Results 91 to 100 of about 9,495 (248)

The Detectability of CH4/CO2/CO and N2O Biosignatures Through Reflection Spectroscopy of Terrestrial Exoplanets

The Astronomical Journal
The chemical makeup of Earth’s atmosphere during the Archean (4–2.5 Ga) and Proterozoic eon (2.5–0.5 Ga) contrast considerably with the present-day: the Archean was rich in carbon dioxide and methane, and the Proterozoic had potentially higher amounts of
Armen Tokadjian, Renyu Hu, Mario Damiano
doaj   +1 more source

Multi‐Scale Electrical Conductivity Model of the Contiguous United States

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract The completion of the Magnetotelluric (MT) USArray across the contiguous US enables continental‐scale 3‐D imaging of the asthenosphere‐lithosphere electrical structure. We present a novel 3‐D model of the contiguous United States (MECMUS), derived from a single inversion of the now‐completed USMTArray data set.
Federico D. Munch, Alexander Grayver
wiley   +1 more source

Secular Changes in the Occurrence of Subduction During the Archean

Geophysical Research Letters
Subduction processes play a pivotal role in facilitating material exchange between the crust and mantle, contributing to the growth of continents. However, the onset and evolution of subduction remain hotly debated.
Chun‐Tao Liu, Chen‐Yang Ye, J. ZhangZhou   +2 more
doaj   +1 more source

Quantitative study on vertical distribution of heat flow in Niutuozhen geothermal field, Xiong'an New Area—Evidence from heat flow determination in the Archean of D01 well

Journal of Groundwater Science and Engineering
The karst geothermal reservoir in Xiong'an New Area is a representative example of an ancient buried hill geothermal system. However, published heat flow data are predominantly derived from the Cenozoic sedimentary cap.
Ya-hui Yao, Xiao-feng Jia, Sheng-tao Li, Jun-yan Cui, Hong Xiang, Dong-dong Yue, Qiu-xia Zhang, Zhao-long Feng   +7 more
doaj   +1 more source

Geochronology of the unexposed crust within the Finnish Archean – insights from the Koillismaa Deep Hole in Kuusamo, northeastern Finland

, 2022
Matti Kurhila, Teemu Anttilainen, Tuomo Karinen, Perttu Mikkola   +3 more
openalex   +1 more source

Data‐Driven Investigation Reveals Subaerial Proportion of Basalts Since the Early Archean

Geophysical Research Letters
The subaerial exposure of the modern continental crust through time remains intensely debated, with estimates of the first exposure ranging from the late Archean to the Neoproterozoic.
Chun‐Tao Liu, Xiao‐Ming Liu, J. ZhangZhou   +2 more
doaj   +1 more source

Was H2O2 generated before oxygenic photosynthesis?

Redox Biology
We obviously agree with Wu et al. that H2O2 might accumulate in the Archean land waters devoid of Fe2+. We do disagree on the topic of the half-life of H2O2, as the work cited in support for a longer half-live is not relevant to the conditions in the ...
Willem H. Koppenol, Helmut Sies
doaj   +1 more source

Geochemistry and petrogenesis of Archean mafic and ultramafic rocks, Southern West Greenland

, 2006
Frances E. Jenner
openalex   +1 more source

Giant lithium-rich pegmatites in Archean cratons form by remelting refertilised roots of greenstone belts

Communications Earth & Environment
Around 80% of the world’s hard-rock lithium supply comes from pegmatites formed in the Archean Eon, yet our understanding of how Lithium-pegmatites form assumes magma source compositions not relevant to those Archean cratons hosting most of the giant ...
Robert H. Smithies, Yongjun Lu, David C. Champion, Marcus T. Sweetapple, Jack R. Lowrey, Nathan H. Bowman, Kevin F. Cassidy, Tim J. Ivanic, Anthony I. S. Kemp, Rose E. Turnbull, Klaus Gessner, Fawna J. Korhonen   +11 more
doaj   +1 more source

Geological Evidence for the Operation of Plate Tectonics throughout the Archean: Records from Archean Paleo-Plate Boundaries [PDF]

, 2018
Timothy Kusky, Brian F. Windley, Ali Polat   +2 more
openalex   +1 more source