Results 71 to 80 of about 19,957 (229)

Boninite and Harzburgite from Leg 125 (Bonin-Mariana Forearc): A Case Study of Magma Genesis during the Initial Stages of Subduction [PDF]

, 1992
Holes drilled into the volcanic and ultrabasic basement of the Izu-Ogasawara and Mariana forearc terranes during Leg 125 provide data on some of the earliest lithosphere created after the start of Eocene subduction in the Western Pacific.
Arculus, Richard J., Ishii, Teruaki, Murton, Bramley J., Parkinson, Ian J., Pearce, Julian A., Peate, David W., van der Laan, Sieger R.   +6 more
core   +1 more source

Quantitative Assessment of Peridotite Tectonomagmatic Affinities Using Compositional Data Analysis and Explainable Machine Learning

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Peridotites record the compositional evolution of the lithospheric and asthenospheric mantle across plume‐related lithospheres, convergent margins, and rift‐related volcanic environments; however, their tectonomagmatic affinities are commonly difficult to resolve using traditional low‐dimensional geochemical discrimination diagrams.
Swarnendu Roy, Koushik Sen
wiley   +1 more source

Chemical Geodynamics of Granitoid Magmatism During a Pacific‐Philippine Sea Plate Transition in Southwest Japan

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Granitoid magmatism along the western Pacific margin records interactions between subduction dynamics and crust–mantle processes; however, the links between plate reorganization and magma‐source evolution remain debated. Here we integrate U–Pb zircon geochronology with Pb–Sr–Nd–Hf isotope systematics to investigate Cretaceous–Paleogene ...
Nghiem V. Dao, Tsegereda A. Yemer, Tulibako T. Mwaisuba, Chie Sakaguchi, Hiroshi Kitagawa, Katsura Kobayashi, Teruyoshi Imaoka, Eizo Nakamura   +7 more
wiley   +1 more source

Epidote Records (De)hydration From the Seafloor Through Subduction and Underplating: Implications for Subduction Zone Fluid Budgets and Slow Slip

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract When, where, and how much fluid is released from subducting oceanic crust control deformation, element cycling, and magmatism in subduction zones. However, the palimpsest of tectonometamorphic processes in the exhumed rock record complicates the relation of geologic observations to geodynamic models of subduction fluid sources and transport ...
P. C. Lindquist, C. B. Condit, W. F. Hoover, V. E. Guevara, G. S. Epstein   +4 more
wiley   +1 more source

Evolving force balance during incipient subduction [PDF]

, 2004
Nearly half of all active subduction zones initiated during the Cenozoic. All subduction zones associated with active back arc extension have initiated since the Eocene, hinting that back arc extension may be intimately associated with an interval ...
Gurnis, Michael, Hall, Chad, Lavier, Luc
core   +1 more source

Variable Oceanic Crust Accretion at a Slow‐Spreading Ridge: A Vp/Vs Ratio Evidence Across the Southwest Sub‐Basin of the South China Sea

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract The opening of the Southwest Sub‐basin (SWSB) of the South China Sea was slow‐spreading and has been propagated toward the southwest. Yet, the structural variability and magmatic accretion process of the SWSB are still enigmatic. Here, utilizing a wide‐angle seismic profile traversing the central segment of the SWSB, we obtain detailed S‐wave ...
Ye Yuan, Yuhan Li, Yongjian Yao, Minghui Zhao, Jiazheng Zhang, Enyuan He, Lianjun Li   +6 more
wiley   +1 more source

Tourmaline chemistry and investigation of its formation conditions in the northern intrusive body of the Nain ophiolite complex in the northeast of Isfahan Province [PDF]

پترولوژی
IntroductionGeographically, the granitoid intrusion under investigation is located in Ardestan, in the northeastern part of Isfahan Province and to the north of the Nain ophiolitic complex, between longitudes 52°50′ to 53°03′ E and latitudes 33°09′N to ...
Mohammad Ali Mackizadeh, Farimah Ayati, Mojtaba Amini   +2 more
doaj   +1 more source

In Situ Carbonation of Sedimentary and Igneous Rocks of Ultramafic Composition in Jezero Crater, Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Over 3.5 years of exploration in Jezero Crater, the Perseverance rover has explored several geological units of diverse origins and natures, performing multi‐technique remote analyses of the chemistry and mineralogy of rocks with the SuperCam instrument suite.
E. Clavé, O. Beyssac, P. Beck, C. Royer, L. Mandon, N. Mangold, O. Forni, E. Dehouck, C. Bedford, A. Udry, S. Schröder, S. Bernard, C. Quantin‐Nataf, M. Loche, J. Aramendia, A. Brown, G. Caravaca, E. Cardarelli, L. Coloma, S. A. Connell, T. Fouchet, J. R. Johnson, G. Lopez‐Reyes, J. M. Madariaga, J. A. Manrique, S. Maurice, P.‐Y. Meslin, S. Le Mouélic, A. M. Ollila, P. Pilleri, C. Pilorget, K. Rammelkamp, F. Seel, J. I. Simon, U. Wolf, A. Zastrow, S. Clegg, O. Gasnault, R. C. Wiens, A. Cousin   +39 more
wiley   +1 more source

Iron Sources and Cycling During Diagenetic Transformations of Negev Phosphorites (Israel)

Paleoceanography and Paleoclimatology, Volume 41, Issue 4, April 2026.
Abstract The Late Cretaceous Negev area in the Levant was influenced by high productivity upwelling in southern Tethys, leading to massive deposition of phosphorites. The phosphorites occur in two facies: (a) pristine phosphorites with low phosphorous (P) content, formed under low‐energy, high‐productivity conditions, and (b) reworked phosphorites with
Irina Zweig, Alexey Kamyshny Jr., Aya Schneider‐Mor, Nadya Teutsch   +3 more
wiley   +1 more source

Early Cretaceous absolute geomagnetic paleointensities from Córdoba province (Argentina) [PDF]

, 2006
We present here new paleointensity and geochronology results from Early Cretaceous volcanic rocks of Sierra Chica de Cordoba (Argentina). The new K-Ar isotopic ages of 5 samples range from 136 to 122 Ma.
Alva-Valdivia, Luis M., Cejudo Ruiz, Ruben, Geuna, Silvana Evangelina, Goguitchaichvili, Avto, Morales, Juan, Solé, Jesus   +5 more
core   +1 more source