Gloeocapsomorpha prisca Zalessky, 1917: A new study part II: Origin of Kukersite, a new interpretation

Foster, C.B.; Wicander, Reed; Reed, Jackie D.

doi:10.1016/s0016-6995(06)80045-8

Cited by 30 publications

(12 citation statements)

References 5 publications

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“…[20]. The kukersite consists of remains of the extinct photosynthetic organism Gloeocapsomorpha prisca, either similar to the extant cyanobacterium Entophysalis major [21,22] or green alga Botryococcus braunii [23]. The Mid-and Upper Ordovician kukersite consisting of G. prisca has a wide geography.…”

Section: Geological Backgroundmentioning

confidence: 99%

Nitrogen Isotopes in Kukersite and Black Shale Implying Ordovician-Silurian Seawater Redox Conditions

Kiipli¹,

Kiipli²

2013

Oil Shale

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For the first time data on nitrogen isotopes from the Ordovician-Silurian sedimentary rocks of the Baltic Basin are reported. Supplementary samples come from several regions worldwide. The data reveal the existence of different primary bioproductivity pathways in the Ordovician-Silurian. During the formation of black shale surface waters were oxygen-poor and maintained N 2 -fixing primary production indicated by δ 15 N -0.3‰ on average. The average δ 15 N of kukersite oil shale is +7.4‰. The positive δ 15 N values are in accordance with the formation of kukersite in oxic waters, showing that Gloeocapsomorpha prisca was a nitrate-using not N 2 -fixing cyanobacteriumlike organism. The black shale samples from the deep shelf suggest that seawater, including the photic zone, often suffered from deficiency of oxygen.

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Section: Geological Backgroundmentioning

confidence: 99%

Nitrogen Isotopes in Kukersite and Black Shale Implying Ordovician-Silurian Seawater Redox Conditions

Kiipli¹,

Kiipli²

2013

Oil Shale

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“…Although there are controversial opinions, most researchers tend to believe that the G. prisca is a photoheterotrophic cyanobacteria [7,28,[37][38][39]. After a thorough investigation of the G. priscaenriched development environment of Ordovician sediments in Estonia, Foster and his colleagues (1989,1990) believed that the G. prisca was mainly developed in intertidal zone [6,40]. In the meantime, modern ecology showed that the depth of water where macroalgae and benthic algae mainly inhabit was 30 to 60 m. In view of the effective utilization of light by phytoplangkton, it is seen, the development of G. prisca is not sensitive to the depth of water.…”

Section: Composition Characteristics Of Kerogen Pyrolysis Products Ofmentioning

confidence: 99%

Identification of the Kukersite-type source rocks in the Ordovician Stratigraphy from the Tarim Basin, NW China

et al. 2013

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“…Blokker et al (2001) state that it is generally accepted that ancient microfossils are often composed of resistant biopolymers which have been selectively preserved over time; cyanobacteria could therefore be a possible source organism for microfossils such as G. prisca, if indeed the presence of resistant biopolymers could be shown in cyanobacteria. Foster et al (1990) suggest G. prisca originates from an intertidal, marine, mat-forming benthic cyanobacterium similar to the extant cyanobacterium, Entophysalis major. Such properties have recently been described for Chlorogloeopsis (Pepe-Ranney et al, 2012).…”

Section: Introductionmentioning

confidence: 95%

Investigation of the presence of an aliphatic biopolymer in cyanobacteria: Implications for kerogen formation

Biller

Ross

Skill

2015

Organic Geochemistry

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a b s t r a c tAlgaenan has been suggested to be one of the main precursors of certain kerogens. It is a non-hydrolysable and insoluble biomolecule of high molecular weight. It has been found in a limited number of microalgae species. There is considerable uncertainty about its formation and preservation, as well as its role in kerogen formation and the implications for the global C cycle. We tested whether the cyanobacterium Chlorogloeopsis fritschii can synthesise a biomacromolecule similar to algaenan with potential to contribute to kerogen via selective preservation. Two freshwater green microalgae, Pseudochoricystis ellipsoidea and Scenedesmus obliquus, as well as C. fritschii, were subjected to harsh solvent extraction and hydrolysis steps to obtain an insoluble and non-hydrolysable macromolecule. The residues from all three species were analysed using pyrolysis-gas chromatography-mass spectrometry and solid-state nuclear magnetic resonance spectroscopy. The analysis revealed that C. fritschii indeed contains a resistant biomacromolecule exhibiting the characteristic aliphatic structure of algaenan, similar to the algaenan residues from the two microalgae. Due to the robust nature of Chlorogloeopsis compared with eukaryotes, it can prevail in extreme environmental conditions such as freezing, thawing, desiccation and overheating -conditions prevalent on the primeval earth. The presence of a resistant aliphatic biopolymer in Chlorogloeopsis suggests that cyanobacteria could have contributed to kerogen via selective preservation.

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Gloeocapsomorpha prisca Zalessky, 1917: A new study part II: Origin of Kukersite, a new interpretation

Cited by 30 publications

References 5 publications

Nitrogen Isotopes in Kukersite and Black Shale Implying Ordovician-Silurian Seawater Redox Conditions

Nitrogen Isotopes in Kukersite and Black Shale Implying Ordovician-Silurian Seawater Redox Conditions

Identification of the Kukersite-type source rocks in the Ordovician Stratigraphy from the Tarim Basin, NW China

Investigation of the presence of an aliphatic biopolymer in cyanobacteria: Implications for kerogen formation

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