

Probing connections between deep earth and surface processes in a land-locked ocean basin transformed into a giant saline basin: The Mediterranean GOLD project#

Rabineau

Cloetingh

Kuroda

et al. 2015

Marine and Petroleum Geology

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Diagenetic Mg-rich calcite in Mediterranean sediments: Quantification and impact on foraminiferal Mg/Ca thermometry

Cited by 33 publications

References 61 publications

Mg/Ca ratios in freshwater microbial carbonates: Thermodynamic, kinetic and vital effects

Mg/Ca ratios in freshwater microbial carbonates: Thermodynamic, kinetic and vital effects

Seasonal Mg/Ca variability of N. pachyderma (s) and G. bulloides: Implications for seawater temperature reconstruction

Probing connections between deep earth and surface processes in a land-locked ocean basin transformed into a giant saline basin: The Mediterranean GOLD project#

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