Kurt O Konhauser, Stefan V Lalonde, Noah J Planavsky, Ernesto Pecoits, Timothy W Lyons, Stephen J Mojzsis, Olivier J Rouxel, Mark E Barley, Carlos Rosìere, Phillip W Fralick, Lee R Kump, Andrey Bekker

2011/10/20

Nature

478

7369

369

Nature Publishing Group

Abstract The enrichment of redox-sensitive trace metals in ancient marine sedimentary rocks
has been used to determine the timing of the oxidation of the Earth's land surface. Chromium
(Cr) is among the emerging proxies for tracking the effects of atmospheric oxygenation on
continental weathering; this is because its supply to the oceans is dominated by terrestrial
processes that can be recorded in the Cr isotope composition of Precambrian iron
formations. However, the factors controlling past and present seawater Cr isotope ...