Results 231 to 240 of about 5,011,359 (270)

Ion microprobe U–Pb dating of apatite

Chemical Geology, 1999
Abstract To illustrate in situ Sensitive High Resolution Ion MicroProbe (SHRIMP) analysis of apatites, Pb isotopes and Pb/U ratios of five apatite samples with different ages have been measured using SHRIMP II ion microprobe at Hiroshima University.
Yuji Sano, Takayuki Oyama, Kentaro Terada, Hiroshi Hidaka   +3 more
openaire   +1 more source

U–Pb dating of andradite-rich garnet by SIMS

Journal of Analytical Atomic Spectrometry, 2022
The SIMS U–Pb dating method for andradite-rich garnet with the andradite composition ranging from 52 to 95 mol% was developed.
Yong-Shu Huang, Wen-Hao Zhao, Yu Liu, Yue-Heng Yang, Guo-Qiang Tang, Yang Li, Xian-Hua Li, Han Zhao, Qiu-Li Li   +8 more
openaire   +1 more source

U‐Pb zircon dating of Stockholm granite at Frescati

GFF, 1995
Abstract U‐Pb zircon dating of a sample of grey Stockhohn granite from Frescati just north of Stockholm yielded an upper intercept age of 1803+23 ‐19 Ma, similar to earlier age determinations, and interpreted as the age of crystallization of the granite. Ivarsson, C. & Johansson, A., 1995: U‐Pb zircon dating of Stockholm granite at Frescati.
Carin Ivarsson, Åke Johansson
openaire   +1 more source

An assessment of the utility of staurolite in U-Pb dating of metamorphism

Contributions to Mineralogy and Petrology, 1997
Pb isotope data, major and trace element compositions, fission track and synchrotron X-ray fluorescence analyses are presented for staurolites from nine pelitic schists in the continental United States to evaluate their potential use in U-Pb geochronology.
Antonio Lanzirotti, Gilbert N. Hanson
openaire   +1 more source

Direct U–Pb dating of vitrinite in coal

Chemical Geology
Uranium is often associated with organic matter forming U-organic matter complexes. Coal, as an organic rich material, is no exception but can it be dated using the uranium‑lead (U–Pb) method? We present U–Pb isotopic data, and trace elements concentrations directly measured on particles of the coal maceral vitrinite.
Sun, Beilei, Feng, Yuexing, Rodrigues, Sandra, Allen, Charlotte M., Esterle, Joan S.   +4 more
openaire   +3 more sources

U-Pb zircon dating of the Gruf Complex

2012
Permian granulites associated with noritic intrusions and websterites are a common feature of the post-Variscan European crust. Such granulites are common in the Southern Alps (e. g. Ivrea Zone), but occur only in the Gruf Complex in the Central Alps. To understand the geotectonic significance of these granulites, in particular in the context of Alpine
Galli, Andrea, Le Bayon, Benjamin, Schmidt, Max W., Burg, Jean-Pierre, Reusser, Eric, Sergeev, Sergey, Larionov, Alexander   +6 more
openaire   +1 more source

NanoSIMS imaging method of zircon U-Pb dating

Science China Earth Sciences, 2016
We report an imaging method of zircon U-Pb dating with NanoSIMS 50L, which overcomes the significant U-Pb fractionation as the pit was sputtered deeper during conventional spot mode analysis and can be applied to irregular small grains or heterogeneous areas of zircon.
Sen Hu, YangTing Lin, Wei Yang, Wei-RZ Wang, JianChao Zhang, JiaLong Hao, WeiFan Xing   +6 more
openaire   +1 more source

U-Pb Dating of Zircon and 40Ar/39Ar Dating of Biotite at Bingham, Utah

Economic Geology, 2001
Uranium-lead dating of zircon and 40Ar/39Ar dating of biotite provide a new estimate of the age of the Bingham hydrothermal system. The U-Pb age of zircon from the Last Chance monzonite establishes the age of crystallization of this intrusion at 38.55 ± 0.19 Ma (2 σ , MSWD = 2.08). The oldest hydrothermal event in the monzonite is dated at 38.40 ± 0.16
W. T. Parry, P. N. Wilson, D. Moser, M. T. Heizler   +3 more
openaire   +2 more sources

Does U–Pb date Earth's core formation?

Nature, 2006
Arising from: B. J. Wood & A. N. Halliday Nature 437, 1345–1348 (2005); Wood & Halliday reply Constraining the timing of the formation of Earth's core, which defines the birth of our planet, is essential for understanding the early evolution of Earth-like planets.
Qing-zhu Yin, Stein B. Jacobsen
openaire   +1 more source

UPb dating of a carbonate subaerial exposure event

Earth and Planetary Science Letters, 1995
Ten samples of the dolomite fraction from the Lower Ordovician Oneota Formation, directly below the Sauk-Tippecanoe unconformity in Wisconsin, define a 238U206Pb age of 504 ± 14 Ma (MSWD = 190, 206Pb204Pb = 27–85, 238U204Pb = 84–795), which is in agreement with the 500 ± 4 Ma depositional age based on conodont biostratigraphy.
Bryce L. Winter, Clark M. Johnson
openaire   +1 more source