Results 31 to 40 of about 4,715 (162)

Reassessing the intrusive tempo and magma genesis of the late Variscan Aar batholith: U–Pb geochronology, trace element and initial Hf isotope composition of zircon

Swiss Journal of Geosciences, 2022
The Variscan orogeny was responsible for the formation of a significant volume of igneous basement throughout present-day Europe. Detailed understanding of these rocks has, however, been obfuscated by significant overprinting during younger geologic ...
Mélissa Ruiz, Urs Schaltegger, Sean P. Gaynor, Massimo Chiaradia, Jürgen Abrecht, Christian Gisler, Federico Giovanoli, Michael Wiederkehr   +7 more
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COMMENTS ON THE ARTICLE AUTHORED BY M.V. MINTS AND K.A. DOKUKINA – THE BELOMORIAN ECLOGITE PROVINCE (EASTERN FENNOSCANDIAN SHIELD, RUSSIA): MESO-NEOARCHEAN OR LATE PALEOPROTEROZOIC?

Геодинамика и тектонофизика, 2021
The comments are given on the article authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?
S. G. Skublov, A. V. Berezin, L. I. Salimgaraeva   +2 more
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Hf isotope compositions of northern Luzon arc lavas suggest involvement of pelagic sediments in their source [PDF]

Contributions to Mineralogy and Petrology, 2005
New Hf isotopic compositions for island arc basalts from the Luzon arc (Philippines) define a remarkable sub-horizontal trend in Hf–Nd isotopic space with a small range of ɛHf (+5 to +17) associated with a large variation in ɛNd (−7 to +8). The data plot above and barely overlap the terrestrial array defined by oceanic basalts and continental crust ...
Marini, Jean-Christophe, Chauvel, Catherine, Maury, René   +2 more
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Geochemical studies of shales from the Asu River Group, Lower Benue Trough: Implications for provenance and paleo-environment reconstruction

Solid Earth Sciences, 2022
Combined use of trace elements, rare earth elements (REEs) with hydrogen (δH) and oxygen (δ18O) stable isotope composition to elucidate origin and paleo-environment-conditions and reconstruction is a contemporary trend in the field of geochemistry ...
Anthony Temidayo Bolarinwa, Olufemi Faloye, Sunday Ojochogwu Idakwo   +2 more
doaj   +1 more source

A non-zircon Hf isotope record in Archean black shales from the Pilbara craton confirms changing crustal dynamics ca. 3 Ga ago

Scientific Reports, 2018
Plate tectonics and associated subduction are unique to the Earth. Studies of Archean rocks show significant changes in composition and structural style around 3.0 to 2.5 Ga that are related to changing tectonic regime, possibly associated with the onset
Yona Nebel-Jacobsen, Oliver Nebel, Martin Wille, Peter A. Cawood   +3 more
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A Mesoarchean Large Igneous Province on the Eastern Kaapvaal Craton (Southern Africa) Confirmed by Metavolcanic Rocks from Kubuta, Eswatini

Lithosphere, 2022
Mesoarchean magmatism is widespread on the eastern margin of the Kaapvaal Craton, but its origin is still poorly understood, mainly because geochemical data is rare.
K. P. Schneider, J. E. Hoffmann, A. Kröner, A. Balduin, P. Sprung, A. M. Schleicher, C. Münker   +6 more
doaj   +1 more source

Sr-Nd-Pb-Hf isotopic composition of late paleozoic granitoids of Central Chukotka

Доклады Академии наук, 2019
Results of the study of Sr–Nd–Pb–Hf isotopic composition of Late Paleozoic granitoids of Central Chukotka are represented on the example of Kibera and Kuekvun plutons. The age of granitoids of these plutons and granites from pebbles in conglomerates in the base of overlying Lower Carboniferous deposits is 351–363 Ma (U–Pb zircon, TIMS, SIMS, LA–ICP–MS).
M. V. Luchitskaya, B. V. Belyatsky, E. A. Belousova, L. M. Natapov   +3 more
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The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland

Geosciences, 2018
Ferroan granitoid intrusions are rare in the Archaean rock record, but have played a large role in the evolution of the Proterozoic crust, particular in relation to anorthosite-mangerite-charnockite-granite suites. Here we discuss the petrogenesis of the
Tomas Næraa, Thomas F. Kokfelt, Anders Scherstén, Andreas Petersson   +3 more
doaj   +1 more source

U–Pb ages and Hf isotopic composition of zircons in Austrian last glacial loess: constraints on heavy mineral sources and sediment transport pathways [PDF]

International Journal of Earth Sciences, 2015
Loess sediments in Austria deposited ca. 30–20 ka ago yield different zircon age signatures for samples collected around Krems (SE Bohemian Massif; samples K23 and S1) and Wels (halfway between the Bohemian Massif and the Eastern Alps; sample A16). Cathodoluminescence (CL) imaging reveals both old, multistage zircons with complex growth histories and ...
Újvári, Gábor, Klötzli, Urs
openaire   +1 more source

Ancient depletion signals in lherzolites from forearc region: Constraints from Lu-Hf isotope compositions

Geoscience Frontiers, 2022
Abstract The sub-arc mantle that experienced hydrous melting is commonly characterized by refractory geochemical compositions. Nevertheless, minor lherzolites with fertile compositions have also been reported for mantle peridotites from subduction zone. The petrogenesis and mantle source of the lherzolites are still controversial.
Yang Xu, Chuan-Zhou Liu, Wei Lin, Xue-Fa Shi   +3 more
openaire   +1 more source