Iron formations (IF) represent an iron-rich rock type that typifies many Archaean and
Proterozoic supracrustal successions and are chemical archives of Precambrian seawater …

The mineralogy of terrestrial planets evolves as a consequence of a range of physical,
chemical, and biological processes. In pre-stellar molecular clouds, widely dispersed …

Iron formations are economically important sedimentary rocks that are most common in
Precambrian sedimentary successions. Although many aspects of their origin remain …

Construction and assembly of the Geologic Time Scale involves:(a) constructing a relative
(chronostratigraphic) standard scale for key periods in the Earth's rock record;(b) identifying …

Abstract The Archean era (4 to 2.5 billion years ago, Ga) yielded rocks that include the
oldest conclusive traces of life as well as many controversial occurrences. Carbonaceous …

The ocean and atmosphere were largely anoxic in the early Precambrian, resulting in an Fe
cycle that was dramatically different than today's. Extremely Fe-rich sedimentary deposits …

The evolution of oxygenic photosynthesis is a pivotal event in Earth's history because the O2
released fundamentally changed the planet's redox state and facilitated the emergence of …

The largest Fe isotope fractionations occur during redox changes, as well as differences in
bonding, but these are expressed only in natural environments in which significant …

Oxygenic photosynthesis is arguably the most important biological innovation in Earth's
history, facilitating the transition to a habitable planet for complex life. Dating the emergence …

Persistent anoxia and the lack of a skeletal silica sink through the Precambrian would have
promoted a variety of reactions between iron and dissolved silica through much of Earth's …