Results 121 to 130 of about 1,303 (163)

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
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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
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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
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Provenance of Carboniferous sandstones from U–Pb dating of detrital zircons

Nature, 1987
One of the major problems of North Atlantic palaeogeographical development is the origin and source of the drainage system that deposited, during the Carboniferous, up to 5 km of clastic sediments across an east–west belt from western Ireland to western Poland. We present here results from U–Pb dating of detrital zircons In Namurian (mid-Carboniferous)
Sarah Drewery, R. A. Cliff, M. R. Leeder
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U–Pb zircon dating of the Hoting gabbro, north central Sweden

GFF, 2003
Abstract The Hoting gabbro, located in the northern part of Jamtland County, is one of the largest layered mafic intrusions in Sweden. The rounded, main part of the intrusion has the shape of a funnel, in which the magmatic layering is concentrically developed with steeply dipping outer layers, and flat layering in the central part.
Fredrik A. Hellström, Sven Åke Larson
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Precise U–Pb zircon dates from the Avalon Terrane in Newfoundland

Canadian Journal of Earth Sciences, 1988
The following new U–Pb dates are provided for zircons from volcanic and intrusive rocks of the Avalon Terrane of Newfoundland: Burin Group ophiolite (Wandsworth pegmatitic gabbro), [Formula: see text]; Marystown Group ash-flow tuff, [Formula: see text]; Rock Harbour Group rhyolite clast in conglomerate, [Formula: see text]; Harbour Main Group ash-flow
T. E. Krogh, D. F. Strong, S. J. O'Brien, V. S. Papezik   +3 more
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U-Pb SHRIMP dating of zircons from metamorphic complexes in eastern Kamchatka

Russian Journal of Pacific Geology, 2012
The metamorphic complexes of eastern Kamchatka exposed on the Khavyven Highland and Karaginsky Island, as well as on the Kamchatka and Ozernoi peninsulas, compose large (up to 1.5 km) elongated blocks spatially associated with ophiolitic peridotite and gabbroic rock bodies (the Khavyven Highland and Karaginsky Island) or make up isolated fragments and ...
I. A. Tararin, Z. G. Badredinov, B. A. Markovsky, B. I. Slyadnev   +3 more
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Age constraint on Burmese amber based on U–Pb dating of zircons

Cretaceous Research, 2012
Amber from northern Myanmar has been commercially exploited for millennia, and it also preserves the most diverse palaeobiota among the worlds' seven major deposits of Cretaceous amber. Recent estimated ages vary from Albian to Cenomanian, based on palynology, an ammonoid, and Mesozoic insect taxa preserved within the amber. The burmite-bearing rock is
Guanghai Shi, David A. Grimaldi, George E. Harlow, Jing Wang, Jun Wang, Mengchu Yang, Weiyan Lei, Qiuli Li, Xianhua Li   +8 more
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U–Pb dating of stockwork zircons from the eastern Iberian Pyrite Belt

Journal of the Geological Society, 1999
Zircons found in the stockwork zones of the massive sulphide Los Frailes deposit, Iberian Pyrite Belt, are interpreted to have grown during the hydro-thermal alteration of host felsic volcanic rocks. Ion microprobe (SHRIMP) dating gives a 206 Pb/ 238 U age of 345.7 ± 4.6 Ma (2σ) and together ...
Nesbitt, R.W., Pascual, E., Fanning, C.M., Toscano, M., Saez, R., Almodovar, G.R.   +5 more
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