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Littérature scientifique sur le sujet « U/Pb zircon age »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "U/Pb zircon age"

1

Huang, Yong-Shu, Qiu-Li Li, Yu Liu, Ping-Ping Liu, Sun-Lin Chung et 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.
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SHUMLYANSKYY, L. V., V. KAMENETSKY et B. V. BORODYNYA. « Age and Composition of Zircons From the Devonian Petrivske Kimberlite Pipe of the Azov Domain, the Ukrainian Shield ». Mineralogical Journal 43, no 4 (2021) : 50–55. http://dx.doi.org/10.15407/mineraljournal.43.04.050.

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Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zircon crystals separated from the Devonian Petrivske kimberlite are reported in the paper. Four zircons have yielded Paleoproterozoic and Archean ages, while one zircon grain gave a Devonian age of 383.6±4.4 Ma (weighted mean 206Pb/238U age). The Precambrian zircons have been derived from terrigenous rocks of the Mykolaivka Suite that is cut by kimberlite, or directly from the Precambrian rock complexes that constitute continental crust in the East Azov. The Devonian zircon crystal has the U-Pb age that corresponds to the age of kimberlite emplacement. It is 14 m.y. younger than zircon megacrysts found in the Novolaspa kimberlite pipe in the same area. In addition, Petrivske zircon is richer in trace elements than its counterparts from the Novolaspa pipe. Petrivske and Novolaspa zircons crystallized from two different proto-kimberlite melts, whereas the process of kimberlite formation was very complex and possibly included several episodes of formation of proto-kimberlite melts, separated by extended (over 10 M.y.) periods of time.
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Jackson, William T., Matthew P. McKay, Donald A. Beebe, Carolyn Mullins, Adelie Ionescu, Barry Shaulis et David L. Barbeau. « Late Cretaceous sediment provenance in the eastern Gulf Coastal Plain (U.S.A.) based on detrital-zircon U-Pb ages and Th/U values ». Journal of Sedimentary Research 91, no 10 (8 octobre 2021) : 1025–39. http://dx.doi.org/10.2110/jsr.2020.177.

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ABSTRACT Detrital-zircon U-Pb geochronology documents a regional- to continental-scale drainage reorganization along the eastern Gulf Coastal Plain (USA) from the Late Cretaceous (Cenomanian) to the Paleocene–Eocene. We present detrital-zircon U-Pb ages and Th/U values from the Maastrichtian Ripley Formation to determine the sedimentary provenance and to provide spatiotemporal resolution of drainage reorganization. The Ripley Formation contains a 12.7% overall average abundance of detrital zircons with low (< 0.1) Th/U values relative to the underlying Cenomanian Tuscaloosa Group (3.6%), the overlying Paleocene–Eocene Wilcox Group (2.8%), an Appalachian foreland composite (2.1%), and the laterally equivalent McNairy Sandstone in the northern Mississippi Embayment (3.8%). Multidimensional scaling of detrital-zircon U-Pb spectra shows that the Ripley Formation is dissimilar from underlying and overlying Gulf Coastal Plain units, the McNairy Sandstone, and an Appalachian foreland composite sample because of differences in proportions of Appalachian (490–270 Ma) and Grenville (1250–900 Ma) zircons. We interpret the southern Appalachian Piedmont province as the principal sediment source region for the Ripley Formation to account for the elevated abundance of grains with low (< 0.1) Th/U values and unique detrital-zircon U-Pb age spectra. Results suggest a regional-scale (105 km2) drainage network, which delivered sediment to the Maastrichtian coast followed by northwestward littoral transport and eventual mixing with Appalachian foreland-derived sediment in the northern Mississippi Embayment. This study further brackets drainage reorganization along the eastern Gulf Coastal Plain and demonstrates how simple chemical–age relationships, such as zircon Th/U values coupled with U-Pb ages, can be used to evaluate sediment provenance.
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Hervé, Francisco, Víctor Faúndez, Manfred Brix et Mark Fanning. « Jurassic sedimentation of the Miers Bluff Formation, Livingston Island, Antarctica : evidence from SHRIMP U–Pb ages of detrital and plutonic zircons ». Antarctic Science 18, no 2 (juin 2006) : 229–38. http://dx.doi.org/10.1017/s0954102006000277.

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Detrital zircon populations from two sandstone samples from the lower member (Johnsons Dock Member) of the Miers Bluff Formation at Hurd Peninsula have been dated by the Sensitive High Resolution Ion Microprobe (SHRIMP) U–Pb method. In one of the samples, zircons as young as early Middle Jurassic (Bajocian) age are present. In the second sample, the youngest detrital zircons are Middle Triassic in age. The detrital zircon age spectra indicate that Permian, early Palaeozoic and Meso- to Neoproterozoic zircon bearing rocks were present in the source areas of the Miers Bluff Formation. The sedimentary rocks are intruded by the Hespérides Point Intrusive diorite stock which yielded a U–Pb zircon crystallization age of 137.7 ± 1.4 Ma (Early Cretaceous, Valanginian). These results indicate that sedimentation of the Johnsons Dock Member of the Miers Bluff Formation is bracketed in time between the Bajocian and the Valanginian. The Miers Bluff Formation has been correlated with the Trinity Peninsula Group from the Antarctic Peninsula, based on sedimentological and structural similarity. Since the Trinity Peninsula Group is older than Middle Jurassic a direct chronological correlation is not supported by our new U–Pb zircon data. However, we suggest that the tectonic setting may have migrated in time with deposition of the pre-Middle Jurassic TPG on the peninsula, to Livingston Island where the maximum age for deposition of the MBF is Bajocian (about 170 Ma).
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Shi, Yu, Xi Jun Liu et Zuo Hai Feng. « Formation Age of the Qinling Complex and the early Paleozoic Tectonic Event ». Advanced Materials Research 734-737 (août 2013) : 60–70. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.60.

