U/Pb ages
SHRIMP zircon U–Pb ages from coal beds across the Permian–Triassic boundary, eastern Yunnan, southwestern China
... these U e Pb ages include the time period of the onset of the mass extinction at ...new ages represent not only the first and closest ages to the PTB mass extinction in terrestrial coal ...
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New detrital zircon U Pb ages from BIF related metasediments in the Ntem Complex (Congo craton) of southern Cameroon, West Africa
... these ages with the Group C zir- cons of this study possibly explains their ...younger ages (990 Ma, 1200 Ma, 1400 Ma, 1540 Ma) have been reported by [68] on detrital zircons in diamictites from the Puga ...
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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] ...
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The origin of the Palaeoproterozoic AMCG complexes in the Ukrainian Shield : new U Pb ages and Hf isotopes in zircon
... of U-Pb zircon and baddeleyite dating of 16 samples from the Korosten plutonic complex (KPC), and 6 samples from the Korsun-Novomyrhorod plutonic complex ...
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High-precision U–Pb ages in the early Tithonian to early Berriasian and implications for the numerical age of the Jurassic–Cretaceous boundary
... precision U–Pb age determinations using chemical abrasion– isotope dilution–thermal ionization mass spectrometry (CA- ID-TIMS) techniques to date zircon from interbedded vol- canic ash layers in the Las ...
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Early Proterozoic U Pb Zircon Ages from Basement Gneiss at the Solovetsky Archipelago, White Sea, Russia
... its U-Pb zircon age coincide with gran- itic intrusions observed for the western BMB at ...a U-Pb zircon age of ...Potassium-Ar ages of the granites reported by [7] range from ...
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U Pb zircon ages for Yarlung Tsangpo suture zone ophiolites, southwestern Tibet and their tectonic implications
... The southwestern Tibetan ophiolites form a 300-km-long discontin- uous belt, dominated by three major massifs (from east to west): the Dangxiong, Jungbwa (Yungbwa) and Kiogar massifs (Fig. 3). These mas- sifs occur c. 20 ...
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Insights into the evolution of The Hindu Kush Kohistan Karakoram from modern river sand detrital geo and thermochronological studies
... The detrital zircon U-Pb ages from modern river sediments of Indus tributaries MRS 2,.. compiled published bedrock data from the source terranes..[r] ...
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Tectonic evolution of the Ailaoshan Fold Belt in southwestern Yunnan, China
... zircon U–Pb ages are used to determine the maximum deposition ages for sedimentary rocks ...deposition ages of the Ailaoshan sandstones are expected to be within a few million years of ...
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Tracking exhumation and drainage divide migration of the western Alps: a test of the apatite U Pb thermochronometer
... (Schwartz et al., 2012). We therefore agree with Evans and Mange-Rajetzky (1991) in identi- fying the Parpaillon nappe of the Embrunais- Ubaye nappes as the source of the low-grade serpentinite of the Grès Verts unit. We ...
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Silicic ash beds bracket Emeishan Large Igneous Province to < 1 m y at ~ 260 Ma
... 238 U ages of 318-282 Ma, three yield 206 Pb/ 238 U ages of 869-752 Ma and three yield 207 Pb/ 206 Pb ages of 2166-1521 Ma, significantly older than the majority of ...
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U Pb and Th Pb dating of apatite by LA ICPMS
... yield U-Pb and Th-Pb ages which are in general consistent with independent estimates of the U-Pb apatite age, which demonstrates the suitability of the both analytical protocol ...
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Detrital zircon geochronologic tests of the SE Siberia-SW Laurentia paleocontinental connection
... zircon U-Pb age ...to U- Pb date them at the Stanford University-US Geological Sur- vey SHRIMP facility and at the LAICPMS facility at Wash- ington State ...equivalent Pb-Pb ...
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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
... and U contents (178-702 ppm) (Table 2.3). The ratios Th/U vary from ...207 Pb/ 206 Pb mean age of 2664±15 Ma ...207 Pb/ 206 Pb age (2868 Ma) and larger standard age deviation (1σ ...
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Apatite : a U Pb thermochronometer or geochronometer?
... given Pb-in-apatite diffusion and spherical geometry characteristics (Cherniak, 2005; Cherniak et ...affecting U-Pb dates (Bingen et ...apparent ages and chemistry, where new rim growth ...
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Evidence for ca. 2046 Ma high-grade metamorphism in Paleoproterozoic metasedimentary rocks of the northern Borborema Province, NE Brazil: constraints from U-Pb (LA-ICP-MS) zircon ages
... zircon ages of 1971±40 Ma and 1997±20 Ma obtained from a high-grade metamorphic supracrustal sequence of the southern São Francisco Craton (Teixeira et ...metamorphic ages of 2015-1960 Ma ...
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Maximising data and precision from detrital zircon U Pb analysis by LA ICPMS: The use of core rim ages and the single analysis concordia age
... regional U-Pb detrital zircon datasets, one from the Banda Arc in Eastern Indonesia and one from the European Alps pro-foreland ...presenting U-Pb data, which is currently under-utilised in ...
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Frazer_unc_0153D_17286.pdf
... by U-Pb in zircon, finding that emplacement of the Tuolumne Intrusive Suite in the Sierra Nevada batholith spanned a ~10 Ma period, and a single pluton was intruded over at least 4 ...
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Autonomy, de facto and de jure
... to U +6 , and it is easily mobilized because of its high stability as uranyl phosphate ionic complexes at pH ...to U +4 ; both are insoluble under surface ...general, U loss occurs as U 6+ ...
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Provenance of late Paleozoic strata in the Yili Basin : implications for tectonic evolution of the South Tianshan orogenic belt
... imaging. U-Pb dat- ing and trace-element analyses of zircon were simultaneously conducted by laser ablation– inductively coupled plasma–mass spectrometry (LA-ICP-MS) at the State Key Laboratory of ...
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