uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Late Ordovician Faunal Distribution and Ecospace Partitioning in Marine Impact Craters: The Aftermath of the Lockne and Tvären Events
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Palaeobiology)
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the Middle to Late Ordovician a boost of marine biodiversity occurred which is regarded as the most rapid diversity in Earth’s history, and termed the Great Ordovician Biodiversification Event. This time is also unique in that at least four marine meteorite craters with a good record of post-impact sediments are preserved in Baltoscandia. Catastrophic impacts can serve as constructive events and produce wide-ranging environments providing new ecological niches for a diverse biota to occupy. Additionally, they generate distinctive patterns of biological destruction and recovery. This, and the study of distribution and ecospace utilisation of Late Ordovician faunas, has been analysed in two almost contemporary (around 455 million years ago) meteorite craters (Lockne and Tvären, Sweden). Within the confined space of the impact craters environments varied from shallow and reef-like to over 200 m in depth and from well oxygenated to hypoxic. These types of environments favored colonization of different individual groups. In Tvären rhynchonelliformean brachiopod assemblages from the shallow crater rim include a range of morphotypes, not established elsewhere in the crater. Within the crater depression rhynchonelliformean brachiopods were not established until the upper third of the remaining crater fill. Colonization of post-impact faunas varies dependent on topography, depth and susbstrate within the impact craters. This is recognised for scolecodonts in Tvären and for gastropod-like mollusks, linguliform and craniiform brachiopods in both of the craters, as they inhabit a wide range of ecospace. A succession of different taxa is observed from the deepest part of each crater and upwards towards inferably more shallow, higher energy, water settings. The development of new community types and narrowly-defined niches in the craters helped further drive both α and β biodiversity during a critical phase of the Great Ordovician Biodiversification Event.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2009. , p. 45
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 685
Keywords [en]
impact crater, Lockne, Tvären, ecospace, the Great Ordovician Biodiversification Event
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-109605ISBN: 978-91-554-7639-7 (print)OAI: oai:DiVA.org:uu-109605DiVA, id: diva2:273167
Public defence
2009-12-04, Axel Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2009-11-09 Created: 2009-10-20 Last updated: 2009-11-12
List of papers
1. Facies distribution of post- impact sediments in the Ordovician Lockne and Tvären impact craters: Indications for unique impact-generated environments
Open this publication in new window or tab >>Facies distribution of post- impact sediments in the Ordovician Lockne and Tvären impact craters: Indications for unique impact-generated environments
2007 (English)In: Meteoritics and Planetary Science, ISSN 1086-9379, E-ISSN 1945-5100, Vol. 42, no 11, p. 1971-1984Article in journal (Refereed) Published
Abstract [en]

The Lockne and Tvaren craters formed in the Late Ordovician Baltoscandian epicontinental sea. Both craters demonstrate similarities concerning near-synchronous age, target seabed, and succeeding resurge deposits; however, the water depths at the impact sites and the sizes of the craters were not alike. The post-impact sedimentary succession of carbonates, i.e., the Dalby Limestone, deposited on top of the resurge sediments in the two craters, is nevertheless similar. At least three main facies of the Dalby Limestone were established in the Lockne crater, depending on sea-floor topography, location with respect to the crater, and local water currents. The dominating nodular argillaceous facies, showing low values of inorganic carbon (IC), was distributed foremost in the deeper and quiet areas of the crater floor and depressions. At the crater rim, consisting of crushed crystalline basement ejecta, a rim facies with a reef-like fauna was established, most certainly due to topographical highs and substrate-derived nutrients. Between these facies are occurrences of a relatively thick-bedded calcilutite rich in cephalopods (cephalopod facies). In Tvaren, the lower part of the succession consists of an analogous argillaceous facies, also showing similar low IC values as in Lockne, followed by calcareous mudstones with an increase of IC. Occasionally biocalcarenites with a distinctive fauna occur in the Tvaren succession, probably originating as detritus from a facies developed on the rim. They are evident as peaks in IC and lows in organic carbon (Corg). The fauna in these biocalcarenites corresponds very well with those of erratic boulders derived from Tvaren; moreover, they correspond to the rim facies of Lockne except for the inclusion of photosynthesizing algae, indicating shallower water at Tvaren than Lockne. Consequently, we suggest equivalent distribution patterns for the carbonates of the Dalby Limestone in Lockne and Tvaren.

National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-12757 (URN)10.1111/j.1945-5100.2007.tb00554.x (DOI)000253937700011 ()
Available from: 2008-05-19 Created: 2008-05-19 Last updated: 2017-12-11Bibliographically approved
2. Paragastropoda, Tergomya and Gastropoda (Mollusca) from the Upper Ordovician Dalby Limestone, Sweden
Open this publication in new window or tab >>Paragastropoda, Tergomya and Gastropoda (Mollusca) from the Upper Ordovician Dalby Limestone, Sweden
2007 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 129, no 2, p. 83-99Article in journal (Refereed) Published
Abstract [en]

A fauna of 12 species of paragastropods, tergomyans and gastropods is described from the Upper Ordovician (Kukruse Stage to Idavare substage) Dalby Limestone of Tvären, Lockne, and Fjäcka (Sweden), presenting a higher diversity than previously recognized. The presence of Mimospira, Laeogyra, Sarkanella epelys n. sp. indicates a strong faunal connection with Bohemia, Czech Republic. Sarkanella is reported from outside Bohemia for the first time. Bucania erratica n. sp. represents one of the earliest records of the genus in Baltoscandia. A single case of shell repair from failed predation is recorded in this species. Synonyms for Eccyliopterus princeps Remelé and E. regularis Remelé are proposed. The significance of Laeogyra, Eccyliopterus, and Deaechospira for regional correlation within the Upper Ordovician of Baltoscandia is confirmed.

