Results 31 to 40 of about 946 (178)

Petrogenetic evidences in geodynamics and placement of Nordoz intrusive masses in Alborz-Azerbaijan structural zone

Journal of Economic Geology
The Oligocene Nordoz intrusive complex is located in the eastern region of Siehroud, within the East Azerbaijan province, and within the Alborz-Azerbaijan structural zone.
Shahryar Mahmoudi , Shiva Lavi, Shohreh Hassanpour, Amir Ali Tabakh Shabani , Mehran Yegane Far   +4 more
doaj   +1 more source

The Temperature and Composition of the Mantle Sources of Martian Basalts

Geophysical Research Letters, 2023
The composition of basaltic melts in equilibrium with the mantle can be determined for several Martian meteorites and in‐situ rover analyses. We use the melting model MAGMARS to reproduce these primary melts and estimate the bulk composition and ...
Max Collinet, Ana‐Catalina Plesa, Thomas Ruedas, Sabrina Schwinger, Doris Breuer   +4 more
doaj   +1 more source

Mantle Xenolith Evidence for Lithospheric Thinning and Metasomatic Modification Beneath the Eastern Fiji Plateau: Implications for Samoan Plume Supply, Intraplate Volcanism, and Orocline Formation

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
We provide petrographic and geochemical characterisation of mantle xenoliths from Koro Island, eastern Fiji. Several lherzolite xenoliths display spinel–pyroxene symplectite textures, including preserved former grain boundaries, consistent with garnet breakdown that we attribute to thinning of a preexisting garnet‐facies lithospheric mantle beneath ...
Natasha Barrett, Stephen T. Johnston, Neil N. Kumar, Holger Sommer, D. Graham Pearson   +4 more
wiley   +1 more source

CO2‐Rich Rejuvenated Stage Lavas on Hawaiian Islands

Geochemistry, Geophysics, Geosystems, 2022
Sedimentary carbonates are sent to the deep mantle if they are not completely destroyed at subduction zones, and subducted carbonates may contribute to plume volcanism.
Guoliang Zhang, Shuai Wang, Shichun Huang, Mingjun Zhan, Junhua Yao   +4 more
doaj   +1 more source

Subduction Zone Magnetism: The Influence of Metamorphism and Serpentinization in the Mantle Wedge

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Subduction zone magnetic anomalies have previously been used to infer their thermal structure assuming a uniformly serpentinized mantle carries a homogeneous, isotropic magnetization. However, seismic tomography, geological observations and numerical modeling provide increasing evidence for a non‐uniformly serpentinized mantle wedge that may ...
Y. Li, P. C. Lindquist, D. Han, B. Fish, R. J. Harrison, W. McCarthy, R. M. Palin, C. B. Condit, C. I. O. Nichols   +8 more
wiley   +1 more source

Geochemistry and Geochronology of A‐Type Intermediate‐Felsic Rocks in NW Himalaya, Pakistan: Implications for Petrogenesis and Tectonic Evolution of Northern Gondwana

Geochemistry, Geophysics, Geosystems
Igneous intrusives in northern Pakistan can provide valuable insights into pre‐Himalayan metaluminous to peraluminous magmatism along the northern boundary of the supercontinent Gondwana and its potential tectonic significance.
Musa Khan, Huan Li, Thomas J. Algeo, Asad Khan, Michael W. Förster, Zaheen Ullah   +5 more
doaj   +1 more source

Rapid Slab Rollback Drives Early Cretaceous Back‐Arc Extension in NE China: Implication for Crustal Growth and Episodic Porphyry Mineralization

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract The subduction of the Paleo‐Pacific Plate beneath the NE Asian continental margin induced extensive magmatism, providing an excellent opportunity to investigate the interplay between plate dynamics, arc magmatism, continental crust formation, and porphyry mineralization.
Honghui Wang, Xinghua Ma, Simon A. Wilde, Yong Lai, Zhenhua Zhou, Jinyu Yan   +5 more
wiley   +1 more source

Eocene Lamproitic Magmatism in Gangdese: Melting Sub‐Arc Lithospheric Mantle and Implications for the Early Cenozoic Magmatic “Flare Up” in Southern Tibet

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract The role of sub‐arc mantle lithosphere in the build‐up of a batholith is an outstanding issue that is still not well resolved. Lamproite is a mantle‐derived magmatic rock that provides a window to learn the composition and the enrichment processes of subcontinental lithospheric mantle (SCLM).
Y. H. Tian, L. S. Zeng, L. H. Zhao, L. L. Yan, G. X. Li   +4 more
wiley   +1 more source

Seismic Constraints on Temperature, Partial Melt, and Lithosphere‐Asthenosphere Dynamics in the Southwestern United States

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract The southwestern United States hosts well‐documented and dramatic variations in topography, seismicity, heat flow, magmatism, and seismic velocity structure. This region offers opportunities to investigate how processes such as temperature and partial melt are related to the Lithosphere‐Asthenosphere Boundary (LAB), and how they ultimately ...
E. M. Golos, K. M. Fischer, Z. Eilon
wiley   +1 more source

Slab Gap‐Related Intraplate Magmatism as a Proxy of Maximum Flat Slab Extent in Patagonia

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Establishing the frontal extent of ancient flat subduction events from the geologic record can be challenging. This difficulty arises because magmatic activity in the arc typically ceases during complete slab flattening, and other meaningful proxies are usually absent. To address this issue, we examine early Paleocene intraplate magmatic units
C. R. Navarrete, G. M. Gianni, G. I. Massaferro, M. B. Lastra   +3 more
wiley   +1 more source