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The Qinling orogenic belt (QOB) located between the North China Craton (NCC) and the South China Craton (SCC) is composed of the Northern Qinling Belt (NQB) and the Southern Qinling Belt (SQB). This study presents new geochemical data, zircon U-Pb ages and Hf isotopes from two rocks from the Qinling complex in the NQB. LA-ICP-MS zircon U-Pb dating results suggest that the Qinling complex was formed in early Neoproterozoic and experienced the early Paleozoic metamorphism. HighεHf(t) values of 9.0-12.0 for the early Paleozoic zircons indicated that there is mantle-derived magma intruding into the Qinling complex in the early Paleozoic.
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Davies, Joshua H. F. L., Jörn-Frederik Wotzlaw, Alexander P. Wolfe et Larry M. Heaman. « Assessing the age of the Late Cretaceous Danek Bonebed with U–Pb geochronology ». Canadian Journal of Earth Sciences 51, no 11 (novembre 2014) : 982–86. http://dx.doi.org/10.1139/cjes-2014-0136.

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An ash-rich volcaniclastic sandstone immediately underlying dinosaur-rich material from the Danek Bonebed in the Horseshoe Canyon Formation (HCF), Edmonton, Alberta, Canada, contains accessory zircon, which have been dated employing U–Pb geochronology. Both laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and chemical abrasion isotope dilution thermal ionization mass spectrometry (ID-TIMS) U–Pb analyses have been conducted. The zircon age distributions are complex with U–Pb dates ranging from Precambrian to Cretaceous. We consider the youngest ID-TIMS 206Pb/238U date of 71.923 ± 0.068 Ma as the maximum deposition age of the ash-rich sandstone, placing the overlying Danek bonebed in the early Maastrichtian. This age is compatible with the paleontological assemblage from the Danek Bonebed and the regional stratigraphy. The zircon age distribution also implies that the HCF had a complex provenance of the detritus with some Archean and Proterozoic zircons, a group of Mesozoic, and a large compliment of Cretaceous grains. The results highlight the importance of high precision geochronology in constraining the age of important fossil deposits such as the Danek Bonebed.
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Waight, Tod, Mikael Stokholm, Benjamin Heredia et Tonny B. Thomsen. « U-Pb zircon and titanite age of the Christiansø granite, Ertholmene, Denmark, and correlation with other Bornholm granitoids ». Bulletin of the Geological Society of Denmark 70 (23 mars 2022) : 27–38. http://dx.doi.org/10.37570/bgsd-2022-70-03.

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A granitic sample from the Danish island of Christiansø in the Ertholmene island group north of Bornholm is described petrographically and geochemically, and dated using U-Pb in zircon and titanite. Zircon systematics in the sample are complicated by abundant Pb loss and a large population of zircons interpreted as being inherited. Removal of highly disturbed zircons, imprecise analyses, and assumed inherited zircons yield an upper intercept date of 1500 ± 18 Ma (MSWD = 13, n = 58). Removal of zircons with high common Pb from this population yields an identical result of 1500 ± 22 Ma (MSWD = 8, n = 34). Zircons that are ≤3% discordant give a weighted average 206Pb/238U age of 1458 ± 12 Ma (MSWD = 3.0, n = 18), and a weighted average 207Pb/206Pb age of 1495 ± 14 Ma (MSWD = 4.7, n = 19). Titanites from the sample yield a lower intercept age of 1448 ± 15 Ma (MSWD = 6.8, n = 45). The sample contains a significant number of inherited grains indicative of ages around 1.7–1.8 Ga. The relatively large MSWDs for these age determinations indicate geological complexity, likely reflecting Pb loss, and the possible presence of inherited zircons which suffered major Pb loss during incorporation in the granitic magma. The zircon and titanite dates agree reasonably well with previous age determinations on felsic lithologies from the Bornholm mainland, as well as from the Blekinge Province of southern Sweden. Petrographically and geochemically, the Christiansø granite is indistinguishable from, and can be correlated with, the A-type granites and gneisses which occur on Bornholm. The high abundance of disturbed and inherited zircons (c. 1.7–1.8 Ga) may indicate that the granite was intruded into and assimilated a nearby region of unexposed Transscandinavian Igneous Belt rocks. The somewhat altered nature of the rock, and overall disturbance of U-Pb zircon systematics, suggest alteration associated with fluid-flow along nearby faults defining the northern margin of the Sorgenfrei–Tornquist Zone.
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Vozárová, Anna, Miloš Šmelko et Ilya Paderin. « Permian single crystal U-Pb zircon age of the Rožňava Formation volcanites (Southern Gemeric Unit, Western Carpathians, Slovakia) ». Geologica Carpathica 60, no 6 (1 décembre 2009) : 439–48. http://dx.doi.org/10.2478/v10096-009-0032-1.

