Journal articles: 'SHRIMP U-Pb dating'

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Nemchin, A. A., L. A. Neymark, and S. L. Simons. "U–Pb SHRIMP dating of uraniferous opals." Chemical Geology 227, no. 1-2 (March 2006): 113–32. http://dx.doi.org/10.1016/j.chemgeo.2005.09.005.

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Bonamici, Chloë E., and Tyler B. Blum. "Reconsidering initial Pb in titanite in the context of in situ dating." American Mineralogist 105, no. 11 (November 1, 2020): 1672–85. http://dx.doi.org/10.2138/am-2020-7274.

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Abstract In situ U-Pb dating of titanite, which can preserve trace-element records of various petrologic processes but also incorporates significant initial Pb, has proliferated in recent years. The widespread use of titanite data to construct tectonic P-T-t paths warrants careful assessment of the available dating techniques, as well as attention to the assumptions that underpin the U-Pb data analysis. This contribution provides the first direct comparison of the two major analytical methods [SHRIMP (SIMS) and LA-ICP-MS] for in situ U-Pb titanite dating. A set of well-characterized titanite grains from Harrisville, New York, in the Adirondack Mountains were analyzed for U-Th-Pb isotopes along the same cross-grain traverses by Sensitive High Resolution Ion Microprobe (SHRIMP) and LA-ICP-MS. Both LA-ICP-MS and SHRIMP data sets define approximately linear arrays on the Tera-Wasserburg Concordia (semi-total Pb/U) diagram and would commonly be interpreted as representing a single date population with minor scatter. However, previous studies have suggested that Adirondack titanite actually records two regionally well-defined thermal events, ~50–100 m.y. apart. When titanite data arrays are treated in detail, attempts to determine concordia-intercept ages by robust three-dimensional linear regression produce large uncertainties and/or poor fit statistics that suggest that the data are not, in fact, isochronous. Grain-by-grain analysis of U-Pb titanite data shows that different subsets of titanite (determined by additional geochemical and microstructural data) show different patterns of U-Pb data. By comparing predictions for Pb-ingrowth evolution paths in Tera-Wasserburg diagrams with observed data, it is possible to recognize both a change in initial Pb composition and Pb loss in the Adirondack titanite U-Pb data set. This study provides an example of how greater geochronologic detail can be extracted from large in situ U-Pb titanite data sets. Even when precise dates are not recovered, geological processes and events that cause data scatter can be recognized through analysis of U-Pb data patterns using the Tera-Wasserburg diagram.

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WAN, Yusheng. "Comparison of SHRIMP U-Pb dating of monazite and zircon." Chinese Science Bulletin 49, no. 14 (2004): 1501. http://dx.doi.org/10.1360/03wd0638.

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Akinin, V. V., L. B. Golovneva, and S. V. Shchepetov. "Isotopic age of flora-bearing beds from the Amka Formation stratotype, Okhotsk-Chukotka volcanic belt." Palaeobotany 7 (2016): 38–46. http://dx.doi.org/10.31111/palaeobotany/2016.7.38.

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U-Pb SHRIMP-dating of zircons from flora-bearing volcanic rocks of the Amka Formation stratotype (Ul'ya depression, Okhotsk-Chukotka volcanic belt) yield weighted mean 206Pb/238U age of 85.5 ±2 Ma (Santonian to Coniacian stage). This isotope dating is consistent with inferred Coniacian age of Ul’ya flora from the Amka Formation.

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Matukov, D. I., E. N. Lepekhina, E. A. Bagdasarov, A. V. Antonov, and S. A. Sergeev. "SHRIMP-II U–Pb dating of perovskite from ultramafic-alkaline intrusion." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A402. http://dx.doi.org/10.1016/j.gca.2006.06.810.

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Pelech, Ondrej, Anna Vozárová, Pavel Uher, Igor Petrík, Dušan Plašienka, Katarína Šarinová, and Nikolay Rodionov. "Late Permian volcanic dykes in the crystalline basement of the Považský Inovec Mts. (Western Carpathians): U–Th–Pb zircon SHRIMP and monazite chemical dating." Geologica Carpathica 68, no. 6 (August 1, 2017): 530–42. http://dx.doi.org/10.1515/geoca-2017-0035.

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AbstractThis paper presents geochronological data for the volcanic dykes located in the northern Považský Inovec Mts. The dykes are up to 5 m thick and tens to hundreds of metres long. They comprise variously inclined and oriented lenses, composed of strongly altered grey-green alkali basalts. Their age was variously interpreted and discussed in the past. Dykes were emplaced into the Tatricum metamorphic rocks, mostly consisting of mica schists and gneisses of the Variscan (early Carboniferous) age. Two different methods, zircon SHRIMP and monazite chemical dating, were applied to determine the age of these dykes. U-Pb SHRIMP dating of magmatic zircons yielded the concordia age of 260.2 ± 1.4 Ma. The Th-U-Pb monazite dating of the same dyke gave the CHIME age of 259 ± 3Ma. Both ages confirm the magmatic crystallization at the boundary of the latest Middle Permian to the Late Permian. Dyke emplacement was coeval with development of the Late Paleozoic sedimentary basin known in the northern Považský Inovec Mts. and could be correlated with other pre-Mesozoic Tethyan regions especially in the Southern Alps.

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Hwang, Sang Koo, In Hwa Jo, and Keewook Yi. "SHRIMP zircon U-Pb dating and stratigraphic relationship of the Bunam stock and Muposan tuff, Cheongsong." Journal of the Geological Society of Korea 52, no. 4 (August 31, 2016): 405–19. http://dx.doi.org/10.14770/jgsk.2016.52.4.405.

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Prytchin, M. E., E. I. Soroka, and V. N. Puchkov. "Novel U-Pb isotopic zircon data on the rhyolite of the Saf’yanovskoe Cu-Zn deposit (Middle Urals)." LITHOSPHERE (Russia) 21, no. 6 (December 29, 2021): 884–93. http://dx.doi.org/10.24930/1681-9004-2021-21-6-884-893.

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Research subject. Zircons from the Saf’yanovskoe Cu-Zn deposit rhyolite (Middle Urals). For the first time, zircon U-Pb dating for the rhyolite of the ore-bearing volcanic-sedimentary rocks of the Saf’yanovskoe deposit was performed. The volcanites are characterized by an andesite-rhyodacite composition and are localized at the southern edge of the Rezhevskaya structural-formation zone (SFZ) of the Eastern Ural megazone. A number of publications assign these rocks either to the basalt-rhyolite formation of the Middle Devonian, or to the basalt-andesite-dacite-rhyolite formation of the Lower-Middle Devonian.Aim. To estimate the age of the ore-bearing volcanic rocks under study using the U-Pb SHRIMP-II isotop ic system of zircon from the rhyolite of the eastern side of the Saf’yanovskoe deposit. By its chemical composition, the rhyolite belongs to the silicic varieties of subvolcanic rocks. Methods and results. The U-Pb isotopic system of zircon was studied by 5-collector mass-spectrometer of high precision and emission of the secondary ions SHRIMP-II (ASI, Australia) in the VSЕGEI Institute. U-Pb relations were investigated by a procedure developed by I.S. Williams. The U-Pb data obtained based on 13 zircon grains showed the age of 422.8 ± 3.7 Ma. Conclusions. The U-Pb dating of zircon obtained previously from the lens-shaped andesite bodies of the western side of the Safyanovskoe deposit gave the age of 422.8 Ma, which corresponds to the Przydoli series epoch of the Upper Silurian. We established that, among the volcanic rocks of the Saf’yanovskoe deposit, the effusive formations of the Upper Silurian are present.

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Rizvanova, Nailya G., Antonina A. Alenicheva, Sergey G. Skublov, Sergey A. Sergeev, and Dmitriy A. Lykhin. "Early Ordovician Age of Fluorite-Rare-Metal Deposits at the Voznesensky Ore District (Far East, Russia): Evidence from Zircon and Cassiterite U–Pb and Fluorite Sm–Nd Dating Results." Minerals 11, no. 11 (October 20, 2021): 1154. http://dx.doi.org/10.3390/min11111154.

