Results 241 to 250 of about 85,116 (273)

U-Pb geochronology of exposed basement rocks in Oklahoma

Geological Society of America Bulletin, 1979
U-Pb measurements on zircons separated from Precambrian basement rocks from Oklahoma yield the following: (1) the Spavinaw Granite, which appears in outcrops in Mayes County, northeastern Oklahoma, is 1,370 ± 20 m.y. old; (2) the ages of rocks exposed in the eastern Arbuckle Mountains in southeastern Oklahoma are: Tishomingo Granite, 1,374 ± 15 m.y ...
M. E. BICKFORD, RICHARD D. LEWIS
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U/Pb geochronology of the Coney Head Complex, Newfoundland

Canadian Journal of Earth Sciences, 1987
The 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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Revolution and Evolution: 100 Years of U-Pb Geochronology

Elements, 2013
U–Pb geochronology has its roots in a spectacular decade of discovery. Within about ten years of the discovery of radioactivity in 1896, old ideas about the nature of matter were overthrown and the seeds of geochronology were planted. After giants of physics like Ernest Rutherford moved on to other research, Arthur Holmes nurtured the new field of ...
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A new method integrating high-precision U–Pb geochronology with zircon trace element analysis (U–Pb TIMS-TEA)

Geochimica et Cosmochimica Acta, 2010
Increased precision in isotope-dilution thermal ionization mass spectrometry (ID-TIMS) U–Pb geochronology has revealed age complexities in zircon populations that require new tools for understanding how the growth of zircon is related to geologic processes.
Schoene, B., Latkoczy, C., Schaltegger, Urs, Günther, D.   +3 more
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Joint Compositional Calibration: An Example for U–Pb Geochronology

2016
This 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, K. G. van den Boogaart, E. Fišerová, K. Hron, I. Dunkl   +4 more
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In situ calcite U−Pb geochronology by high-sensitivity single-collector LA-SF-ICP-MS

Science China. Earth Sciences, 2022
Shitou Wu, Yueheng Yang, N. Roberts, Ming Yang, Hao Wang, Zhongwu Lan, Bohang Xie, Tianyi Li, Lei Xu, Chaoyu Huang, Liewen Xie, Jinhui Yang, Fuyuan Wu   +12 more
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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.
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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.
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First steps of LA-ICPMS U-Pb magnetite geochronology

It is well known that the density of metamorphic reactions occurring in subduction zones, due to intense fluid-melt activity, is very high. One of the minerals resulting from all these reactions, present both in the downgoing slab and in the serpentinized mantle wedge, is magnetite.
Aratz Beranoaguirre, Alexandre Peillod, Clifford Patten, Istvan Dunkl, Simon Hector, Uwe Ring, Jochen Kolb, Axel Gerdes   +7 more
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U–Pb, Pb–Pb and Re–Os sulphide geochronology

2016
The U–Pb decay scheme is the most widely applied geologically robust geochronometer. Due to its unique attribute of containing two independent decay chains, starting from different parent isotopes and finishing with different daughter isotopes of the same elements, it is possible to cross-correlate the data obtained simultaneously to produce routine ...
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