U-Pb
U Pb zircon ages for Yarlung Tsangpo suture zone ophiolites, southwestern Tibet and their tectonic implications
... new U – Pb zircon ages for fi ve different massifs of the YTSZ ophiolites from southeastern to southwestern Tibet (Luobusa, Xigaze, Dangxiong, Jungbwa and ...
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Chemical Abrasion Applied to LA ICP MS U Pb Zircon Geochronology
... The 91500 zircon reference material is thought to have come from a syenite pegmatite near Kuehl Lake in Ontario, Canada. The original sample consisted of a single 238 g crystal, part of which was split into a large ...
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SHRIMP U-Pb xenotime geochronology and its application to dating mineralisation, sediment deposition and metamorphism
... Three application studies of SHRIMP U-Pb xenotime geochronology using the matrix correction procedures developed were undertaken as a part of this study as well as a SHRIMP U-Pb detrital[r] ...
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U Pb LA ICPMS dating using accessory mineral standards with variable common Pb
... 207 Pb-corrected age of 1797 ± 24 Ma with no discernible age variation from core to rim while the larger grain (grain C) shows a pronounced age variation with 207 Pb-corrected ages as old as 2022 Ma in the ...
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SHRIMP U Pb and U Pb Laser Ablation Geochronological on Zircons from Monte Santo Alkaline Intrusive Suite, Westhern Araguaia Belt, Tocantins State, Brazil
... In situ U-Pb analyses were performed on a SHRIMP-II instrument in the Center of Isotopic Research (CIR) at VSEGEI, Saint Petersburg, Russia. The results were obtained with a secondary electron multiplier in ...
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Zircon U-Pb geochronology of the Great Valley Group : recalibrating the lower cretaceous time scale
... different from those of GTS2004 by up to 12m.y. (Fig. 1.1), on the basis of K-Ar glauconite ages supplemented with cyclostratigraphy in the Vocontian basin, France. Several studies following this work, however, raised ...
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ELA ICP MS U Pb zircon geochronology of regional volcanism hosting the Bajo de la Alumbrera Cu Au deposit: implications for porphyry related mineralization
... A clinopyroxene-phyric basaltic andesite monomictic breccia is the stratigraphically lowest zircon-bearing volcanic unit in the district. It occurs only 100 to 150 m from the base of the basaltic peperitic sills and ...
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Tracking exhumation and drainage divide migration of the western Alps: a test of the apatite U Pb thermochronometer
... apatite U-Pb thermochronometer, in combination with the commonly used AFT and zircon U-Pb tech- niques, by means of routine LA-ICP-MS analy- sis (Thomson et ...apatite U-Pb ...
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Slope Year for the U Pb Dating Method and Its Applications
... [26] Aleinikoff, J.N., Lack, J.F.S., Lund, K., Evans, K.V., Fanning, C.M., Mazdab, F.K., et al. (2012) Constraints on the Timing of Co-Cu Au Mineralization in the Blackbird District, Idaho, Using SHRIMP ...
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Deciphering the geochronology of a large granitoid pluton (Karkonosze Granite, SW Poland): an assessment of U Pb zircon SIMS and Rb Sr whole rock dates relative to U Pb zircon CA ID TIMS
... 206 Pb and 207 Pb/ 235 U ratios have poor ...in U-Pb systematics (Wetherill 1956), is blurred and the calculated ages can be biased either towards spuriously young dates by ...
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The origin of the Palaeoproterozoic AMCG complexes in the Ukrainian Shield : new U Pb ages and Hf isotopes in zircon
... Figure 10. Diagram showing mantle compositional components for ferromonzodioritic dykes and chilled margins of gabbroic intrusions of the Korosten plutonic complex and for Ni-bearing tholeiitic dykes and layered ...
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U Pb and Th Pb dating of apatite by LA ICPMS
... 1996). U-Pb zircon determinations from weakly to undeformed rocks in the Lyon Mountain gneiss yield ages of ...a U-Pb zircon age of ...Several U/Pb garnet and sphene ages from ...
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Geochemistry, Nd, Pb and Sr Isotope Systematics, and U-Pb zircon ages of the Neoarchean Bad Vermilion Lake Greenstone Belt and Spatially Associated Granitic rocks, Western Superior Province, Canada
... My sincerest thanks and gratitude must foremost be extended to Dr. Ali Polat for his patient mentorship, enthusiastic encouragement, and, most of all, his thorough, insightful, and constructive criticism–all of which ...
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Apatite : a U Pb thermochronometer or geochronometer?
... distinct U-enriched rims and its U-Pb apparent ages correlate with Mn chemistry, with a high Mn group yielding an age of ...The U-Pb and trace element chemistry and morphology support ...
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Do U/Pb SHRIMP Dating and Pb Stepwise Leaching (PbSL) Analyses Confirm the Lack of Precambrian Basement Outcrops in Thailand?
... of U/Pb SHRIMP data of regional importance for the high-grade metamorphic crystalline basement of ...modern U/Pb geochronology was spatially restricted to the Khlong Marui shear zone ([6], ...
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Quantifying exhumation at the giant Pulang porphyry Cu Au deposit ssing U Pb He dating
... al., 2015, 2016), orogenic-type Au deposits (Zeng et al., 2013; Liu et al., 2017), and diamondiferous kimberlite occurrences (e.g., McInnes et al., 2009; Evans et al., 2013). McInnes et al. (2005a, b) performed apatite ...
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U Pb detrital zircon geochronology of the lower Danube and its tributaries; implications for the geology of the Carpathians
... Ducea, M.N. and Giosan, L. and Carter, Andrew and Stoica, A.M. and Relu, D.R. and Balica, C. and Balintoni, I. and Filip, F. and Petrescu, L. (2018) U-Pb detrital zircon geochronology of the lower Danube ...
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Shrimp U-Pb Ages of Detrital Zircons in Sargurs
... ' We presented SEM photographs (Chadwick et al., Fig. 3, 1986) which show that zircon grains from the Sargur chromite-bearing fuchsite quartzites at Banavara and fr[r] ...
9
Fingerprinting Proterozoic bedrock in interior Wilkes Land, East Antarctica
... of xenocrystic zircon suggests at least two isotopically different components in the source: the less radiogenic xenocrysts (c. 1526–1464 Ma; sample CI-814B) overlap in age and Hf signature with zircon from the Coompana ...
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Sequencing planetary accretion using chronology of ungrouped achondrites
... the U-Pb, Al-Mg, Mn-Cr and Hf-W isotopic systems (for a detailed discussion on radio chronometer dating in meteorites see Wadhwa et al (2014) and Davis and Mckeegan ...the U-Pb ...the ...
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