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Biota and palaeoenvironment of a high middle-latitude Late Triassic peat-forming ecosystem from Hopen, Svalbard archipelago

S. Mcloughlin Christine Strullu-Derrien 1
1 LPG-ANGERS - Laboratoire de Planétologie et Géodynamique - Angers
LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]
Abstract :

A siliceous permineralized peat block recovered from Hopen in the Svalbard archipelago hosts a low-diversity Late Triassic flora dominated by autochthonous roots and stems of bennettitaleans and lycophytes, and parautochthonous leaves, sporangia, spores and pollen from a small range of pteridophytes and gymnosperms. Some parenchymatous bennettitalean root cells show interactions with chytrid fungi and bacteria; the remains of other fungi and fungi-like organisms are dispersed within the peat's detrital matrix. Cavities excavated through some roots and compacted detritus contain abundant coprolites probably derived from sapro-xylophagous oribatid mites, although no body fossils have yet been identified. Sparse larger coprolites containing leaf fragments attest to the presence of invertebrate folivores in the ancient ecosystem. The low-diversity flora, relatively few trophic levels and simple nutritional web, together with sedimentological aspects of the host formation and the peat structure, collectively favour accumulation of the organic mass as a fibric (root-dominated) peat within a temperate (high middle-latitude), well-aerated mire.

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https://hal.univ-angers.fr/hal-02872789
Contributeur : Okina Université d'Angers <>
Soumis le : mercredi 17 juin 2020 - 20:29:18
Dernière modification le : mardi 6 octobre 2020 - 11:40:06

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S. Mcloughlin, Christine Strullu-Derrien. Biota and palaeoenvironment of a high middle-latitude Late Triassic peat-forming ecosystem from Hopen, Svalbard archipelago. The Geology Society of London, Lyell Collection, 2015, 434 (1), pp.87-112. ⟨10.1144/SP434.4⟩. ⟨hal-02872789⟩

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