Organic-matter-rich shales are the main target rocks for unconventional oil and gas
exploration and development across the world. In China, shale-gas geological resources …

The oxygen content of the Earth's surface environment is thought to have increased in two
broad steps: the Great Oxygenation Event (GOE) around the Archean–Proterozoic boundary …

Existing redox classifications and the calibrations of elemental proxies to modern
environmental redox scales are in need of re-evaluation. Here, we review environmental …

Oceanic anoxia—including euxinic settings defined by the presence of water column
hydrogen sulfide (H2S)—is minor in the ocean today. Such conditions, however, were …

The reconstruction of oceanic paleoredox conditions on Earth is essential for investigating
links between biospheric oxygenation and major periods of biological innovation and …

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

Water plays a critical role in erosion and sediment transport and this relationship is most
evident in the hyperarid Atacama Desert of Northern Chile, a region characterized by …

Geochemical proxies based on Fe abundance (Fe/Al) and Fe-speciation have been widely
applied to marine sediments in order to unravel paleo-depositional redox conditions though …

Fluctuating climate is a hallmark of Earth. As one transcends deep into Earth time, however,
both the evidence for and the causes of climate change become difficult to establish. We …

Volcanism is a dominant natural source of mercury (Hg) to the atmosphere, biosphere,
ocean and sediments. In recent years, sedimentary Hg contents have emerged as a tool to …