Date of Award
Doctor of Philosophy (PhD)
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.
Chair and Committee
David A Fike
Alexander S Bradley, Jeffrey G Catalano, Jill D Pasteris, Langhorne (Taury) B Smith
Metzger, John Garrecht, "The Late Ordovician Biogeochemical Carbon Cycle" (2014). Arts & Sciences Electronic Theses and Dissertations. 361.