Lithium‐to‐calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells

Delaney, Margaret Lois; Popp, Brian N.; Lepzelter, C. G.; Anderson, Thomas F.

doi:10.1029/pa004i006p00681

Cited by 48 publications

(38 citation statements)

References 21 publications

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“…The Sr/Ca values range from 0.5 to 2.5 mmol.mol -1 , with aragonite and high-magnesium calcite (HMC) samples from this study having higher Sr/Ca compared to LMC. The Mg/Ca and Sr/Ca values of our samples are in the range of previously published values for modern mollusks (Steuber, 1999), brachiopods (Brand et al, 2003;Delaney et al, 1989;Ullmann et al, 2017) and sea urchins (Carpenter and Lohmann, 1992;LaVigne et al, 2013 Li/Ca and Mg/Ca (Fig. 3) for all biogenic carbonates, suggesting that these two elements are impacted by one or more common processes during biomineralization.…”

Section: Major and Trace Element Ratiossupporting

confidence: 68%

“…Temperature appears to be a major control on the Li/Ca ratio of brachiopods, which show increasing Li/Ca with decreasing temperature (Delaney et al, 1989), similar to that observed for inorganic calcite. However, no systematic trend between Li/Ca and temperature has been observed for other biogenic carbonates.…”

Section: Introductionmentioning

confidence: 53%

“…Bivalves, brachiopods, and echinoderms are present in widely distributed habitats in the modern-day ocean, are often well-preserved during diagenesis, and are abundant in the Phanerozoic record (Immenhauser et al, 2016;Veizer et al, 1999;Wilkinson, 1979 (Delaney et al, 1989;Füllenbach et al, 2015;Thébault et al, 2009;Thébault and Chauvaud, 2013), but no Li isotope data on modern bivalves and brachiopods. Here we test the influence of temperature, mineralogy and biology on Li isotopic composition and Li/Ca ratio on a set of mollusk, brachiopod and echinoderm samples from various environments, in order to evaluate the suitability of these taxa to reconstructing past δ 7 Li seawater .…”

Section: Introductionmentioning

confidence: 99%

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The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms

Dellinger

West

Paris

et al. 2018

Geochimica et Cosmochimica Acta

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Little is known about the fractionation of Li isotopes during formation of biogenic carbonates, which form the most promising geological archives of past seawater composition.Here we investigated the Li isotope composition (δ 7 Li) and Li/Ca ratios of organisms that are abundant in the Phanerozoic record, mollusks (mostly bivalves), echinoderms, and brachiopods. The measured samples include (i) modern calcite and aragonite shells from variable species and natural environments (13 mollusk samples, 5 brachiopods and 3 echinoderms), and (ii) shells from organisms grown under controlled conditions at various temperatures. When possible, the mollusk shell ultrastructure was micro-sampled in order to assess intra-shell heterogeneity. In this paper, we systematically characterize the respective influence of mineralogy, temperature, and biological processes on the δ 7 Li and Li/Ca of these shells and compare with published data for other taxa (foraminifera and corals).Aragonitic mollusks have the lowest δ 7 Li, ranging from +16 to +22‰, echinoderms have constant δ 7 Li of about +24‰, brachiopods have δ 7 Li of +25 to +28‰, and finally calcitic mollusks have the largest range and highest δ 7 Li values, ranging from +25‰ to +40‰. Measured brachiopods have similar δ 7 Li compared to inorganic calcite precipitated from seawater (δ 7 Li of +27 to +29‰), indicating minimum influence of vital effects, as also observed for other isotope systems and making them a potentially viable proxy of past seawater composition. Calcitic mollusks, on the contrary, are not a good archive for seawater paleo-δ 7 Li because many samples have significantly higher δ 7 Li values than inorganic calcite and display large inter-species variability, which suggest large vital effects. In addition, we observe very large intra-shell variability, in particular for mixed calcitearagonite shells (over 20‰ variability), but also in mono-mineralic shells (up to 12‰ variability). Aragonitic bivalves have less variable δ 7 Li (7‰ variability) compared to calcitic mollusks, but with significantly lower δ 7 Li compared to inorganic aragonite, indicating the existence of vital effects. Bivalves grown at various temperatures show that temperature has only a minor influence on fractionation of Li isotopes during shell precipitation. Interestingly, we observe a strong correlation (R 2 =0.83) between the Li/Mg ratio in bivalve Mytilus edulis and temperature with potential implications for paleo-temperature reconstructions.Finally, we observe a negative correlation between the δ 7 Li and both the Li/Ca and Mg/Ca ratio of calcite mollusks, which we relate to biomineralization processes.

