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Early Silurian positive δ13C excursions and their relationship to glaciations, sea-level changes and extinction events

✍ Scribed by David K. Loydell

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
196 KB
Volume
42
Category
Article
ISSN
0072-1050

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✦ Synopsis

Abstract

Evidence is presented from the upper Aeronian, lower Sheinwoodian and middle Homerian demonstrating that positive δ^13^C excursions in the lower Silurian are the result of increased carbonate weathering and probably also enhanced burial of organic carbon coincident with sea‐level falls resulting from growth of ice sheets on the South American part of Gondwana. Graptolite extinctions are coincident with the δ^13^C excursions, whereas major conodont extinction events (Ireviken and Mulde) are not, but conversely, occur at times of high sea level. This suggests very different controls on graptolite and conodont global diversity patterns. Palynological studies suggest that netromorph acritarchs may have been opportunists that flourished during positive δ^13^C excursion intervals. Copyright © 2007 John Wiley & Sons, Ltd.

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Early Silurian positive δ13C excursions
Early Silurian positive δ13C excursions and their relationship to glaciations, sea-level changes and extinction events: discussion
✍ Bradley D. Cramer; Axel Munnecke 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 67 KB

Loydell (2007) provides a welcomed review of some of the problems the Palaeozoic community is currently facing when attempting to interpret evidence of ancient climate change. We have, however, some points that we would like to discuss, especially with respect to his interpretation of stable isot

Reply to ‘Early Silurian positive δ13C e
Reply to ‘Early Silurian positive δ13C excursions and their relationship to glaciations, sea-level changes and extinction events: discussion’ by Bradley D. Cramer and Axel Munnecke
✍ David K. Loydell 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 83 KB

I am pleased that Cramer and Munnecke consider my paper to be 'welcome'. When my interest in carbon isotopes was sparked (by the excellent presentations at 'The Dynamic Silurian Earth' meeting on Gotland in 2005 and the IGCP 503 meeting in Glasgow in 2006), I was struck by the coincidence of the com