Geochemical analysis and paleoecological implications of phosphatic microspherules (otoliths?) from Frasnian–Famennian boundary strata in the Great Basin, USA

Giles, Katherine A.; McMillan, Nancy J.; McCarson, Brian L

doi:10.1016/s0031-0182(01)00475-8

Cited by 17 publications

(41 citation statements)

References 36 publications

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“…6B), most likely reflecting calcium phosphate. This value corresponds to that of biogenic apatite, such as bone fossils, otholiths, and fish teeth (Giles et al, 2002). Chemical composition of biogenic apatite could potentially be altered during burial.…”

Section: Silicamentioning

confidence: 83%

Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events

Kuroda

Ohkouchi²,

Ishii

et al. 2005

Geochimica et Cosmochimica Acta

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Section: Silicamentioning

confidence: 83%

Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events

Kuroda

Ohkouchi²,

Ishii

et al. 2005

Geochimica et Cosmochimica Acta

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“…This event is identified between the linguiformis Zone and the Lower triangularis Zone, and was global and isochronous [1,2] . Numerous studies have been done on the F-F event, including variation in Ce anomalies [3] , comparisons of C, O, Sr and S isotope patterns [4][5][6][7][8][9][10] , paleoenvironmental and paleoecological changes [11,12] , high-resolution sequence stratigraphy and cyclostratigraphy [13,14] , magnetostatigraphy [15] , and event-stratigraphy [16,17] . Extraterrestrial (the impact of bolides on the earth) and terrestrial geneses are the bipolar interpretations of the F-F event for a long time.…”

mentioning

confidence: 99%

Devonian Frasnian-Famennian transitional event deposits of Guangxi, South China and their possible tsunami origin

Gong

Zeng

et al. 2008

Sci. China Ser. D-Earth Sci.

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A suite of event deposits, isochronous and interrelated in origin, occurs widely near the FrasnianFamennian boundary in Guangxi, South China. It is mainly distributed in the facies areas of the platform-margin slope and inter-platform rift-trough. The rudstone or calcirudite occur in the Liujing section of Hengxian and Luoxiu and Baqi sections of Xiangzhou in the facies area of platform-margin slope. The turbidites are observed in the sections of Yangdi and Baisha of Guilin, Du'an of Debao, Nandong and Sanli of Wuxuan, Xiangtian, Ma'anshan of Xiangzhou, Nayi of Chongzuo, Yunpan of Shanglin in the facies area of inter-platform rift-trough. The massive homogenites occur in sections of Mangchang, Luofu and Road from Nandan to Tian'e and Ma'anshan etc in the facies area of inter-platform rift-trough. Herein event deposits can be correlated in stratohorizon to the turbidite in the bottom of the Lower triangularis Zone in Hony railroad cut of Belgium, Devils Gate of Nevada, USA, Atrous of Morocco, South Urals and Fore-Kolyma of northeastern Siberia of Russia, and erosional discontinuities and brecciation in the Frasnian-Famennian boundary in South Polish-Moravian shelf. The event deposits could be caused by a violent tsunami related to bolide impacts into ocean.

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“…Giles et al . ). Eisenack () subsequently described a range of phosphatic microfossils from the Silurian of Gotland, Sweden, including spherules identical to those of Oakley ().…”

mentioning

confidence: 97%

“…Giles et al . () analysed Late Devonian phosphatic micro‐spherules fitting the description of ‘conodont pearls’ sensu Glenister et al . (), and compared their chemistry with that of coeval conodonts and acanthodian/actinopterygian fish teeth.…”

mentioning

confidence: 99%

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Palaeozoic ‘conodont pearls’ and other phosphatic micro-spherules

Lindskog

Eriksson

Bergström

et al. 2017

LET

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Sub‐millimetre‐sized phosphatic spherules are often found in acetic acid‐insoluble residues produced for microfossil extraction. As they are typically associated with conodont elements and have a similar chemical composition, they are informally known as ‘conodont pearls’. Still, the origin of these micro‐spherules has been controversial, and authors have disagreed regarding their mode of formation, or if they are biogenic or not. In this study, an assortment of micro‐spherules from several localities and stratigraphical levels were analysed using multiple methods, in an effort to shed light on the origin of these enigmatic objects: ocular investigation with a stereomicroscope, chemical analyses employing energy‐dispersive mass spectrometry, imaging through scanning electron microscope, and synchrotron radiation X‐ray tomographic microscopy. Collectively, the techniques employed allow for near‐complete characterization and description of the study specimens. At least five different groups, or morphotypes, of spherules can be discerned, which differ both in morphological and chemical details. Most specimens are notably spherical and display concentric layers of growth. Several of the specimens have a central nucleus, sometimes with one or more objects located closely together. Internal details and chemistry suggest that the phosphatic spherules probably are of different origin. Thus, the term ‘conodont pearl’ encompasses confusingly similar objects deriving from different organisms and/or processes, and only careful analysis can reveal their individual origin. The only organisms unequivocally associated with (in situ) phosphatic micro‐spherules are ceramoporid bryozoans, and the conodonts Cordylodus and Westergaardodina, but the possible function and significance of these objects remain enigmatic.

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Geochemical analysis and paleoecological implications of phosphatic microspherules (otoliths?) from Frasnian–Famennian boundary strata in the Great Basin, USA

Cited by 17 publications

References 36 publications

Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events

Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events

Devonian Frasnian-Famennian transitional event deposits of Guangxi, South China and their possible tsunami origin

Palaeozoic ‘conodont pearls’ and other phosphatic micro-spherules

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