Results 221 to 230 of about 31,753 (257)

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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U–Pb zircon ages for the Rice Lake area, southeastern Manitoba

Canadian Journal of Earth Sciences, 1989
The Archean Rice Lake greenstone belt in southeastern Manitoba is made up of mafic to felsic volcanic rocks and associated intrusive and metasedimentary rocks. The belt is flanked to the north by the Wanipigow River granitic complex and to the south by the Manigotagan gneissic belt.
A. Turek, R. Keller, W. R. Van Schmus, W. Weber   +3 more
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Ion microprobe zircon U–Pb age and geochemistry of the Myanmar jadeitite

Journal of the Geological Society, 2008
Combined geochemistry and geochronology of the Myanmar jadeitite were determined. Bulk-rock trace element compositions display U-shaped REE patterns with pronounced positive Eu anomalies. The total REE abundances are very low, less than half chondritic, and the high field strength elements and some large ion lithophile elements are moderately enriched.
GUANGHAI SHI, WENYUAN CUI, SHUMIN CAO, NENG JIANG, PING JIAN, DUNYI LIU, LAICHENG MIAO, BINGBING CHU   +7 more
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Age of Aswan monumental granite, Egypt by U/Pb dating of zircon

Precambrian Research, 1978
The basement rocks of Aswan, Egypt, are among the best studied in the country. Its monumental granite has been dated by various techniques. Here, several suites of zircon separated from the monumental granite have been dated by the U–Pb method. A slight discordance is observed between U 238 /Pb 206 and U 235 /Pb 207 ages, and an average ages of 565 ...
A.A. Abdel-Monem, P.M. Hurley
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U-Pb zircon age of the Görbjörnarp syenite in Skåne, southern Sweden

Geologiska Föreningen i Stockholm Förhandlingar, 1991
Abstract Zircons were separated from a syenite body occurring along the Protogine Zone near Gorbjornarp in northeastern Skane, southern Sweden. U-Pb analyes of the zircons yield an almost concordant age of 1204+14 -8 (2σ) Ma. The MSWD is 0.740. The obtained age is interpreted as the intrusion age of the syenite.
Bent T. Hansen, Anders Lindh
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U–Pb zircon ages as a sediment mixing tracer in the Nepal Himalaya

Earth and Planetary Science Letters, 2005
This paper presents a new approach to quantify sediment mixing based on the mixing of U–Pb zircon age distributions within sediment. Two statistical techniques are presented to determine the proportion in which two known age distributions combine to create a known mixed age distribution.
W AMIDON, D BURBANK, G GEHRELS
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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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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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The U‐Pb zircon age of the Rödön rapakivi granite, central Sweden

GFF, 1994
Abstract The analytical data of U‐Pb multigrain analyses of zircons separated from a sample of rapakivi granite at Rodon, central Sweden, have been plotted in a concordia diagram and yield an upper intercept age of 1513±5Ma. This age is sligthly younger than the intrusive activity at 1590 to 1540 Ma of rapakivi granites in southwestern Finland and ...
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Provenance Studies in Tunisia by U-Pb Ages of Detrital Zircons: ABSTRACT

AAPG Bulletin, 1979
In recent years, with increasing availability of radiometric age determinations, age provinces in continental areas have become more clearly defined. Thus the possibility of establishing source areas for extensive sedimentary sequences by means of radiometric age determination of included detrital minerals is enhanced.
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