Results 71 to 80 of about 1,706 (214)

The Salittu Formation in southwestern Finland, part I: Structure, age and stratigraphy [PDF]

Bulletin of the Geological Society of Finland, 2016
Because of the relatively low metamorphic grade, low strain and well-preserved early structures in volcanic and volcaniclastic rocks, the Orijärvi triangle (in the center of the larger Orijärvi area) is one of the few locations in the Svecofennian orogen
M. Nironen, I. Mänttäri, M. Väisänen
doaj   +1 more source

Glacier Retreat Amplifies Interannual Variability in Watershed Runoff, Organic Carbon and Nutrient Yields

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Glacier retreat is projected to drive major shifts in the hydrology of many high‐elevation and high‐latitude watersheds. In particular, future decreases in glacier runoff are hypothesized to reduce the stability of hydro‐biogeochemical export.
Amy D. Holt, Jason B. Fellman, Robert G. M. Spencer, Emily J. Whitney, Croix Flypaa, David V. D’Amore, Eran Hood   +6 more
wiley   +1 more source

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

Geological Journal, Volume 61, Issue 3, Page 566-592, March 2026.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae, Md. Sazzadur Rahman, Gao Pin, M. Santosh, Wataru Fujisaki, Sam Uthup, Prince Mandingaisa   +6 more
wiley   +1 more source

U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil

Anais da Academia Brasileira de Ciências, 2001
U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt.
FISCHEL DANIELLE P., PIMENTEL MÁRCIO M., FUCK REINHARDT A., ARMSTRONG RICHARD   +3 more
doaj  

Pontiac metavolcanic rocks within the Cadillac tectonic zone, McWatters, Abitibi Belt, Quebec

, 1993
The McWatters metavolcanic rocks are structurally bounded lenses within the Cadillac tectonic zone on the southern boundary of the Abitibi greenstone belt.
Normand Goulet, Marc Bardoux, Michel Jébrak, David Morin   +3 more
core   +1 more source

Growth and Chemical Evolution of the Kohistan Arc Crust, Northern Pakistan, Western Himalayas

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Fossil arcs which expose the middle‐lower crust have the potential to shed light on active arc processes because magmatic rocks from the entire history of the arc can be examined. We present new geochemical data from the middle crust of the Kohistan Arc and use existing geochemical and geochronological literature data from this arc to ...
Paul Sotiriou, Karsten M. Haase, Marcel Regelous   +2 more
wiley   +1 more source

Nb-depleted, continental rift-related Akaz metavolcanic rocks (West Kunlun): implication for the rifting of the Tarim Craton from Gondwana

, 2002
The Akaz metavolcanic rocks of the West Kunlun Mountains possess low to intermediate SiO2 (42.3-64.7 wt%) and MgO (2.69-7.54 wt%) and high TiO2 (0.94-3.05 wt%) and Fe2O3T (7.64-18.47 wt%), indicating a basaltic to andesitic protolith.
Yuan C, Sun M, Yang JS, Zhou H, Zhou MF
core  

Geochemistry and petrology of the Cambrian metavolcanic rocks of the Sierra de San Luis [PDF]

, 2020
En la presente investigación se estudiaron las metavolcanitas ácidas del Cámbrico, localizadas en dos fajas de bajo metamorfismo de la sierra de San Luis. Se describe la petrografía, se presentan análisis químicos y se establece su posición geotectónica.
Poma, Stella Maris, Kronegold de Brodtkorb, Milka Aniela Sofía, Brodtkorb, Mika K. de, Pezzutti, Norma E., Pezzutti, Norma, Fernández, Raúl Roberto   +5 more
core  

The Paleo‐Tethys Suture Zone in the Afghan Hindu Kush‒Pamir: Geo‐Thermochronology, Geochemistry, Tectonics

Tectonics, Volume 45, Issue 3, March 2026.
Abstract In the Afghan Hindu Kush, the 223–209 Ma (≤800°C) Salang batholith is part of the Silk‐Road magmatic arc that was built on ∼40‐km‐thick Turan‐Karakum block continental crust. The batholith constitutes the hanging wall of the Herat‐Panjshir‐Badakhshan—the Paleo‐Tethys—suture zone, vestige of the subducted Paleozoic‐early Mesozoic Paleo‐Tethys ...
Lothar Ratschbacher, Said Amin Hashimy, Hasan Malistani, Yasuhito Osanai, Jianhua Li, Zhao Yang, Bradley R. Hacker, Leander Franz, Hadi Karimi   +8 more
wiley   +1 more source

Test of a spreading-ridge subduction model for the origin of granitoid plutons and metavolcanic complexes in the Palaeoproterozoic Pinal forearc/subduction complex of Southern Arizona, USA

, 2016
The Pinal terrane of southern Arizona has been characterized as a Palaeoproterozoic forearc/subduction complex (Meijer 2014). It contains granitoid plutons and metavolcanic rocks with arc affinities that have a spatial distribution reminiscent of plutons
Arend Meijer (2810965)
core   +1 more source