Results 61 to 70 of about 313,354 (211)
Earthquake Spectra, Volume 42, Issue 4, November 2026.The U.S. Atlantic and Gulf Coastal Plain (CP) sediments are kilometers‐thick, low‐velocity deposits underlain by high‐velocity bedrock that create regional patterns of amplification and attenuation of ground motions. Capturing these effects is challenging because of the limited subsurface information available, particularly the shear wave velocity (VS)
Cassie Gann‐Phillips +5 more
wiley +1 more source
Long‐term trends in greenness in the alpine zone of northeastern North America from remote sensing
Ecosphere, Volume 17, Issue 9, September 2026.Abstract Alpine zones above treeline in the Appalachian Mountains and adjacent ranges of northeastern North America support distinctive ecological communities that thrive where conditions are too harsh for trees to grow. These communities differ from alpine zones elsewhere on the continent and are a regionally important source of floristic biodiversity,
Jonathan W. Chipman +2 more
wiley +1 more source
Rapport Grønlands Geologiske Undersøgelse, 1974 In the area of Julianehåb granite along the south-west coast of Greeniand remnants of volcanic rocks are widespread. Well banded, intermediate tuffs occur on Mato and adjacent islands to the west of Julianehåb (Nesbitt, 1961; Allaart, 1967). Intermediate plagioclase-porphyritic rocks occur associated with aplitic gneiss north of Bredefjord.
S Pedersen, J.H Allaart, O Larsen
openaire +2 more sources
Tectonics, Volume 45, Issue 9, September 2026.Abstract The mechanisms by which new subduction zones form remain highly debated. Here we use Permo‐Triassic strata to evaluate potential mechanisms for initiation of the Talkeetna‐Bonanza Arc of the northern North American Cordillera. New mapping and analysis of Permian and Upper Triassic strata on the Alaska Peninsula suggest a period of uplift ...
Brandon M. Keough +2 more
wiley +1 more source
Metamorphic Reactivity Influences Amphibole Creep Behaviour
Journal of Metamorphic Geology, Volume 44, Issue 8, Page 611-632, September 2026.ABSTRACT The rheological behaviour of solid‐solution minerals may play an important role in determining how metamorphic crust accommodates deformation. Whether or not a mineral's deformation is diffusion or dislocation‐mediated depends on a range of extrinsic variables such as stress, strain rate and temperature, as well as intrinsic variables such as ...
Alix Osinchuk +2 more
wiley +1 more source
Geophysical update of the diameter of the Zhamanshin impact structure, Kazakhstan
Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2284-2302, September 2026.Abstract The rim of the 0.9‐Ma‐old Zhamanshin impact crater in Kazakhstan is considered to be almost completely exposed via a series of hills surrounding a central flat area, indicating an apparent diameter of 14 km. This would make Zhamanshin the second largest impact crater of the Quaternary period. However, the overall geometry of these hills is not
Yoann Quesnel +6 more
wiley +1 more source
Iron Isotopes Reveal Fe Export Driven by Change of Tropical Weathering Regime
Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.Abstract Unraveling paleoenvironmental signals recorded in laterites is crucial for quantifying weathering‐driven elemental fluxes at the Earth's surface. New stable iron isotope data (δ56Fe), combined with (U‐Th)/He ages in Fe‐oxides from a ferruginous duricrust from French Guiana, reveal the response of Fe hosted in laterite to past changes in ...
Z. Fekiacova‐Castanet +11 more
wiley +1 more source
The Shebandowan group: "Timiskaming-like" Archean rocks in northwestern Ontario
, 1987 This group of Archean volcanic and metasedimentary rocks is generally considered to be younger than the Keewatin metavolcanic rocks. The metasedimentary rocks are disposed in tight to isoclinal folds with strong plunge variations that are mainly due to ...
H. Brown, G. Borradaile
core +1 more source
Tectonics, Volume 45, Issue 8, August 2026.Abstract The assembly of Gondwana involved several Pan‐African orogens, although their extension into ice‐covered Antarctica remains contentious. Particularly problematic is our understanding of the Kuunga orogenic system in East Antarctica, including its eroded architecture and temporal evolution. The remote Charcot Province, at the easternmost extent
Jacqueline A. Halpin +4 more
wiley +1 more source
Journal of Metamorphic Geology, Volume 44, Issue 7, Page 510-536, August 2026.ABSTRACT The processes involved during subduction initiation (SI) remain poorly constrained, in part due to the rarity of geological archives. Ophiolites and their underlying metamorphic soles are thought to form during subduction zone infancy and may thus provide critical constraints. Metamorphic soles are derived from oceanic crust of the lower plate
François Fournier‐Roy +11 more
wiley +1 more source