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:
https://lup.lub.lu.se/record/312915
- author
- Jeppsson, Lennart
LU
and Calner, Mikael
LU
- organization
- publishing date
- 2003
- 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
- Cambridge University Press
- external identifiers
-
- wos:000182321100003
- scopus:0038304599
- 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
- 2016-04-01 15:25:49
- date last changed
- 2023-01-04 17:22:00
@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}},
keywords = {{Conodonta; glaciation; graptolites; stratigraphy; high-resolution; extinctions}},
language = {{eng}},
pages = {{135--154}},
publisher = {{Cambridge University Press}},
series = {{Transactions of the Royal Society of Edinburgh. Earth Sciences}},
title = {{The Silurian Mulde Event and a scenario for secundo-secundo events}},
url = {{http://www.ingentaconnect.com/content/rse/tes/2003/00000093/00000002/art00003}},
volume = {{93}},
year = {{2003}},
}