Sr2+/Ca2+ and 44Ca/40Ca fractionation during inorganic calcite formation: I. Sr incorporation

Tang, Jianwu; Köhler, Stephan Jürgen; Dietzel, Martin

doi:10.1016/j.gca.2008.05.031

Cited by 187 publications

(168 citation statements)

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“…2). Sr value of 0.39 is higher than but close to the range described by published data (coloured bars; not plotted against x-axis) (Bourdin et al, 2011;Gascoyne, 1983;Tang et al, 2008;Tesoriero and Pankow, 1996). …”

Section: S3 Sensitivity Of Vertical Extension Rate To δsupporting

confidence: 78%

“…We extended the R 0 reconstruction beyond the sampling date of Gib04a, through the cave monitoring period, and derived K d Sr variability from these hypothetical vertical growth rate values using the relationship of (Fig. S3), which is higher than but close to experimentally-determined values Tang et al, 2008;Tesoriero and Pankow, 1996) and natural speleothem calcite values deposited at cave temperatures comparable to those of NSM Cave (Bourdin et al, 2011;Gascoyne, 1983). This overestimation is expected, given the higher vertical extension rate of Gib04a relative to the rates considered in those studies.…”

Section: S2 Sr Partitioning and Additional Validation Of Gib04a Growmentioning

confidence: 99%

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Reconstructing modern stalagmite growth from cave monitoring, local meteorology, and experimental measurements of dripwater films

Baker

Mattey

Baldini

2014

Earth and Planetary Science Letters

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. (2014) 'Reconstructing modern stalagmite growth from cave monitoring, local meteorology, and experimental measurements of dripwater lms.', Earth and planetary science letters., 392 . pp. 239-249. Further information on publisher's website:http://dx.doi.org/10.1016/j.epsl.2014.02.036Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Earth and Planetary Science Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Earth and Planetary Science Letters, 392, 15 April 2014, 10.1016/j.epsl.2014 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractInterpretations of high-resolution proxy datasets from stalagmites require support from longterm cave monitoring data and quantified changes in sample growth rate. One cave site for which the modern climate signal transfer systematics are relatively well characterised by cave monitoring is New St Michael's Cave, Gibraltar. This site provides a rare opportunity to reconstruct modern calcite growth, to link growth with the cave environment and local climate, and to test the sufficiency of existing growth rate theory on monthly to inter-annual timescales. Here, we use a numerical time-series growth rate model, driven by cave monitoring and local meteorological data, and the results of an experimental investigation into variation in dripwater film thickness as a function of stalagmite apex morphology to reconstruct the modern growth (AD 1951(AD -2004 of 'Gib04a', a stalagmite retrieved from New St Michael's Cave. Our experimental measurements demonstrate that dripwater film thickness decreases linearly with increasing stalagmite curvature and that the presence of millimetre-scale surface microtopography reduces film thickness by an order of magnitude. We identified changes in growth laminae curvature from a Gib04a cut section to determine film thickness variability through time and combined this with estimated dripwater [Ca 2+ ] and cave air pCO 2 seasonality to drive the model. Our reconstruction exhibits strong seasonality and tracks variability in calcite [Sr 2+ ], a trace metal whose incorporation into calcite is partially growth rate-controlled. Reconstructed growth also shows co-variation with seasonal changes in calc...

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Section: S3 Sensitivity Of Vertical Extension Rate To δsupporting

confidence: 78%

Section: S2 Sr Partitioning and Additional Validation Of Gib04a Growmentioning

confidence: 99%

Reconstructing modern stalagmite growth from cave monitoring, local meteorology, and experimental measurements of dripwater films

Baker

Mattey

Baldini

2014

Earth and Planetary Science Letters

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“…4B), an increase of 0.008 mmol/mol of Sr/Ca per salinity unit is observed. According to Lorens (1981), Nehrke et al (2007) and Tang et al (2008), higher calcite Sr/Ca ratios are mainly associated with higher growth rates in inorganic calcite which is also observed in biogenic calcite (Kısakürek et al, 2008). Results from inorganic experiments (Zuddas and Mucci, 1998) furthermore indicate a positive linear correlation between calcite precipitation rate and ionic strength of the solution.…”

