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U-Pb (zircon) age constraints on the timing and duration of Wen lock (Silurian) paleocommunity collapse and recovery during the "Big Crisis"

Cramer, Bradley D.; Condon, Daniel J.; Söderlund, Ulf LU ; Marshall, Carly; Worton, Graham J.; Thomas, Alan T.; Calner, Mikael LU ; Ray, David C.; Perrier, Vincent and Boomer, Ian, et al. (2012) In Geological Society of America Bulletin 124(11-12). p.1841-1857
Abstract
High-precision isotope-dilution U-Pb (zircon) dating was conducted on three volcanic ash fall (bentonite) samples from the Swedish island of Gotland, and on a fourth bentonite from the West Midlands, England. Zircons from the Ireviken, Grotlingbo, Djupvik (Gotland), and Wren's Nest Hill-15 (West Midlands) bentonites yielded weighted mean Pb-206/U-238 ages of 431.83 +/- 0.23/0.67 Ma, 428.45 +/- 035/0.73 Ma, 428.06 +/- 0.2110.66 Ma, and 427.86 +/- 032/0.71 Ma, respectively (analytical/total uncertainties). These biostratigraphically well-controlled age dates effectively bracket the Wenlock Epoch of the Silurian Period and provide control for the duration of one of the major Paleozoic biotic events and associated perturbations to the global... (More)
High-precision isotope-dilution U-Pb (zircon) dating was conducted on three volcanic ash fall (bentonite) samples from the Swedish island of Gotland, and on a fourth bentonite from the West Midlands, England. Zircons from the Ireviken, Grotlingbo, Djupvik (Gotland), and Wren's Nest Hill-15 (West Midlands) bentonites yielded weighted mean Pb-206/U-238 ages of 431.83 +/- 0.23/0.67 Ma, 428.45 +/- 035/0.73 Ma, 428.06 +/- 0.2110.66 Ma, and 427.86 +/- 032/0.71 Ma, respectively (analytical/total uncertainties). These biostratigraphically well-controlled age dates effectively bracket the Wenlock Epoch of the Silurian Period and provide control for the duration of one of the major Paleozoic biotic events and associated perturbations to the global carbon cycle (the "Big Crisis" or lundgreni event- graptolites; the NIulde Event-conodonts; the Mulde excursion-carbon isotopes). These new data suggest an older and shorter duration for the recalibration of the Wenlock Series and demonstrate that the cascade of biological and chemical events that took place during the Big Crisis happened on time scales of tens to hundreds of thousands of years. (Less)
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Geological Society of America Bulletin
volume
124
issue
11-12
pages
1841 - 1857
publisher
Geological Society of America
external identifiers
  • wos:000310410100012
  • scopus:84871147827
ISSN
0016-7606
DOI
10.1130/B30642.1
language
English
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yes
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155fca9d-65e4-4988-9318-9b5a8f508764 (old id 3244236)
date added to LUP
2012-12-27 12:50:10
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2017-11-19 03:41:26
@article{155fca9d-65e4-4988-9318-9b5a8f508764,
  abstract     = {High-precision isotope-dilution U-Pb (zircon) dating was conducted on three volcanic ash fall (bentonite) samples from the Swedish island of Gotland, and on a fourth bentonite from the West Midlands, England. Zircons from the Ireviken, Grotlingbo, Djupvik (Gotland), and Wren's Nest Hill-15 (West Midlands) bentonites yielded weighted mean Pb-206/U-238 ages of 431.83 +/- 0.23/0.67 Ma, 428.45 +/- 035/0.73 Ma, 428.06 +/- 0.2110.66 Ma, and 427.86 +/- 032/0.71 Ma, respectively (analytical/total uncertainties). These biostratigraphically well-controlled age dates effectively bracket the Wenlock Epoch of the Silurian Period and provide control for the duration of one of the major Paleozoic biotic events and associated perturbations to the global carbon cycle (the "Big Crisis" or lundgreni event- graptolites; the NIulde Event-conodonts; the Mulde excursion-carbon isotopes). These new data suggest an older and shorter duration for the recalibration of the Wenlock Series and demonstrate that the cascade of biological and chemical events that took place during the Big Crisis happened on time scales of tens to hundreds of thousands of years.},
  author       = {Cramer, Bradley D. and Condon, Daniel J. and Söderlund, Ulf and Marshall, Carly and Worton, Graham J. and Thomas, Alan T. and Calner, Mikael and Ray, David C. and Perrier, Vincent and Boomer, Ian and Patchett, P. Jonathan and Jeppsson, Lennart},
  issn         = {0016-7606},
  language     = {eng},
  number       = {11-12},
  pages        = {1841--1857},
  publisher    = {Geological Society of America},
  series       = {Geological Society of America Bulletin},
  title        = {U-Pb (zircon) age constraints on the timing and duration of Wen lock (Silurian) paleocommunity collapse and recovery during the "Big Crisis"},
  url          = {http://dx.doi.org/10.1130/B30642.1},
  volume       = {124},
  year         = {2012},
}