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The complexity of mudstone diagenesis–some insight from the Tøyen Shale, Lower to Middle Ordovician, southern Sweden

Egenhoff, Sven O.; Fishman, Neil S.; Lowers, Heather A. and Ahlberg, Per LU (2019) In GFF 141(1). p.54-67
Abstract

The Lower to Middle Ordovician Tøyen Shale in southern Sweden, a biostratigraphically well-dated siliciclastic mudstone unit, shows 18 distinct authigenic cements that include sulfides, carbonates, silicates, clays, and phosphates. Marcasite, sphalerite, galena, and six texturally distinct types of pyrite characterize the sulfides whereas only one type of dolomite and three different generations of calcite are observed in this unit. Quartz, phosphate, and organic matter occur as only one generation each. Authigenic clay minerals are represented by chlorite and kaolinite. The paragenetic sequence of cements is subdivided into the two pre-burial carbonates, succeeded by ten relatively early burial cements, and six late burial cements, the... (More)

The Lower to Middle Ordovician Tøyen Shale in southern Sweden, a biostratigraphically well-dated siliciclastic mudstone unit, shows 18 distinct authigenic cements that include sulfides, carbonates, silicates, clays, and phosphates. Marcasite, sphalerite, galena, and six texturally distinct types of pyrite characterize the sulfides whereas only one type of dolomite and three different generations of calcite are observed in this unit. Quartz, phosphate, and organic matter occur as only one generation each. Authigenic clay minerals are represented by chlorite and kaolinite. The paragenetic sequence of cements is subdivided into the two pre-burial carbonates, succeeded by ten relatively early burial cements, and six late burial cements, the kaolinite being the latest of them all and potentially being of Cretaceous age. Based on textural relationships, the paragenetic sequence of alterations started with dolomite precipitation followed by calcite, and then five different generations of pyrite. All eleven other phases post-date these initial seven cements in the Tøyen Shale.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dolomite formation, Lower to Middle Ordovician, Shale diagenesis, Tøyen Formation
in
GFF
volume
141
issue
1
pages
54 - 67
publisher
Taylor & Francis
external identifiers
  • scopus:85057874456
ISSN
1103-5897
DOI
10.1080/11035897.2018.1525620
language
English
LU publication?
yes
id
2ddc0b78-97f7-4941-99e6-756e9186aa01
date added to LUP
2018-12-20 14:55:41
date last changed
2019-05-27 18:50:45
@article{2ddc0b78-97f7-4941-99e6-756e9186aa01,
  abstract     = {<p>The Lower to Middle Ordovician Tøyen Shale in southern Sweden, a biostratigraphically well-dated siliciclastic mudstone unit, shows 18 distinct authigenic cements that include sulfides, carbonates, silicates, clays, and phosphates. Marcasite, sphalerite, galena, and six texturally distinct types of pyrite characterize the sulfides whereas only one type of dolomite and three different generations of calcite are observed in this unit. Quartz, phosphate, and organic matter occur as only one generation each. Authigenic clay minerals are represented by chlorite and kaolinite. The paragenetic sequence of cements is subdivided into the two pre-burial carbonates, succeeded by ten relatively early burial cements, and six late burial cements, the kaolinite being the latest of them all and potentially being of Cretaceous age. Based on textural relationships, the paragenetic sequence of alterations started with dolomite precipitation followed by calcite, and then five different generations of pyrite. All eleven other phases post-date these initial seven cements in the Tøyen Shale.</p>},
  author       = {Egenhoff, Sven O. and Fishman, Neil S. and Lowers, Heather A. and Ahlberg, Per},
  issn         = {1103-5897},
  keyword      = {dolomite formation,Lower to Middle Ordovician,Shale diagenesis,Tøyen Formation},
  language     = {eng},
  number       = {1},
  pages        = {54--67},
  publisher    = {Taylor & Francis},
  series       = {GFF},
  title        = {The complexity of mudstone diagenesis–some insight from the Tøyen Shale, Lower to Middle Ordovician, southern Sweden},
  url          = {http://dx.doi.org/10.1080/11035897.2018.1525620},
  volume       = {141},
  year         = {2019},
}