Section: Effect Of Salinity On Mg/ca and Sr/ca Ratiosmentioning

confidence: 81%

“…We also observe that the regression model predicts a statistically significant Sr/Ca variability due to changes in Ω (p b 0.001; Table 3). In inorganic and biogenic calcite, the Sr/Ca ratio is known to increase with growth rate (Lorens, 1981;Nehrke et al, 2007;Tang et al, 2008;Kısakürek et al, 2008), and a higher [CO 3…”

Section: Effect Of Calcium Carbonate Saturation State (ω) On Mg/ca Anmentioning

confidence: 99%

Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera

Dueñas-Bohórquez

Rocha

Kuroyanagi

et al. 2009

Marine Micropaleontology

101

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“…Rates determined by Tang et al [2008a] are close to an order of magnitude more rapid those measured in this study. Some of this may be related to the experimental approach outlined in Tang et al [2008b] and used in Tang et al [2008a], which made use of pH-stat batch reactors without seeds to determine the rate. In their study, one can observe significant changes in precipitation rate by as much as a factor of 7 over time, as for example with their samples 20, 12, and 13, all measured at a saturation index of 1.11-1.12, but at times ranging from 9 to 14 to 59 min, respectively (Tang et al [2008a]).…”

Section: Interpretation Of Rates From Stirred Reactorsmentioning

confidence: 99%

Upscaling calcium carbonate precipitation rates from pore to continuum scale

et al. 2012

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The upscaling of calcite precipitation rates in porous media from the pore (micron) to continuum (centimeter) scale is evaluated with an integrated experimental and modeling approach. Experiments using cylindrical cores packed with glass beads and calcite (Iceland spar) crystals were injected over a period of 28 days with a supersaturated mixture of CaCl 2 and NaHCO 3 to induce calcite growth. Bulk rates of precipitation based on the change in aqueous chemistry over the length of the column are compared with spatially resolved determinations of carbonate precipitation using X-ray synchrotron microtomographic imaging at the micron scale. These data are supplemented by continuously-stirred reactor experiments using the same calcite seed material so as to minimize differences in the effects of reactive site density of the seed material, and to evaluate the rate of precipitation in the absence of transport or "porous medium" effects. Calcite precipitation rates determined in the stirred flowthrough reactor in this study are considerably slower than rates determined at similar supersaturation in unseeded batch experiments by Tang et al. [2008a], although these rates are compatible with those reported in Nehrke et al. [2007] for precipitation on Iceland spar when the same normalization to reactive surface area is used. The nearly linear dependence of the rates on supersaturation cannot be attributed to a diffusion control in the case of the stirred reactors and is likely the result of multi-sourced spiral growth.Integrated precipitation rates based on column effluent chemistry from a higher supersaturation experiment are in good agreement with determinations of total carbonate precipitated based on determination of pre-and post-experiment mass in the column using X-ray microtomography. Using the rates of precipitation determined in the well-stirred flowthrough reactors, it is possible to match the spatially-resolved microtomographic and aqueous data with a coarser resolution continuum model using volume-averaged flow and reactive surface area if the generation of new reactive surface area is accounted for. A nucleation or surface roughening event, which is most pronounced within two millimeters of the column inlet where the supersaturation is highest, is recorded by both BET analysis, which indicates an increase in specific surface area from 0.012 m 2 •g -1 to a value of 0.21 m 2 •g -1 for neoformed calcium carbonate, and by X-ray microtomography. The best fit of the column X-ray microtomography data is provided by simulating calcite precipitation either as a single nearly linear rate for multi-sourced spiral growth, or as two parallel rates that include the spiral growth model and a 2D heterogeneous nucleation model modified by a partial diffusion control, although nucleation needs to be relatively minor on a mass basis in order to match the data. The combined experiments and modeling indicate that it is possible to develop upscaled quantitative models for porous media reactivity, but changes in such propert...

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Sr2+/Ca2+ and 44Ca/40Ca fractionation during inorganic calcite formation: I. Sr incorporation

Cited by 187 publications

References 50 publications

Reconstructing modern stalagmite growth from cave monitoring, local meteorology, and experimental measurements of dripwater films

Reconstructing modern stalagmite growth from cave monitoring, local meteorology, and experimental measurements of dripwater films

Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera

Upscaling calcium carbonate precipitation rates from pore to continuum scale

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