Although marine productivity is a key parameter in the global carbon cycle, reliable
estimation of productivity in ancient marine systems has proven difficult. In this study, we …

Euxinic ocean conditions accompanied significant events in Earth history, including several
Phanerozoic biotic crises. By critically examining modern and ancient euxinic environments …

This paper is a synthesis of the use of selected trace elements as proxies for reconstruction
of paleoproductivity and paleoredox conditions. Many of the trace elements considered here …

The Corg: P ratios of organic-rich facies (TOC> 1%) exhibit considerable variation through
the Phanerozoic, from< 10: 1 in the Permian Phosphoria Formation to> 1000: 1 in some …

The main controlling factors of organic matter accumulation in the Upper Ordovician Wufeng–
Lower Silurian Longmaxi Formations are complex and remain highly controversial. This …

The cycling of phosphorus, a biocritical element in short supply in nature, is an important
Earth system process. Variations in the phosphorus cycle have occurred in the past. For …

After the evolution of oxygen-producing cyanobacteria at some time before 2.7 billion years
ago, oxygen production on Earth is thought to have depended on the availability of nutrients …

The Wufeng organic-rich shale is widespread in the Upper Yangtze platform, and it is one of
the most advantageous shale gas producers in China. Its deposition commenced with the …

Phosphorus (P) is a limiting nutrient for terrestrial biological productivity that commonly plays
a key role in net carbon uptake in terrestrial ecosystems (Tiessen et al. 1984, Roberts et al …

In this study, redox-dependent phosphorus (P) recycling and burial at 6 sites in the Baltic
Sea is investigated using a combination of porewater and sediment analyses and sediment …