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Sedimentology of SPICE (Steptoean positive carbon isotope excursion): A high-resolution trace fossil and microfabric analysis of the middle to late Cambrian Alum Shale Formation, southern Sweden

Egenhoff, Sven O.; Fishman, Neil S.; Ahlberg, Per LU ; Maletz, Jörg; Jackson, Allison; Kolte, Ketki ; Lowers, Heather ; Mackie, James; Newby, Warren and Petrowsky, Matthew (2015) In Geological Society of America. Special Papers 515. p.87-102
Abstract
The Cambrian Alum Shale Formation in the Andrarum-3 core from Scania,
southern Sweden, consists of black siliciclastic mudstone with minor carbonate intercalations. Four facies comprise three siliciclastic mudstones and one fine-grained carbonate. The facies reflect deposition along a transect from deep ramp to basin on a Cambrian shelf. The three mudstone facies contain abundant clay clasts and laterally variable siltstone laminae. Bed-load transport processes seem to have dominated deposition on this deep shelf. These sedimentary rocks record mainly event deposition, and only relatively few, thin laminae probably resulted from suspension settling. The Alum Shale Formation deep shelf did not show a bioturbation gradient, but fecal... (More)
The Cambrian Alum Shale Formation in the Andrarum-3 core from Scania,
southern Sweden, consists of black siliciclastic mudstone with minor carbonate intercalations. Four facies comprise three siliciclastic mudstones and one fine-grained carbonate. The facies reflect deposition along a transect from deep ramp to basin on a Cambrian shelf. The three mudstone facies contain abundant clay clasts and laterally variable siltstone laminae. Bed-load transport processes seem to have dominated deposition on this deep shelf. These sedimentary rocks record mainly event deposition, and only relatively few, thin laminae probably resulted from suspension settling. The Alum Shale Formation deep shelf did not show a bioturbation gradient, but fecal strings are common and Planolites burrows are rare in all mudstone facies. Evidence for biotic colonization indicates that this mudstone environment was not persistently anoxic, but rather was most likely intermittently dysoxic. The Alum Shale Formation in the Andrarum-3 core shows an overall decrease of grain size, preserved energy indicators, and carbonate content upsection interpreted to reflect a deepening
upward. The succession can also be divided into four small-scale fining-upward
cycles that represent deepening, and four overlying coarsening-upward cycles that represent upward shallowing. (Less)
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Contribution to journal
publication status
published
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in
Geological Society of America. Special Papers
volume
515
pages
16 pages
publisher
Geological Society of America
external identifiers
  • scopus:84941795529
ISSN
0072-1077
DOI
10.1130/2015.2515(05)
language
English
LU publication?
yes
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f329e011-5e02-4e18-9a58-c3b6f7a0520e
date added to LUP
2017-02-19 22:09:06
date last changed
2017-10-22 05:26:49
@article{f329e011-5e02-4e18-9a58-c3b6f7a0520e,
  abstract     = {The Cambrian Alum Shale Formation in the Andrarum-3 core from Scania,<br/>southern Sweden, consists of black siliciclastic mudstone with minor carbonate intercalations. Four facies comprise three siliciclastic mudstones and one fine-grained carbonate. The facies reflect deposition along a transect from deep ramp to basin on a Cambrian shelf. The three mudstone facies contain abundant clay clasts and laterally variable siltstone laminae. Bed-load transport processes seem to have dominated deposition on this deep shelf. These sedimentary rocks record mainly event deposition, and only relatively few, thin laminae probably resulted from suspension settling. The Alum Shale Formation deep shelf did not show a bioturbation gradient, but fecal strings are common and Planolites burrows are rare in all mudstone facies. Evidence for biotic colonization indicates that this mudstone environment was not persistently anoxic, but rather was most likely intermittently dysoxic. The Alum Shale Formation in the Andrarum-3 core shows an overall decrease of grain size, preserved energy indicators, and carbonate content upsection interpreted to reflect a deepening<br/>upward. The succession can also be divided into four small-scale fining-upward<br/>cycles that represent deepening, and four overlying coarsening-upward cycles that represent upward shallowing.},
  author       = {Egenhoff, Sven O. and Fishman, Neil S. and Ahlberg, Per and Maletz, Jörg and  Jackson, Allison and Kolte, Ketki  and Lowers, Heather  and Mackie, James and  Newby, Warren and Petrowsky, Matthew},
  issn         = {0072-1077},
  language     = {eng},
  pages        = {87--102},
  publisher    = {Geological Society of America},
  series       = {Geological Society of America. Special Papers},
  title        = {Sedimentology of SPICE (Steptoean positive carbon isotope excursion): A high-resolution trace fossil and microfabric analysis of the middle to late Cambrian Alum Shale Formation, southern Sweden},
  url          = {http://dx.doi.org/10.1130/2015.2515(05)},
  volume       = {515},
  year         = {2015},
}