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Sedimentology of the Lower Ordovician (upper Tremadocian) Bjørkåsholmen Formation at Flagabro, southern Sweden

Egenhoff, Sven; Maletz, Jörg LU ; Ahlberg, Per LU ; Mast, Allison; Frisk, Åsa M.; Ebbestad, Jan Ove R. and Newby, Warren (2018) In GFF 140(1). p.55-65
Abstract

The Lower Ordovician Bjørkåsholmen Formation at Flagabro, Scania, southern Sweden, consists of a 0.8 m thick succession of carbonates with three siliciclastic mudstones, 5, 1 and 100 mm thick, intercalated in the central part of the unit. Carbonate and siliciclastic mudstone beds show both normal and inverse grading. The carbonates are mud-rich and subdivided into a mudstone, a wackestone and a packstone facies. Grain types in the carbonates are mostly shells and shell fragments of brachiopods and trilobites. The carbonate rocks are strongly bioturbated seen as in roundish burrows filled with mud and a clear cement; additionally, bioturbation is reflected in the random orientation of shells. The siliciclastic mudstones are subdivided... (More)

The Lower Ordovician Bjørkåsholmen Formation at Flagabro, Scania, southern Sweden, consists of a 0.8 m thick succession of carbonates with three siliciclastic mudstones, 5, 1 and 100 mm thick, intercalated in the central part of the unit. Carbonate and siliciclastic mudstone beds show both normal and inverse grading. The carbonates are mud-rich and subdivided into a mudstone, a wackestone and a packstone facies. Grain types in the carbonates are mostly shells and shell fragments of brachiopods and trilobites. The carbonate rocks are strongly bioturbated seen as in roundish burrows filled with mud and a clear cement; additionally, bioturbation is reflected in the random orientation of shells. The siliciclastic mudstones are subdivided into two facies; one contains large amounts of shells and is in part grain-supported, the other is matrix-dominated and laminated to massive. The succession reflects sedimentation on a low-inclined shelf equivalent to a mid-ramp to basinal setting. Most mud- and wackestones (facies 3 and 4) represent fair-weather sedimentation, and the intercalated wacke- and packstones (facies 4 and 5) represent concentration of shell debris during high-energy storm. The siliciclastic mudstones in the central part of the succession reflect deposition in a basinal setting. The entire Bjørkåsholmen Formation at Flagabro is equivalent to a lowstand of third (?) order without a well-developed internal cyclicity and is in that respect similar to the Bjørkåsholmen Formation of Öland, but different from the age-equivalent Norwegian sections.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bjørkåsholmen Formation, carbonates, Flagabro, siliciclastic mudstones
in
GFF
volume
140
issue
1
pages
11 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85046895727
ISSN
1103-5897
DOI
10.1080/11035897.2018.1445777
language
English
LU publication?
yes
id
4c20a294-7f88-4a78-b55a-533c4fd79c6d
date added to LUP
2018-05-25 12:52:29
date last changed
2019-02-20 11:18:08
@article{4c20a294-7f88-4a78-b55a-533c4fd79c6d,
  abstract     = {<p>The Lower Ordovician Bjørkåsholmen Formation at Flagabro, Scania, southern Sweden, consists of a 0.8 m thick succession of carbonates with three siliciclastic mudstones, 5, 1 and 100 mm thick, intercalated in the central part of the unit. Carbonate and siliciclastic mudstone beds show both normal and inverse grading. The carbonates are mud-rich and subdivided into a mudstone, a wackestone and a packstone facies. Grain types in the carbonates are mostly shells and shell fragments of brachiopods and trilobites. The carbonate rocks are strongly bioturbated seen as in roundish burrows filled with mud and a clear cement; additionally, bioturbation is reflected in the random orientation of shells. The siliciclastic mudstones are subdivided into two facies; one contains large amounts of shells and is in part grain-supported, the other is matrix-dominated and laminated to massive. The succession reflects sedimentation on a low-inclined shelf equivalent to a mid-ramp to basinal setting. Most mud- and wackestones (facies 3 and 4) represent fair-weather sedimentation, and the intercalated wacke- and packstones (facies 4 and 5) represent concentration of shell debris during high-energy storm. The siliciclastic mudstones in the central part of the succession reflect deposition in a basinal setting. The entire Bjørkåsholmen Formation at Flagabro is equivalent to a lowstand of third (?) order without a well-developed internal cyclicity and is in that respect similar to the Bjørkåsholmen Formation of Öland, but different from the age-equivalent Norwegian sections.</p>},
  author       = {Egenhoff, Sven and Maletz, Jörg and Ahlberg, Per and Mast, Allison and Frisk, Åsa M. and Ebbestad, Jan Ove R. and Newby, Warren},
  issn         = {1103-5897},
  keyword      = {Bjørkåsholmen Formation,carbonates,Flagabro,siliciclastic mudstones},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {55--65},
  publisher    = {Taylor & Francis},
  series       = {GFF},
  title        = {Sedimentology of the Lower Ordovician (upper Tremadocian) Bjørkåsholmen Formation at Flagabro, southern Sweden},
  url          = {http://dx.doi.org/10.1080/11035897.2018.1445777},
  volume       = {140},
  year         = {2018},
}