Relevant bibliographies by topics / U-Pb dating on zircons

Academic literature on the topic 'U-Pb dating on zircons'

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Published: 6 July 2024

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "U-Pb dating on zircons":

1

Huang, Yong-Shu, Qiu-Li Li, Yu Liu, Ping-Ping Liu, Sun-Lin Chung, and Xian-Hua Li. "238U–206Pb dating of U-series disequilibrium zircons by secondary ion mass spectrometry." Journal of Analytical Atomic Spectrometry 36, no. 5 (2021): 999–1006. http://dx.doi.org/10.1039/d0ja00510j.

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Theoretical and analytical methods for 238U–206Pb dating of U-series disequilibrium zircons by secondary ion mass spectrometry are developed. U–Pb dates improve age precision 3 times better than U–Th dating for zircon >150 ka.
2

Ito, Hisatoshi. "Simultaneous U–Pb and U–Th Dating Using LA-ICP-MS for Young (<0.4 Ma) Minerals: A Reappraisal of the Double Dating Approach." Minerals 14, no. 4 (April 22, 2024): 436. http://dx.doi.org/10.3390/min14040436.

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Simultaneous U–Pb and U–Th dating using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was performed on the ca. 0.1 Ma Toya tephra and the ca. 0.08 Ma SS14-28 U–Th zircon reference material. In U–Pb dating, both Th/U and Pa/U partitioning between magma and minerals were considered. In U–Th dating, both abundance sensitivity and molecular interferences on 230Th were reevaluated. As a result, the Toya tephra yielded an accurate weighted mean U–Pb age of 0.103 ± 0.029 Ma (2σ) using zircon and monazite. Conversely, the SS14-28 zircon yielded an inaccurate U–Pb age (0.25 ± 0.10 Ma), which was attributed to low 206Pb signal intensity. Both the Toya tephra zircon and the SS14-28 zircon yielded accurate U–Th model ages of 0.108 ± 0.014 Ma and 0.078 ± 0.007 Ma, respectively. The agreement of U–Pb and U–Th ages for Toya indicates that simultaneous U–Pb and U–Th dating is possible and viable. The inappropriate age of SS14-28 U–Pb age and appropriate U–Th model age also indicates it is preferable to apply both U–Pb and U–Th dating simultaneously for young (<0.4 Ma) zircons to check internal consistency. The proposed double dating approach may be especially useful for small grains when it otherwise would be impossible to obtain multiple ages from a single grain. By adopting simultaneous U–Pb and U–Th dating using LA-ICP-MS, zircon crystallization ages as old as 4.5 Ga to as young as 0.1 Ma (or even younger) can be obtained in a quick and cost-effective manner with a reasonable (~5% at 1σ) uncertainty.
3

Huijsmans, Jasper R., Maartje Hamers, Martyn R. Drury, and James K. W. Lee. "Recrystallisation and Trace-Element Mobility in Zircons: Implications for U-Pb Dating." Minerals 12, no. 12 (November 23, 2022): 1489. http://dx.doi.org/10.3390/min12121489.

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Complex microstructures of zircon recrystallisation have been discovered in igneous and metamorphic zircons from the Jack Hills Metasedimentary Belt in Western Australia, and the granitic injection complex of Harris in north-west Scotland. Cathodoluminescence (CL), electron backscatter diffraction (EBSD) and wavelength dispersive spectroscopy (WDS) analysis reveal that recrystallisation in the studied zircons is often characterised by (1) translation, bending and fading of the oscillatory zoning; (2) structural recovery of the zircon; (3) an enrichment in Hf and depletion in Y in recrystallised zircon; and (4) the formation of a recrystallisation interface with a minor (<2°) misorientation. A new, composite recrystallisation model in which trace element and dislocation migration occurs shortly after crystallisation during magmatic cooling and pipe diffusion along dislocation arrays formed by the accumulation of dislocations allows enhanced diffusion to enrich Hf and leach U, Pb and Y. After the recrystallisation event, subsequent metamictization of primary zircon (typically with oscillatory zoning) creates zones that can structurally recover through a diffusion-reaction re-equilibration mechanism, resulting in further trace-element mobility. These mechanisms can create complex microstructures in zircons, suggesting that a detailed understanding of the crystallisation and recrystallisation history of a zircon may be required to accurately interpret its U-Pb ages.
4

Schiøtte, L., W. Compston, and D. Bridgwater. "Ion probe U–Th–Pb zircon dating of polymetamorphic orthogneisses from northern Labrador, Canada." Canadian Journal of Earth Sciences 26, no. 8 (August 1, 1989): 1533–56. http://dx.doi.org/10.1139/e89-131.

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Rounded zircons included within igneous zircons from the Uivak I gneisses, northern Labrador, have ages of up to 3863 ± 12 Ma (2σ), showing the (former) existence of rocks that predate the Uivak gneisses by more than 100 Ma. The igneous zircons themselves have experienced varying amounts of early Pb loss, but age estimates based on maximum 207Pb/206Pb from three separate gneiss samples agree to within error at 3732 ± 6 Ma (2σ), which is taken as the age of emplacement of the igneous precursor to the dominant component of the Uivak gneisses. A new generation of zircons was formed during migmatization at ca. 3620 Ma. The volumetrically less important Lister gneiss was emplaced at 3235 ± 8 Ma (2σ). In the late Archaean, different parts of the gneiss complex were subjected to different grades of metamorphic overprinting. The zircon chronology of gneisses affected by granulite facies metamorphism suggests a rapid sequence of events, with simultaneous recrystallization of old zircons and growth of new U-poor zircons at 2766 ± 17 Ma (2σ), followed by partial melting at 2744 ± 4 Ma (2σ), and further recrystallization and growth of U-poor zircons afterwards. No late Archaean zircon growth has been recorded from orthogneisses unaffected by granulite fades metamorphism.
5

Kohút, Milan, Pavel Uher, Marián Putiš, Martin Ondrejka, Sergey Sergeev, Alexander Larionov, and Ilya Paderin. "SHRIMP U-Th-Pb zircon dating of the granitoid massifs in the Malé Karpaty Mountains (Western Carpathians): evidence of Meso-Hercynian successive S- to I-type granitic magmatism." Geologica Carpathica 60, no. 5 (October 1, 2009): 345–50. http://dx.doi.org/10.2478/v10096-009-0026-z.

