Carbon isotope composition of graptolite periderm and whole-rock from the Aeronian (Silurian, Llandovery) in Wales and Scotland and its use in chemostratigraphy

Snelling, A.M. and Leng, M.J. and Zalasiewicz, J.A. and Kendrick, C.C. and Page, A. A. (2010) Carbon isotope composition of graptolite periderm and whole-rock from the Aeronian (Silurian, Llandovery) in Wales and Scotland and its use in chemostratigraphy. Proceedings of the Geologists' Association, 122 (1). pp. 82-91. DOI 10.1016/j.pgeola.2010.10.004

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Abstract

Here we show the use of graptolite periderm for chemostratigraphic study. Using material from the Aeronian (Silurian) interval from Wales and Scotland as examples, we show that the carbon isotope composition of the periderm (δ13Cgrap.) provides a signal that is locally different but not consistently so from surrounding whole-rock samples (δ13Cwhole-rock). Graptolite periderm δ13C seems not influenced by astogenetic stage of development or gross rhabdosome type and differences between δ13Cgrap. from different metamorphic grades are minimal. Taken as a whole, the Aeronian interval examined shows little overall change, but large variations are seen on the small scale, possibly reflecting very local carbon cycling. For carbon isotope stratigraphy in such rocks, therefore, large-scale bulk sampling will likely reduce inhomogeneities and give more reproducible results. Furthermore, in situations (for instance associated with sea level fluctuations) where terrestrial organic matter has been incorporated into the sediment, then graptolite carbon may more faithfully reflect bulk marine organic matter. © 2010 The Geologists' Association.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA60;
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: Proceedings of the Geologists' Association
Volume: 122
Page Range: pp. 82-91
Identification Number: 10.1016/j.pgeola.2010.10.004
Depositing User: Sarah Humbert
Date Deposited: 12 Mar 2011 11:36
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2028

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