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Disrupted vegetation as a response to Jurassic volcanism in southern Sweden
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
Geology Department, University of Lund.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-6723-239X
2016 (English)In: Geological Society of London Special Publications, ISSN ISSN 0305-8719, Vol. 434, 127-147 p.Article in journal (Refereed) Published
Abstract [en]

Central Skåne (Scania) in southern Sweden hosts evidence of extensive Jurassic volcanism in the form of mafic volcanic plugs and associated volcaniclastic deposits that entomb well preserved macro-plant and spore–pollen assemblages. Palynological assemblages recovered from the Höör Sandstone are of Hettangian–Pliensbachian age and those from the overlying lahar deposits are dated as Pliensbachian–early Toarcian (?). Palynomorph assemblages from these units reveal significantly different ecosystems, particularly with respect to the gymnospermous components that represented the main canopy plants. Both palynofloras are dominated by osmundacean, marattiacean and cyatheacean fern spore taxa but, whereas the Höör Sandstone hosts abundant Chasmatosporites spp. pollen produced by plants related to cycadophytes, the volcanogenic deposits are dominated by cypress family pollen (Perinopollenites) with an understorey component rich in putative Erdtmanithecales (or possibly Gnetales), and collectively representing vegetation of disturbed habitats. Permineralized conifer wood attributed to Protophyllocladoxylon sp., belonging to plants that probably produced the abundant Perinopollenites grains, is abundant in the volcanigenic strata, and shows sporadic intraseasonal and multi-year episodes of growth disruption. Together with the relatively narrow but marked annual growth rings, and the annual and mean sensitivity values that span the complacent–sensitive domains, these features suggest growth within Mediterranean-type biomes subject to episodic disturbance.

Place, publisher, year, edition, pages
Geological Society of London, 2016. Vol. 434, 127-147 p.
Keyword [en]
Volcanism, palaeoclimate, palynology, fossil wood, Skåne
National Category
Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-1906DOI: doi.org/10.1144/SP434.17OAI: oai:DiVA.org:nrm-1906DiVA: diva2:1047126
Funder
Swedish Research Council, 2015-04264Swedish Research Council, 2014-5234
Note

Part of the special issue Mesozoic Biotas of Scandinavia and its Arctic Territories edited by: Kear, B. P., Lindgren, J., Hurum, J. H., Milàn, J. & Vajda, V.

Available from: 2016-11-16 Created: 2016-11-16Bibliographically approved

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