Results 21 to 30 of about 60 (48)

Assessing Pb Isotopic Equilibrium Between Apatite and K‐Feldspar

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract Quantifying common Pb, the non‐radiogenic Pb present in a mineral independent of in situ U decay, is essential for obtaining accurate U–Pb ages in common Pb‐bearing minerals such as apatite. However, constraining the amount and composition of common Pb, as well as the timing of its entrapment, remains a persistent challenge.
Priyanjan Datta, Christopher L. Kirkland, Janne Liebmann, Hugo K. H. Olierook   +3 more
wiley   +1 more source

Cooling‐Induced Rheological Weakening Along the Nascent Plate Interface—A Mechanism for Catastrophic Subduction Initiation?

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 1, January 2026.
Abstract Subduction initiation often begins with slow, forced convergence, switches “on” catastrophically as the slab collapses into the mantle, and then evolves to steady‐state, self‐sustained sinking that drives global plate movements. Numerical models suggest that the collapse phase implies sudden weakening of the plate interface.
Alissa J. Kotowski, Caroline E. Seyler, James D. Kirkpatrick, Douwe J. J. van Hinsbergen   +3 more
wiley   +1 more source

Ultrahigh‐Temperature Metamorphism and Near‐Isobaric Cooling of Garnet‐Orthopyroxene Granulite Xenoliths in the Sancheong Anorthosite, Yeongnam Massif, Korea

Journal of Metamorphic Geology, Volume 44, Issue 1, Page 20-46, January 2026.
ABSTRACT Elevated heat flow associated with mafic magmatism in accretionary orogens has often been proposed as a driving mechanism for (ultra)high‐temperature (UHT) metamorphism and anatexis. The Sancheong–Hadong complex, located in the southern Yeongnam Massif, Korea, consists of a ca.
Yuyoung Lee, Moonsup Cho, Jeongmin Kim, Youn‐Joong Jeong   +3 more
wiley   +1 more source

Radiogenic Heating as the Thermal Driver of Himalayan Crustal Heating During Prolonged Thickening

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract The thermal evolution of the crust during continental collision evolves from cold to hot with time, which impacts crustal reworking and differentiation. However, it remains elusive as to the mechanism driving the crust to be hot during the protracted collision.
Shuaiqi Liu, Guibin Zhang, Lifei Zhang, Shuzhen Wang, Feng Chang   +4 more
wiley   +1 more source

Precambrian Greenstone Belts of North Baffin Island, Canadian Arctic: Geochronological Constraints on Magmatism and Stratigraphy in the Rae Craton

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Supracrustal greenstone belts of the Rae craton of north Baffin Island have been historically attributed to the Mary River Group (MRG), a key tectonostratigraphic unit of economic significance. Best‐preserved exposures of supracrustal rocks occur within the Eqe Bay Greenstone Belt.
B. M. Saumur, C.‐P. Folkesson, D. R. Skipton, J. H. F. L. Davies, N. Wodicka, S. T. Johnston   +5 more
wiley   +1 more source

Tectonothermal Evolution of the NW Wyoming Province: Insights From Coupled Garnet Lu‐Hf and Sm‐Nd Geochronology

Journal of Metamorphic Geology, Volume 43, Issue 8, Page 839-862, October 2025.
ABSTRACT Understanding how Paleoproterozoic orogenic processes shaped the assembly of Laurentia remains a critical puzzle in deciphering Earth's ancient tectonic history. To address this challenge, the Montana metasedimentary terrane in the northwest Wyoming Province, which preserves a complex record of multiple metamorphic episodes, provides a unique ...
Tsai‐Wei Chen, Jeff Vervoort, Julia Baldwin, Peter Baker   +3 more
wiley   +1 more source

Intermittent Brittle and Ductile Deformation as Recorded by Dating of Ultramylonites and Pseudotachylytes in Extending Continental Crust (Ivrea‐Verbano Zone, Italy)

Terra Nova, Volume 37, Issue 5, Page 277-286, October 2025.
ABSTRACT Mylonites and pseudotachylytes play a crucial role in defining the rheology of extending continental crust. In this context, determining the age of brittle‐ductile deformation is fundamental to understanding the rifting evolution stages. Here, we investigate the Premosello Shear Zone, an extensional structure of the Ivrea‐Verbano lower crust ...
Stefania Corvò, Chiara Montemagni, Stefano Zanchetta, Antonio Langone   +3 more
wiley   +1 more source

Eoarchean–Paleoproterozoic Tectonothermal History of the Acasta Gneiss Complex Constrained by Titanite and Apatite Petrochronology

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Deciphering Earth's earliest geodynamic processes requires temporally constrained chemical and structural data from rare exposures of ancient rocks. One of the most well‐studied of these exposures is the Acasta Gneiss Complex (AGC) in the Northwest Territories, Canada, which contains the oldest known felsic rocks on Earth.
Omar Khalil Droubi, Ann M. Bauer, Chloë Bonamici, William O. Nachlas, Joshua M. Garber, Michael J. Tappa, Jesse R. Reimink   +6 more
wiley   +1 more source

Metasomatism and Melting of Cordilleran Lithosphere Resulting From Sediment Relamination During Shallow Subduction

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Mantle xenoliths recovered from the modern backarc region of the northern Altiplano Plateau record metasomatism by slab‐derived silicic melts, and a suite of Quaternary volcanics suggest that melting of accreted crustal material has persisted since shallow subduction in the Oligocene.
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
wiley   +1 more source

Structures and Leucogranites in the Eastern Himalayan Orogen From Reprocessed INDEPTH‐I Deep Seismic Reflection Profile

Tectonics, Volume 44, Issue 6, June 2025.
Abstract The INDEPTH‐I seismic reflection transect provides a unique data set for understanding active mountain‐building processes during continental collision in the Himalaya and has played a key role in the development of ductile extrusion and channel flow concepts.
Hongqiang Li, Rui Gao, Zhanwu Lu, Jiamin Wang, Xingfu Huang, Ramon Carbonell   +5 more
wiley   +1 more source