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SHRIMP U-Th-Pb zircon dating of the granitoid massifs in the Malé Karpaty Mountains (Western Carpathians): evidence of Meso-Hercynian successive S- to I-type granitic magmatismRepresentative granitic rock samples from the Malé Karpaty Mountains of the Western Carpathians (Slovakia) were dated by the SHRIMP U-Th-Pb isotope method on zircons. Oscillatory zoned zircons revealed concordant Mississippian magmatic ages: 355±5 Ma in Bratislava granodiorite, and 347±4 Ma in Modra tonalite. The results document nearly synchronous, successive Meso-Hercynian plutonic events from S-type to I-type granites. The Neo-Proterozoic inherited zircon cores (590±13 Ma) were identified in the Bratislava S-type granitic rocks whereas scarce Paleo-Proterozoic inherited zircons (1984±36 Ma) were detected within the Modra I-type tonalites.
6

Doughty, P. Ted, and K. R. Chamberlain. "Protolith age and timing of Precambrian magmatic and metamorphic events in the Priest River complex, northern Rockies." Canadian Journal of Earth Sciences 45, no. 1 (January 1, 2008): 99–116. http://dx.doi.org/10.1139/e07-067.

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U–Pb dating of detrital zircons, magmatic zircons, and metamorphic zircon overgrowths and titanites from the Priest River complex, USA, reveal the ages of high-grade metasedimentary rocks, intrusive ages of associated igneous rocks, and the timing of Precambrian metamorphic events. Sensitive high-mass resolution ion microprobe (SHRIMP) U–Pb dates of detrital zircons from the Hauser Lake gneiss and Gold Cup Quartzite are predominately Paleoproterozoic with some Archean grains. The Hauser Lake gneiss contains detrital zircons with nearly concordant ages as young as 1511 Ma. Isotope dilution – thermal ionization mass spectrometry (ID–TIMS) and chemical abrasion – thermal ionization mass spectrometry (CA–TIMS) dating of magmatic zircon from amphibolites in the Hauser Lake Gneiss yield 1470–1430 Ma crystallization ages based on discordant data, with Cretaceous lower intercepts. The U–Pb zircon systematics are very complex and reflect multiple periods of magmatic and metamorphic growth. A combination of mechanical abrasion, chemical abrasion (CA–TIMS), and SHRIMP methods were required to identify the major geochronological components. These data, in addition to one Nd model age, strengthen correlations between the Hauser Lake Gneiss and the lower Belt–Purcell Supergroup and the Gold Cup Quartzite with the Neihart Quartzite, which underlies the Belt–Purcell Supergroup. Four SHRIMP-dated metamorphic zircon overgrowths give concordant Grenville dates with a weighted average of 1127 ± 110 Ma. This Grenville-aged metamorphic event is recorded by many isotopic systems in the Belt–Purcell basin and reflects a static thermal event, possibly driven by magmatism at depth.
7

Smirnova, Yu N., A. V. Kurilenko, V. B. Khubanov, and С. И. Дриль. "Composition and Age of Sources of the Lower–Middle Cambrian (?) Terrigenous Rocks from The Ernichny Formation in the Argun Massif, Eastern Part of the Central Asian Fold Belt." Стратиграфия 31, no. 5 (September 1, 2023): 98–115. http://dx.doi.org/10.31857/s0869592x23050071.

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The paper presents the results of the mineralogical and geochemical studies of sandstones and siltstones of the Ernichny formation of the Argun series in the Argun continental massif, and the results of U–Pb (LA‑ICP-MS) dating for the detrital zircons from these rocks. It is established that the youngest detrital zircons from sandstone of the Ernichny Formation have age of 549–570 Ma. A maximum on the relative probability curve of zircon age corresponds to 566 Ma. These data determine the lower age limit of their accumulation on the border of the Ediacaran and Paleozoic age. According to the results of U–Pb dating of detrital zircon, the majority of detrital zircons from sandstones of Ernichny Formation are characterized by Neo- and Paleoproterozoic ages. The sources of zircons were Neo- and Paleoproterozoic igneous and metamorphic rocks that were widely developed within the Argun continental massif. In turn, the geochemical features of the terrigenous rocks of the Ernichny Formation, together with the presence of the poorly sorted and rounded clastic material in the studied samples, as well as the presence of interlayers of gravelstones, enabled us to establish that they were formed in a subduction-related setting.
8

Greenough, John D., Tom E. Krogh, Sandra L. Kamo, J. Victor Owen, and Alan Ruffman. "Precise U-Pb dating of Meguma basement xenoliths: new evidence for Avalonian underthrusting." Canadian Journal of Earth Sciences 36, no. 1 (January 20, 1999): 15–22. http://dx.doi.org/10.1139/e98-079.

