Refining the temperature dependence of the oxygen and clumped isotopic compositions of structurally bound carbonate in apatite

Löffler, Niklas; Fiebig, Jens; Mulch, Andreas; Tütken, Thomas; Schmidt, Burkhard; Bajnai, Dávid; Conrad, Anika C.; Wacker, Ulrike; Böttcher, Michael E.

doi:10.1016/j.gca.2019.03.002

Cited by 15 publications

(70 citation statements)

References 132 publications

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“…Stable carbon and oxygen isotopic compositions of biologically precipitated apatite in fossil bone, teeth, scales and eggshells give information on the diet, behaviour, and physiology of the species ( Eagle et al., 2015 ; Sarkar et al., 1991 ; Laskar, 2017 ; Löffler et al., 2019 ). The oxygen isotope ratio of biogenic carbonates, in particular, is often used for delineating the body temperature, but it requires knowledge of the isotopic composition of internal body water medium (which can only be inferred indirectly, like from fossil bones; Kohn and Law, 2006 ).…”

Section: Introductionmentioning

confidence: 99%

Variable thermoregulation of Late Cretaceous dinosaurs inferred by clumped isotope analysis of fossilized eggshell carbonates

Laskar

Mohabey

Bhattacharya

et al. 2020

Heliyon

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The thermal physiology of non-avian dinosaurs, especially the endothermic/ectothermic nature of their metabolism, inferred indirectly using body mass, biophysical modelling, bone histology and growth rate, has long been a matter of debate. Clumped isotope thermometry, based on the thermodynamically driven preference of 13 C- 18 O bond in carbonate minerals of fossilized eggshells, yields temperature of egg formation in the oviduct and can delineate the nature of thermoregulation of some extinct dinosaur taxa. In the present study, the clumped isotope thermometry was applied to the eggshells of a few species of modern birds and reptiles to show that it is possible to obtain the body temperatures of these species in most of the cases. We then used this method to the fossil eggshells of Late Cretaceous sauropods and theropods recovered from western and central India. The estimated body temperatures varied between 29 °C and 46 °C, with an overall average of 37 °C, significantly higher than the environmental temperature (about 25 °C) of this region during the Late Cretaceous. The results also show that the theropod species with low body masses (~800 kg) had high body temperature (~38 °C), while some gigantic (~20000 kg) sauropods had low body temperatures that were comparable to or slightly higher than the environmental temperature. Our analyses suggest that these Late Cretaceous giant species were endowed with a capacity of variable thermoregulation to control their body temperature.

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Section: Introductionmentioning

confidence: 99%

Variable thermoregulation of Late Cretaceous dinosaurs inferred by clumped isotope analysis of fossilized eggshell carbonates

Laskar

Mohabey

Bhattacharya

et al. 2020

Heliyon

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“…Specific conditions must have been present that enabled the retention of phosphorus in the microbial mat. The cohesive EPS meshwork of the bacterial mat may have hindered the diffusion of phosphorus into bottom waters, causing pore water supersaturation and subsequent precipitation of amorphous or other metastable phosphate minerals (Soudry and Nathan, 2001;Lécuyer et al, 2010;Löffler et al, 2019). Since phosphate minerals such as hydroxyapatite and CFA are less soluble at lower pH than calcite (Nathan and Sass, 1981;Coleman, 1985;Van Cappellen and Berner, 1991;Carlsson et al, 1997), precipitation of apatite precursors only occurred after calcite precipitation, which lowered alkalinity and pH in the ambient solution by consuming carbonate ions and releasing protons (Tribovillard et al, 2010).…”

Section: Phosphogenesis At An Ancient Hydrocarbon Seepmentioning

confidence: 99%

“…Moreover, only rapid carbonate cementation and phosphate mineral formation would have retained the structure of the microbial mat with coated grains and spheroidal calcite (Figure 2). The phosphate minerals were probably amorphous or other metastable precursors at first, and then re-crystallized to more stable CFA (Compton et al, 2002;Lécuyer et al, 2010;Löffler et al, 2019).…”

Section: Phosphogenesis At An Ancient Hydrocarbon Seepmentioning

confidence: 99%

Mineral authigenesis within chemosynthetic microbial mats: Coated grain formation and phosphogenesis at a Cretaceous hydrocarbon seep, New Zealand

Zwicker

Smrzka

Steindl

et al. 2020

The Depositional Record

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“…Since 2010, clumped isotope (Δ47) thermometry, which bases on the temperature dependent abundance of 13 C-18 O bonds, has repeatedly been used to measure precipitation temperatures of carbonate-bearing biotic minerals such as modern and fossil tooth enamel and eggshell carbonate (e.g. Eagle et al, 2010Eagle et al, , 2011Eagle et al, , 2015Wacker et al, 2016;Löffler et al, 2019;Dawson et al, 2020). Thus far, Δ47 thermometry has been applied to reconstruct body temperatures of birds (e.g.…”

Section: Determining the Thermophysiology Of Dinosaursmentioning

confidence: 99%

“…Eagle et al, 2010, sharks (e.g. Löffler et al, 2019), Archosauria (Alligators) and Dinosauria (Ornithischia, and Saurischia, incl.…”

Section: Determining the Thermophysiology Of Dinosaursmentioning

confidence: 99%

Clumped isotope thermometry techniques and their application to fossil teeth and pedogenic carbonates

Löffler¹

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This Ph.D. thesis demonstrates i) the highly precise performance of refined and new analytical setups for clumped isotope analysis (Δ47 and Δ48) and ii) the applicability of clumped isotope analyses to biogenic and abiogenic carbonated apatite (Δ47) and abiogenic carbonates (Δ47 and Δ48) for research related to paleothermophysiology and paleoclimatology, whereas the overall analytical precision has been increased. A comprehensive Δ47 dataset with 122 replicate analyses is provided from which the temperature dependence of Δ47 for (bio)apatite (Δ47-1/T2) is calculated between 1 °C and 80 °C. The temperature dependence of oxygen isotope equilibrium fractionation between carbonated synthetic apatite and water (1,000ln(αCHAP-H2O)) is experimentally determined. When applied to tooth enameloid from a modern Greenland shark (Somniosus microcephalus), a Late Miocene megatooth shark (Carcharodon megalodon), and an Upper Cretaceous Tyrannosaurus rex, reconstructed Δ47-based temperatures and δ18OH2O are in line with previously published data. An analytical setup for highly precise clumped isotope analysis is described that allows for the simultaneous measurement of ∆47 and ∆48 in CO2 with external reproducibilities close to the respective shot-noise limits. The analyte gases originate from pure carbonates that were digested in hypersaturated orthophosphoric acid and purified using a fully automated device. Δ47 data sets with 117 replicate analyses in total on 22 pedogenic carbonate nodules from two Spanish Middle Miocene sections reveal the continental Southern European thermal structure during the end of the Middle Miocene Climatic Optimum (MCO) and the complete Middle Miocene Climatic Transition (MMCT; from 15.33 to 12.98 Ma).

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Refining the temperature dependence of the oxygen and clumped isotopic compositions of structurally bound carbonate in apatite

Cited by 15 publications

References 132 publications

Variable thermoregulation of Late Cretaceous dinosaurs inferred by clumped isotope analysis of fossilized eggshell carbonates

Variable thermoregulation of Late Cretaceous dinosaurs inferred by clumped isotope analysis of fossilized eggshell carbonates

Mineral authigenesis within chemosynthetic microbial mats: Coated grain formation and phosphogenesis at a Cretaceous hydrocarbon seep, New Zealand

Clumped isotope thermometry techniques and their application to fossil teeth and pedogenic carbonates

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