Professor CHEN Daizhao and his team present high-resolution sulphur isotopic pairs of CAS and pyrite sulphide and relevant isotopic differences in identical carbonate samples for this interval to improve understanding of oceanic sulphur cycling and palaeoceanographic changes during the Late Devonian F–F transition.

Based on these data, they present a new discussion on palaeoceanographic changes and cross-oceanic sulphur cycling and possible impacts on the severe biotic crisis during the F–F transition.

Fig.1. Pyrite content and multiple isotopic (S–C–Sr) variations across the F–F boundary at Fuhe, South China. (Image by CHEN)

Fig. 2. Pyrite content and multiple isotopic (S–C) variations across the F–F boundary at Kowala, Poland. (Image by CHEN)

Fig. 3. Conceptual models of episodic oceanic changes (left) and sulphur cycling (right) during the F–F transition. (Image by CHEN)

Chen et al. Large sulphur isotopic perturbations and oceanic changes during the Frasnian-Famennian transition of the Late Devonian. Journal of the Geological Society, 2013, 170: 465-476(Download Here)