Bacterial fossils and microbial dolomite in Triassic stromatolites

Perri, Edoardo; Tucker, Maurice E.

doi:10.1130/g23354a.1

Cited by 127 publications

(56 citation statements)

References 28 publications

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“…The same mode of syn‐sedimentary to early diagenetic alteration of the organic cell walls in microfossils, thought to be formed by less resistant chemical compounds, have been observed in mineralized bacteria preserved in Triassic stromatolites (Perri & Tucker 2007). In the specimens of organic walls of bacteria‐like nannofossils (150–400 nm in diameter), the wall is formed by fabric‐destructive nano‐crystal aggregates of dolomite, appearing in a shape that mimics the ‘stacks of organic compounds’ in cell wall layers of the Cryogenian leiospheres.…”

Section: Cryogenian Microfossils and Their Cell Wall Ultrastructurementioning

confidence: 69%

Micro- and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity

Moczydłowska

Schopf

Willman

2010

LET

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S. 2010: Micro-and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity. Lethaia, Vol. 43, Recently established protocols and methods in advanced microscopy and spectrometry applied to studies of ancient unicellular organic-walled microfossils of uncertain biological affinities (acritarchs) provide new evidence of the fine ultrastructure of cell walls and their biochemistry that support the interpretation of some such microfossils as photosynthesizing microalgae. The micro-scale and nanoscale ultrastructure of the cell walls of late Cryogenian sphaeromorphic acritarchs from the Chichkan Formation (Kazakhstan) revealed by the advanced techniques and studied originally by Kempe et al. (2005) is here further analysed and compared with that of modern microalgal analogues. On the basis of such comparison, we interpret the preserved cell wall ultrastructure to reflect original layering and lamination within sub-layers of the fossil wall, rather than being a result of taphonomic and diagenetic alteration. The outer thick layer represents the primary wall and the inner layer the secondary wall of the cell, whereas the laminated amorphous sublayers, 10-20 nm in thickness and revealed by transmission electron and atomic force microscopy, are recognized as trilaminar sheath structure. Because two-layered cell walls, trilaminar sheaths and the position of the TLS within the fossil cell wall are characteristic of the mature developmental state in cyst morphogenesis in modern microalgae, we infer that the Chichkan sphaeromorphs are probably resting cells (aplanospores) of chlorophyceaen green microalgae from the order Volvocales. h Biological affinity, cell wall, Cryogenian, microfossils, ultrastructure.Małgorzata Moczydłowska [malgo.vidal@pal.uu.se],

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Section: Cryogenian Microfossils and Their Cell Wall Ultrastructurementioning

confidence: 69%

Micro- and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity

Moczydłowska

Schopf

Willman

2010

LET

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“…The past presence of microbial mats is further supported by SEM investigations, which revealed filamentous structures that may be mineralized remains of extracellular polymeric substances (EPS) (Fig. 4c) (Perri and Tucker 2007;Spadafora et al 2010). This peculiar bed in the Kössen Formation is interpreted as …”

Section: Lithostratigraphymentioning

confidence: 76%

The Triassic–Jurassic boundary in the shallow-water marine carbonates from the western Northern Calcareous Alps (Austria)

et al. 2015

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The Triassic-Jurassic (T-J) boundary coincides with one of the five biggest mass extinctions in the Phanerozoic. This event has been extensively studied in the eastern and central Northern Calcareous Alps (NCA), where the global stratotype section and point for the base of the Jurassic is outcropping. We present one of the first combined bio-, litho-and carbonate carbon isotope stratigraphic study across the T-J boundary from the western NCA, focusing on the shallow-water marine carbonate successions ''Lorüns'' and ''Steinernes Meer''. An almost complete T-J succession with the Upper Triassic Kössen Formation, the T-J Schattwald beds and the Lower Jurassic Lorüns oolite is preserved in the Lorüns section, whereas a stratigraphic hiatus at the T-J boundary is observed in the Steinernes Meer section. The carbonate carbon isotope record of Lorüns shows the characteristic T-J carbon isotope evolution with a short initial negative carbon isotope excursion (CIE) in the lower Schattwald beds, which is separated from the following and longer main negative CIE in the Lorüns oolite by a positive excursion in the upper Schattwald beds. The synchroneity of the initial and main CIE with the last occurrence of Triassic fauna and the first appearance of Jurassic ammonites suggests placing the T-J boundary at the base of the Lorüns oolite. The Steinernes Meer section records only the main negative CIE in the Lorüns oolite due to emersion and/or no sedimentation between the Upper Triassic Kössen Formation and the Lower Jurassic Lorüns oolite, caused by regression and synsedimentary tectonics. This study provides new evidence in support the hypothesis that the latest Rhaetian decrease and the Hettangian recovery of the carbonate production coinciding with the initial and main CIE, respectively, can be interpreted as evidence of acidification of the Tethys ocean due to elevated atmospheric CO 2 concentrations, probably caused by voluminous volcanic gas emissions.

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“…Recently, Huang et al (2007) have suggested that intense bacterial sulphate reduction had a direct influence on dolomite precipitation in the Feixianguan Formation. Further evidence comes by way of mineralized bacterial remains in the Triassic stromatolites (Perri and Tucker, 2007). Recently, culture experiments with sulphatereducing bacteria grown at 308C in media simulating the chemistry of an anoxic, hypersaline lagoon have demonstrated artificial dolomite precipitation (Warthmann et al, 2000).…”

Section: Discussionmentioning

confidence: 98%

Pattern of δ¹³C_carb and implications for geological events during the Permian‐Triassic transition in South China

et al. 2010

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Data from five marine sections across the Permian-Triassic boundary in southern China reveal a pattern of 13 Triassic). These complementary trends in strontium and carbon isotope data imply an extended period of enhanced continental uplift and weathering of silicates and organic matter across the PermianTriassic event boundary (PTEB). A pronounced sharp drop of d 13 C carb at the PTEB is most recognizable in the upper ramp environment of Meishan, occurs weakly in shallow water environments and cannot be discerned in the deepest water setting. We propose that this pattern reflects an enhancement of stratified-ocean conditions in the immediate aftermath of the latest Permian transgression. The sharp drop in d 13 C carb at the PTEB in the platform ramp environments likely resulted from the depth-selective calcification of 13 C-depleted dissolved inorganic carbon (DIC) formed by respiration of organic matter including, perhaps, methane. Indeed, massive volcanism at the PTEB would have enhanced eutrophication and stratification thereby slowing the mixing of 13 C-depleted DIC into deeper-water environments.

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Bacterial fossils and microbial dolomite in Triassic stromatolites

Cited by 127 publications

References 28 publications

Micro- and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity

Micro- and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity

The Triassic–Jurassic boundary in the shallow-water marine carbonates from the western Northern Calcareous Alps (Austria)

Pattern of δ¹³C_carb and implications for geological events during the Permian‐Triassic transition in South China

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Bacterial fossils and microbial dolomite in Triassic stromatolites

Cited by 127 publications

References 28 publications

Micro- and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity

Micro- and nano-scale ultrastructure of cell walls in Cryogenian microfossils: revealing their biological affinity

The Triassic–Jurassic boundary in the shallow-water marine carbonates from the western Northern Calcareous Alps (Austria)

Pattern of δ13Ccarb and implications for geological events during the Permian‐Triassic transition in South China

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Pattern of δ¹³C_carb and implications for geological events during the Permian‐Triassic transition in South China