Local overprints on the global carbonate δ13C signal in Devonian–Carboniferous boundary successions of South China

The TICE event: Perturbation of carbon–nitrogen cycles during the mid-Tournaisian (Early Carboniferous) greenhouse–icehouse transition

“…Given that the study intervals represent relatively limited stratal thicknesses (105 and 70 m, respectively), differential thermal maturity within a given section is unlikely to have had any influence on its C-and N-isotopic compositions, e.g., through preferential deamination of the light isotope of nitrogen ( 14 N) (Bebout and Fogel, 1992). Petrofacies analysis of the study sections demonstrates no evidence of metamorphism (Qie et al, 2015). In the Malanbian section, a weak positive correlation between δ 15 N and C org /N ratios (Fig.…”

Petrophysical and geochemical signature of the Hangenberg Events: an integrated stratigraphy of the Devonian-Carboniferous boundary interval in the Northern Rhenish Massif (Avalonia, Germany)

“…The first "pre-event" phase is the regressive Drewer Sandstone Event (Bless et al 1993;Becker 1996: holostratigraphic level 8; recognized by fine siliciclastic deposition, increasing condensation, shallowing upwards, or by stratigraphic gaps just before the second phase -the Hangenberg Black Shale Event (HBSE; Hangenberg Event s.s.), which is manifested by globally widespread black shale deposition, carbon isotopic anomaly and mass extinction (e.g. , Walliser 1984;Becker 1993aBecker , 1993bBecker , 1996: holostratigraphic level 9; Caplan & Bustin 1999; Kaiser et al 2006Kaiser et al , 2008Qie et al 2015). This event was interpreted as a consequence of the upwelling of nutrient-rich waters, which led to eutrophication on shelves.…”

Latest Devonian to earliest Carboniferous conodont and carbon isotope stratigraphy of a shallow‐water sequence in South China

“…On the Qiangui Platform, the Hangenberg extinction horizon coincides with the disappearance of the rugose coral Cystophrentis at the top of the Gelaohe Formation (Qie et al ., ). Based on the current definition, the DCB is apparently located within the Cystophrentis–Uralinia interval Zone.…”

“…Correlation of the δ 13 C carb profiles from the USA (Saltzman, ; Cramer et al ., ), Belgium (Buggisch et al ., ) and South China (Qie et al ., ; Qie et al ., ; this study). Numerical ages and regional scales are after Waters et al .…”

“…At Qilinzhai, the abrupt extinction of Devonian‐type shallow‐water biota (Hangenberg Extinction Event) occurred at the uppermost part of the Gelaohe Formation and is consistent with the lithological boundary between the Gelaohe and Tangbagou formations (Zhang et al ., ; Qie et al ., ). No rugose corals and foraminifers were recovered from the overlying Unit A of the Tangbagou Formation.…”