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Permian single crystal U-Pb zircon age of the Rožňava Formation volcanites (Southern Gemeric Unit, Western Carpathians, Slovakia)Zircon populations from the Rožňava Formation volcanic rock complex have been analysed. Euhedral zircons from the 1stvolcanogenic horizon with fine oscillatory growth zoning, typical of magmatic origin, gave the average concordia age of 273.3 ± 2.8 Ma, with Th/U ratios in the range of 0.44-0.73. The Permian ages ranging from 266 to 284 Ma were identified in the wider, zoned or unzoned, central zircon parts, as well as in their fine-zoned oscillatory rims. The average concordia age of 275.3 ± 2.9 was obtained from the euhedral zircon population of the 2ndvolcanogenic horizon of the Rožňava Formation. The analyses were performed on zoned magmatic zircons in the age interval from 267 to 287 Ma, with Th/U ratios in the range of 0.39-0.75. In the later zircon population two inherited zircon grains were dated giving the age of 842 ± 12 Ma (Neoproterozoic) and 456 ± 7 Ma (Late Ordovician). The magmatic zircon ages document the Kungurian age of Permian volcanic activity and contemporaneous establishment of the south-Gemeric basin. The time span of volcanic activity corresponds to the collapse of the Western Carpathian Variscan foreland which expanded southward.
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Røhr, Torkil S., Tom Andersen, Henning Dypvik et Ashton F. Embry. « Detrital zircon characteristics of the Lower Cretaceous Isachsen Formation, Sverdrup Basin : source constraints from age and Hf isotope data ». Canadian Journal of Earth Sciences 47, no 3 (mars 2010) : 255–71. http://dx.doi.org/10.1139/e10-006.

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Detrital zircons from the Lower Cretaceous Isachsen Formation of the Sverdrup Basin, Canadian Arctic Archipelago, have been dated by the U–Pb method and analyzed for Hf isotopes by laser ablation microprobe – inductively coupled plasma – mass spectrometry (LAM–ICP–MS). Five samples from four locations on Ellesmere and Axel Heiberg islands display similar ranges of U–Pb ages, with significant zircon populations at 2.8–2.6, 1.9–1.8, 1.7–1.6, and 1.2–1.0 Ga. Major hiatuses occur between 2.4 and 2.0 Ga and from 0.96 to 0.5 Ga. Low initial εHfvalues indicating recycled crust components are significant in Palaeoproterozoic (1.9–1.8 Ga) and Neoarchaean (2.8–2.6 Ga) zircon populations. Other U–Pb age populations in the studied samples are dominated by zircon with positive εHfvalues, indicating a significant contribution from mantle-derived protoliths. The εHfvalues seen within a given U–Pb age population are generally consistent, with only minor scatter among the different samples. U–Pb and Hf data closely resemble previously published data from Lower Cretaceous rocks in northern Greenland, suggesting they have the same origin. The data are also largely consistent with the East Greenland Caledonides and the Precambrian basement of Greenland and northern Canada as predominant sources of zircon for the studied sandstones. However, based on the level of similarity between data from the Wandel Sea Basin and Sverdrup Basin sediments and on previous Nd isotope work in the Sverdrup Basin, it is likely that the sediments represent redeposited lower and middle Palaeozoic sediments.
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Anfinson, Owen A., Andrew L. Leier, Rich Gaschnig, Ashton F. Embry et Keith Dewing. « U–Pb and Hf isotopic data from Franklinian Basin strata : insights into the nature of Crockerland and the timing of accretion, Canadian Arctic Islands ». Canadian Journal of Earth Sciences 49, no 11 (novembre 2012) : 1316–28. http://dx.doi.org/10.1139/e2012-067.

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New detrital zircon uranium–lead (U–Pb) ages and initial epsilon hafnium (εHf(i)) data from the Devonian clastic succession of the Canadian Arctic Islands refines the provenance of strata within the Franklinian Basin and provides constraints on the geologic evolution of the landmass responsible for the Ellesmerian Orogen. This study contributes more than 500 U–Pb ages and 32 εHf(i) values from the Blackley Formation and the Parry Islands Formation. The Middle Devonian Blackley Formation represents the onset of clastic sedimentation into the Franklinian Basin during the Devonian period. Detrital zircon from two samples yield U–Pb age populations of 380–470, 500–700, 900–2100, and 2550–3000 Ma. The population of 500–700 Ma U–Pb ages indicates a source exotic to the northern Laurentian margin and is attributed to a continental landmass located north of the present Canadian Arctic Islands (often referred to as Crockerland). This is some of the earliest evidence of 500–700 Ma detrital zircon deposition onto the northern Laurentian margin and indicates this northern landmass is at least partially accreted to Laurentia by early-Eifelian time. The Late Devonian Parry Islands Formation is the uppermost succession of Ellesmerian Orogen foreland basin sedimentation in the Franklinian Basin. Detrital zircon from four samples yield U–Pb age populations of 370–450, 470–750, 930–2100, and 2300–3200 Ma. The U–Pb ages suggest the Parry Islands Formation is derived from the northern source terrane (Crockerland) and indicate this landmass contains rocks similar to that of the east Greenland Caledonides, Pearya, and northeastern Baltica. Rim and core U–Pb double dates from the 500–700 Ma detrital zircon population and εHf(i) values from the 380–450, 520–550, and 650–710 Ma detrital zircon populations help constrain magma generation processes within Crockerland and suggest the zircons are derived from a juvenile lithosphere.
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Thèses sur le sujet "U/Pb zircon age"

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TADESSE, Tarekegn, Kazuhiro SUZUKI et Mitsuo HOSHINO. « Chemical Th-U-total Pb isochron age of zircon from the Mereb Granite in northern Ethiopia ». Dept. of Earth and Planetary Sciences, Nagoya University, 1997. http://hdl.handle.net/2237/2833.