Keywords
Biogeography, Dalby Limestone, Fjäcka, Gastropoda, Lockne, Paragastropoda, Sweden, Tergomya, Tvären, Upper Ordovician
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-11257 (URN)10.1080/11035890701292083 (DOI)000248408400004 ()
Available from: 2007-12-29 Created: 2007-12-29 Last updated: 2017-12-11Bibliographically approved
3. Marine astrobleme palaeoecology in the early Late Ordovician of Sweden  
Open this publication in new window or tab >>Marine astrobleme palaeoecology in the early Late Ordovician of Sweden  
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-109569 (URN)
Available from: 2009-10-20 Created: 2009-10-19 Last updated: 2010-01-14
4. Late Ordovician brachiopod distribution and ecospace partitioning in the Tvären crater system, Sweden
Open this publication in new window or tab >>Late Ordovician brachiopod distribution and ecospace partitioning in the Tvären crater system, Sweden
2013 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 369, p. 114-124Article in journal (Refereed) Published
Abstract [en]

Patterns of distribution and ecospace utilization of Late Ordovician brachiopods in a recently formed, contemporary meteorite crater are described and analyzed. Rhynchonelliformean brachiopod communities, dominated by a wide range of orthides and strophomenides, colonized the newly formed crater. At the crater rim communities were established early on, although the crater depression was not inhabited until deposition of the upper third of the remaining crater fill. The crater formed a protected but restricted microenvironment where sediments four times the thickness of the nearby basinal succession accumulated. Within this narrow space environments varied from shallow-water to deeper-waters, about 200 m in depth, and from well oxygenated to hypoxic. Such varied environments generated a rough ecological landscape, facilitating niche partitioning across a relatively small geographic area. Analysis of the guild structure of the fauna permits explanation of a local biodiversity hotspot in otherwise low-diversity strata elsewhere in the Scandinavian region. The Tvären impact event had an important palaeobiologic effect upon the fossil record as it served as a local pump and reservoir for biodiversity. Moreover the development of new community types and narrowly-defined niches helped further drive both α and β biodiversity during a critical phase of the Great Ordovician Biodiversification Event.

National Category
Geology
Research subject
Historical Geology and Paleontology
Identifiers
urn:nbn:se:uu:diva-109567 (URN)10.1016/j.palaeo.2012.10.008 (DOI)000315127200010 ()
Available from: 2009-10-20 Created: 2009-10-19 Last updated: 2017-12-12Bibliographically approved
5. Palaeoenvironmental aspects of Late Ordovician (Sandbian) Sericoidea shell concentrations in an impact crater, Tvären, Sweden.
Open this publication in new window or tab >>Palaeoenvironmental aspects of Late Ordovician (Sandbian) Sericoidea shell concentrations in an impact crater, Tvären, Sweden.
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-109602 (URN)
Available from: 2009-10-20 Created: 2009-10-20 Last updated: 2010-01-14
6. Diversity and distribution of post-impact Linguliform and Craniiform brachiopod colonizers in Upper Ordovician marine impact craters
Open this publication in new window or tab >>Diversity and distribution of post-impact Linguliform and Craniiform brachiopod colonizers in Upper Ordovician marine impact craters
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
National Category
Geology
Research subject
Historical Geology and Paleontology
Identifiers
urn:nbn:se:uu:diva-109568 (URN)
Available from: 2009-10-20 Created: 2009-10-19 Last updated: 2012-12-11Bibliographically approved
7. Gastropods from the Upper Ordovician (Viru-Harju) of the Fågelsång area, Scania, southern Sweden
Open this publication in new window or tab >>Gastropods from the Upper Ordovician (Viru-Harju) of the Fågelsång area, Scania, southern Sweden
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-109601 (URN)
Available from: 2009-10-20 Created: 2009-10-20 Last updated: 2010-03-29

Open Access in DiVA

fulltext(1626 kB)745 downloads
File information
File name FULLTEXT01.pdfFile size 1626 kBChecksum SHA-512
a29a1aefeb4442edb519636949cd4bb86d2531879b7bd6f81d55ae9e64f885fdec52b94d3bc9b3048aa7cdbaa46651abe317fc54e7221dcea8e205f1aca7ef4b
Type fulltextMimetype application/pdf
Buy this publication >>

Authority records BETA

Frisk, Åsa M

Search in DiVA

By author/editor
Frisk, Åsa M
By organisation
Department of Earth Sciences
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 745 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1310 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf