Rhynie Chert

Trewin, Nigel H.

doi:10.1002/9780470015902.a0001624.pub3

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Thus, the TVZ siliceous sinter microstromatolites, particularly those formed in the Whangapaoa alkali-chloride spring, not only entomb species that thrive in the springs, but also fossilize biomass transported from surrounding areas or wherever spring fluids infiltrate (cf. Campbell, Buddle, & Browne, 2003;Trewin, 2013), providing information on, and preservation of, the wider geothermal environment (Walter, 1977).…”

Section: Cyanidiophyceae Dominates Microstromatolites In Highly Acidi...mentioning

confidence: 99%

Stromatolitic digitate sinters form under wide‐ranging physicochemical conditions with diverse hot spring microbial communities

et al. 2020

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Digitate siliceous hot spring deposits are a form of biomediated sinter that is relatively common in the Taupo Volcanic Zone (TVZ), New Zealand, and elsewhere on Earth. Such deposits have gained prominence recently because of their morphological similarity to opaline silica rocks of likely hot spring origin found by the Spirit rover on Mars and the consequent implications for potential biosignatures there. Here, we investigate the possible relationship between microbial community composition and morphological diversity among digitate structures from actively forming siliceous hot spring sinters depositing subaerially in shallow discharge channels and around pool rims at several physicochemically distinct geothermal fields in the TVZ. The TVZ digitate sinters range in morphologic subtype from knobby to spicular, and are shown to be microstromatolites that grow under varied pH ranges, temperatures, and water chemistries.Scanning electron microscopy and molecular analyses revealed that TVZ digitate sinters are intimately associated with a diverse array of prokaryotic and eukaryotic microorganisms, and for most digitate structures the diversity and quantity of prokaryotes was higher than that of eukaryotes. However, microbial community composition was not correlated with morphologic 3 subtypes of digitate sinter, and observations provided limited evidence that pH (acidic versus alkali) affects morphology. Instead, results suggest hydrodynamics may be an important factor influencing variations in morphology, while water chemistry, pH and temperature are strong drivers of microbial composition and diversity.

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Section: Cyanidiophyceae Dominates Microstromatolites In Highly Acidi...mentioning

confidence: 99%

Stromatolitic digitate sinters form under wide‐ranging physicochemical conditions with diverse hot spring microbial communities

et al. 2020

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“…Gymnospermous leafy twigs with anatomical details, fern petioles, fragmented pinnulae, roots, and leaves with multiple vascular bundles are preserved. Studies of silicified fossil plants from geothermal settings are abundant, most frequently addressing plants of the Rhynie chert (e.g., Channing, 2001Channing, , 2003Channing & Edwards, a, b;Edwards & Selden, 1993;Edwards et al, 1998;Kenrick & Crane, 1997;Taylor & Berbee, 2006;Trewin, 2001). These show how preservation status varies according to environmental conditions and speed of silicification.…”

Section: Incorporation Pathways For Plant Materialsmentioning

confidence: 99%

Plant Taphonomy and Paleoenvironment of the Bahía Laura Complex, Middle–Late Jurassic, at the Laguna Flecha Negra Locality (Santa Cruz Province, Argentina)

et al. 2021

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Taphonomic studies were carried out at Laguna Flecha Negra locality (Bahía Laura Complex, Middle-Late Jurassic), Santa Cruz Province, Argentina. Sedimentary facies and preservational styles were defined to recognize plant taphofacies in the studied sequence. Eleven taphofacies were identified and plant sources within a volcanic and geothermal system are proposed. Plant remains are of autochthonous to para-autochthonous origin and best preservation was found in distal facies of siliceous hot spring (sinter) systems. Lateral and vertical taphonomic differences were found in the studied sequence. These are due to changes in the sedimentary input and distance to the geothermal fluids. Results enable the reconstruction of the depositional history of this region of the Deseado Massif geological Province. We infer formation of a hotspring (sinter) system that was subsequently destroyed by a phreatic eruption process at the margin of an andesitic effusive dome in partially reworked fall pyroclastic subfacies.After the destruction of the geothermal system, a fluvial and lacustrine epiclastic subfacies developed preserving a plant community typical of the Middle-Late Jurassic of Gondwana. Later, volcanic activity produced pyroclastic subfacies, with thick ashfall and flow deposits from different sources and separated by a time gap that promoted fossilization of an in situ forest. Taphonomic studies of these plant communities allowed reconstruction of a chain of geological events and how these processes have influenced the preservation of a Jurassic flora from Patagonia, thus contributing to an understanding of the paleoecology of the Deseado Massif geological province.

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Rhynie Chert

Cited by 2 publications

References 33 publications

Stromatolitic digitate sinters form under wide‐ranging physicochemical conditions with diverse hot spring microbial communities

Stromatolitic digitate sinters form under wide‐ranging physicochemical conditions with diverse hot spring microbial communities

Plant Taphonomy and Paleoenvironment of the Bahía Laura Complex, Middle–Late Jurassic, at the Laguna Flecha Negra Locality (Santa Cruz Province, Argentina)

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