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Sorota, Kristin Joy. « Age and Origin of the Merrimack Terrane, Southeastern New England : A Detrital Zircon U-Pb Geochronology Study ». Thesis, Boston College, 2013. http://hdl.handle.net/2345/3043.

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Thesis advisor: J C. Hepburn
Thesis advisor: Yvette D. Kuiper
Metasedimentary rocks of the Merrimack terrane (MT) originated as a thick cover sequence on Ganderia consisting of sandstones, calcareous sandstones, pelitic rocks and turbidites. In order to investigate the age, provenance and stratigraphic order of these rocks and correlations with adjoining terranes, detrital zircon suites from 7 formations across the MT along a NNE-trending transect from east-central Massachusetts to SE New Hampshire were analyzed by U-Pb LA-ICP-MS methods on 90-140 grains per sample. The youngest detrital zircons in the western units, the Worcester, Oakdale and Paxton Formations, are ca. 438 Ma while those in the Kittery, Eliot and Berwick Formations in the northeast are ca. 426 Ma. The Tower Hill Formation previously interpreted to form the easternmost unit of the MT in MA, has a distinctly different zircon distribution with its youngest zircon population in the Cambrian. All samples except for the Tower Hill Formation have detrital zircon age distributions with significant peaks in the mid-to late Ordovician, similar abundances of early Paleozoic and late Neoproterozoic zircons, significant input from ~1.0 to ~1.8 Ga sources and limited Archean grains. The similarities in zircon provenance suggest that all units across the terrane, except for the Tower Hill Formation, belong to a single sequence of rocks, with similar sources and with the units in the NE possibly being somewhat younger than those in east-central Massachusetts. The continuous zircon age distributions observed throughout the Mesoproterozoic and late Paleoproterozoic are consistent with an Amazonian source. All samples, except the Tower Hill Formation, show sedimentary input from both Ganderian and Laurentian sources and suggest that Laurentian input increases as the maximum depositional age decreases
Thesis (MS) — Boston College, 2013
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics
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Loan, MaryEllen Louise. « New Constraints on the Age of Deposition and Provenance of the Metasedimentary Rocks in the Nashoba Terrane, SE New England ». Thesis, Boston College, 2011. http://hdl.handle.net/2345/2422.

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Thesis advisor: J. Christopher Hepburn
The Nashoba terrane of SE New England is one of three peri-Gondwanan tectonic blocks caught between Laurentia and Gondwana during the closure of the Iapetus Ocean in the early to mid- Paleozoic. U-Pb analyses (LA-ICP-MS) were carried out on zircon suites from the meta-sedimentary rocks of the Nashoba terrane. The youngest detrital zircons in the meta-sedimentary rocks of the Nashoba terrane are Ordovician in age. There is no significant difference in age between meta-sedimentary units of the Nashoba terrane across the Assabet River Fault Zone, a major fault zone that bisects the NT in a SE and a NW par. Zircon in meta-sedimentary rocks in the Marlboro Fm., the oldest unit of the Nashoba terrane, is rare, which may reflect the basaltic nature of the source material, and is commonly metamict. The Marlboro Fm. contained the oldest detrital grain of all the analyzed samples, with a core of ~3.3 Ga and rim of ~2.6 Ga indicating that it was sourced from Archaen crustal material. Detrital zircons from the Nashoba terrane show a complete age record between the Paleoproterozoic and Paleozoic that strongly supports a provenance from the Oaxiqua margin of Amazonia. The detrital zircon suite of the Nashoba terrane is distinct from both Avalonia and the Merrimack belt; however, they resemble zircon suites from Ganderia. This study proposes that the Nashoba terrane of Massachusetts correlates with the passive trailing edge of Ganderia. Finally, metamorphic zircon analyses of the terrane show that the Nashoba terrane experienced a peak in hydrothermal fluid infiltration during the Neoacadian orogeny
Thesis (MS) — Boston College, 2011
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences
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Gärtner, Andreas. « Geologic evolution of the Adrar Souttouf Massif (Moroccan Sahara) and its significance for continental-scaled plate reconstructions since the Mid Neoproterozoic ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234103.

