REE Incorporation into Calcite Individual Crystals as One Time Spike Addition

Gabitov, R. I.; Sadekov, Aleksey; Migdisov, Artas

doi:10.3390/min7110204

Cited by 12 publications

(12 citation statements)

References 37 publications

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“…Trace element profiles, including selected light REEs plus yttrium (hereafter REY), were measured using an Analyte G2 excimer laser (Teledyne Photon Machines Inc, Omaha, NE, USA) coupled with Thermo i‐CapQ ICP‐MS at the University of Cambridge, following the methods later outlined in Gabitov et al () and Skinner et al (). Only selected REYs were measured because of counting statistics at the time of analysis.…”

Section: Methodsmentioning

confidence: 99%

Chemical Composition of Carbonate Hardground Cements as Reconstructive Tools for Phanerozoic Pore Fluids

Erhardt

Turchyn

Dickson

et al. 2020

Geochem Geophys Geosyst

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In this study, we report the chemical composition of early carbonate cement precipitates in carbonate hardgrounds to understand the geochemical signature of near‐surface carbonate mineral precipitation. As carbonate hardgrounds lithify at or near the sediment‐water interface, they acquire cements that may be minimally evolved from paleoseawater. Using a suite of chemical measurements, we explore the potential of carbonate hardground cements as paleoenvironmental proxies. Trace metal and isotopic ratios, including some rare earth elements, Mg/Ca, manganese, and strontium concentrations, δ18O, δ13C, and 87Sr/86Sr, were analyzed in the carbonate cements from 17 Phanerozoic carbonate hardgrounds. The sensitivity of the geochemical signal to alteration depends on the geochemical analysis in question and the environmental water‐rock ratio. Of these samples, only our modern sample has measurements consistent with primary precipitation from seawater; all other samples precipitated from chemically evolved seawater or were influenced by meteoric water, even if only minimally changed. The more recent samples from the Cenozoic had seawater 87Sr/86Sr. The Mesozoic samples, in contrast, did not preserve seawater 87Sr/86Sr, even though the Mg/Ca, δ18O, and δ13C values were consistent with precipitation from seawater. Finally, the Paleozoic samples preserved expected seawater 87Sr/86Sr, though rare earth element and δ18O suggest primary precipitation was from evolved seawater. Additionally, we place our results in the context of open versus closed system precipitation using transects of the Mg/Ca ratios across individual cements. Overall, we stress that one geochemical measurement provides only a partial record of fluid composition, but multiple measurements allow a potential understanding of the seawater geochemical signal.

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Section: Methodsmentioning

confidence: 99%

Chemical Composition of Carbonate Hardground Cements as Reconstructive Tools for Phanerozoic Pore Fluids

Erhardt

Turchyn

Dickson

et al. 2020

Geochem Geophys Geosyst

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“…The maximum in La/Ca corresponds to the time when La was added into solution and captured by calcite growing layer followed by the rapid decrease of La/Ca toward calcite surface (zero distance). This rapid decrease in La/Ca is due to the strong affinity of La in coprecipitating with calcite (Terakado and Masuda, 1988;Zhong and Mucci, 1995;Toyama and Terakado, 2014;Voigt et al, 2017;Gabitov et al, 2017). The plots of Sr/Ca vs. Mg/Ca show three data groups collected in the calcite overgrowth, calcite substrate, and mixing zone (probably formed due to micro-asperities on the boundary between substrate and overgrowth) ( Figure 3A).…”

Section: Icp-ms Data Of Experimental Fluids and La-icp-ms Data Of Calmentioning

confidence: 98%

Elemental Uptake by Calcite Slowly Grown From Seawater Solution: An in-situ Study via Depth Profiling

et al. 2019

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Crystal growth rate has not been sufficiently explored to understand element partitioning between calcite and seawater solutions. We investigated the uptake of Li, B, Mg, Sr, and Ba by Mg-bearing calcite slowly grown on a calcite cleavage fragment. Experiments were conducted by elevating the alkalinity of an artificial seawater solution. Growth rates were evaluated by addition of lanthanum spike. At the end of each experiment, cleavage fragments were extracted and examined with micro-Raman spectroscopy, scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) using depth profiling technique. Distribution of Li, B, Mg, Sr, and Ba in calcite overgrowth as well as partition coefficients of those elements were evaluated.

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“…Due to the overgrowth of crystals, the heterogeneous distribution of impurities has been discovered in natural single crystals of low-temperature precipitated calcite 7,111 . In laboratory-synthesized calcite, the distribution of trace elements is not reported very often, even though heterogeneous distribution sometimes occurrs 66,112 . However, the HM-calcites in our experiment showed both heterogeneous (Cd, Zn, U) and homogeneous (Co, Ni, U) distributions.…”

Section: Discussionmentioning

confidence: 99%

Divalent heavy metals and uranyl cations incorporated in calcite change its dissolution process

Zhang

Guo

et al. 2020

Sci Rep

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Due to the high capacity of impurities in its structure, calcite is regarded as one of the most attractive minerals to trap heavy metals (HMs) and radionuclides via substitution during coprecipitation/crystal growth. As a high-reactivity mineral, calcite may release HMs via dissolution. However, the influence of the incorporated HMs and radionuclides in calcite on its dissolution is unclear. Herein, we reported the dissolution behavior of the synthesized calcite incorporated with cadmium (Cd), cobalt (Co), nickel (Ni), zinc (Zn), and uranium (U). Our findings indicated that the HMs and U in calcite could significantly change the dissolution process of calcite. The results demonstrated that the incorporated HMs and U had both inhibiting and enhancing effects on the solubility of calcite, depending on the type of metals and their content. Furthermore, secondary minerals such as smithsonite (ZnCO3), Co-poor aragonite, and U-rich calcite precipitated during dissolution. Thus, the incorporation of metals into calcite can control the behavior of HMs/uranium, calcite, and even carbon dioxide.

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REE Incorporation into Calcite Individual Crystals as One Time Spike Addition

Cited by 12 publications

References 37 publications

Chemical Composition of Carbonate Hardground Cements as Reconstructive Tools for Phanerozoic Pore Fluids

Chemical Composition of Carbonate Hardground Cements as Reconstructive Tools for Phanerozoic Pore Fluids

Elemental Uptake by Calcite Slowly Grown From Seawater Solution: An in-situ Study via Depth Profiling

Divalent heavy metals and uranyl cations incorporated in calcite change its dissolution process

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