Results 131 to 140 of about 30,510 (167)

U-Pb zircon age of the Rostberget W-occurrence, northern Sweden

Geologiska Föreningen i Stockholm Förhandlingar, 1989
Anomalously U-rich granites of the so-called Revsund type, associated with W- and Sn-enrichments, occur in the Gunnarn area close to Storuman in northern Sweden.
Kjell Billström, Björn Öhlander
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U-Pb Zircon Age of Precambrian Basement Gneiss of South Korea

Geological Society of America Bulletin, 1973
A U-Pb zircon age of 2,150 m.y. confirms the middle Precambrian age for basement gneiss of South Korea.
H. E. GAUDETTE, P. M. HURLEY
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Provenance from zircon U–Pb age distributions in crustally contaminated granitoids

Sedimentary Geology, 2016
Abstract The basement of sedimentary basins is often entirely covered by a potentially multi-stage basin fill and therefore removed from direct observation and sampling. Melts intruding through the basin stratigraphy at a subsequent stage in the geological evolution of a region may assimilate significant volumes of country rocks.
Heinrich Bahlburg, Jasper Berndt
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Precambrian U-Pb zircon ages from Western Galicia(NW Spain)

Earth-Science Reviews, 1980
Abstract Zircon and monazite U-Pb ages are reported from two orthogneiss samples and one paragneiss from western Galicia. The three investigated suites of zircons reveal upper intercept ages of 2.2–2.5 Ga and lower intercept ages of about 470 Ma. The discordia pattern of the paragneiss is interpreted as resulting from lead loss of a detrital zircon ...
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Do U-Pb zircon ages from granulites reflect peak metamorphic conditions?

Geology, 1997
Granulite facies metamorphic events are constrained commonly through application of U-Pb zircon geochronometry. Zircon growth related to high-grade metamorphism is interpreted as reflecting the age of peak pressure-temperature ( P-T ) conditions. However, these ages obtained from granulites need to be interpreted with considerable care.
Malcolm P. Roberts, Fritz Finger
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UPb ages of zircons: A basic examination of error propagation

Chemical Geology: Isotope Geoscience section, 1987
Abstract The past three decades have seen a remarkable development and expansion of the UPb dating technique as applied to zircons. It is regrettable, however, that many otherwise sophisticated zircon studies lack even the most rudimentary error analysis for individual data points, despite the availability of published error programs, while others ...
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Solidification timescale for the Dufek Intrusion, Antarctica determined by U-Pb zircon ages

Geological Society of America Abstracts with Programs, 2019
<p>The 8-9 km thick Dufek layered mafic intrusion of Antarctica was emplaced at approximately 182 Ma associated with the Ferrar dolerites and the breakup of the supercontinent Gondwana.  It is rivaled in thickness only by the Bushveld Complex of South Africa and shows a similar progression in mineral compositions all
Jill VanTongeren, Aidan Taylor, Blair Schoene   +2 more
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Two high precision U–Pb zircon ages for the Sudbury Nickel Irruptive

Canadian Journal of Earth Sciences, 1982
Two independent U–Pb zircon ages were measured using norite samples from the North and South Ranges of the Sudbury Nickel Irruptive. Ages of [Formula: see text] and [Formula: see text] Ma were obtained with a probability of fit within experimental error of 51 and 57%, respectively.Previous determinations by the Rb–Sr whole-rock method gave ages ...
T. E. Krogh, R. H. McNutt, G. L. Davis
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UNMIXING DETRITAL ZIRCON U-PB AGE DISTRIBUTIONS

Geological Society of America Abstracts with Programs, 2017
Kurt E. Sundell, Joel E. Saylor
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CLASSIFYING DETRITAL ZIRCON U-PB AGE DISTRIBUTIONS USING MACHINE LEARNING

Geological Society of America Abstracts with Programs, 2022
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