Results 61 to 70 of about 2,703 (191)

Assessing the Vulnerability of an Inuit Archaeological Site in a Changing Periglacial Environment: A Novel Multimethod Geophysical Approach in Arctic Geoarchaeology

Archaeometry, Volume 68, Issue 4, Page 620-632, August 2026.
ABSTRACT With northern regions warming at twice the global rate, assessing the state of archaeological sites in these areas is critically important. In this study, we used a multimethod geophysical approach (ERT, GPR, and EMI) to characterize the current geocryological conditions of an Inuit archaeological site on South Aulatsivik Island (Labrador ...
Rachel Labrie, Dominique Todisco, Najat Bhiry, Cécile Finco, Héloïg Barbel Le Page, Armelle Couillet   +5 more
wiley   +1 more source

On peculiarities of composition and properties of ancient hydrocarbon source rocks

Записки Горного института
Precambrian rocks are widespread within all continents of the Earth; that said, sedimentary associations of these deposits are of special interest in search for oil and gas fields.
Mariya A. Bolshakova, Kseniya A. Sitar, Dmitrii D. Kozhanov   +2 more
doaj  

Geological and isotope-geochemical criteria of evident presence of ancient continental crust in Primorye basement

Литосфера, 2018
The totality of structural-tectonic, lithologic-mineralogical, isotope-geochemical data on the geology of Primorye and adjacent territories of Northeast China and the Amur Region allows us to justify the criterions for the existence of an ancient sialic ...
Sergei O. Maksimov, Petr L. Nevolin, Vladimir I. Kiselev   +2 more
doaj   +1 more source

Paleomagnetic Constraints on the Separation of the Olongbuluke Block From the North China Block During the Late Cambrian–Middle Ordovician and Its Tectonic Significance

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The collisional evolution of the micro‐blocks in the northeastern Tibetan Plateau is relatively well constrained. However, the reason why a fragment of the North China Block, the Olongbuluke Block, became separated from North China by the Central Qilian Block (a fragment of the South China Block) remains unclear.
Teng Wang, Yanan Zhou, Ruiyang Chai, Xin Cheng, Hanning Wu   +4 more
wiley   +1 more source

Dark Land Surfaces Allow for Refugia That Could Support Photosynthetic Life on the Surface of Snowball Earth

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 13, 16 July 2026.
Abstract Photosynthetic eukaryotic algae survived the Neoproterozoic Snowball Earth events, indicating that liquid‐water refugia existed somewhere on the surface. We examine the potential for refugia at the coldest time of a snowball event, before CO2 had risen and with high‐albedo ice on the frozen ocean, before it became darkened by dust deposition ...
Greta E. M. Shum, Marysa M. Laguë, Abigail L. S. Swann, Cecilia M. Bitz, Edwin D. Waddington, Stephen G. Warren   +5 more
wiley   +1 more source

Geochronology of sillimanite-cordierite gneiss Atamanovo series of the South Yenisei Ridge (Russia)

Литосфера, 2017
The paper provides justification of Paleo Archaean age (3221 ± 15 Ma) of the granulite plutonic metamorphism that formed the Kan metamorphic complex of the Archaean crust in the Angara-Kan block of the Siberian craton. The age was defined on the basis of
A. M. Sazonov, K. A. Zablotsky, U. . Linnemann, E. A. Zvyagina, N. A. Nekrasova, E. A. Naumov, S. A. Sil′yanov   +6 more
doaj   +2 more sources

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  

Paleosecular Variation Constraints on Geomagnetic Field Morphology at ca. 1100 Ma

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Paleosecular variation provides a statistical test of long‐term geomagnetic field morphology, but its behavior across Precambrian polarity regimes remains poorly constrained. We compile a virtual geomagnetic pole dispersion data set spanning 1130–1070 Ma and apply nonlinear Model G fitting to evaluate field structure across the interval ...
Hanqing Zhao, Shihong Zhang, Jikai Ding, Qiang Ren, Haiyan Li, Weiwei Bian, Tianshui Yang, Huaichun Wu   +7 more
wiley   +1 more source

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

Proglacial lake records of Holocene glacier behaviour and catchment processes in Slettedalen, Northeast Greenland

Journal of Quaternary Science, Volume 41, Issue 5, Page 784-802, July 2026.
ABSTRACT Constraining Arctic catchment response to Holocene climate change is vital for understanding future environments. We present detailed sedimentological, geochemical and grain size end‐member analysis of two Holocene (~7.0 ka to present) lake sequences, S1 and S2, close to Zackenberg, Northeast Greenland.
Kathryn Adamson, Matt Carney, Stamatia Galata, Tom Bishop, Timothy Lane, Vikas Mackevicius, Rochelle Taylor   +6 more
wiley   +1 more source