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The Silurian Mulde Event and a scenario for secundo-secundo events

Jeppsson, Lennart LU and Calner, Mikael LU (2003) In Transactions of the Royal Society of Edinburgh. Earth Sciences 93. p.135-154
Abstract
Graphic correlation using graptolites and conodonts provides a high-resolution timescale for correlating from coastal to deep oceanic sections and, thereby, also a detailed record of the sequence of changes during the Mulde Secundo-Secundo Event. That interval includes sedimentary facies otherwise unknown in older Wenlock to early Ludlow strata on Gotland. The identified sequence of changes includes a detailed record of, in order: two extinctions (Datum points 1 and 1-5); widespread deposition of carbon-rich sediments extensive enough to cause a delta(13)C increase of c. 4.8parts per thousand, the onset, maximum and end of a sea-level fall and rise of at least 16m during 30 kyr; a third extinction (Datum 2); a disaster fauna; and a slow... (More)
Graphic correlation using graptolites and conodonts provides a high-resolution timescale for correlating from coastal to deep oceanic sections and, thereby, also a detailed record of the sequence of changes during the Mulde Secundo-Secundo Event. That interval includes sedimentary facies otherwise unknown in older Wenlock to early Ludlow strata on Gotland. The identified sequence of changes includes a detailed record of, in order: two extinctions (Datum points 1 and 1-5); widespread deposition of carbon-rich sediments extensive enough to cause a delta(13)C increase of c. 4.8parts per thousand, the onset, maximum and end of a sea-level fall and rise of at least 16m during 30 kyr; a third extinction (Datum 2); a disaster fauna; and a slow faunal recovery. Thus, a secondary result of the event was a weakened greenhouse effect triggering a glaciation: the Gannarve Glaciation (new term). The order of changes proves that regression did not cause the extinctions. Faunal and sea-level changes, as well as the sedimentary succession, fit well with predictions based on an oceanic model. Extinctions were primarily caused by a severe drop in primary planktonic productivity, causing starvation among planktonic larvae in non-coastal settings. The Grotlingbo Bentonite (new term), the thickest in the Wenlock of Gotland, was deposited across the basin shortly after Datum 2. Temporal resolution is high enough to permit some comparison with Quaternary glaciations. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Conodonta, glaciation, graptolites, stratigraphy, high-resolution, extinctions
in
Transactions of the Royal Society of Edinburgh. Earth Sciences
volume
93
pages
135 - 154
publisher
Royal Society of Edinburgh
external identifiers
  • wos:000182321100003
ISSN
0263-5933
language
English
LU publication?
yes
id
82a9ba96-f355-4830-979b-05995cb3aa2b (old id 312915)
alternative location
http://www.ingentaconnect.com/content/rse/tes/2003/00000093/00000002/art00003
date added to LUP
2007-09-13 13:15:29
date last changed
2018-05-29 11:47:38
@article{82a9ba96-f355-4830-979b-05995cb3aa2b,
  abstract     = {Graphic correlation using graptolites and conodonts provides a high-resolution timescale for correlating from coastal to deep oceanic sections and, thereby, also a detailed record of the sequence of changes during the Mulde Secundo-Secundo Event. That interval includes sedimentary facies otherwise unknown in older Wenlock to early Ludlow strata on Gotland. The identified sequence of changes includes a detailed record of, in order: two extinctions (Datum points 1 and 1-5); widespread deposition of carbon-rich sediments extensive enough to cause a delta(13)C increase of c. 4.8parts per thousand, the onset, maximum and end of a sea-level fall and rise of at least 16m during 30 kyr; a third extinction (Datum 2); a disaster fauna; and a slow faunal recovery. Thus, a secondary result of the event was a weakened greenhouse effect triggering a glaciation: the Gannarve Glaciation (new term). The order of changes proves that regression did not cause the extinctions. Faunal and sea-level changes, as well as the sedimentary succession, fit well with predictions based on an oceanic model. Extinctions were primarily caused by a severe drop in primary planktonic productivity, causing starvation among planktonic larvae in non-coastal settings. The Grotlingbo Bentonite (new term), the thickest in the Wenlock of Gotland, was deposited across the basin shortly after Datum 2. Temporal resolution is high enough to permit some comparison with Quaternary glaciations.},
  author       = {Jeppsson, Lennart and Calner, Mikael},
  issn         = {0263-5933},
  keyword      = {Conodonta,glaciation,graptolites,stratigraphy,high-resolution,extinctions},
  language     = {eng},
  pages        = {135--154},
  publisher    = {Royal Society of Edinburgh},
  series       = {Transactions of the Royal Society of Edinburgh. Earth Sciences},
  title        = {The Silurian Mulde Event and a scenario for secundo-secundo events},
  volume       = {93},
  year         = {2003},
}