TIMING OF CARBON ISOTOPE EXCURSIONS DURING THE LATE TRIASSIC AND EARLY JURASSIC: NEW MODELING CONSTRAINTS FOR CARBON CYCLE PERTURBATIONS ASSOCIATED WITH THE EMPLACEMENT OF THE CENTRAL ATLANTIC MAGMATIC PROVINCE
We measured organic carbon isotopes at the section near Levanto, Peru, and use the temporal framework provided by recent high-resolution biostratigraphy and ash bed dating (Schaltegger et al., 2008; Schoene et al., 2010; Guex et al., 2012; Wotzlaw et al., 2014). An initial positive excursion can be identified immediately followed by a negative excursion coincident with the last occurrence of Triassic ammonites, then an extended positive isotope excursion that persists through the onset of Jurassic ammonite recovery. This record is compared to existing data sets from Tethys and Panthalassa to distinguish local vs global CAMP effects. We temporally constrain the isotope excursions, and are able to compare and contrast these durations with those from modeled results.