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Dynamic interplay of biogeochemical C, S and Ba cycles in response to the Shuram oxygenation event Vrije Universiteit Brussel

Huan Cui, Alan J. Kaufman, Shuhai Xiao, Chuanming Zhou, Maoyan Zhu, Mengchun Cao, Sean Loyd, Peter Crockford, Xiao-Ming Liu, Steven Goderis, et al.

Compared with Phanerozoic strata, sulfate minerals are relatively rare in the Precambrian record; this is probably due to the lower concentrations of sulfate in dominantly anoxic oceans. Here, we present a compilation of sulfate minerals that are stratigraphically associated with the Ediacaran Shuram excursion (SE) – the largest negative δ13C excursion in Earth history. We evaluated 15 SE sections, all of which reveal the presence of sulfate ...

On a class of translation-invariant spaces of quasianalytic ultradistributions Universiteit Gent

Pavel Dimovski, Bojan Prangoski, Jasson Vindas Diaz
A class of translation-invariant Banach spaces of quasianalytic ultradistributions is introduced and studied. They are Banach modules over a Beurling algebra. Based on this class of Banach spaces, we define corresponding test function spaces $\mathcal{D}^*_E$ and their strong duals $\mathcal{D}'^*_{E'_{\ast}}$ of quasianalytic type, and study convolution and multiplicative products on $\mathcal{D}'^*_{E'_{\ast}}$. These new spaces generalize ...