Date of Award
Winter 12-15-2014
Degree Name
Doctor of Philosophy (PhD)
Degree Type
Dissertation
Abstract
The isotopic composition of the carbonate carbon (δ13Ccarb) is one of the best tools for understanding the biogeochemical carbon cycle through Earth history. δ13Ccarb is also used to chemostratigraphically correlate coeval strata. This dissertation has three main foci that all utilize δ13Ccarb as the common data type. The geologic interval investigated was the Late Ordovician (458-444 Ma) with emphasis on the Guttenberg δ13C excursion, a globally correlated, positive ~3 / event that is ~400 kyr in duration. In the first topic we evaluate post-depositional alteration (i.e., diagenesis) of δ13Ccarb signals. In the second topic, we make reconstructions of sea level change using lithostratigraphic and δ13Ccarb chemostratigraphic correlations. In the third topic, we use box models to constrain the source of the Guttenberg δ13Ccarb excursion.
Language
English (en)
Chair and Committee
David A Fike
Committee Members
Alexander S Bradley, Jeffrey G Catalano, Jill D Pasteris, Langhorne (Taury) B Smith
Recommended Citation
Metzger, John Garrecht, "The Late Ordovician Biogeochemical Carbon Cycle" (2014). Arts & Sciences Electronic Theses and Dissertations. 361.
https://openscholarship.wustl.edu/art_sci_etds/361
Comments
Permanent URL: https://doi.org/10.7936/K7CN722K