Taphonomy of the earliest Cambrian linguliform brachiopods

Forchielli, Angela; Steiner, Michael; Hu, Shixue; Lüter, Carsten; Keupp, Heiner

doi:10.4202/app.2011.0182

Cited by 2 publications

(7 citation statements)

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“…Moreover, the shell apatite of modern Lingula contains more Mg than Na (Forchielli et al . ), which is opposite to the apatite phases in fossil Ungula . These differences suggest that shell apatite has probably been somewhat altered.…”

Section: Discussionmentioning

confidence: 69%

“…On the contrary, the results of WDS (wavelength dispersive spectroscopy) microprobe analyses of the modern Lingula anatina shell by Forchielli et al . () show fluorine values around 2.6 wt% for the external laminae and 3.5 wt% for the internal laminae.…”

Section: Discussionmentioning

confidence: 95%

“…Forchielli et al . () report that the shell composition as well as microstructure of modern Lingula show no significant variation within species due to geographical and environmental factors, though the number of phosphatic laminae varies between different genera and between species in the same genus. Shell chemistry of different brachiopod genera can be somewhat varying.…”

Section: Discussionmentioning

confidence: 98%

“…LeGeros et al (1985) show that the average F content is around 2.6 wt% in Lingula and Glottidia, and is higher in the highly calcified exterior laminae than in the internal laminae. On the contrary, the results of WDS (wavelength dispersive spectroscopy) microprobe analyses of the modern Lingula anatina shell by Forchielli et al (2014) show fluorine values around 2.6 wt% for the external laminae and 3.5 wt% for the internal laminae.…”

Section: Implications For Diagenetic Recrystallization and Preservationmentioning

confidence: 91%

“…Bioapatite of modern linguliform brachiopods is a CO 3 2À and Fcontaining OH-apatite that is crystallochemically similar, but not identical to francolite (LeGeros et al 1985;Puura & Nemliher 2001). Forchielli et al (2014) report that the shell composition as well as microstructure of modern Lingula show no significant variation within species due to geographical and environmental factors, though the number of phosphatic laminae varies between different genera and between species in the same genus. Shell chemistry of different brachiopod genera can be somewhat varying.…”

Section: Implications For Diagenetic Recrystallization and Preservationmentioning

confidence: 94%

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Diagenetic fate of bioapatite in linguliform brachiopods: multiple apatite phases in shells of Cambrian lingulate brachiopod Ungula ingrica (Eichwald)

Lang

Kirsimäe

Vahur

2016

LET

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Fossil skeletal apatites vary in their composition and can yield mixed biochemical, environmental and diagenetic information. Thus, it is important to evaluate the diagenesis spatially inside the skeleton. We study the cross sections of shells of the Furongian lingulate brachiopod Ungula ingrica from Estonia using the Attenuated Total Reflectance -Fourier Transform Infrared (ATR-FTIR) microspectroscopic and energy dispersive spectroscopic (EDS) mapping and show for the first time that different structural laminae of the shell have different chemical compositions. Compact laminae are rich in PO 4 3À , Na, Mg and poor in F and Ca. Porous (baculate) laminae are rich in carbonate anions, Ca and F, but contain less Na and Mg. The ATR-FTIR spectra show further differences in the m 2 carbonate region, where the IR band at 872 cm À1 in compact laminae is replaced by a strong band at 864 cm À1 in baculate laminae. The changes in shell apatite suggest different origins of the apatite phases. Compact laminae are likely chemically less altered and could potentially carry more reliable palaeoenvironmental or geochemical information than the apatite in baculate laminae, which is mostly authigenic in its origin. □ Apatite, attenuated total reflectance map-

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Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 98%

Section: Implications For Diagenetic Recrystallization and Preservationmentioning

confidence: 91%

Section: Implications For Diagenetic Recrystallization and Preservationmentioning

confidence: 94%

See 3 more Smart Citations