The Bi'r Umq suture zone (BUSZ) in western Saudi Arabia comprises Neoproterozoic oceanic-arc plutonic, volcanosedimentary, and ophiolitic rocks that record some of the earliest magmatic and tectonic events of the East African Orogen in the Arabian–Nubian Shield (ANS). New Nd isotopic analyses are combined with data on zircon inheritance and published isotopic studies to establish the case that ...

Abstract A zircon Hf isotope data set from Archean and Paleoproterozoic magmatic metasedimentary rocks of the southern São Francisco craton (Brazil) is interpreted as evidence accretionary collisional plate tectonics since at least Archean-Proterozoic boundary. During Phanerozoic, orogenies are considered end members different tectonic settings, both involving preexisting stable continental lit...

The Archean-Proterozoic transition marks a time of fundamental geologic, biologic, and atmospheric changes to the Earth system, including oxygenation atmosphere (termed Great Oxygenation Event; GOE), emergence continents above sea level. impacts GOE on Earth’s surface environment are imprinted geologic record, disappearance mass-independent fractionation sulfur isotopes (S-MIF). Temporally over...

Abstract Sedimentary rock deposits provide the best records of (bio)geochemical cycles in ancient ocean. Studies these sedimentary archives show that greenalite, an Fe(II) silicate with low levels Fe(III), was early chemical precipitate from Archean To better understand formation we explored controls on iron precipitation through experiments simulated seawater under exclusively ferrous conditio...

The nature of Archean life remains one the most contested topics in study Earth history. debate may be formulated as follows: When did present day metabolisms emerge to ecological significance? What limited productivity early biospheres? How existence and individual affect chemistry oxidation state ocean-atmosphere? In a new study, Ingalls et al. (2022, https://doi.org/10.1029/2022GL098100) app...

The probable sources of some of the famous Indian diamonds are the 1.2 Ga old Krishna lamproites of Southern India, a rare Proterozoic occurrence of lamproites which are usually Cretaceous or younger in age. In this study we report Nd, Sr, Pb and Hf isotopes and multiple trace element concentrations of the Krishna lamproites. The goals are to evaluate mantle-processes and the petrogenesis of th...

The great oxygenation event (GOE), the first of two major rises in atmospheric oxygen Earth history, was initially placed near Archean-Proterozoic boundary (∼2500 Ma). More recently, position GOE has been moved to between 2500 and 2300 Ma so as coincide with loss MIF sulfur isotope signal due creation Earth's ozone layer at that time. Here we present a revised interpretation history Archean Pro...