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Located in the south of the Moroccan Sahara, the Adrar Souttouf Massif is the northern continuation of the Mauritanides at the western margin of the West African Craton. The massif itself exhibits a complex polyphase geologic history and contains four geologically different, SSW-NNE trending main units named from west to east: Oued Togba, Sebkha Gezmayet, Dayet Lawda, Sebkha Matallah. They are thrusted over each other in thin-skinned nappes with local windows of the discordantly overlain Archaean Reguibat basement. The eastern margin of the massif is bordered by the Tiris and Tasiast-Tijirit areas of the Reguibat Shield as well as its (par-) autochthonous Palaeozoic cover sequence, termed Dhloat Ensour unit. More than 5.500 U-Th-Pb age determinations and over 1.000 Hf isotopic measurements on single zircon grains from igneous, metamorphic, and sedimentary rocks of all the massifs units and its vicinity have yet been obtained. Most of the zircons were studied with respect to their morphological features. This method improves the accuracy of provenance studies by detecting varying zircon morphologies in space and time. These data are accompanied by U-Th-Pb age determinations on apatite as well as rutile. Together, they allow proposing a model of the geologic evolution of this poorly mapped area for the last 635 Ma. A combination of the obtained data with extensive zircon age databases of the surrounding cratons and terranes facilitates continental-scaled palaeogeographic reconstructions. Regarding the geologic evolution of the Adrar Souttouf Massif, the assembly of the first units began prior to 635 Ma. Although containing all the major zircon age and Hf-isotope populations of the West African Craton as well as some Mesoproterozoic grains, the Sebkha Gezmayet unit lies to the west of the Dayet Lawda unit of oceanic island arc composition. Hence, the Sebkha Gezmayet unit must have been rifted away from the craton prior to the formation of the oceanic unit within the West African Neoproterozoic Ocean at about 635 Ma. Recently published Hf and zircon age data of this unit suggest that the island arc was derived from a juvenile mantle source. Subsequently, the accretion of precursors of the Oued Togba and Sebkha Gezmayet units as well as a partial obduction of the oceanic Dayet Lawda unit and the Neoproterozoic sediments of a foreland basin (Sebkha Matallah unit) onto the Reguibat Shield took place. Peak metamorphism in the obducted oceanic rocks was reached at about 605 Ma. Magmatism in the western units between 610 and 570 Ma suggests on-going tectonic activity. The Early and Middle Cambrian is characterised by the erosion of the Ediacaran orogen and deposition of thick sedimentary sequences at the Sebkha Matallah unit, which acted as foreland basin. These sediments show a mostly West African zircon record with only some Mesoproterozoic grains provided by the westernmost parts of the massif. Initial rifting of the Oued Togba and Sebkha Gezmayet units from the remaining areas presumably occurred during the Late Cambrian. Coeval granitoid intrusions occurred on both sides of the rift. The two rifted units were likely involved to the polyphased Appalachian orogenies, which is emphasised by Devonian magmatism. Thus, and with respect to the isotopic data, the Oued Togba unit is interpreted to be of Avalonia affinity, while the Sebkha Gezmayet unit can likely be linked to Meguma. The units which remained at the West African Craton underwent intense sediment recycling during the entire Ordovician to Devonian times. Final accretion of all units and formation of the current massif was achieved during the Variscan-Alleghanian orogeny. This was accompanied by magmatism in the Sebkha Gezmayet unit and intense metamorphism of the Reguibat basement, whose zircons often show lower discordia intercepts of Carboniferous or Permian age. The post-Variscan period is characterised by erosion of the orogen and subjacent alternating cycles of sedimentation and deflation. The Adrar Souttouf Massifs importance for palaeogeographic reconstructions is given by the striking differences in the zircon age and Hf-isotope record of its westernmost Oued Togba unit and the remaining area. The results obtained from the Oued Togba unit resemble the published data of the Avalonia type terranes including prominent Mesoproterozoic, Ediacaran-Early Cambrian, as well as Early Devonian age populations. Many Mesoproterozoic zircons, which are exotic for the West African Craton prior to 635 Ma, form a ca. 1.20 to 1.25 Ga age peak that is an excellent tracer for detrital provenance studies and source craton identification of the sedimentary rocks. This is also valid for some sedimentary samples that do not show ages younger than 700 Ma, but large quantities of Mesoproterozoic zircon. These rocks can be correlated to similar sediments in Mauritania and W-Avalonia and are thought to be of pre-pan-African", i.e. pre-Ediacaran or even pre-Cryogenian age. They may give direct insights to the source area in Early to Mid Neoproterozoic times. Accordingly, comparison with published data of Amazonia and Baltica, allows setting up new hypotheses for the pre-Ediacaran history of the Avalonian type terranes. Lacking of magmatism in Amazonia between ca. 1200 and ca. 1300 Ma favours Baltica as source craton for the Avalonian terranes and requires a new point of view for the Neoproterozoic palaeogeography.
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Pepper, Martin Bailey. « Magmatic History and Crustal Genesis of South America : Constraints from U-Pb Ages and Hf Isotopes of Detrital Zircons in Modern Rivers ». Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/347220.

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South America provides an outstanding laboratory for studies of magmatism and crustal evolution because it contains older Archean-Paleoproterozoic cratons that amalgamated during Mesoproterozoic and Neoproterozoic supercontinent assembly, as well as a long history of Andean magmatism that records crustal growth and reworking in an accretionary orogen. We have attempted to reconstruct the growth and evolution of South America through U-Pb geochronology and Hf isotope analyses of detrital zircons from 59 samples of sand from modern rivers and shorelines. Results from 5,524 new U-Pb ages and 1,199 new Hf isotope determinations are reported. We have also integrated our data into a compilation of all previously published zircon geochronologic and Hf isotopic information, yielding a record that includes>42,000 ages and>1,600 Hf isotope analyses. These data yield five main conclusions: (1) South America has an age distribution that is similar to most other continents, presumably reflecting the supercontinent cycle, with maxima at 2.2-1.8 Ga, 1.6-0.9 Ga, 700-400 Ma, and 360-200 Ma; (2)<200 Ma magmatism along the western margin of South America has age maxima at 183 Ma (191-175 Ma), 151 Ma (159-143 Ma), 126 Ma (131-121 Ma), 109 Ma (114-105 Ma), 87 Ma (95-79 Ma), 62 Ma (71-53 Ma), 39 Ma (43-35 Ma), 19 Ma (23-15 Ma), and 6 Ma (10-2 Ma); (3) for the past 200 Ma, there appears to be a positive correlation between magmatism and the velocity of convergence between central South America and Pacific oceanic plates; (4) Hf isotopes record reworking of older crustal materials during most time periods, with incorporation of juvenile crustal materials at ~1.6-1.0 Ga, 500-400 Ma and ~200-100 Ma; and (5) the Hf isotopic signature of<200 Ma magmatism is apparently controlled by the generation of juvenile magmas during extensional tectonism and reworking of juvenile versus evolved crustal materials during crustal thickening and arc migration.
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Luo, Yan. « U-Pb age and Hf isotopic study of detrital zircons from the Liaohe Group constraints on the evolution of the Jiao-Liao-Ji Belt, North China craton / ». Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36639242.

