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Disrupted vegetation as a response to Jurassic volcanism in southern Sweden

Vajda, Vivi LU ; Linderson, Hans LU and McLoughlin, Stephen (2016) In Geological Society Special Publication 434(1). p.127-147
Abstract

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... (More)

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.

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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Geological Society Special Publication
volume
434
issue
1
pages
21 pages
publisher
Geological Society of London
external identifiers
  • scopus:84970029004
ISSN
03058719
DOI
10.1144/SP434.17
language
English
LU publication?
yes
id
5faa467b-35f8-4d88-8fc8-b9e34f18751c
date added to LUP
2017-02-23 08:29:20
date last changed
2017-04-09 04:55:13
@inbook{5faa467b-35f8-4d88-8fc8-b9e34f18751c,
  abstract     = {<p>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.</p>},
  author       = {Vajda, Vivi and Linderson, Hans and McLoughlin, Stephen},
  issn         = {03058719},
  language     = {eng},
  number       = {1},
  pages        = {127--147},
  publisher    = {Geological Society of London},
  series       = {Geological Society Special Publication},
  title        = {Disrupted vegetation as a response to Jurassic volcanism in southern Sweden},
  url          = {http://dx.doi.org/10.1144/SP434.17},
  volume       = {434},
  year         = {2016},
}