Kinetic fractionation of carbon-13 during calcium carbonate precipitation

Turner, Jeffrey V.

doi:10.1016/0016-7037(82)90004-7

Cited by 265 publications

(136 citation statements)

References 19 publications

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“…This calculated value is 3.6‰ heavier than the mean δ 13 C value for the Bossons glacier SPCCs measured in this study. However, rapid calcite precipitation can exert an additional kinetic enrichment of up to −4‰ (Turner, 1982) and we cannot exclude here the involvement of a microbial community in the organic matter oxidation process. We propose that the C incorporated in the SPCCs was largely derived from old soil organic carbon that was converted into dissolved inorganic carbon through a combination of biotic and abiotic oxidation processes, with minor contributions from other sources.…”

Section: Carbon and Oxygen Isotopic Signalsmentioning

confidence: 93%

Geochemical Processes Leading to the Precipitation of Subglacial Carbonate Crusts at Bossons Glacier, Mont Blanc Massif (French Alps)

et al. 2017

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Cold climate carbonates can be used as paleoclimatic proxies. The mineralogy and isotopic composition of subglacially precipitated carbonate crusts (SPCCs) provide insights into the subglacial conditions and processes occurring at the meltwaterbasement rock interface of glaciers. This study documents such crusts discovered on the lee side of a gneissic roche moutonnée at the terminus of the Bossons glacier in the Mont Blanc Massif area (France). The geological context and mineralogical investigations suggest that the Ca used for the precipitation of large crystals of radial fibrous sparite observed in these crusts originated from subglacial chemical weathering of Ca-bearing minerals of the local bedrock (plagioclase and amphibole). Measurements of the carbon and oxygen isotope compositions in the crusts indicate precipitation at, or near to, equilibrium with the basal meltwater under open system conditions during refreezing processes. The homogeneous and low carbonate δ 13 C values (ca. −11.3‰) imply a large contribution of soil organic carbon to the Bossons subglacial meltwater carbon reservoir at the time of deposition. In addition, organic remains trapped within the SPCCs give an age of deposition around 6,500 years cal BP suggesting that the Mid-Holocene climatic and pedological optima are archived in the Bossons glacier carbonate crusts.

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Section: Carbon and Oxygen Isotopic Signalsmentioning

confidence: 93%

Geochemical Processes Leading to the Precipitation of Subglacial Carbonate Crusts at Bossons Glacier, Mont Blanc Massif (French Alps)

et al. 2017

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“…In this study we compare the 8 13 C of bryozoan calcite with values calculated using the calcite-HCO3" enrichment factor (e c _b) of Romanek et al (1992) which is apparently independent of temperature-related effects and precipitation rate dependent fractionation effects (cf. Emrich et al 1970;Turner 1982 (Grossman 1984;cf. Romanek et al 1992;Zhang et al 1995).…”

Section: Equilibrium Isotope Fractionationmentioning

confidence: 99%

Stable isotope composition of modern bryozoan skeletal carbonate from the Otago Shelf, New Zealand