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Wilson, John Robert. « U/Pb Zircon Ages of Plutons from the Central Appalachians and GIS-Based Assessment of Plutons with Comments on Their Regional Tectonic Significance ». Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35248.

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The rocks of the Appalachian orogen are world-class examples of collisional and extensional tectonics, where multiple episodes of mountain building and rifting from the pre-Cambrian to the present are preserved in the geologic record. These orogenic events produced plutonic rocks, which can be used as probes of the thermal state of the source region. SIMS (secondary ion mass spectrometry) U/Pb ages of zircons were obtained for ten plutons (Leatherwood, Rich Acres, Melrose, Buckingham, Diana Mills, Columbia, Poore Creek, Green Springs, Lahore and Ellisville) within Virginia. These plutons are distinct chemically, isotopically, and show an age distribution where felsic rocks are approximately 440 Ma, and Mafic rocks are approximately 430 Ma. Initial strontium isotopic ratios and bulk geochemical analyses were also performed. These analyses show the bimodal nature of magmatism within this region. In order to facilitate management of geologic data, including radiometric ages, strontium isotope initial ratios and major element geochemistry, a GIS based approach has been developed. Geospatially references sample locations, and associated attribute data allow for analysis of the data, and an assessment of the accuracy of field locations of plutons at both regional and local scales. The GIS based assessment of plutons also allows for the incorporation of other multidisciplinary databases to enhance analysis of regional and local geologic processes. Extending such coverage to the central Appalachians (distribution of lithotectonic belts, plutons, and their ages and compositions) will enable a rapid assessment of tectonic models.
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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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Gruber, Leonardo. « Geocronologia U-Pb em Zircão Detrítico aplicada ao estudo de proveniência de metassedimentos do Complexo Metamórfico Porongos – Região de Santana da Boa Vista, RS ». reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/56342.

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Estudos de proveniência em zircões detríticos através do método U-Th-Pb (LA-ICP-MS) dos metassedimentos do Complexo Metamórfico Porongos determinaram a existência de duas áreas-fontes principais de onde derivaram idades paleoproterozóicas e mesoproterozóicas para os xistos Arroio Areião, Cerro Cambará e quartzo milonitos associados. Foram obtidas idades entre 967 ± 15 Ma e 2454 ±26 Ma para a seqüência Arroio Areião, entre 894 ± 30 Ma e 2783 ± 18 Ma para a seqüência Cerro Cambará, e idades entre 1621 ± 16 Ma e 3185 ± 117 Ma para os quartzo milonitos associados. A área fonte com idades paleoproterozóicas pode ser correlacionada ás rochas do Complexo Encantadas, que faz parte do embasamento das unidades supracrustrais. As áreas-fontes para os zircões mesoproterozóicos (entre 967 e 1621 Ma) não foram ainda reconhecidas no Cinturão Dom Feliciano. Estes zircões podem ser derivados de associações de rocha pertencentes aos cinturões mesoproterozóicos (orogêneses Elzeverian e Greenville), associados ao sistema geodinâmico que incluí os crátons Amazonas, Kalahari, Congo – São Francisco e Laurencia e cinturões associados. O ambiente geotectônico de formação da paleobacia Porongos é compatível com a margem passiva, onde se estabeleceu um arco magmático. Este trabalho demonstra que do ponto de vista isotópico e estratigráfico, não existem diferenças significativas de idades detríticas entre as seqüências metassedimentares que afloram nos flancos da Antiforme de Santana da Boa Vista.
Provenance studies based upon detritic zircon grain U-Th-Pb methodology (LA-ICP-MS) from metasediments of Porongos Metamorphic Complex have determined the existence of two principal source-areas with paleoproterozoic and mesoproterozoic ages to the schists of Arroio Areião, Cerro Cambará and associated quartz mylonites. Where obtained ages between 967 ± 15 Ma and 2454 ±26 Ma to the Arroio Areião sequence, between 894 ± 30 Ma and 2783 ± 18 Ma to Cerro Cambará sequence, and 1621 ± 16 Ma e 3185 ± 117 Ma to the associated quartz mylonites. The source-area with paleoproterozoic ages can be related to the Encantadas Complex rocks, which is basement of the supracrustal sequences. The source-areas to the mesoproterozoic zircons (between 967 and 1621 Ma) are not recognized in the Dom Feliciano Belt. These zircons can be related to mesoproterozoic petrotectonic associations (Greenville and Elzeverian orogens) associated to the geodynamic system that includes the Amazon, Kalahari, Congo – São Francisco and Laurentia cratons, and associated belts. The tectonic environment of Porongos paleobasin it’s compatible with a passive margin, after where established a magmatic arc environment. This work shows that from isotopic and stratigraphyc point of view there is no significantly differences between the metasedimentary sequences cropping out in both Santana da Boa Vista antiform flanks.
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Luo, Yan, et 羅彥. « U-Pb age and Hf isotopic study of detrital zircons from the Liaohe Group : constraints on the evolution of theJiao-Liao-Ji Belt, North China craton ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36639242.

