Results 201 to 210 of about 21,763 (249)

Petrological diversity of continental arc magmatism evidenced by Triassic magmatic complexes in East Kunlun Orogen. [PDF]

Sci Rep
Gan J, Wang W, Yan D, Zhou H, Xiong F, Zhou H, Li H.   +6 more
europepmc   +1 more source

Age of the Western Iron Ore Group, India, and implications for pre-GOE oxygenation of oceans at the twilight of Archean-Proterozoic transition. [PDF]

Sci Rep
Mukhopadhyay J, Ngobeli R, Ghosh G, Elburg MA.   +3 more
europepmc   +1 more source

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Zircon recrystallisation microstructures andthe implications for U-Pb dating

2021
<p>Uranium-lead dating of zircon has been used extensively in geochronological studies based on the widespread occurrence of zircon and its resistance to chemical and physical weathering. Previous research has shown that despite their apparent robustness, many zircons contain evidence for recrystallisation, such as the replacement of the ...
Jasper Huijsmans, Maartje Hamers, Martyn Drury, Jim Lee   +3 more
openaire   +2 more sources

Air abrasion experiments in U-Pb dating of zircon

Chemical Geology, 1986
Abstract Air abrasion of zircon grains can remove metamict material that has lost radiogenic Pb and zircon overgrowths that were added during younger events and thereby improve the precision of the age measurements and permit closer estimates of the original age.
S.S. Goldich, Lynn B. Fischer
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 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

Dating lacustrine carbonate strata with detrital zircon U-Pb geochronology

Geology, 2020
Abstract Carbonate lacustrine strata in nonmarine systems hold great potential for refining depositional ages through U-Pb dating of detrital zircons. The low clastic sediment flux in carbonate depositional environments may increase the relative proportion of zircons deposited by volcanic air fall, potentially increasing the chances of ...
Emily S. Finzel, Justin A. Rosenblume
openaire   +1 more source

Accuracy of Laser Ablation U‐Pb Zircon Dating: Results from a Test Using Five Different Reference Zircons

Geostandards and Geoanalytical Research, 2009
Using a state‐of‐the‐art 193 nm‐LA‐MC‐ICP‐MS system and with careful control of analytical procedures, the long term external reproducibility and accuracy of the ages Phanerozoic zircons measured over a period of months using calibrator bracketing for the 206Pb/238U and 207Pb/206Pb ages were ca.
Klötzli, Urs, Klötzli, Eva, Günes, Zekeriya, Kosler, Jan   +3 more
openaire   +2 more sources

U-Pb zircon dating of the lunar meteorite Dhofar 1442

Petrology, 2014
Dhofar 1442 is one of the few lunar KREEP-rich meteorites, which contains KREEP norites and KREEP gabbronorite as well as low-Ti basalts and highly evolved granophyres. Zircon is a typical accessory mineral of KREEP rocks. U-Th-Pb dates of 12 zircon grains (four of them were in two lithic clasts, and the others were fragments in the meteorite matrix ...
Demidova, S. I., Nazarov, M. A., Anosova, M. O., Kostitsyn, Yu. A., Ntaflos, Theodoros, Brandstaetter, F.   +5 more
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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