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This article presents new isotope-geochronological results for the granites of the Voznesensky ore district (southeastern part of the Khanka massif). The granites are associated with extensive rare-metal–fluorite, tin and tantalum mineralization. Despite the numerous published results of Rb–Sr, Sm–Nd and U–Pb dating of ore-bearing granites and associated ores, the issues of age correlation and the genetic relationship of igneous rocks and mineralization remain unclear. U–Pb zircon SHRIMP dating reveals synchronous ages of 478 ± 4 Ma and 481 ± 7 Ma for two samples of biotite leucogranites as the age of magmatic crystallization of the Voznesensky granites. The composition of the studied zircon demonstrates the typical features of magmatic zircon and has the typical features of zircon exposed to fluids at the late/post-magmatic stage. Sm–Nd ID-TIMS dating of the fluorite of the Voznesenskoe deposit yields an age of 477 ± 9 Ma, and U–Pb ID-TIMS dating of cassiterite from the Yaroslavskoe and Chapaevskoe tin deposits yields an age of 480 ± 4 Ma, which confirms the direct genetic and age relationship of ore formation with granite magmatism.

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Hwang, Sang Koo, Weon-Seo Kee, and Keewook Yi. "SHRIMP U-Pb Zircon dating and stratigraphic implications of the Bojangsan Trachyte in the Imjingang belt, Korea." Journal of the Geological Society of Korea 53, no. 3 (June 30, 2017): 423–32. http://dx.doi.org/10.14770/jgsk.2017.53.3.423.

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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.

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LIU, Qisheng. "SHRIMP U-Pb zircon dating on Nyainqentanglha granite in central Lhasa block." Chinese Science Bulletin 49, no. 1 (2004): 76. http://dx.doi.org/10.1360/03wd0189.

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Tararin, I. A., Z. G. Badredinov, B. A. Markovsky, and B. I. Slyadnev. "U-Pb SHRIMP dating of zircons from metamorphic complexes in eastern Kamchatka." Russian Journal of Pacific Geology 6, no. 2 (April 2012): 114–30. http://dx.doi.org/10.1134/s1819714012020066.

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Liu, Qisheng, Zhenhan Wu, Daogong Hu, Peisheng Ye, Wan Jiang, Yanbin Wang, and Hancheng Zhang. "SHRIMP U-Pb zircon dating on Nyainqentanglha granite in central Lhasa block." Chinese Science Bulletin 49, no. 1 (January 2004): 76–82. http://dx.doi.org/10.1007/bf02901746.

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Krasnobaev, A. A., P. M. Valizer, E. V. Medvedeva, A. B. Nemov, and A. L. Perchuk. "U-Pb age and metamorphism of rocks of Voshnevogorsky sequence (South Ural)." Moscow University Bulletin. Series 4. Geology, no. 2 (April 28, 2020): 51–62. http://dx.doi.org/10.33623/0579-9406-2020-2-51-62.

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In the article present results of U-Pb — dating of zircons and petrologic-geochemical study of garnet-biotite plagiogneises and quartz-plagioclase-amphibole granofels host rocks samples from Vishnevogorsky sequence of the oldest rocks of the southern Urals Eastern domain are presented. U-Pb-dating of zircons were obtained by ion microprobe (SHRIMP II). The maximum age of the substrate plagiogneises Vishnevogorsky sequence not younger than 2700 Ma, and granulitic metamorphism plagiogneises falls on the Proterozoic age range 1740–2220 Ma. The dates obtained for plagiogneises and granofels Vishnevogorsky sequence reflect all major (PR1–P1) age stages of the Urals development. Many of the dated events are manifested only in the zircons generation and are not reflected in the mineral paragenesises of the studied rocks.

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Carson, C. J., S. D. Boger, C. M. Fanning, C. J. L. Wilson, and D. E. Thost. "SHRIMP U–Pb geochronology from Mount Kirkby, northern Prince Charles Mountains, East Antarctica." Antarctic Science 12, no. 4 (December 2000): 429–42. http://dx.doi.org/10.1017/s0954102000000523.

