Results 11 to 20 of about 98 (95)
Journal of Geophysical Research: Earth Surface, Volume 128, Issue 12, December 2023., 2023 Abstract Provenance information from recent and ancient sedimentary archives is obscured by several factors and for disentangling these intermingled signals, analysis by multiple methods is paramount. In sedimentary provenance analysis (SPA), single‐grain methods determining mineralogy, chemical composition, or radiometric ages are of key importance ...
Nils Keno Lünsdorf +7 more
wiley +1 more source
Journal of Geophysical Research: Earth Surface, Volume 128, Issue 11, November 2023., 2023 Abstract The Niger River drains a large part of the West African Craton, where rocks ranging in age from Paleoarchean to recent offer an unexcelled opportunity to map the diverse time structures of sediment sources and provide essential information for provenance diagnoses.
Guido Pastore +6 more
wiley +1 more source
Provenance of altered carbon phases and impact history of the Stac Fada Member, NW Scotland
Meteoritics &Planetary Science, Volume 58, Issue 8, Page 1099-1116, August 2023., 2023 Abstract The Stac Fada Member (Stoer Group) is a ~1.2 Ga melt‐rich impact breccia preserved and intermittently exposed along the NW coast of Scotland. Using a combination of x‐ray diffraction and micro‐Raman spectroscopy, we identify potential coesite that is spatially associated with micron‐sized diamonds, as well as disordered carbon phases ...
Arthur Goodwin +4 more
wiley +1 more source
Tectonics, Volume 42, Issue 3, March 2023., 2023 Abstract U‐Pb dates of zircon, monazite, and titanite combined with trace element composition, allows characterization of the thermal evolution of the migmatitic Agua del Sapo complex. This complex comprises Al‐rich and Ca‐rich metasedimentary rocks with a detrital zircon maximum depositional age of 550 Ma.
Pablo Farias +3 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, Volume 24, Issue 3, March 2023., 2023 Abstract The Barrovian metamorphism of the Lepontine dome is manifested by isograds that cross‐cut tectonic nappe contacts, which is commonly interpreted as metamorphism that occurred after nappe emplacement. However, the pervasive mineral and stretching lineation in amphibolite facies, associated with top‐to‐foreland shearing, suggests that peak ...
A. Tagliaferri +4 more
wiley +1 more source
Tectonics, Volume 45, Issue 8, August 2026.Abstract The Sangre de Cristo Range in southern Colorado records a complex tectonic history that includes Late Cretaceous–Eocene Laramide contraction and Oligocene–Quaternary Rio Grande rift extension. We present new thermochronologic data (40Ar/39Ar, fission‐track, (U‐Th)/He) and thermal history models that provide insight into this polyphase history ...
John Singleton +10 more
wiley +1 more source
Tectonics, Volume 45, Issue 6, June 2026.Abstract The assembly and breakup of the supercontinent Rodinia set the stage for Earth system evolution through the Neoproterozoic Era. Laurentia, the central craton in Rodinia, lacks well‐dated paleomagnetic poles between ca. 990 Ma and 780 Ma. In this study, we develop new U‐Pb petrochronology and thermochronology data sets from zircon, garnet ...
Yiming Zhang +6 more
wiley +1 more source
Mineralogical Evidence for Highly Evolved Th‐Saturated Magma on Mars
Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.Abstract Thorium‐rich (Th‐rich) geological units have been detected by remote sensing in the Martian crust. However, there is still a lack of mineralogical evidence to constrain the magmatic processes responsible for these anomalies. In this study, we report the first discovery of thorite (ThSiO4) grains within a zircon fragment from Martian regolith ...
Xiaojia Zeng, Xiongyao Li
wiley +1 more source
Radioisotopic age constraints of the Cambrian Ritland impact structure, Norway
Meteoritics &Planetary Science, Volume 60, Issue 9, Page 2223-2238, September 2025.Abstract Secondary ion mass spectrometry U‐Pb geochronology has been performed on zircon grains separated from impact melt rock from the 2.7 km‐in‐diameter Ritland impact structure, southwestern Norway. Scanning electron microscope‐based imaging techniques, including electron backscatter diffraction analysis, reveal various zircon grain microtextures ...
William R. Hyde +6 more
wiley +1 more source
Acta Crystallographica Section B, Volume 81, Issue 4, Page 418-426, August 2025.A novel focused ion beam and scanning electron microscope‐based technique has been developed for mounting microcrystals on carbon fibre, making them immediately compatible with single‐crystal X‐ray diffraction. This method has been successfully applied to studying the crystal chemistry of a synthetic Th‐bearing, Na analogues of turkestanite and ...
M. Stachowicz +7 more
wiley +1 more source