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U-Pb zircon and monazite dates for granulite-facies basement xenoliths from the Popes Harbour dyke on the eastern shore of Nova Scotia provide strong evidence that the Meguma terrane overlies Avalonian basement. Slightly discordant (1.6%), "facetted" zircons from a mafic granulite indicate a minimum crystallization age of ~629 Ma, with near-concordant (0.7%) rounded zircons suggesting a maximum age for the last metamorphic event affecting the zircons at ~575 Ma. Two near-concordant (-0.9 to 0.4%) monazite fractions from a pelitic granulite indicate a major metamorphic disturbance at 378 ± 1 Ma, ~10 Ma prior to dyke entrainment and coincident with Meguma regional metamorphism. Projections from 378 Ma through four highly discordant (15-42%) metapelite zircon fractions give provenance ages between 880 and 1050 Ma and two others project to maximum ages of ~1530 Ma. Unlike Meguma sediments which lack Grenvillian-age (~1 Ga) detrital zircons and are dominated by ~2000 Ma detrital zircons, these dates indicate a dominantly Grenvillian-age provenance for the pelitic xenoliths. The "Avalonian" igneous, metamorphic, and provenance ages from the xenoliths suggest the Meguma rests on Avalonian basement. Because Avalonian sediments need a Grenvillian provenance and Meguma sediments lack such a source but require a [Formula: see text]2.0 Ga component missing in the xenoliths, it seems unlikely the Meguma was deposited on Avalonian crust. Thus the dating places on firmer footing the suggestion from earlier structural, seismic, and geochemical work that the Meguma structurally overlies Avalonian terrane. Thrusting occurred between the time of earliest Meguma deformation (~400 Ma) and intrusion of the xenolith-bearing dyke (~370 Ma).
9

Zhang, Zhenkai, Tengfei Zhou, Dongtao Li, Hua Wang, Biao Du, Duanchang Zhao, Yafeng Zhang, et al. "Geochemistry, Detrital Zircon U-Pb Geochronology, and Lu-Hf Isotopes of the Metasedimentary Rocks (Xinghongpu Formation, Late Devonian) in the Central South Qinling Orogenic Belt: Implications for Provenance and Tectonics." Minerals 13, no. 6 (June 2, 2023): 768. http://dx.doi.org/10.3390/min13060768.

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The Xinghongpu Formation is very important for understanding the Devonian tectonic evolution of the South Qinling orogenic belt. Geochemical, detrital zircon U-Pb-Hf isotopic studies were carried out on the Late Devonian metasedimentary rocks of the Xinghongpu Formation to constrain the depositional age, the provenance, and the tectonic setting. The detrital zircon U-Pb dating results revealed that the depositional age of the Xinghongpu Formation of the Late Devonian was not earlier than 363.2 Ma. The whole-rock geochemistry suggested that (1) this suite of metasedimentary rocks was mainly derived from quartzose sediments of mature continental provenance, with a small contribution from mafic and intermediate igneous provenance, and (2) the metasedimentary sandstone of the Xinghongpu Formation from the Late Devonian was deposited in an active continental margin to continental arc setting. The detailed detrital zircon U-Pb dating showed that the age spectra of detrital zircon could be divided into four groups: (1) 416–480 Ma, accounting for about 23%; (2) 740–850 Ma, accounting for about 19%; (3) 889–1017 Ma, accounting for about 19%; and (4) 1072–1146 Ma, accounting for about 12%. It also contained a group of Early Proterozoic zircons. The age and Hf isotope of the detrital zircons suggested that the clastic sediment deposited in the Xinghongpu Formation mainly came from the South Qinling Orogenic Belt and the North Qinling Orogenic Belt. The detrital zircon Lu-Hf isotopes indicated that most zircons were the products of the ancient crustal remelting, and the mantle-derived magmatic sources contributed to the provenance. The Xinghongpu Fm. formed in an oceanic basin in a continental margin environment with arc systems.
10

Xie, Lie-Wen, Jin-Hui Yang, Qing-Zhu Yin, Yue-Heng Yang, Jing-Bo Liu, and Chao Huang. "High spatial resolution in situ U–Pb dating using laser ablation multiple ion counting inductively coupled plasma mass spectrometry (LA-MIC-ICP-MS)." Journal of Analytical Atomic Spectrometry 32, no. 5 (2017): 975–86. http://dx.doi.org/10.1039/c6ja00387g.

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A new LA-MIC-ICP-MS analytical technique has been developed for the rapid measurement of 206Pb/238U zircon age (<1%, 2s) at a high spatial resolution. We show that this technique can be routinely employed to date U–Pb in small and/or complex zircons, providing a powerful tool for geochronology.
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Journal articles Dissertations / Theses

Dissertations / Theses on the topic "U-Pb dating on zircons":

1

Hund, Erik A. "U-Pb dating of granites from the Charlotte belt of the southern Appalachians." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45758.

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New U-Pb zircon ages from plutons in the Charlotte belt of the southern Appalachians have provided evidence of Cambro-Ordovician and Siluro-Devonian magmatic activity. Several U-Pb zircon ages of Cambro-Ordovician plutons predate their Rb-Sr whole rock ages by as much as 60 m.y., suggesting a post emplacement disturbance of the Rb-Sr isotopic systems. Comparison of geologic setting, chemistry, and temporal and spatial distribution of Charlotte belt Siluro-Devonian plutons with those of other tectonic environments, specifically plutons from tensional environments, suggests a model for strike-slip accretion.
Master of Science
2

Sakata, Shuhei. "Development of analytical technique for precise age determination of Quaternary zircons with the correction of the initial disequilibrium on U-Th-Pb decay series using a laser ablation-ICP-mass spectrometry." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199112.

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Eastwood, Alan Andrew. "The Tahorakuri Formation: Investigating the early evolution of the Taupo Volcanic Zone in buried volcanic rocks at Ngatamariki and Rotokawa geothermal fields." Thesis, University of Canterbury. Geological Sciences, 2013. http://hdl.handle.net/10092/8925.

