Results 21 to 30 of about 163,795 (290)

U–Pb dating and Sm–Nd isotopic analysis of granitic rocks from the Tiris Complex : new constaints on key events in the evolution of the Reguibat Shield, Mauritania [PDF]

, 2012
The Reguibat Shield of N Mauritania and W Algeria represents the northern exposure of the West African Craton. As with its counterpart in equatorial West Africa, the Leo Shield, it comprises a western Archaean Domain and an eastern Palaeoproterozoic ...
Abdouloye, T.B., Darbyshire, F., Gillespie, M., Horstwood, M.S.A., O'Connor, E.A., Pitfield, P.E.J., Schofield, D.I.   +6 more
core   +1 more source

Adjustment of small-span masonry arch bridges to present-day demands

Građevinar, 2014
An overview of deterioration mechanisms and damage to masonry arch bridges, methods for inspection of existing structures, and conservative and sophisticated assessment methods, is presented in this paper.
Alex Kindij, Ana Mandić Ivanković, Marin Vasilj   +2 more
doaj   +1 more source

Effect of Gas Flow Rates in Laser Ablation System on Accuracy and Precision of Zircon U-Pb Dating Analysis by LA-ICP-MS

Yankuang ceshi, 2022
BACKGROUND Despite zircon U-Pb dating analysis by LA-ICP-MS receiving wide acceptance, it remains a challenge to obtain results with high accuracy and precision.
TAN Xijuan, GUO Chao, FENG Yonggang, ZHOU Yi, LIANG Ting   +4 more
doaj   +1 more source

Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica [PDF]

, 2009
New whole rock Rb-Sr and zircon U-Pb geochronological data and Sm-Nd isotopic data are presented from the central magmatic arc domain of the Antarctic Peninsula in the area of northwest Palmer Land and southwest Graham Land, Rb-Sr isochrons indicate an ...
Flowerdew, Michael, Leat, Philip, Millar, Ian, Riley, Teal, Scarrow, J.H., Whitehouse, M.J.   +5 more
core   +1 more source

U-Pb geochronology at 100ppm age uncertainty [PDF]

Goldschmidt2021 abstracts, 2021
n ...
Schaltegger, Urs, Greber, Nicolas, Ovtcharova, Maria, Gaynor, Sean, Schoene, Blair, Wotzlaw, Jörn-Frederik, Davies, Joshua, Farina, Federico   +7 more
openaire   +2 more sources

Timing of the magmatism of the paleo-Pacific border of Gondwana: U-Pb geochronology of Late Paleozoic to Early Mesozoic igneous rocks of the north Chilean Andes between 20° and 31°S [PDF]

, 2014
Indexación: Web of Science; ScieloABSTRACT. U-Pb zircon geochronological data provide record of about 130 Ma of igneous activity in the Andes of northern Chile, which extended episodically from the latest Early Carboniferous to Early Jurassic (328-194 Ma)
Maksaev, Víctor, Munizaga, Francisco, Tassinari, Colombo   +2 more
core   +1 more source

Detrital zircon geochronology of Paleoproterozoic metasedimentary rocks from Jämsä, Central Finland [PDF]

Bulletin of the Geological Society of Finland
In this short communication, we present new detrital single grain zircon U-Pb data for six metasedimentary rock samples from Jämsä, Central Finland.
Perttu Mikkola, Matti Kurhila, Hannu Huhma   +2 more
doaj   +1 more source

NanoSIMS and EPMA dating of lunar zirconolite

Progress in Earth and Planetary Science, 2021
Zirconolite is a common Zr-rich accessary mineral in mafic rocks. It is also an ideal U–Pb/Pb–Pb chronometer because it commonly contains high U content (mostly 0.1–10 wt%) and negligible initial Pb.
Nian Wang, Qian Mao, Ting Zhang, Jialong Hao, Yangting Lin   +4 more
doaj   +1 more source

Pressure, temperature and time constraints on tectonic models for southwestern Sweden [PDF]

, 2010
In this work, a number of key localities have been investigated in detail in order to provide precise constraints on models for the tectonic evolution of southern Sweden.
Austin Hegardt, Eric
core   +1 more source

High-Precision U-Pb Zircon Age Calibration of the Global Carboniferous Time Scale and Milankovitch Band Cyclicity in the Donets Basin, Eastern Ukraine [PDF]

, 2010
High-precision ID-TIMS U-Pb zircon ages for 12 interstratified tuffs and tonsteins are used to radiometrically calibrate the detailed lithostratigraphic, cyclostratigraphic, and biostratigraphic framework of the Carboniferous Donets Basin of eastern ...
Aisenverg, Aisenverg, Aisenverg, Aizenverg, Aizenverg, Alekseev, Algeo, Barrick, Barrick, Barskov, Belka, Birgenheier, Black, Boardman, Brazhnikova, Briand, Burger, Chekunov, Chernov'yants, Chernykh, Chernykh, Chesnut, Condon, Cozar, Davydov, Davydov, Davydov, Davydov, Davydov, Davydov, Davydov, Davydov, Davydov, Davydov, Devuyst, Devuyst, Dickinson, Ellison, Fisunenko, Fohrer, Gastaldo, Gerstenberger, Goreva, Grozdilova, Haq, Heckel, Heckel, Heckel, Heckel, Heckel, Heckel, Hess, Hess, Inosova, Isakova, Ivanova, Izart, Izart, Izart, Izart, Jaffey, James L. Crowley, Kabanov, Kagarmanov, Khodjanyazova, Kireeva, Klein, Klein, Kozitskaya, Krogh, Kuiper, Kulagina, Kullmann, Lebedev, Levenshtein, Lutugin, Makhlina, Mark D. Schmitz, Mattinson, Menning, Milanovsky, Min, Montanez, Mundil, Nemirovskaya, Nemirovskaya, Nemyrovska, Nemyrovska, Nikitin, Nikolaeva, Pazukhin, Poletaev, Poletaev, Poty, Poulsen, Putrja, Ramezani, Rasbury, Rauser-Chernousova, Rauser-Chernousova, Renne, Ritter, Ross, Rotai, Savchuk, Schellwien, Schmitz, Schmitz, Shchegolev, Shchegolev, Skompski, Somerville, Soreghan, Soreghan, Stovba, Stovba, Tschernyshev, Vdovenko, Vdovenko, Vdovenko, Villa, Villeneuve, Vladimir I. Davydov, Vladislav I. Poletaev, Wang, Wanless, Wardlaw, Zaritskiy, Zhemchuzhnikov   +128 more
core   +2 more sources