Applying carbon-isotope stratigraphy using well cuttings for high-resolution chemostratigraphic correlation of the subsurface

Carbon cycling across the southern margin of Laurentia during the Late Ordovician

“…Therefore, increasing δ 13 C carb and δ 13 C org values at Tidwell Hollow and Red Mountain Expressway, in agreement with results from previous studies (e.g. Saltzman and Young, 2005;Ainsaar et al, 2010;Metzger et al, 2014;Bergström et al, 2015), could reflect a steady 13 C enrichment of the global surficial carbon reservoir prior to the GICE.…”

“…Agreement between trends in Alabama and previous records of North American and European carbon isotope stratigraphy (e.g. Saltzman and Young, 2005;Ainsaar et al, 2010;Metzger et al, 2014;Bergström et al, 2015) strengths arguments that increasing δ 13 C values is a global phenomenon. These results are consistent with a drawdown of atmospheric CO 2 prior to the GICE assuming net burial of organic carbon drove the excursion (Ainsaar et al, 2004;Saltzman and Young, 2005;Young et al, 2008).…”

“…Stratigraphic incompleteness has been previously invoked to explain variation in the expression of GICE across Laurentia (e.g. Metzger et al, 2014;Sell et al, 2015) and idea that depositional hiatuses are present in the study region is not unfounded. The Deicke and Millbrig K-bentonites are associated with erosional and/or omission surfaces (Haynes, 1994;Kolata et al, 1998), the Chickamauga Limestone is unconformably overlain by the Sequatchie Formation at Red Mountain Expressway, and we argue for the presence of unconformities at the Tidwell Hollow and Gadsden sections.…”

“…It has been documented in carbonates from North America, Europe, and Asia (Patzkowsky et al, 1997;Ludvigson et al, 2000;Ainsaar et al, 2004;Kaljo et al, 2004;Ludvigson et al, 2004;Saltzman and Young, 2005;Young et al, 2005;Bergström et al, 2008;Young et al, 2008;Bergström et al, 2010;Buggisch et al, 2010;Metzger and Fike, 2013;Pancost et al, 2013;Metzger et al, 2014). The excursion has been proposed to represent a perturbation in the global carbon cycle causally related to the onset of Late Ordovician cooling culminating in the Hirnantian glaciation (Ainsaar et al, 2004;Saltzman and Young, 2005;Young et al, 2008;2010).…”

Positive carbon isotope excursions: global correlation and genesis in the Middle–Upper Ordovician in the northern Tarim Basin, Northwest China

“…Compared with d 13 C carb , d 18 O carb is more susceptible to the influence of diagenesis (Gradstein et al 2012;Metzger et al 2014 (Sial et al 2013). It is indicated that the d 13 C carb and d…”