The archean atmosphere

DC Catling, KJ Zahnle - Science advances, 2020 - science.org
The atmosphere of the Archean eon—one-third of Earth's history—is important for
understanding the evolution of our planet and Earth-like exoplanets. New geological proxies …

Orogenic gold: Common or evolving fluid and metal sources through time

RJ Goldfarb, DI Groves - Lithos, 2015 - Elsevier
Orogenic gold deposits of all ages, from Paleoarchean to Tertiary, show consistency in
chemical composition. They are the products of aqueous-carbonic fluids, with typically 5–20 …

A re-assessment of elemental proxies for paleoredox analysis

TJ Algeo, J Liu - Chemical Geology, 2020 - Elsevier
Paleoredox conditions are commonly evaluated based on elemental proxies but, despite
their frequency of use, most of these proxies have received little comparative evaluation or …

A holistic model for the origin of orogenic gold deposits and its implications for exploration

DI Groves, M Santosh, J Deng, Q Wang, L Yang… - Mineralium …, 2020 - Springer
The term orogenic gold deposits has been widely accepted, but there has been continuing
debate on their genesis. Early syn-sedimentary or syn-volcanic models and hydrothermal …

Timing the evolution of antioxidant enzymes in cyanobacteria

JS Boden, KO Konhauser, LJ Robbins… - Nature …, 2021 - nature.com
The ancestors of cyanobacteria generated Earth's first biogenic molecular oxygen, but how
they dealt with oxidative stress remains unconstrained. Here we investigate when …

Trace element content of sedimentary pyrite in black shales

DD Gregory, RR Large, JA Halpin… - Economic …, 2015 - pubs.geoscienceworld.org
Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analyses of
1,407 sedimentary (diagenetic and syngenetic) pyrites from 45 carbonaceous shale and …

Oceanic oxygenation events in the anoxic Ediacaran ocean

SK Sahoo, NJ Planavsky, G Jiang, B Kendall… - …, 2016 - Wiley Online Library
The ocean‐atmosphere system is typically envisioned to have gone through a unidirectional
oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 …

The behavior of trace elements in seawater, sedimentary pore water, and their incorporation into carbonate minerals: a review

D Smrzka, J Zwicker, W Bach, D Feng, T Himmler… - Facies, 2019 - Springer
Trace elements are actively cycled in seawater, are essential components for marine life,
and are transported to the seafloor where they can become enriched in marine sediments …

Signatures of early microbial life from the Archean (4 to 2.5 Ga) eon

K Lepot - Earth-Science Reviews, 2020 - Elsevier
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 …

Geochemical and micro-textural fingerprints of boiling in pyrite

N Román, M Reich, M Leisen, D Morata, F Barra… - … et Cosmochimica Acta, 2019 - Elsevier
The chemical composition, textures and mineral associations of pyrite provide key
information that help elucidate the evolution of hydrothermal systems. However, linking the …