The long history of life on Earth has unfolded as a cause-and-effect relationship with the
evolving amount of oxygen (O2) in the oceans and atmosphere. Oxygen deficiency …

Abstract The Proterozoic Eon spans Earth's middle age during which many important
transitions occurred. These transitions include the oxygenation of the atmosphere …

The first samples collected by the Mars 2020 mission represent units exposed on the Jezero
Crater floor, from the potentially oldest Séítah formation outcrops to the potentially youngest …

The early to mid-Paleoproterozoic Lomagundi-Jatuli Excursion (LJE) is ostensibly the
largest magnitude (approximately+ 5 to+ 30‰), longest duration (ca. 130–250 million years) …

Although Ce anomalies are commonly used to reconstruct past seawater redox conditions,
published interpretations are based on various proxy materials and analytical approaches …

Oceanic sulfate concentrations are widely thought to have reached millimolar levels during
the Proterozoic Eon, 2.5 to 0.54 billion years ago. Yet the magnitude of the increase in …

Abstract The Great Oxygenation Event (GOE), ca. 2.4 billion years ago, transformed life and
environments on Earth. Its causes, however, are debated. We mathematically analyze the …

It has been hypothesized that the overall size of—or efficiency of carbon export from—the
biosphere decreased at the end of the Great Oxidation Event (GOE)(ca. 2,400 to 2,050 Ma) …

Variations in atmosphere oxygen and ocean sulfate concentrations through time are
regarded as important controls on the cycles of sediment-hosted and volcanic-hosted ore …

Most known porphyry Cu deposits formed in the Phanerozoic and are exclusively associated
with moderately oxidized, sulfur-rich, hydrous arc-related magmas derived from partial …