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The Tahorakuri Formation was introduced as a stratigraphic term to simplify the sometimes complex and inconsistent naming conventions in subsurface deposits within the geothermal fields of the central Taupo Volcanic Zone (TVZ). It consists of all volcaniclastic and sedimentary deposits between the ~350 ka Whakamaru-group ignimbrites and the greywacke basement that cannot be correlated with known ignimbrites. As such, it represents a long period in which relatively little is known about the volcano-tectonic history of the TVZ. The thesis focuses on the Tahorakuri Formation at Ngatamariki and Rotokawa geothermal fields and the implications for the volcano-tectonic evolution of the TVZ. Drill cuttings from wells NM5 and NM6 are re-examined, and new U-Pb zircon dates from the Tahorakuri Formation are presented and implications discussed. Potassium feldspars identified in the drill cuttings from NM5 were examined by Raman spectroscopy and electron microprobe (EMP) analysis. Although petrographically many of the feldspars appear similar to sanidine, a primary volcanic mineral phase, this showed them to be adularia which formed during hydrothermal alteration. Raman spectroscopy was found to be ideal for analysing a large number of grains quickly, with the spectral peak at ~140 cm⁻¹ being particularly useful for identifying adularia as it is absent in sanidine. EMP analysis was found to be somewhat slower, but definitively identified the feldspars as adularia, with typical potassium-rich compositions of Or₉₄-Or₉₉. U-Pb dating shows that the Tahorakuri Formation formed over a very long time, with pyroclastic deposits ranging from 1.89 - 0.70 Ma. This was followed by a period with little or no explosive volcanism until ~0.35 Ma during which sediments were deposited at Ngatamariki. The periods at ~1.9 Ma and ~0.9 Ma were particularly active phases of pyroclastic deposition, with the second phase likely correlating with the Akatarewa ignimbrite. The oldest deposits overlie a large andesitic composite cone volcano. Significant subsidence of the andesite must have preceded emplacement of the silicic deposits, indicating that rifting within the central TVZ may have started earlier than previously thought. While the origin of the deposits is uncertain, the distribution of the oldest deposits outcropping at the surface, as well as the likely early initiation of rifting, would suggest a source within the TVZ is likely.
4

Voice, Peter James. "The Global Detrital Zircon Database: Quantifying the Timing and Rate of Crustal Growth." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27785.

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Published detrital zircon geochronological data was compiled to form the Global Detrital Zircon Database (GDZDb). This database provides a reference block for provenance analysis by future detrital zircon geochronological studies. This project entailed three subprojects: 1. crustal growth/crustal recycling patterns, 2. a provenance study of the Triassic Dry Fork Formation of the Danville-Dan River Rift basin of Virginia and North Carolina, and 3. sample size issues in detrital zircon studies. The global detrital zircon age frequency distribution exhibits six prominent, statistically significant peaks: 3.2-3.0, 2.7-2.5, 2.0-1.7, 1.2-1.0, 0.7-0.5, and 0.3-0.1 Ga. These peaks are also observed when the data is sorted for continent of origin, the tectonic setting of the host sediment and for modern river sediments. Hf isotope model ages were also incorporated into the database where grains were dated with both U-Pb and Hf isotopes. The Hf isotope model ages suggest that the majority of detrital zircons U-Pb ages reflect crustal recycling events that generated granitic magmatism, as most grains exhibited Hf isotope ages that are much older than the corresponding U-Pb age. The Triassic Dry Fork Formation was sampled from a site in southern Virginia in the Danville-Dan River Basin. The detrital zircon age frequency distribution for this formation was strongly unimodal with a peak at 400-450 Ma and a paucity of Grenville-age zircons. Comparison of the Dry Fork sample to published east coast data and to the North American record (from the GDZDb) illustrate the unusual nature of the Dry Fork Formation sample. It is probable that older Grenville zircons were blocked from the rift valley by the rift shoulder. Using the GDZDb a study of sample size was conducted in order to estimate the best sample size to use when trying to constrain the maximum age of sedimentation of the host sediment. Rift basins and active margins exhibited smaller offsets from the youngest zircon grain age to host sediment maximum age than observed in samples from passive margins. This study recommends that at least 50 grains need to be age dated on average in order to best constrain the age of the host sediment.
Ph. D.
5

Sanchez, Lohff Sonia K. "Upper plate response to varying subduction styles in the forearc Cook Inlet basin, south-central Alaska." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1530270586819066.

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Dilles, Zoe Y. G. "Geochronologic and Petrologic Context for Deep Crustal Metamorphic Core Complex Development, East Humboldt Range, Nevada." Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/scripps_theses/811.

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The Ruby-Humboldt Range in Northeastern Nevada exposes the deepest crust in the western portion of the Sevier Hinterland. The product of unique brittle and ductile accommodations, this block of lower crustal rock is a window into the processes of continental thickening and extension. The structure of the northern tip of the Ruby-Humboldt Range core complex is dominated by a large recumbent fold nappe with a southward closeure cored by Paleoproterozoic-Archean gneissic complexes with complex interdigitated field relationships that record polyphase continental metamorphism. Amphibolite-grade metapelitic rocks within the core and Winchell Lake nappe record a wide range of zircon age dates of metamorphic events the oldest of which at ~2.5 Ga is recorded in adjacent orthogneiss as a crystallization age. At least two younger metamorphic events are recorded within this orthogneiss, most significantly at 1.7-1.8 Ga, an event previously unpublished for this region that links it to Wyoming province activity in addition to inherited component of detrital cores up to 3.7 Ga in age that is among the oldest ages reported in Nevada. The youngest overprint of cretaceous metamorphic overgrowth ranges fro 60-90 Ma in age based on zircon rims in the aforementioned units as well as three garnet amphibolites that intrude the core of the nappe and are interpreted to be metabasic bodies.
7

Marsden, Ruby Connemara. "Further Development and Testing of the Combined U-Thdisequilibrium/ U-Pb and (U-Th)/He Zircon Dating Method and its Application to Quaternary Volcanic Rocks." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/88743.