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Section: Major and Trace Element Ratiossupporting

confidence: 68%

Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms

Dellinger

West

Paris

et al. 2018

Geochimica et Cosmochimica Acta

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“…Many authors highlighted inverse relationships between calcification temperature and Li/Ca in coralline aragonite (Marriott et al, 2004a;Montagna et al, 2006), in foraminifera (Hall and Chan, 2004;Marriott et al, 2004b), in brachiopods (Delaney et al, 1989), as well as in inorganic calcite (Marriott et al, 2004a). Surprisingly, these results are in contradiction with thermodynamic calculations stating that Li content in calcium carbonate should increase with increasing temperature (Hall and Chan, 2004).…”

Section: Calcification Temperaturecontrasting

confidence: 55%

“…Most studies on Li/Ca ratio in biocarbonates dealt with foraminifera (Delaney et al, 1985;Delaney and Boyle, 1986;Hall and Chan, 2004;Marriott et al, 2004b;Hathorne and James, 2006;Lear and Rosenthal, 2006;Hendry et al, 2009;Lear et al, 2010), and to a lesser extent with corals (Marriott et al, 2004a;Montagna et al, 2006) and brachiopods (Delaney et al, 1989). The only known study on Li/Ca ratio in bivalve mollusc shells was conducted on juvenile Arctica islandica shells from northeast Iceland (Thébault et al, 2009b).…”

Section: Discussionmentioning

confidence: 99%

Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms

Thébault

Chauvaud

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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To cite this version:Julien Thébault, Laurent Chauvaud. Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms. Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2012, 373, pp.108-122. <10.1016/j.palaeo.2011 AbstractPhytoplankton dynamics in coastal oceans is a major component of the global biogeochemical carbon cycle, and is currently affected by global change through modifications in levels of primary productivity and composition of phytoplankton communities. Despite many attempts, no straightforward geochemical proxy has been found yet in marine biogenic carbonates for reconstruction of past phytoplankton dynamics with high temporal resolution. Here, we report on subweekly variations of lithium-to-calcium ratios (Li/Ca shell ) along the axis of maximum growth of great scallop shells ( Comparison of these results with shell growth measurements (increment width) and environmental parameters suggests (i) that shell calcification rate is likely the main factor controlling incorporation of Li in Pecten maximus shell calcite, (ii) that seawater temperature has only a weak positive influence on Li/Ca shell of this species over the range 8-18°C, and (iii) that during diatom blooms, additional amounts of Li may be trapped in the shell following dissolution of Li-rich frustules of edible species in the digestive tract of scallops, being responsible for Li/Ca shell peaks. Therefore, we suggest that Li/Ca shell ratio may be a novel proxy for timing and magnitude of diatom blooms in coastal ecosystems. Analysis of ancient shells may thus provide useful information on past phytoplankton dynamics and on the importance of recent shifts observed from diatoms to non-siliceous phytoplankton in coastal areas affected by anthropogenic activities.

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Strontium isotope stratigraphy of marine Oligocene–Miocene sedimentary successions of Kutch Basin, western India

Singh,

Vadlamani,

Bajpai

et al. 2024

Geological Journal

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The Kutch Basin of western India exposes one of the most complete, fossiliferous marine Cenozoic sedimentary sequences of India. Precise depositional ages of these sequences are of great importance in the reconstruction of palaeoclimatic and palaeobiogeographic histories of the basin. Due to the poorly constrained foraminiferal biostratigraphic ages, we conducted high‐resolution 87Sr/86Sr chronology of the various fossiliferous, stratigraphically continuous units of Oligocene–Miocene strata in Kutch Basin. Besides updating the previously determined 87Sr/86Sr chronology, we report new numerical depositional ages for Oligocene–Miocene formations and members, and correlated these ages to the existing biostratigraphic schemes. The new 87Sr/86Sr data indicates a depositional age range between 28.64 + 0.29/‐1.11 and 23.51 + 1.53/‐1.85 Ma (Rupelian‐Chattian) for the Maniyara Fort Formation, between 23.07 + 0.94/1.39 and 18.09 + 0.24/‐0.57 Ma (Chattian‐Burdigalian) for the Khari Nadi Formation, and between 15.11 + 0.56/‐2.87 and 12.29 + 1.22/‐1.9 Ma (Langhian‐Serravallian) for the Chhasra Formation. The sedimentation rate, determined through numerical ages derived from 87Sr/86Sr, indicates an increase in sedimentation for the Khari Nadi (0.23 ± 0.04 cm/kyr) and Chhasra (0.12 ± 0.04 cm/kyr) formations, likely related to uplift of the Himalaya‐Tibetan plateau and intensification of the Indian Summer Monsoon. The bulk sediment element ratios (V/Ni, Ni/Co and V/Cr) indicate oxic to suboxic palaeo‐redox conditions during deposition of the Oligocene–Miocene successions of the basin. Based on new and updated 87Sr/86Sr chronology, the depositional environments and sedimentation rates of the Kutch sequence are correlated with changes in sea‐level, sedimentation rates in the Arabian Sea and Bay of Bengal, and the global climate changes across the Oligocene–Miocene boundary.

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Lithium‐to‐calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells

Cited by 48 publications

References 21 publications

The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms

The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms

Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms

Strontium isotope stratigraphy of marine Oligocene–Miocene sedimentary successions of Kutch Basin, western India

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