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Livres sur le sujet "U/Pb zircon age"

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Robb, L. J. U-Pb ages on single detrital zircon grains from the Witwatersrand Basin : Constraints on the age of sedimentation and on the evolution of granites adjacent to the depository. Johannesburg : University of the Witwatersrand, 1989.

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Robb, L. J. U-Pb ages on single detrital zircon grains from the Witwatersrand Basin : Constraints on the age of sedimentation and on the evolution of granites adjacent to the depository. Johannesburg : University of the Witwatersrand, 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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E, Zartman Robert, dir. U-Pb ages of volcanogenic zircon from porcellanite beds in the Vaughn member of the mid-Cretaceous Blackleaf Formation, southwestern Montana. Washington : U.S. G.P.O., 1995.

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Kinney, Sean Thomas. Re-evaluating the timescale of rift and post-rift magmatism on the Eastern North American Margin via zircon U-Pb geochronology. [New York, N.Y.?] : [publisher not identified], 2021.

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B, Stoeser D., Geological Survey (U.S.) et Saudi Arabia. Deputy Ministry for Mineral Resources, dir. U/PB zircon geochronology of the southern part of the Nabitah mobile belt and Pan-African Continental collision in the Saudi Arabian Shield. [Reston, Va.?] : U.S. Geological Survey, 1985.

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U-Pb Formation-age zircon geochronology results for the Brian Head, Bull Rush Peak, Casto Canyon, Cottonwood Mountain, Hatch, and Haycock Mountain quadrangles, Utah. Utah Geological Survey, 2013. http://dx.doi.org/10.34191/ofr-621.

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U-Pb detrital zircon geochronology results for the Salt Lake City north quadrangle, Utah. Utah Geological Survey, 2016. http://dx.doi.org/10.34191/ofr-657.

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U-Pb Zircon Geochronology Results for the Granite Peak and Granite Peak SE Quadrangles, Utah. Utah Geological Survey, 2009. http://dx.doi.org/10.34191/ofr-546.

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U-Pb Zircon Geochronology Results for the Davis Knolls, Faust, Ophir, and Vernon Quadrangles, Utah. Utah Geological Survey, 2013. http://dx.doi.org/10.34191/ofr-608.

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Chapitres de livres sur le sujet "U/Pb zircon age"

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Mukasa, Samuel B., et George R. Tilton. « Zircon U-Pb ages of super-units in the Coastal Batholith, Peru ». Dans Magmatism at a Plate Edge, 203–7. Boston, MA : Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-5820-4_17.

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Wu, Meiling. « Zircon U–Pb Geochronology and Hf Isotopes of Major Lithologies from the Jiaodong Terrane ». Dans Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 49–78. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_4.

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Wu, Meiling. « Zircon U–Pb Geochronology and Hf Isotopes of Major Lithologies from the Yishui Terrane ». Dans Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 79–108. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_5.

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Ferreira, A., C. Lopes, M. Chichorro, M. F. Pereira et A. R. Sola. « Deciphering a Multipeak Event in a Noncomplex Set of Detrital Zircon U–Pb Ages ». Dans Springer Geology, 717–22. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_135.

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Bowring, Samuel A., et Mark D. Schmitz. « 11. High-Precision U-Pb Zircon Geochronology and the Stratigraphie Record ». Dans Zircon, sous la direction de John M. Hanchar et Paul W. O. Hoskin, 305–26. Berlin, Boston : De Gruyter, 2003. http://dx.doi.org/10.1515/9781501509322-014.

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Osipova, Tatyana A., Maria V. Zaitceva et Sergei Votyakov. « U–Pb Age and Analysis of the Lu–Hf Isotope System of Zircon from Granitoids of the Final Phases of the Nepluyevsky Pluton (The Southern Urals) ». Dans Springer Proceedings in Earth and Environmental Sciences, 153–60. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00925-0_24.

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Pereira, M. F., A. Castro, C. Fernández, M. Chichorro et J. Martí. « Regional Implications of New U–Pb Zircon Ages from Rhyolitic Ignimbritic Deposits and Andesitic Flows of Permian–Carboniferous Basins in the Southern Pyrenees ». Dans Springer Geology, 1247–50. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_239.

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Kempe, Ulf, Torsten Gruner, Lutz Nasdala et Dieter Wolf. « Relevance of Cathodoluminescence for the Interpretation of U-Pb Zircon Ages, with an Example of an Application to a Study of Zircons from the Saxonian Granulite Complex, Germany ». Dans Cathodoluminescence in Geosciences, 415–55. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04086-7_17.

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Parrish, Randall R., et Stephen R. Noble. « 7. Zircon U-Th-Pb Geochronology by Isotope Dilution — Thermal Ionization Mass Spectrometry (ID-TIMS) ». Dans Zircon, sous la direction de John M. Hanchar et Paul W. O. Hoskin, 183–214. Berlin, Boston : De Gruyter, 2003. http://dx.doi.org/10.1515/9781501509322-010.

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Su, Ben-Xun. « Zircon U–Pb Geochronlogy and Hf–O Isotopes ». Dans Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB : Petrogenesis, Mineralization and Tectonic Implication, 69–106. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_5.

