Zircon U-Pb Age
Anticlockwise P T evolution at ∼280 Ma recorded from ultrahigh temperature metapelitic granulite in the Chinese Altai orogenic belt, a possible link with the Tarim mantle plume?
... 2 The SHRIMP zircon U-Pb age dating yielded a concordant age of 278 ± 2 Ma, and supported that the UHT metamorphic event in the Chinese Altai occurred in the Permian... 3 The UHT metamor[r] ...
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Karakoram fault activity defined by temporal constraints on the Ayi Shan detachment, SW Tibet
... New zircon U–Pb ages demonstrate that Ordovician migmatite (489, 478, and 435 Ma) from the footwall of the Ayi Shan detachment was later deformed within the KKF ductile shear ...on zircon ...
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Tracking exhumation and drainage divide migration of the western Alps: a test of the apatite U Pb thermochronometer
... Our zircon U-Pb data from the Molasse Rouge (BA03) yielded Alpine ages from two grains; the unit also has minor clinopyroxene thought to be reworked (Evans and Mange-Rajetzky, ...Our zircon ...
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Age assignment of the upper Carboniferous Arbasay Formation in Shichang Region, North Tianshan (NW China)
... MS zircon U – Pb dating was conducted to define the formation age of the Arbasay Formation in the Shichang Region of North Tianshan, which is exposed near the suture zone but its age ...
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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
... ID-TIMS age of 312 Ma as a benchmark suggests that the observed scatter may be partly attributed to analytical and methodological problems, in particular failing to distinguish subtly discordant spots from truly ...
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Fingerprinting Proterozoic bedrock in interior Wilkes Land, East Antarctica
... ~1000 zircon grains in the size range of 20–140 μ ...sediments. U–Pb zircon ages from the three samples reveal similar age peaks and have a statistically similar detrital distribution ...
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Chemical Abrasion Applied to LA ICP MS U Pb Zircon Geochronology
... facility. U–Pb data show a concordant cluster at ...common Pb, Pb-loss and possibly some degree of ...the U–Pb data, this scatter impedes a robust weighted mean age ...an ...
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Neoproterozoic to early Paleozoic extensional and compressional history of East Laurentian margin sequences : the Moine Supergroup, Scottish Caledonides
... (2004), U-Pb zircon age of 962 ± 32 Ma for the average of four analyses from youngest detrital grain in sample of Loch Eil Group, and U-Pb zircon age of 883 ± 35 Ma ...
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Zircon U-Pb geochronology of the Great Valley Group : recalibrating the lower cretaceous time scale
... Rhagodiscus nebulosus – both species which first appear in the upper Berriasian (Bralower et al., 1990) – within a meter above the sample. There are two notable species that are absent in GC670 as well: Rucinolithus ...
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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
... polyphase zircon means that some tectonothermal events may be ...Neoproterozoic age peak recorded by zircon cores were not observed in the rim over- growth ...mid-Cambrian age peak was re- ...
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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
... and U–Pb isotopic systems as thermochronometers it is becoming possible to discriminate the intrusion age from the later hydrothermal alteration ...
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Thermochronology of mineral grains in the Red and Mekong Rivers, Vietnam: provenance and exhumation implications for Southeast Asia
... The U-Pb ages measured from zircon grains constrain the timing of cooling below 750°C, corresponding to igneous ...drainage. Zircon fission and Ar-Ar mica age analyses are just below ...
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The origin of the Palaeoproterozoic AMCG complexes in the Ukrainian Shield : new U Pb ages and Hf isotopes in zircon
... published age results from a xenolith of older anorthosite enclosed in anorthosite of the main phase (sample KN-1/2, Shestopalova et ...single zircon crystals separated from the same ...the age of ...
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Age Constraints and Geochemistry of the Ordovician Tyrone Igneous Complex, Northern Ireland
... * Zircon grain characteristics specified as: x°N = non-magnetic, at specified tilt angle on a Frantz LB-1 Separator at ...spike Pb. # Corrected for fractionation, spike, laboratory blank Pb and ...
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Extensional faulting on Tinos Island, Aegean Sea, Greece: how many detachments?
... The U-Pb zircon age is relatively old and if a curve was drawn through the actual age points of the data (not consid- ering any errors) the cooling path (path 1 in Figure 9) would take ...
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Early Proterozoic U Pb Zircon Ages from Basement Gneiss at the Solovetsky Archipelago, White Sea, Russia
... accessory zircon which was required for comparative age determination in different laboratories using SIMS (Secondary Ion Mass-Spectro- metry) by Sensitive High-Resolution Ion Micro Probe (SHRIMP-II, at the ...
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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 Pb in the slightly alterated outer rims of the zircons as to be seen in Figure ...the zircon grains is quite simple consisting of a detrital rounded core and well developed zoned ...inherited age ...
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U Pb zircon ages for Yarlung Tsangpo suture zone ophiolites, southwestern Tibet and their tectonic implications
... The mantle peridotites at Luobusa are essentially residues from melting at a MOR, subsequently modi fi ed by SSZ magmatism (Bai et al., 1993; Zhou et al., 1996, 2005). The dated gabbros (c. 150 Ma.) dis- play a SSZ ...
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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
... different zircon grains have been analyzed. The concentrations of Th and U are 39-1836 ppm and 65-1473 ppm, respectively, yielding elevated Th/U ratios ...207 Pb/ 206 Pb mean age ...
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Benjamin_Thyer_Undergraduate_Thesis.docx
... New zircon U-Pb ages for samples MPRM-21 and MPRM-DSC ...the age range (Figure 3) reported for those two samples by Mills and Coleman (2013) and Hallman ...and age. Otherwise, the ...
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