Results 61 to 70 of about 354 (177)

Lithosphere-asthenosphere system in shield areas of North America and Europe

Annals of Geophysics, 1997
In previous papers surface dispersion data have been combined with the results of deep seismic refraction data to derive a regionalization of the lithosphere-asthenosphere system and to investigate the presence of significant heterogeneity down to depths
P. Pierri, V. Del Gaudio, G. Calcagnile
doaj   +1 more source

Microbialite Niches Across the Archean and Paleoproterozoic

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract Changes in microbialite abundance during the Archean and Paleoproterozoic have been attributed to a variety of environmental and biological factors, yet past work looking at large‐scale patterns of microbialite abundance generally assumes shallow marine deposition rather than incorporating specific settings.
C. M. Howard, N. D. Sheldon
wiley   +1 more source

Ice‐Rafted Detritus of the Southeast Grand Banks Slope, Newfoundland, Throughout Heinrich Layers 1 to 5a: 2. Magnetic Properties

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Ocean‐wide “Heinrich event” layers marked by weakly magnetic dolomitic ice‐rafted detritus (IRD) from the Hudson Bay region are a prominent signature of Laurentide Ice Sheet surges. Contrary to intuition, the Heinrich layers of the Ruddiman Belt IRD exhibit maxima of magnetic susceptibility. Building on IRD petrology and abundance in sediments
S. Bukar, T. von Dobeneck, Y. Wang, L. Max, T. Frederichs, E. Dallanave, G. St‐Onge   +6 more
wiley   +1 more source

Influence of Glacial Isostatic Adjustment on Intraplate Stress and Seismicity in Eastern North America in the Presence of Pre‐Existing Weak Zones

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Eastern North America has hosted significant historical earthquakes, where seismicity clusters along tectonically inherited structures. Using the spherical finite‐element code CitcomSVE and fully 3D viscosity structure, we model the intraplate stress response to glacial isostatic adjustment (GIA) using ICE‐6G, both with and without low ...
Erin Hightower, Michael Gurnis
wiley   +1 more source

Distinct Fracture Mineralogy That is Out of Equilibrium With Modern Groundwaters Provides Important Context for Subsurface Life

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 10, October 2025.
Abstract Rock fracture surfaces in the crust are essential habitat for microorganisms. Fracture‐groundwater interfaces provide physical substrates for biofilm growth and are sources of carbon, nutrients, and electron donors and acceptors. To better understand geochemical processes impacting fracture surfaces and the subsurface microbiome, we identified
Christopher J. Schuler, Sarah L. Nicholas, Ryan Tappero, Dean M. Peterson, Cara M. Santelli, Brandy M. Toner   +5 more
wiley   +1 more source

Revisit of the Fennoscandian Shield along the UPPLAND seismic profile: competitive velocity models [PDF]

Solid Earth
This paper presents a comprehensive re-analysis of seismic data collected along the UPPLAND profile in the Fennoscandian Shield, focusing on the competitive velocity models for P-wave (Vp) and S-wave (Vs) velocities and the Vp/Vs ratio.
T. Janik, R. Lahtinen, M. Bociarska, P. Środa, D. Wójcik   +4 more
doaj   +1 more source

Scheme of mineral facies of metamorphic rocks and its application to the Fennoscandian shield with representative sites of orogenic gold mineralization

Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2015
Our recent studies of metamorphism within the Fennoscandian (or Baltic) Shield area with representative sites of orogenic gold mineralization based on the scheme of mineral facies of metamorphic rocks introduced earlier inspired thorough revision of that
Сергей Алексеевич Бушмин, Виктор Андреевич Глебовицкий, Sergey Bushmin, Viktor Glebovitsky   +3 more
doaj   +1 more source

Thiobacillus as a key player for biofilm formation in oligotrophic groundwaters of the Fennoscandian Shield. [PDF]

NPJ Biofilms Microbiomes, 2023
Lopez-Fernandez M, Westmeijer G, Turner S, Broman E, Ståhle M, Bertilsson S, Dopson M.   +6 more
europepmc   +1 more source

Carbonatite complexes of circular (ring) and linear structural-morphological type: the comparison of fenite haloes at the example of Alno (Sweden) and Chernigovka (Ukraine) massifs

Мінеральні ресурси України, 2015
Mineralogical, petrographic and geochemical features of fenitization halos of circular (ring) and linear carbonatite complexes, Alno (Sweden) and Chernigovka (Ukraine), respectively, have been investigated.
Yu. Ye. Nykanorova, I. I. Lazareva, S. Ye. Shnyukov, O. V. Kovtun   +3 more
doaj  

Decoupling of scandium and rare earth elements in organic (nano)particle-rich boreal rivers draining the Fennoscandian Shield. [PDF]

Sci Rep, 2023
Klimpel F, Bau M.
europepmc   +1 more source