Results 161 to 170 of about 1,365 (198)
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Joint Compositional Calibration: An Example for U–Pb Geochronology
2016This contribution explores several issues arising in the measurement of a (geo)chemical composition with Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS), specially in the case that the quantities of interest are linear functions of (log)-ratios.
R. Tolosana-Delgado +4 more
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U/Pb geochronology of the Coney Head Complex, Newfoundland
Canadian Journal of Earth Sciences, 1987The Coney Head Complex, White Bay, Newfoundland, comprises allochthonous plutonic rocks and deformed equivalents emplaced over the continental margin during the Ordovician Taconic Orogeny. A U/Pb zircon age of 474 + 2 Ma for tonalite considered as having formed by partial melting in an island arc, indicates that it crystallized in Arenig time.
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Applications of High-Precision U-Pb Geochronology
The perpetual and persistent forward march of time is a geoscientist’s reference frame for understanding Earth’s natural changes that manifest in all scales of natural materials (e.g., minerals, fossils, glaciers, rocks, mountain belts, cratons). While indicators of relative timing can be abundant in natural materials (e.g.openaire +1 more source
Alpha-recoil in U?Pb geochronology: effective sample size matters
Contributions to Mineralogy and Petrology, 2003Displacement of the daughter isotope by α-recoil results in an open system on the nanoscale. For a heterogeneous distribution of U and Th, this redistribution of intermediate and stable daughter isotopes results in subvolumes with a deficit of Pb and others with an excess of Pb.
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U–Pb geochronology of the Coldwell Complex, northwestern Ontario, Canada
Canadian Journal of Earth Sciences, 1985The Coldwell Complex gives a U–Pb zircon age of 1188 ± 56 Ma, a U–Pb tritomite age of 1126 ± 6 Ma, and a Pb–Pb potash feldspar age of 1139 ± 55 Ma. These ages are all significantly older than the previously published Rb–Sr and K–Ar ages. We interpret these ages as follows: (1) emplacement of the complex at 1188 Ma as part of the initial stages of the ...
A. Turek +2 more
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An improved micro-capsule for zircon dissolution in UPb geochronology
Chemical Geology: Isotope Geoscience section, 1987A new design of Teflon® micro-capsule for mineral dissolution is described which offers advantages over the conventional Krogh vessel for use in zircon UPb geochronology. The TFE Teflon® capsules have friction-fit caps and are intended to reside inside a larger Teflon® pressure vessel.
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In-situ U Pb geochronology of vesuvianite in skarn deposits
Chemical Geology, 2022Yu Zhang +11 more
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High-Precision U-Pb Zircon Geochronology and the Stratigraphic Record
Reviews in Mineralogy and Geochemistry, 2003The rock stratigraphic record exists as a rich, albeit complex and incomplete repository of Earth history, tracing the processes of biological evolution, climate change, oceanic and atmospheric chemistry, sea-level fluctuations, mountain-building and erosion, and basin subsidence. Without a detailed and precise temporal framework, however, the richness
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Towards a more accurate U–Pb geochronology
Chemical Geology, 2001Desmond E Moser, David J Scott
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Ch3 U-Pb Detrital Zircon Geochronology Datasets
This file contains all U-Pb zircon geochronology results collected at the University of Arizona - Laserchron Center and Washington State University Detailed datasets include laser settings and counts per second for each analysis See summary for all U-Pb detrital zircon analyses for GPS, geographic location, and sample name.openaire +1 more source