Results 31 to 40 of about 668,632 (409)

Calibrating chemical abrasion: Its effects on zircon crystal structure, chemical composition and U Pb age

Chemical Geology, 2019
The present sub-permil precision of single zircon chemical abrasion, isotope-dilution, thermal ionisation mass spectrometry (CA-ID-TIMS) U Pb dates often reveals age dispersions that are outside of analytical uncertainty.
P. Widmann, J. Davies, U. Schaltegger
semanticscholar   +1 more source

U–Pb zircon ages from the Spontang Ophiolite, Ladakh Himalaya

Journal of the Geological Society, 2001
The Spontang Ophiolite in the Ladakh Himalaya consist of a thrust sheet of upper mantle and oceanic crustal rocks obducted onto the northern passive continental margin of India during the late Cretaceous. Precise isotopic ages of Himalayan ophiolites are presently unavailable. U–Pb dating of zircons from a dioritic segregation in the high-level gabbros
Pedersen, R, Searle, M, Corfield, R
openaire   +1 more source

A new U-Pb age for shock-recrystallised zircon from the Lappajärvi impact crater, Finland, and implications for the accurate dating of impact events

Geochimica et Cosmochimica Acta, 2019
Accurate and precise dating of terrestrial impact craters is a critical requirement for correlating impacts with events such as mass extinctions. A number of isotopic systems have been applied to impact chronology but it is important to understand what ...
G. Kenny, M. Schmieder, M. Whitehouse, A. Nemchin, L. Morales, E. Buchner, J. Bellucci, J. Snape   +7 more
semanticscholar   +1 more source

The effect of low-temperature annealing on discordance of U–Pb zircon ages [PDF]

Scientific Reports, 2021
AbstractDiscordant U–Pb data of zircon are commonly attributed to Pb loss from domains with variable degree of radiation damage that resulted from α-decay of U and Th, which often complicates the correct age interpretation of the sample. Here we present U–Pb zircon data from 23 samples of ca.
Herrmann, Maria, Soderlund, Ulf, Schersten, Anders, Naeraa, Tomas, Holm-Alwmark, Sanna, Alwmark, Carl   +5 more
openaire   +5 more sources

Age and origin of fluorapatite-rich dyke from Baranec Mt. (Tatra Mts., Western Carpathians): a key to understanding of the post-orogenic processes and element mobility

Geologica Carpathica, 2016
On the southeastern slope of the Baranec Mount in the Western Tatra Mountains (Slovakia) an apatite-rich pegmatite-like segregation was found in the subvertical fault zone cutting metapelitic rocks.
Gawęda Aleksandra, Szopa Krzysztof, Chew David, Klötzli Urs, Müller Axel, Sikorska Magdalena, Pyka Paulina   +6 more
doaj   +1 more source

Crustal evolution of the western part of the Archean Gavião Block, São Francisco Craton, based on U-Pb, Sm-Nd and Rb-Sr evidence [PDF]

Geologia USP. Série Científica, 2013
The western part of the Gavião Block (São Francisco Craton) is one of the oldest fragments of the South American Platform. It comprises the Riacho de Santana Gneissic Migmatitic complex, the Santa Isabel complex and the Riacho de Santana greenstone belt.
Natali da Silva Barbosa, Wilson Teixeira, Luiz Rogério Bastos Leal, Angela Beatriz de Menezes Leal   +3 more
doaj   +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

In situ U-Pb Dating of Calcite from the South China Antimony Metallogenic Belt

iScience, 2020
Summary: Accurately determining the age of hydrothermal ore deposits is difficult, because of lack of suitable mineral chronometers and techniques. Here we present the first LA-MC-ICPMS U-Pb age of carbonates from hydrothermal Sb deposits.
Kai Luo, Jia-Xi Zhou, Yue-Xing Feng, I. Tonguc Uysal, Ai Nguyen, Jian-Xin Zhao, Jiawei Zhang   +6 more
doaj   +1 more source

U–Pb ages of angrites

Geochimica et Cosmochimica Acta, 2008
Abstract Precise U–Pb ages, determined with double spike ( 202 Pb– 205 Pb) thermal ionization m1ass spectrometry, are reported for angrites Angra dos Reis (AdoR), Lewis Cliff 86010 (LEW), and D’Orbigny. Nineteen of 23 acid-washed pyroxene fractions from these meteorites and whole rock fractions from D’Orbigny contain between 0.5 and 1.3 pg of total ...
openaire   +2 more sources

Spatial and glacial‐interglacial variations in provenance of the Chinese Loess Plateau

Geophysical Research Letters, 2012
The Chinese Loess Plateau (CLP) covers an extensive area over 440,000 km2and provides an unprecedented terrestrial record of Neogene climate. However, it is still unclear whether the provenance of these loess deposits is uniform or contains spatial and ...
Guoqiao Xiao, Keqing Zong, Gaojun Li, Zhaochu Hu, Guillaume Dupont‐Nivet, Shuzhen Peng, Kexin Zhang   +6 more
doaj   +1 more source