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Volcanic eruptions that are <1 Ma are significant for geological and archaeological investigations, however these eruptions can be challenging to date. Zircon double-dating (ZDD) is one of the few techniques that can be used to date young volcanic rocks, and combines the (U-Th)/He method with individual zircon crystallisation ages to yield eruption ages. This thesis presents several methodological improvements to the ZDD methodology and applies it to two case studies.
8

Godon, Cécile. "L'érosion dans les environnements glaciaires : exemple du Glacier des Bossons (Massif du Mont-Blanc, Haute-Savoie, France)." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00909603.

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Les travaux présentés dans ce mémoire ont pour but de mieux définir et quantifier lesprocessus d'érosion actuels en domaine glaciaire et proglaciaire. Le Glacier des Bossons,situé dans le massif du Mont-Blanc (Haute-Savoie, France), est un bon exemple de systèmenaturel non anthropisé permettant d'étudier cette thématique. Il repose sur deux lithologiesprincipales (le granite du Mont-Blanc et le socle métamorphique) et cette singularitépermettra de déterminer l'origine des sédiments glaciaires. Afin de comprendre lesmécanismes d'érosion mécanique et de transport particulaires en domaine glaciaire, lessédiments ont été prélevés à la surface du glacier, sous le glacier et dans les torrents sousglaciaires.L'étude des distributions granulométriques et des provenances des sédiments a étéeffectuée par une analyse lithologique à macro-échelle (à l'oeil nu) et géochimique à microéchelle(datation U-Pb sur zircons). Elles ont permis de préciser les caractéristiques del'érosion et du transport glaciaire. (1) la charge supra-glaciaire issue de l'érosion des versantsrocheux est essentiellement composée de sédiments grossiers et ne se mélange pas ou peu à lacharge sous-glaciaire, excepté au niveau de la langue terminale ; (2) les vitesses d'érosionsous-glaciaire ne sont pas homogènes, l'érosion sous la glace tempérée (0,4-0,8mm.an-1) estau moins seize fois supérieure à celle sous la glace froide (0,025-0,05mm.an-1) ; (3) lessédiments sous-glaciaires contiennent une fraction silteuse et sableuse résultant des processusd'abrasion et de crushing qui est évacuée par les torrents sous-glaciaires. L'acquisition hauterésolutiontemporelle de données hydro-sédimentaires durant la saison de fonte entre le 5 Maiet le 17 Septembre 2010 a permis de définir le comportement saisonnier des fluxhydrologiques et sédimentaires. La majeure partie des flux détritiques est concentrée sur lasaison de fonte, et une quantification de la quantité de sédiments exportés par le torrent desBossons complétée par une mesure régulière de l'évolution de la topographie du systèmefluvio-glaciaire permet d'effectuer un bilan global de l'érosion des domaines glaciaires etproglaciaires. Au cours de l'année 2010, près de 3000 tonnes de sédiments ont été érodés dont430 tonnes se sont déposeés sur le plan des eaux. Grâce à une analyse de l'évolution desconcentrations de matières en suspension en entrée et en sortie de la plaine alluviale fluvioglaciairedu torrent des Bossons, les composantes glaciaires et non-glaciaires de l'érosion ontpu être découplées. L'érosion des moraines dénudées encadrant le plan des eaux au cours desévénements orageux est responsable au minimum de 59% du flux de sédiments transporté parle torrent des Bossons, l'érosion glaciaire (41% du flux) est donc relativement moins efficace.L'évolution à long terme des systèmes glaciaires en période de réchauffement climatiquemontrerait donc une érosion soutenue des environnements proglaciaires (versants et moraines)récemment libéré des glaces et de ce fait une intensification des flux détritiques. Le glacierdes Bossons protège le sommet du Mont-Blanc, l'érosion différentielle entre les zones sous laglace et non-glaciaires pourrait mener à un accroissement de la différence d'altitude entre lesvallées et les sommets.
9

Bootes, Nathaniel R. "Late Cenozoic Offshore Record of Exhumation and Sediment Routing in Southeast Alaska from Detrital Zircon U/Pb and FT double-dating." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592169111121451.

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Zacca, Patricia Luciana Aver. "40Ar-39Ar em overgrowths de feldspatos potássicos e U-Pb em zircão – aplicação conjunta para o entendimento da Formação Marizal - Bacia do Recôncavo." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/72084.

