Results 61 to 70 of about 672 (207)

Magma and Mineral Composition Response to Increasing Slab-Derived Fluid Flux: Nevado de Longaví Volcano, Southern Chilean Andes

Frontiers in Earth Science, 2022
Nevado de Longaví volcano (NLV), in the Southern-Central Chilean Andes, has erupted during the Holocene magmas with compositions that are in several ways atypical for the region.
Daniel Sellés, Daniel Sellés, Michael Dungan, Charles Langmuir, Ana Carolina Rodríguez, Ana Carolina Rodríguez, William P. Leeman   +6 more
doaj   +1 more source

Radiogenic and Stable Isotope Evidence for Recycling of Ancient Oceanic Crust in High‐Nb Basalts From Baja California, Mexico

Geophysical Research Letters, Volume 52, Issue 18, 28 September 2025.
Abstract The genesis of high‐Nb basalts (HNB) in subduction zones remains controversial, attributed to melting products of metasomatized mantle linked to recent or ancient subduction events. Here we present radiogenic isotope and molybdenum compositions for post‐subduction HNBs and adakites from Baja California, Mexico. The HNBs show more radiogenic Sr‐
Hai‐Quan Liu, Jie Li, Thierry Calmus, Alfredo Aguillón‐Robles, Le Zhang, Long Zhang, Xiao‐Long Huang, Yi‐Gang Xu   +7 more
wiley   +1 more source

Petrography, Petrology, and Geochemistry of Subvolcanic Bodies in Dogan Porphyry Copper-Molybdenum Deposit (Toroud-Chah Shirin Belt) [PDF]

پترولوژی
IntroductionDogan mining area is located on the northern edge of Iran's central desert plain and northwest of Toroud village. Structurally, the area is a part of Central Alborz, Eastern Alborz, and Central Iran zones, which gave rise to the formation of ...
Shadi Sattari, Mohammadreza Hosseinzadeh, Mohsen Moayyed   +2 more
doaj   +1 more source

Petrogenesis of the Riacho do Icó Stock: evidence for Neoproterozoic slab melting during accretion tectonics in the Borborema Province?

Brazilian Journal of Geology, 2020
One of the main characteristics of the Borborema Province in northeastern Brazil is the abundance of granitic domains. The Lagoa das Pedras plutonic-volcanic Complex record remnants of early to late Neoproterozoic primitive to highly evolved magmas. U-Pb
Lauro Cézar Montefalco de Lira Santos, Haroldo Monteiro Lima, Geysson de Almeida Lages, Fabrício de Andrade Caxito, José Ferreira de Araújo Neto, Ignez de Pinho Guimarães   +5 more
doaj   +1 more source

Resolving Crustal and Subcrustal Dynamic Sources in Continental Arc Magmas: The Cenozoic Andean Arc of Central Chile

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract The Andean margin of Central Chile (∼32°40′–34°30′S) records abundant Cenozoic arc magmatic activity with variable compositional characteristics. This is examined through the analysis of an extensive database of new and published whole‐rock geochemistry and Sr‐Nd isotopic compositions, in addition to zircon Hf and O isotopic compositions.
M. Muñoz‐Gómez, C. M. Fanning, F. Tapia, I. Payacán, F. Fuentes, M. Farías, R. Charrier, M. Polvé, S. Quiñones, K. Deckart, A. Fock   +10 more
wiley   +1 more source

Genesis of adakite-like lavas of Licancabur volcano (Chile-Bolivia, Central Andes) [PDF]

, 2009
The Licancabur volcano is located on the Bolivia-Chile Altiplano (Central Andes). The lavas are andesites and dacites. Numerous mineralogic features attest that magma mixing occurred.
Bernard Déruelle, Figueroa, Oscar, Demaiffe, Daniel, Déruelle, Bernard, Oscar Figueroa, Daniel Demaiffe   +5 more
core   +1 more source

Petrogenesis of Quartz Diorite in the Datian Complex, Western Yangtze Block: Evidence from U-Pb Geochronology, Geochemistry, and Sr-Nd-Hf Isotopes

Applied Sciences
This study presents integrated zircon U-Pb geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopic investigations of quartz diorite and gneissic quartz diorite from the Datian Complex along the western Yangtze Block, elucidating their petrogenesis ...
Jian Yao, Youliang Chen, Yu Wu, Jing Zhao, Luyu Huang, Minghui Yin   +5 more
doaj   +1 more source

Offshore Record of Explosive Volcanic Eruptions in the Southern Part of the Panamá Basin During the Past 10 Myr: 2. Inferences About the Construction of the Northern Andean Arc and Regional Geodynamics

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Volcanic material preserved in marine and lacustrine sediments is a key high‐resolution archive for studying the past eruptive history of volcanic regions. In this work, we use the geochemical and isotopic compositions of marine volcanic glass shards, the thicknesses, and age models of tephra layers preserved in the deep sediments of the ...
Mathilde Bablon, Pablo Samaniego, Jean‐Luc Le Pennec, François Nauret, François Michaud, Marianne Saillard, Silvana Hidalgo, Jean‐Luc Devidal, François Orange, Céline Liorzou, Gueorgui Ratzov   +10 more
wiley   +1 more source

Late Cretaceous Extensional Collapse Driven by Delamination in Central Tibet Prior to India‐Asia Collision

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract A diverse range of dikes in the western Lhasa–Qiangtang collision zone provides constraints on the evolution of post‐collisional tectonomagmatic processes and the growth of the Tibetan Plateau. We report geochronological, geochemical, and Sr–Nd–Hf isotopic data for granitic dikes in the Rebang area of the Northern Lhasa Block, northern Tibet ...
Yao Xiao, Xi Jun Liu, Hao Wu, Min Liu, Hai Yong Liu, Yu Jia Song, Fei Liu   +6 more
wiley   +1 more source

Discovery of an adakite-like pluton near Dongqiyishan (Beishan, NW China) - Its age and tectonic significance

, 2012
The Dongqiyishan granitic pluton is exposed in the Eastern Beishan area, in the central part of the Southern Central Asia Orogenic Belt. SIMS U-Pb zircon dating indicates that the Dongqiyishan pluton was emplaced at 356 +/- 2 Ma. Geochemically the pluton
Wu, Tairan, Zhang, Wen,, Xu, Cao, Pease, Victoria, Luo, Hongling, He, Yuankai, Zheng, Rongguo, Zhang, Wen, Feng, Jicheng, Pease, Victoria,   +9 more
core   +1 more source