Results 71 to 80 of about 31,446 (282)

Estratigrafía del Grupo Mina Verdun, Proterozoico de Minas, Uruguay

Latin American Journal of Sedimentology and Basin Analysis
El objetivo del presente trabajo es el de presentar un cuadro estratigráfico para las sedimentitas del área del Cerro Verdún, Minas, Uruguay. Asimismo presentar algunas consideraciones sobre sus características sedimentológicas y sus estromatolitos, a ...
Daniel G. Poiré, Pablo D. González, José M. Canalicchio, Flavio García Repetto   +3 more
doaj  

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

Mo Isotopic Records Imply Persistent Ocean Oxygenation in the Deep Southwest Pacific During the Early Cenozoic Warming Period

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract During the early Cenozoic greenhouse period, counterintuitive contractions in tropical Pacific oxygen‐deficient zones have been linked to enhanced deep‐ocean ventilation, yet direct geological evidence remains limited. Here we present molybdenum (Mo) isotopic records from International Ocean Discovery Program Site U1509.
Xiaowen Liu, Xiaole Sun, Yi Huang, Weidong Sun, Yuchen Li, Yufei Hao, Sifan Wu, Le Li, Jing Huang   +8 more
wiley   +1 more source

Discussion of multiple formation mechanisms of saddle dolomites—Comparison of geochemical data of Proterozoic–Paleozoic dolomites

Energy Exploration & Exploitation, 2018
As important gas-bearing strata, Proterozoic–Paleozoic marine carbonate successions in the Sichuan Basin have experienced a long diagenetic history and multiphase hydrothermal activities.
Bo Peng, Guorong Li, Zongxing Li, Chenglin Liu, Yinhui Zuo, Wen Zhang, Li Yuan, Sha Zhao, Cheng Yao   +8 more
doaj   +1 more source

The Proterozoic Vazante Hypogene Zinc Silicate District, Minas Gerais, Brazil: A Review of the Ore System Applied to Mineral Exploration [PDF]

, 2018
Gema R. Olivo, Lena Virgínia Soares Monteiro, Fernando Costa Baia, Paul Slezak, Igor A.K. Carvalho, Neil A. Fernandes, Gustavo Diniz Oliveira, Basílio Botura Neto, Alexandra J. McGladrey, Adalene Moreira Silva, Márcia Abrahão Moura, Daniel Layton‐Matthews   +11 more
openalex   +1 more source

Characterization of Crustal Deformation During the May 2021 Nyiragongo Eruption Using InSAR and GNSS Data

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract We analyze Interferometric Synthetic Aperture Radar (InSAR) and Global Navigation Satellite System (GNSS) data to characterize ground deformation and dike opening associated with the May 2021 Nyiragongo eruption. Despite documented eruptions in 1977 and 2002, Nyiragongo's magmatic system and its interaction with regional rifting remain poorly ...
D. Murekezi, A. Newman, C. Wauthier, C. J. Ebinger, P. Lundgren, J. Gonzalez Santana, T. Niyitegeka, G. Nyandwi, T. Habiyakare, J. Uwiduhaye   +9 more
wiley   +1 more source

Arsenic stress after the Proterozoic glaciations

Scientific Reports, 2015
Protection against arsenic damage in organisms positioned deep in the tree of life points to early evolutionary sensitization. Here, marine sedimentary records reveal a Proterozoic arsenic concentration patterned to glacial-interglacial ages.
Ernest Chi Fru, Emma Arvestål, N. Callac, A. El Albani, S. Kilias, A. Argyraki, M. Jakobsson   +6 more
semanticscholar   +1 more source

A Seismically Active Shear Zone in the Uppermost Mantle Beneath the Canadian Rockies

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Continental mantle earthquakes are uncommon but hold important clues for understanding lithospheric rheology. Few of these earthquakes (<10) have been documented in western North America, though it is likely more exist owing to difficulties in resolving focal depth for small earthquakes.
Sean J. Hutchings, Keith D. Koper, Guanning Pang   +2 more
wiley   +1 more source

Proterozoic Lithospheric Evolution

Eos, Transactions American Geophysical Union, 1988
Recent years have seen significant new results on the evolution of Proterozoic terranes, and many of these resulted from new techniques, new concepts, and increasing multi‐disciplinary research. In 1981, Working Group (WG) 3 of the International Lithosphere Program (ILP) was established.
openaire   +1 more source

State‐Dependence of Polar Amplification in an Idealized GCM

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Polar amplification (PA) is a robust feature of contemporary climate change, but its state‐dependence across different climate conditions is poorly understood despite potential relevance to paleoclimate records and future projections. Here we examine the state‐dependence of PA across a wide range of climate states in an idealized moist general
Andrew I. L. Williams, Timothy M. Merlis
wiley   +1 more source