Apatite for destruction: Isotopic and geochemical analyses of bioapatites and sediments from the Upper Devonian Escuminac Formation (Miguasha, Québec)

Matton, Olivier; Cloutier, Richard; Stevenson, Ross

doi:10.1016/j.palaeo.2012.08.004

Cited by 10 publications

(10 citation statements)

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“…The presence of an amorphous fraction is suggested by a weak broad band at 12˝in the diffraction pattern (Figure 6d). Overall, these results are consistent with previously published data [35,36] showing the occurrence of quartz, calcite and smaller proportions of illite, muscovite, chlorite, plagioclase and amorphous organic matter. This mineralogical composition has been interpreted as resulting from shallow burial diagenesis and early formation of diagenetic calcite [35,36].…”

Section: Mineralogical Analysis Of Triazeugacanthus Skeletonsupporting

confidence: 93%

“…Modification of the mineral composition of fossil bones (e.g., presence of authigenic calcite) from the Escuminac Formation has been previously reported in the placoderm Bothriolepis canadensis and the osteolepiform Eusthenopteron foordi [36]. Bioapatites usually display small particle sizes and significant carbonate contents [15,52].…”

Section: Preservation Versus Recrystallization Of Triazeugacanthus Timentioning

confidence: 91%

“…Miguasha Konservat-and Konzentrat-Lagerstätte horizons occur mostly in the transgressive phases and primarily towards the maximum paleodepth water [22]. Sedimentological and geochemical investigations have shown that the Escuminac Formation has been subjected only to a shallow burial diagenesis (depth < 1500 m, T < 430˝C) [35,36,48]. The clay mineral fraction is considered to be mostly detrital whereas calcite cement and fibrous calcite are attributed to early diagenesis of organic matter [35].…”

Section: Preservation Versus Recrystallization Of Triazeugacanthus Timentioning

confidence: 99%

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New Insights in the Ontogeny and Taphonomy of the Devonian Acanthodian Triazeugacanthus affinis From the Miguasha Fossil-Lagerstätte, Eastern Canada

2015

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Progressive biomineralization of a skeleton occurs during ontogeny in most animals. In fishes, larvae are poorly mineralized, whereas juveniles and adults display a progressively more biomineralized skeleton. Fossil remains primarily consist of adult specimens because the fossilization of poorly-mineralized larvae and juveniles necessitates exceptional conditions. The Miguasha Fossil-Lagerstätte is renowned for its Late Devonian vertebrate fauna, revealing the exceptional preservation of fossilized ontogenies for 14 of the 20 fish species from this locality. The mineralization of anatomical structures of the acanthodian Triazeugacanthus affinis from Miguasha are compared among larval, juvenile and adult specimens using Energy Dispersive X-ray Spectrometry. Chemical composition of anatomical structures of Triazeugacanthus reveals differences between cartilage and bone. Although the histology and anatomy is well-preserved, Fourier transform infrared spectrometry shows that the original chemical composition of bone is altered by diagenesis; the mineral phase of the bone (i.e., hydroxyapatite) is modified chemically to form more stable carbonate-fluorapatite. Fluorination occurring in mineralized skeletal structures of adult Triazeugacanthus is indicative of exchanges between groundwater and skeleton at burial, whereas the preservation of larval soft tissues is likely owing to a rapid burial under anoxic conditions. The exceptional state of preservation of a fossilized ontogeny allowed us to characterize chemically the progressive mineralization of the skeleton in a Devonian early vertebrate.

