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Hans Linderson

Hans Linderson

Forskningsingenjör

Hans Linderson

Disrupted vegetation as a response to Jurassic volcanism in southern Sweden

Författare

  • Vivi Vajda
  • Hans Linderson
  • Stephen McLoughlin

Summary, in English

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 wellpreserved 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 Höö r 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.

Avdelning/ar

  • Geologiska institutionen

Publiceringsår

2016

Språk

Engelska

Sidor

127-147

Publikation/Tidskrift/Serie

Geological Society Special Publication

Volym

434

Issue

1

Dokumenttyp

Del av eller Kapitel i bok

Förlag

Geological Society of London

Ämne

  • Geology
  • Other Earth and Related Environmental Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 03058719