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Unidades litológicas, em particular arenitos, muitas vezes, carecem de um posicionamento cronoestratigráfico preciso. Como os arenitos são importantes rochas-reservatório de hidrocarbonetos e aquíferos, a falta de exatidão nestas informações dificulta a exploração destes bens minerais. A datação relativa de rochas sedimentares pode ser obtida por análise do conteúdo fossilífero ou por correlação estratigráfica. Entretanto, em algumas rochas sedimentares, esta análise não é possível ou tem um caráter duvidoso. Este é o caso da Formação Marizal (Bacia do Recôncavo) que apresenta um histórico controverso sobre a real idade deposicional. A Formação Marizal é um arenito flúvio-eólico cuja idade é discutível e, por isso, sua posição na coluna estratigráfica (aproximadamente Albiniano/Aptiniano), ainda é questionável. Em algumas amostras são encontrados overgrowths de K-feldspatos e nos quais é possível aplicar a técnica de datação 40Ar-39Ar visando obter idades que possam ser relacionadas com processos ocorrentes nestes arenitos (em geral, deposição e/ou diagênese). Entre os minerais pesados existentes nas amostras da Formação Marizal, foram encontrados grãos de zircões. A datação U-Pb de zircões detríticos pode fornecer informações sobre a proveniência desta unidade. Assim, zircões da Formação Marizal foram analisados visando complementar as informações sobre esta unidade, permitindo uma melhor interpretação. Os overgrowths de K-feldspatos indicaram valor de 159.89 ± 23.96 Ma e, para o núcleo detrítico, 432.57 ± 11.89 Ma. O valor médio obtido em torno de 160 Ma, considerando-se que todos os cuidados analíticos e de seleção de amostra foram considerados, é mais antigo do que o esperado. Assim, este valor foi interpretado como indicativo de que o overgrowth teria sido desenvolvido numa rocha fonte sedimentar sendo posteriormente transportado. Esta idade pode ser relacionada a fase pré rifte da Bacia do Recôncavo. O valor confirma ideias existentes de remobilização do substrato da bacia durante a fase rifte. Como tem sido discutido, overgrowths de K-feldspato são estáveis e possíveis de serem transportados por pequenas distâncias, o que corrobora a interpretação acima. Já o valor obtido para o núcleo mostra a contribuição do Paleoprotrozóico adjacente à bacia, retrabalhado no Brasiliano. Em relação ao zircão, a idade do núcleo detrítico de 432,53± 6,54 Ma pode ser associada com a cobertura sedimentar do Paleoproterozóico retrabalhada no ciclo Brasiliano, também observada nos valores U-Pb definidos para os zircões. Em relação ao zircão, os dados indicam ausência aparente de fontes arqueanas. Os resultados mostram duas fontes principais para a sedimentação: uma Rhyaciana (Paleoproterozóico onde ± 53 % dos grãos são “Transamazônicos”) e outra Neoproterozóica-Cambriana (30% dos zircões são “Brasilianos”).
Sandstones represent the most important reservoir rocks and aquifers in many sedimentary basins. It is necessary to have a precise chronostratigraphic position in order to provide a better explotation of water or hydrocarbons. Traditionally, the relative dating of sedimentary units is obtained with fossil content or stratigraphic correlation. But in many sedimentary rocks these analyses are not possible and sometimes have a dubious interpretation. This is the case of the Marizal Formation (Recôncavo Basin) where many questions arise when the age of the unit is questioned. The Marizal Formation is a fluvio-eolic sandstone which has been associated with an Albian/Aptian age in the stratigraphic column, although very discussible. Samples of sandstones of Marizal Formation present an important diagenetic overgrowths around K-feldspar detrital cores and they are suitable to 40Ar-39Ar dating concerning the identification of processes in the sandstones (as diagenesis or depositional ages). Among the heavy mineral suite in the Marizal Formation, zircon grains are identified. The U-Pb dating of detrital zircons can provide information about the provenance of the unit allowing better interpretation to the Marizal Formation. The overgrowths of K-feldspar indicated a value of 159.89 ± 23.96 Ma and to the detrital core, 432.57 ± 11.89 Ma. The mean value obtained around 160 Ma, considering that all care and analytical sample selection were considered, is older than expected. So, this was interpreted as indicating that the overgrowth, have been developed in a sedimentary source rock being transported latter to the depositional site. This age may be related to pre-rift stage of the Recôncavo Basin. The value confirms previous ideas of remobilization of the substrate during the rift basin stage. As has been extensively discussed, overgrowths of K-feldspars are stable and can be transported by small distances, which corroborates the above interpretation. The value obtained to the detrital core can be associated with a Paleoproterozoic sedimentary cover reworked in the Brazilian cycle. For zircon U-Pb dating, the data indicate no apparent Archean sources. The results show two main sources for sedimentation: a Rhyacian (Paleoproterozoic where ± 53% of the grains are "Transamazonian") and another Neoproterozoic-Cambrian (30% of zircon are "Brazilian").
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Books on the topic "U-Pb dating on zircons":

1

Guerrot, C. Archéen et protérozoïque dans la chaîne hercynienne ouest-européenne: Géochimie isotopique (Sr-Nd-Pb) et géochronologie U-Pb sur zircons. Rennes, France: Editions du C.A.E.S.S., Université de Rennes I, 1989.

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Toth, Margo I. Constraints on the formation of the Bitterroot lobe of the Idaho Batholith, Idaho and Montana, from U-Pb zircon geochronology and feldspar Pb isotopic data. Washington, DC: U.S. G.P.O., 1992.

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I, Lazarev I͡U. Mineralʹnye U-Pb vozrasty dokembrii͡a vostochnoĭ chasti Baltiĭskogo shchita. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1987.

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Holliger, Philippe. The new OKLO reaction zones: U-Pb dating and in situ characterization of fission products by ion analysis : report on Progress 1991. Grenoble: Centre d'Études Nucléaires de Grenoble, 1993.

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Winkler, Wilfried, and Albrecht von Quadt, eds. Detrital Mineral U/Pb Age Dating and Geochemistry of Magmatic Products in Basin Sequences. MDPI, 2022. http://dx.doi.org/10.3390/books978-3-0365-4953-8.

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Ellam, Rob. 9. Uranium, thorium, and their daughters. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0009.