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Actes de conférences sur le sujet "U/Pb zircon age"

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Sundell, Kurt E., et Joel E. Saylor. « UNMIXING DETRITAL ZIRCON U-PB AGE DISTRIBUTIONS ». Dans GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305507.

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Fekete, Jack. « CLASSIFYING DETRITAL ZIRCON U-PB AGE DISTRIBUTIONS USING MACHINE LEARNING ». Dans GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-382023.

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Kasbohm, Jennifer, Blair Schoene, Blair Schoene, Alessandro Montanari, Alessandro Montanari, Roldolfo Coccioni, Roldolfo Coccioni, Pincelli M. Hull et Pincelli M. Hull. « REVISING AGE MODELS FOR MIOCENE DEEP-SEA SEDIMENTS WITH U-PB ZIRCON GEOCHRONOLOGY ». Dans GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370628.

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Hodges, Montana, Cathy Busby, Holli Swarner, Russell Shapiro, Tahlor Newby, Charles Dailey et Christopher Hodges. « BURIED IN LAHAR : DETRITAL ZIRCON U-PB MIOCENE AGE CONSTRAINTS OF THE MOKELUMNE PALEOCHANNEL ». Dans GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-383150.

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Klein, Benjamin, et Michael Eddy. « WHAT’S IN AN AGE ? CALCULATION OF AGES AND DURATIONS FROM U-PB ZIRCON GEOCHRONOLOGY OF IGNEOUS ROCKS ». Dans GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-381370.

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Shan, Qiang, Jun Guan, Xueyuan Yu et Deru Xu. « SHRIMP Zircon U-Pb Age and Geological Significance of Caledonian Granites in Hainan Island (China) ». Dans Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2345.

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Hamilton, Michael A., Gerilyn S. Soreghan, Carlos P. Carvajal, Peter E. Isaacson, George W. Grader et Mercedes M. di Pasquo. « A PRECISE U-PB ZIRCON AGE FROM VOLCANIC ASH IN THE PENNSYLVANIAN COPACABANA FORMATION, BOLIVIA ». Dans 68th Annual Rocky Mountain GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016rm-276278.

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Schoene, Blair, Kyle Michael Samperton, Michael P. Eddy, Gerta Keller, Thierry Adatte et Syed F. R. Khadri. « TOWARD A HIGH-RESOLUTION AGE MODEL FOR THE DECCAN TRAPS BY U-PB ZIRCON GEOCHRONOLOGY ». Dans GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305419.

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Kinny, Peter D., Brendon J. Griffin et Felix F. Brakhfogel. « Shrimp U/Pb ages of perovskite and zircon from Yakutian kimberlites ». Dans International Kimberlite Conference. University of Alberta Library, 1995. http://dx.doi.org/10.29173/ikc1860.

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Bullard, Abigail R., Carol M. Dehler et Mark Schmitz. « GETTING YOUNGER WITH AGE : NEW ID-TIMS U-PB DETRITAL ZIRCON AGE CONSTRAINTS ON NEOPROTEROZOIC SEDIMENTARY SUCCESSIONS, SOUTHWESTERN U.S ». Dans GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287196.

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Rapports d'organisations sur le sujet "U/Pb zircon age"

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Tuzzolino, A. L., P. B. O'Sullivan, L. K. Freeman et R. J. Newberry. Zircon U-Pb age data, Ray Mountains area, Bettles Quadrangle, Alaska. Alaska Division of Geological & Geophysical Surveys, mai 2016. http://dx.doi.org/10.14509/29662.

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Solie, D. N., P. B. O'Sullivan, M. B. Werdon, L. K. Freeman, R. J. Newberry, D. J. Szumigala et T. D. Hubbard. Zircon U-Pb age data, Alaska Highway Corridor, Tanacross and Nabesna quadrangles, Alaska. Alaska Division of Geological & Geophysical Surveys, 2014. http://dx.doi.org/10.14509/27322.

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Lawley, C. J. M., D. Schneider, E. Yang, W. J. Davis, S E Jackson, Z. Yang, S. Zhang et D. Selby. Age relationships and preliminary U-Pb zircon geochronology results from the Lynn Lake Greenstone Belt. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2018. http://dx.doi.org/10.4095/306459.

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van Staal, C. R., J. P. Langton et R. W. Sullivan. A U-Pb zircon age for the ophiolitic Deveraux Formation, Elmtree Terrane, northeastern New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/126599.

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Mortensen, J. K., R. I. Thorpe, W. A. Padgham, J. E. King et W J Davis. U-Pb zircon ages for felsic volcanism in Slave Porvince, N.W.T. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/126606.

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Sullivan, R. W., R. P. Sage et K. D. Card. U-Pb zircon age of the jubilee stock in the michipicoten greenstone belt near Wawa, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120262.

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Roscoe, S. M., M. N. Henderson, P. A. Hunt et O. Van Breemen. U - Pb Zircon Age of An Alkaline Granite Body in the Booth River Intrusive Suite, N.w.t. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122753.

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Fallas, K. M., et 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.
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van Breemen, O., et A. Davidson. U-Pb zircon and baddeleyite ages from the Central Gneiss Belt, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129074.

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Frith, R. A., et O. van Breemen. U-Pb zircon age from the Himag plutonic suite, Thelon Tectonic Zone, Churchill Structural Province, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129069.

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