Results 61 to 70 of about 978 (214)

New evidence of the Vuoksi River origin by geodynamic cataclysm [PDF]

Bulletin of the Geological Society of Finland, 2018
The territory of investigations is located in the SE periphery of the Fennoscandian Shield. It served as an arena of periodic significant restructuring of the hydrographic network associated with the filling and discharge of large late-glacial and ...
D.A. Subetto, S.V. Shvarev, A.A. Nikonov, N.E. Zaretskaya, A.V. Poleshchuk, M.S. Potakhin   +5 more
doaj   +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

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

Using a titanium-in-quartz geothermometer for crystallization temperature estimation of the Palaeoproterozoic Suursaari quartz porphyry [PDF]

Estonian Journal of Earth Sciences, 2012
The Suursaari volcanic sequence represents volcanic activity related to Wiborg Batholith rapakivi intrusions in the southern part of the Fennoscandian Shield. The estimated pressure conditions for batholith granitic rocks are 1–5 kbar and crystallization
Kairi Ehrlich, Evelin Verš, Juho Kirs, Alvar Soesoo   +3 more
doaj   +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

De Geer moraine internal architecture based on sedimentological and geophysical investigations and implications for ice‐marginal reconstructions

Boreas, Volume 54, Issue 4, Page 687-710, October 2025.
De Geer moraines may act as valuable ice‐marginal indicators; however, to date, their variable mode of formation has presented challenges for this utility. Here, we present sedimentological and ground penetrating radar data of DGMs located in southwest Finland.
Gwyneth E. Rivers, Robert D. Storrar, Antti E. K. Ojala, Joni Mäkinen, Camilla Holmroos, Naomi Holmes   +5 more
wiley   +1 more source

Use of LiDAR to derive a new model of glacial hydro‐dynamic events shaping southern Ontario landscapes, Canada

Boreas, Volume 54, Issue 4, Page 590-624, October 2025.
High‐resolution LiDAR data with field validation of inferred southern Ontario ice stream terrains indicate that steady‐state ice streaming is difficult to reconcile with our observations. Rather, these new observations show strong evidence of significant fluvial scouring across the area in which meltwater sheet flow overtopped the landscape.
David R. Sharpe, Chris C. Smart
wiley   +1 more source

Geochemistry and Texture of Clinopyroxene Phenocrysts from Paleoproterozoic Picrobasalts, Karelian Craton, Fennoscandian Shield: Records of Magma Mixing Processes [PDF]

, 2020
С. А. Светов, Svetlana Chazhengina, A. V. Stepanova   +2 more
openalex   +1 more source