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All isotopes heavier than 208Pb (lead) are radioactive and many of these have half-lives that are long compared to the age of our Solar System. ‘Uranium, thorium, and their daughters’ describes the natural decay series where radioactive isotopes of uranium and thorium decay by α- and β-emission through several stages until a stable lead isotope is produced. The age of the Solar System and Earth has been established at 4.55 Ga through the isochron approach; U-Pb dating was also used to date the boundary between the Cretaceous and Palaeogene geological periods to 66 Ma, the period associated with a mass extinction on Earth when 70 per cent of living things died out.

Book chapters on the topic "U-Pb dating on zircons":

1

Chelle-Michou, Cyril, and Urs Schaltegger. "U–Pb Dating of Mineral Deposits: From Age Constraints to Ore-Forming Processes." In Isotopes in Economic Geology, Metallogenesis and Exploration, 37–87. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_3.

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AbstractThe timing and duration of ore-forming processes are amongst the key parameters required in the study of mineral systems. After more than a century of technical developments, innovations and investigation, the U–Pb system arguably is the most mature radioisotopic system in our possession to conduct absolute dating of a wide range of minerals across geological environments and metallogenic processes. Here, we review the basics of U–Pb geochronology, the key historic developments of the method, and the most commonly used analytical techniques (including data reduction, Pb-correction, uncertainty propagation and data presentation) and minerals while pointing out their respective advantages, weaknesses and potential pitfalls. We also highlight critical aspects that need to be considered when interpreting a date into the age of a geological process (including field and petrographic constraints, open-system behavior, handling and interpretation of uncertainties). While U–Pb geochronology is strongly biased toward zircon dating, we strive to highlight the great diversity of minerals amenable to U–Pb dating (more than 16 mineral species) in the context of mineral systems, and the variety of geological events they can potentially date (magmatism, hydrothermal activity, ore-formation, cooling, etc.). Finally, through two case studies we show (1) how multi-mineral geochronological studies have been used to bracket and decipher the age of multiple geological events associated with the world-class Witwatersrand gold province, and (2) how rather than the absolute age, the duration and rate of the mineralizing event at porphyry copper deposits opens new avenues to understand ore-forming processes and the main controls on the size of such deposits. The improving precision, accuracy and spatial resolution of analyses in tandem with high-quality field and petrographic observations, numerical modelling and geochemical data, will continue to challenge paradigms of ore-forming processes and contribute significant breakthroughs in ore deposit research and potentially to the development of new exploration tools.
2

Rubatto, Daniela, and Dieter Gebauer. "Use of Cathodoluminescence for U-Pb Zircon Dating by Ion Microprobe: Some Examples from the Western Alps." In Cathodoluminescence in Geosciences, 373–400. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04086-7_15.

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Jinzhong, Qi, Li Li, Yuan Shisong, and Liu Zhijie. "U-Pb SHRIMP dating of zircon from quartz veins at the Yangshan gold deposit: Evidence for multiple magmatic-hydrothermal events." In Mineral Deposit Research: Meeting the Global Challenge, 809–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_206.

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Amelin, Yuri. "Meteorites (U–Pb)." In Encyclopedia of Scientific Dating Methods, 1–6. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_111-1.

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Poller, Ulrike. "A Combination of Single Zircon Dating by TIMS and Cathodoluminescence Investigations on the Same Grain: The CLC Method — U-Pb Geochronology for Metamorphic Rocks." In Cathodoluminescence in Geosciences, 401–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04086-7_16.

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Suzuki, Kazuhiro, and Daniel J. Dunkley. "Uranium–Lead, Chemical Isochron U–Pb Method (CHIME)." In Encyclopedia of Scientific Dating Methods, 863–69. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_200.

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Suzuki, Kazuhiro, and Daniel J. Dunkley. "Uranium-Lead, Chemical Isochron U-Pb Method (CHIME)." In Encyclopedia of Scientific Dating Methods, 1–9. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_200-1.

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Harrison, T. Mark, Elizabeth J. Catlos, and Jean-Marc Montel. "14. U-Th-Pb Dating of Phosphate Minerals." In Phosphates, edited by Matthew J. Kohn, John Rakovan, and John M. Hughes, 523–58. Berlin, Boston: De Gruyter, 2002. http://dx.doi.org/10.1515/9781501509636-017.

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Ibinoof, Montasir A., Adam J. Bumby, Jean-Paul Liégeois, Geoff H. Grantham, Richard Armstrong, and Petrus Le Roux. "The Boundary Between the Saharan Metacraton and the Arabian Nubian Shield: Insight from Ediacaran Shoshonitic Granites of the Nuba Mountains (Sudan): U–Pb SHRIMP Zircon Dating, Geochemistry and Sr–Nd Isotope Constraints." In The Geology of the Arabian-Nubian Shield, 39–62. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72995-0_2.

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Armstrong, Richard, Sergei Vishnevsky, and Christian Koeberl. "U-Pb Analyses of Zircons from the Popigai Impact Structure, Russia: First Results." In Impacts in Precambrian Shields, 109–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-05010-1_5.

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Conference papers on the topic "U-Pb dating on zircons":

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Krautz, Jana, Mandy Hofmann, Ulf Linnemann, and Arno Kleber. "U-PB-DATING OF DETRITAL ZIRCONS APPLIED TO QUATERNARY SLOPE DEPOSITS: REGIONAL DIFFERENCES IN THE SOUTHWESTERN USA." In 72nd Annual GSA Rocky Mountain Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020rm-345903.

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Salimgaraeva, L. I., A. V. Berezin, and S. A. Sergeev. "ZIRCONS FROM THE ECLOGITE-HOSTED ROCKS OF MARUN-KEU COMPLEX, POLAR URALS: TRACE ELEMENTS, U-Pb DATING." In Annual Meeting of the Russian Mineralogical Society combined with the Fedorov Session 2023. LEMA, 2023. http://dx.doi.org/10.30695/zrmo/2023.032.

