Results 141 to 150 of about 96,687 (276)

Ion microprobe zircon geochronology of the Uivak Gneisses: Implications for the evolution of early terrestrial crust in the North Atlantic Craton [PDF]

Ion microprobe U-Pb results for zircons from three Uivak I gneisses and one specimen of Uivak II gneiss, from the Saglek-Hebron area of Northern Labrador are reported.
Collerson, K. D.
core   +1 more source

Refinement of high-spatial resolution U-Pb geochronological methodologies

, 2021
APPROVED Zircon [ZrSiO4] is a naturally occurring mineral commonly used in geochronological, isotope and elemental geochemical studies. It can form as an accessory phase in a wide variety of magmatic and metamorphic conditions and is remarkably stable both physically and chemically over geological timescales.
openaire   +1 more source

Limitotipes of Lower Sakmarian and Artinskian stages boundary in the Urals

Литосфера, 2015
The section Usolka and duplicating its section Dal’ny Tulkas (Bashkortostan) are proposed as the stratotypes of the Lower Sakmarian stage boundary and Lower Artinskian stage boundary of the International Stratigraphic scale.
V. V. Chernykh, B. I. Chuvashov
doaj   +2 more sources

Geochemical Disequilibrium at the Brittle‐Ductile Transition

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract We investigate the microtextural, microchemical, and isotopic effects of late‐stage ductile deformation in quartzite mylonites and kyanite–muscovite–quartz veins from the Raft River shear zone (Utah). Quartz microstructures record pervasive disequilibrium, expressed by unannealed features including undulatory extinction, deformation lamellae ...
Raphaël Gottardi, Ryan McAleer, Gabriele Casale, Martin Wong   +3 more
wiley   +1 more source

Timing of Dike and Sill Emplacement in the Inner Aureole of the Alta Stock, Utah Determined by Zircon and Monazite Petrochronology

Geochemistry, Geophysics, Geosystems
Detailed geochronology from two compositionally distinct generations of dikes and sills intruded into the Alta metamorphic aureole, north‐central Utah, complement previous geochronologic studies from the Alta stock, providing information on the timing of
C. J. Beno, M. A. Stearns, J. R. Bowman, J. M. Bartley, D. P. Fernandez, A. R. C. Kylander‐Clark   +5 more
doaj   +1 more source

Permian fluid circulation and deformation along a crustal-scale shear zone in the Montagne Noire gneiss dome (southern French Massif Central)

BSGF - Earth Sciences Bulletin
U-Th-Pb LA-ICPMS (Laser Ablation − Inductively Coupled Plasma Mass Spectrometry) has the power to elucidate the timing of metamorphism, deformation, migmatization, and plutonism.
Roger Françoise, Trap Pierre, Teyssier Christian, Whitney Donna L., Paquette Jean-Louis, Hamelin Clémentine, Respaut Jean-Patrick, Coëffier Noëllie, Vanardois Jonas, Rey Patrice F.   +9 more
doaj   +1 more source

Holocene Normal Faulting in the Southern Rocky Mountain Trench; Orogenic Collapse Modulated by Glacial Unloading?

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract The Southern Rocky Mountain Trench (SRMT) is a conspicuous valley in the eastern Canadian Cordillera. It lies above a sharp change in lithospheric strength and thickness and is occupied by a normal fault thought to have last been active in the Eocene.
T. Finley, E. Nissen, L. J. Leonard, J. F. Cassidy, V. Prush, B. Miller   +5 more
wiley   +1 more source

Evidence for Long‐Term Coupling of Deep Ocean Carbon Storage and Global Climate Over the Past 4.5 Million Years

Paleoceanography and Paleoclimatology, Volume 41, Issue 4, April 2026.
Abstract Robust evidence indicates that late Pleistocene glacial‐interglacial climate cycles are linked to periodic, orbitally‐forced changes in the partitioning of CO2 between the deep ocean and atmosphere. The extent to which changes in deep ocean carbon storage are related to climate on longer timescales is less well understood.
Joseph B. Novak, Jordan T. Abell, Christopher W. Kinsley   +2 more
wiley   +1 more source

A database of detrital zircon U–Pb geochronology and Hf isotopes from the Songpan–Ganzi and Western Qinling terranes

Geoscience Data Journal
Since the advent of detrital geochronology, significant progress has been made in the study of sedimentary sources. The detrital zircon U–Pb age spectrum, especially when combined with zircon Hf isotopes, provides a powerful tool for determining the ...
Yingdi Pan, Xiumian Hu
doaj   +1 more source

U-Pb geochronology of the South Mountain Batholith, Nova Scotia

, 2018
The South Mountain Batholith (SMB) is a composite peraluminous intrusion in southwestern Nova Scotia and the largest granitoid body in the Appalachian Orogen. The batholith comprises early stage biotite-granodiorite to biotite-monzogranite and a later stage of leucomonzogranite to leucogranite plutons that are associated with numerous sub-economic to ...
L Bickerton, D J Kontak, I M Samson, J B Murphy, D A Kellett   +4 more
openaire   +1 more source