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Section: Mineralogical Analysis Of Triazeugacanthus Skeletonsupporting

confidence: 93%

Section: Preservation Versus Recrystallization Of Triazeugacanthus Timentioning

confidence: 91%

Section: Preservation Versus Recrystallization Of Triazeugacanthus Timentioning

confidence: 99%

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New Insights in the Ontogeny and Taphonomy of the Devonian Acanthodian Triazeugacanthus affinis From the Miguasha Fossil-Lagerstätte, Eastern Canada

2015

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“…Geochemical analyses of both sediment and bony elements from the Escuminac Formation also suggest a transitional environment. The strontium isotope ratio of Escuminac bony fragments reveals a Frasnian seawater signature, suggesting a slight diagenetic contamination, although fitting within the transitional range (Matton et al 2012). Some facies contain evidence of tidal influence, such as thin rhythmites showing daily and lunar cycles .…”

Section: Paleoenvironment Of the Escuminac Formationmentioning

confidence: 87%

“…An estuarine interpretation best accommodates the different lines of evidence provided by the fauna , the palynofacies , the trace fossil assemblage (Maples 1996), the sedimentological and stratigraphic setting of the formation (Hesse and Sawh 1992;, and the geochemistry of the sedimentary rocks and bones (Schmitz et al 1991;Vézina 1991;El Albani et al 2002;Matton et al 2012).…”

Section: Paleoenvironment Of the Escuminac Formationmentioning

confidence: 99%

Great Canadian Lagerstätten 4. The Devonian Miguasha Biota (Québec): UNESCO World Heritage Site and a Time Capsule in the Early History of Vertebrates

Cloutier¹

2013

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Over the past 170 years, the Late Devonian Miguasha biota from eastern Canada has yielded a diverse aquatic assemblage including 20 species of lower vertebrates (anaspids, osteostracans, placoderms, acanthodians, actinopterygians and sarcopterygians), a more limited invertebrate assemblage, and a continental component including plants, scorpions and millipedes. Originally interpreted as a freshwater lacustrine environment, recent paleontological, taphonomic, sedimentological and geochemical evidence corroborates a brackish estuarine setting. Over 18,000 fish specimens have been recovered showing various modes of fossilization, including uncompressed material and soft-tissue preservation. Most vertebrates are known from numerous, complete, articulated specimens. Exceptionally well-preserved larval and juvenile specimens have been identified for 14 out of the 20 species of fishes, allowing growth studies. Numerous horizons within the Escuminac Formation are now interpreted as either Konservat– or Konzentrat–Lagerstätten.SOMMAIREAu cours des 170 dernières années, le biote du Dévonien supérieur de Miguasha de l’Est du Canada a fourni un assemblage aquatique diversifié, comprenant 20 espèces de vertébrés inférieurs (anaspides, ostéostracés, placodermes, acanthodiens, actinoptérygiens et sarcoptérygiens) et un assemblage peu diversifié d’invertébrés ainsi qu’une composante continentale, représentée par des plantes, des scorpions et des mille-pattes. À l’origine interprété comme un milieu lacustre d’eau douce, les dernières preuves paléontologiques, taphonomiques, sédimentologiques et géochimiques confirment un environnement saumâtre rappelant celui d’un estuaire. Plus de 18,000 fossiles de poissons ont été découverts montrant différents états de conservation, notamment en trois dimensions et la préservation de tissus mous. La plupart des vertébrés sont connus par de nombreux spécimens complets et articulés. Des spécimens de larves et de juvéniles, exceptionnellement bien conservés, ont été identifiées pour 14 des 20 espèces de poissons permettant des études détaillées de leur croissance. De nombreux horizons au sein de la Formation d’Escuminac sont interprétés soit comme des Konservat– ou Konzentrat–Lagerstätten.

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Miguasha National Park, Canada

Claudino-Sales

2018

Coastal World Heritage Sites

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Apatite for destruction: Isotopic and geochemical analyses of bioapatites and sediments from the Upper Devonian Escuminac Formation (Miguasha, Québec)

Cited by 10 publications

References 72 publications

New Insights in the Ontogeny and Taphonomy of the Devonian Acanthodian Triazeugacanthus affinis From the Miguasha Fossil-Lagerstätte, Eastern Canada

New Insights in the Ontogeny and Taphonomy of the Devonian Acanthodian Triazeugacanthus affinis From the Miguasha Fossil-Lagerstätte, Eastern Canada

Great Canadian Lagerstätten 4. The Devonian Miguasha Biota (Québec): UNESCO World Heritage Site and a Time Capsule in the Early History of Vertebrates

Miguasha National Park, Canada

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