Crowley¹,

Taylor²

2000

New Zealand Journal of Marine and Freshwater Research

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The oxygen (δ 18 O) and carbon (δ 13 C) isotope ratios of 10 species of living Bryozoa collected from the Otago Shelf, New Zealand were analysed to assess the extent to which isotopic equilibrium (relative to inorganic equilibrium isotope fractionation) is attained during the precipitation of skeletal calcium carbonate. The data reveal that whereas eight species of Bryozoa synthesise skeletal carbonate in apparent oxygen isotope equilibrium with respect to environmental conditions, two species (Celleporina grandis and Hippomonavella flexuosa) yield δ l8 O calcite values which indicate significant disequilibrium oxygen isotope fractionation during calcification. Sufficient data are available from one species (C. grandis) to demonstrate that disequilibrium is probably related to kinetic factors associated with diffusion-controlled transport of HCO 3 -to the site of calcite precipitation. Carbon isotope signatures indicate significant departures from inorganic isotope equilibrium in all but one bryozoan species (Hippomenella vellicata). Although greater uncertainties are associated with estimates of the isotopic composition of total dissolved Received 18 May 1999; accepted 20 December 1999 inorganic carbon (δ 13 C ΣDIC ), the data suggest that two factors-kinetic fractionation and incorporation of respiratory CO 2 -are important in controlling carbon isotope disequilibrium. Where bryozoan species exhibit evidence for disequilibrium in both oxygen and carbon isotope systems (C. grandis, H. flexuosa), it is likely that kinetic factors are primarily responsible for observed departures from carbon isotope equilibrium. In contrast, the probable explanation for those species which display evidence for carbon isotope disequilibrium only, is that skeletal carbonate is precipitated from a DIC pool modified by the incorporation of respiratory CO 2 . Differences between the carbon isotope composition of skeletal elements from the same species and co-existing species living in the same community suggests that significant variations may occur in the extent to which marine DIC and respiratory CO 2 are utilised during calcification. Additional studies of carbon pathways associated with calcification are required to assess the relative effects of kinetic, metabolic, and environmental factors on the carbon isotopic composition of bryozoan skeletal carbonate. M99028

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“…Higher isotope values are in part explained by the fact that calcite and aragonite have different equilibrium isotopic fractionations with respect to seawater. Consequently, aragonite is enriched by approximately 1 % in Table 5 Mean d (Emrich et al 1970;Turner 1982;Gonzalez and Lohmann 1985). The d 13 C ratios of shallowwater sediments deposited on the modern GBB, which are essentially 100% aragonite ), lie between ?4 and ?5% (Lowenstam and Epstein 1957;Shinn et al 1989;Swart and Eberli 2005), whereas the d 13 C values of modern low-magnesium calcite coccoliths range between 0 and ?1% (Milliman 1974).…”

Section: Carbon Isotope Ratiosmentioning

confidence: 99%

Whiting-related sediment export along the Middle Miocene carbonate ramp of Great Bahama Bank

Turpin

Emmanuel²,

Reijmer³

et al. 2011

Int J Earth Sci (Geol Rundsch)

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Modern aragonite needles are present all along the modern leeward margin of Great Bahama Bank (ODP Leg 166), while Middle Miocene sediments contain needles only in more distal areas (Sites 1006 and 1007). In contrast to the rimmed, flat-topped platform topography during the Plio-Pleistocene, the Miocene Great Bahama Bank morphology is a carbonate ramp profile. This might imply a different location and precipitation type for Miocene aragonite needles. In this study, aragonite needles in Miocene sediments were isolated using a granulometric separation method. Furthermore, the isolation of the various carbonate components enables the identification of primary versus diagenetic components. The Miocene aragonite needles are concentrated in the finest granulometric sediment fractions (\12 lm). The fraction-specific geochemical analyses (d 13 C, d 18 O and Sr elemental abundance) represent useful tools to assess the possible sources of the aragonite mud. The geochemical variation of the fractions, rich in pristine aragonite needles, and the characteristics of the needle morphology point to whiting phenomena as the main sediment source and algal fragmentation as a minor component. Both components indicate shallow-water environments as the main sediment source area. Ramp-top-related fine-grained particles now present at distal sites were likely exported as suspended material similar to present-day transport mechanisms. The scarcity of needles at proximal sites is probably linked to hydrodynamic processes but dissolution and recrystallization processes cannot be excluded. The granulometric separation approach applied here enables a better characterization of the finest carbonate particles representing an important step towards the discrimination between primary and diagenetic fine-grained components.

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Kinetic fractionation of carbon-13 during calcium carbonate precipitation

Cited by 265 publications

References 19 publications

Geochemical Processes Leading to the Precipitation of Subglacial Carbonate Crusts at Bossons Glacier, Mont Blanc Massif (French Alps)

Geochemical Processes Leading to the Precipitation of Subglacial Carbonate Crusts at Bossons Glacier, Mont Blanc Massif (French Alps)

Stable isotope composition of modern bryozoan skeletal carbonate from the Otago Shelf, New Zealand

Whiting-related sediment export along the Middle Miocene carbonate ramp of Great Bahama Bank

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