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Bracciali, Laura. "Coupled Zircon-Rutile U-Pb Chronology: LA ICP-MS Dating and Geological Significance." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.245.

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Burgess, Seth, Jorge Vazquez, Christopher F. Waythomas, and Kristi Wallace. "DATING THE QUATERNARY OLD CROW TEPHRA VIA ZIRCON U-TH-PB-HE GEOCHRONOMETERS." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-366889.

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McGehee, James, Cameron Davidson, and John I. Garver. "U-PB DETRITAL ZIRCON DATING OF THE SITKA GREYWACKE, BARANOF ISLAND, SE ALASKA." In Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-375730.

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Howland, Colby R., Jeffrey M. Amato, and Chelsea F. Ottenfeld. "THE PALEOPROTEROZOIC MAZATZAL PROVINCE OF SOUTHERN NEW MEXICO: INSIGHT FROM HF ISOTOPE GEOCHEMISTRY OF ZIRCONS, U-PB ZIRCON DATING, AND ND WHOLE-ROCK GEOCHEMISTRY." In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314287.

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Weinmann, Benjamin R., Chong Ma, Joshua J. Schwartz, and Mark G. Steltenpohl. "U-PB ZIRCON DATING OF THE ELKAHATCHEE QUARTZ DIORITE, EASTERN BLUE RIDGE OF ALABAMA." In 68th Annual GSA Southeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019se-327504.

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Korneva, Alexandra, Ekaterina Agasheva, and Alexey Semiryakov. "First results of U-Pb dating zircon of Tugan Zr-Ti placer deposit (West Siberia)." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6931.

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Walters, Alexis, Cameron Davidson, Richard Jongens, and Rose Turnbull. "U-PB ZIRCON DATING OF MAGMATISM AND METAMORPHISM IN THE CHARLESTON METAMORPHIC GROUP, NEW ZEALAND." In Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-375629.

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Carlson, Cameron L., Elizabeth J. Cassel, Andrew Canada, and Daniel F. Stockli. "CONSTRAINING SEDIMENT SOURCES ACROSS THE CORDILLERAN HINTERLAND IN THE EOCENE FROM DETRITAL ZIRCON U/PB DATING." In 68th Annual Rocky Mountain GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016rm-276271.

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Reports on the topic "U-Pb dating on zircons":

1

Roddick, J. C., and O. van Breemen. U-Pb zircon dating: a comparison of ion microprobe and single grain conventional analyses. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/195164.

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Fallas, K. M., and W. Matthews. Age dating of a bentonite in the Duo Lake Formation, western Mackenzie Mountains, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328830.

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In the Misty Creek Embayment of the western Mackenzie Mountains, Duo Lake Formation locally includes minor volcanic deposits associated with Marmot Formation volcanism. A bentonite layer from an outcrop of graptolitic shale found in NTS map area 106-B, in the upper part of the Duo Lake Formation, was sampled for U-Pb zircon dating. Analytical results yielded a dominant population of grains with a concordia age of 439.8 ± 3.0 Ma, interpreted as the age of deposition. Minor inherited zircon populations yielded ages ranging from approximately 1200 to 2850 Ma. Observed graptolites from the same outcrop likely range from Middle Ordovician to Early Silurian and are compatible with the interpreted U-Pb age of the bentonite. Previously known Middle and Late Ordovician volcanic activity in the Misty Creek Embayment is here expanded to include Early Silurian activity, and serves as a proxy for the timing of active extensional tectonism in the basin.
3

Bailes, A. H., P. A. Hunt, and T. M. Gordon. U - Pb Zircon Dating of Possible Synvolcanic Plutons in the Flin Flon Belt At Snow Lake, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/131935.

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Stavrev, Milen, Irena Peytcheva, Atanas Hikov, Rossitsa D. Vassileva, Albrecht von Quadt, Marcel Guillong, Valentin Grozdev, and Yulia Plotkina. Late Cretaceous Magmatism in Part of the Western Rhodopes (Bulgaria): U-Pb Dating on Zircon and Grossular-Andradite Garnets. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, April 2020. http://dx.doi.org/10.7546/crabs.2020.04.11.

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Peytcheva, Irena, Albrecht von Quadt, Lubomira Macheva, Krastina Kolcheva, and Stoyan Sarov. Relics of Devonian Oceanic Lithosphere in Byala Reka Dome, Eastern Rhodopes: Evidence from Zircon U‑Pb Dating and Hf‑isotope Tracing. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, December 2018. http://dx.doi.org/10.7546/crabs.2018.12.10.

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6

Bickerton, L., D. J. Kontak, I. M. Samson, J. B. Murphy, and D A Kellett. SHRIMP U-Pb zircon dating of the South Mountain Batholith, Nova Scotia: timing and duration of crystallization and evidence for inheritance. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/313664.

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Dudas, F. O., J. B. Henderson, and J. K. Mortensen. U-Pb ages of zircons from the Anton Complex, southern Slave Province, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129067.

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8

Sullivan, R. W., and C. R. van Staal. Age of a metarhyolite from the Tetagouche Group, Bathurst, New Brunswick, from U-Pb isochron analyses of zircons enriched in common Pb. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129077.

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Matthews, W., and W. J. Davis. A practical image analysis technique for estimating the weight of abraded mineral fractions used in U-Pb dating. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/210357.

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Sullivan, R. W., and A. D. Leclair. Age Constraints On the Puskuta Lake Shear Zone From U - Pb Dating of Granitoid Rocks, Kapuskasing Uplift, northern Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/134168.

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