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Sensitive High Resolution Ion MicroProbe (SHRIMP) U–Pb zircon dating of pegmatites from Mount Kirkby, northern Prince Charles Mountains, east Antarctica indicates felsic intrusive activity at 991 ± 22 Ma and 910 ± 18 Ma. Pegmatite emplacement occurred during prolonged high-grade early Neoproterozoic tectonism. These ages correlate well with previously published U–Pb zircon ages obtained from felsic intrusive bodies elsewhere within the northern Prince Charles Mountains. Early Palaeozoic activity at Mount Kirkby is restricted to the emplacement of minor planar pegmatites at 517 ± 12 Ma, which provide a maximum age for local development of discrete extensional mylonites. No conclusive evidence of tectonic or metamorphic events at c. 800 Ma and c. 500 Ma, which have been recently postulated for the region, can be identified from the presently available U–Pb zircon data.

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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.

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Hwang, Sang Koo, So-Jin Lee, Kyo-Young Song, and Keewook Yi. "SHRIMP Zircon U-Pb dating and stratigraphical implication of the volcanic rocks around Yokjido Island, Tongyeong, Korea." Journal of the Geological Society of Korea 54, no. 3 (June 30, 2018): 269–80. http://dx.doi.org/10.14770/jgsk.2018.54.3.269.

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GAO, Linzhi, Xiaozhong DING, Chongyu YIN, Chuanheng ZHANG, and Frank R. ETTENSOHN. "Qingbaikouan and Crygenian in South China: Constraints by SHRIMP Zircon U-Pb dating." Acta Geologica Sinica - English Edition 87, no. 6 (December 2013): 1540–53. http://dx.doi.org/10.1111/1755-6724.12158.

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Li, Dongyu, Zhengxi Yang, Kanghui Thong, Xianxing Wu, and Xiaodong Chen. "Late Paleozoic Tectonic Analysis and Geochronology Study by Shrimp Zircon U-Pb Dating." Chemistry and Technology of Fuels and Oils 54, no. 6 (January 2019): 795–803. http://dx.doi.org/10.1007/s10553-019-00989-8.

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Wang, Ran, Bin Xia, Guoqing Zhou, Yuquan Zhang, Zhiqing Yang, Wenqian Li, Dongliang Wei, Lifeng Zhong, and Lifeng Xu. "SHRIMP zircon U-Pb dating for gabbro from the Tiding ophiolite in Tibet." Chinese Science Bulletin 51, no. 14 (July 2006): 1776–79. http://dx.doi.org/10.1007/s11434-006-2027-y.

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Chemale Jr, Farid, Koji Kawashita, Ivo A. Dussin, Janaína N. Ávila, Dayvisson Justino, and Anelise Bertotti. "U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration." Anais da Academia Brasileira de Ciências 84, no. 2 (May 15, 2012): 275–96. http://dx.doi.org/10.1590/s0001-37652012005000032.

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The LA-MC-ICP-MS method applied to U-Pb in situ dating is still rapidly evolving due to improvements in both lasers and ICP-MS. To test the validity and reproducibility of the method, 5 different zircon samples, including the standard Temora-2, ranging in age between 2.2 Ga and 246 Ma, were dated using both LA-MC-ICP-MS and SHRIMP. The selected zircons were dated by SHRIMP and, after gentle polishing, the laser spot was driven to the same site or on the same zircon phase with a 213 nm laser microprobe coupled to a multi-collector mixed system. The data were collected with a routine spot size of 25 μm and, in some cases, of 15 and 40 μm. A careful cross-calibration using a diluted U-Th-Pb solution to calculate the Faraday reading to counting rate conversion factors and the highly suitable GJ-1 standard zircon for external calibrations were of paramount importance for obtaining reliable results. All age results were concordant within the experimental errors. The assigned age errors using the LA-MC-ICP-MS technique were, in most cases, higher than those obtained by SHRIMP, but if we are not faced with a high resolution stratigraphy, the laser technique has certain advantages.

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Cocherie, Alain, Thierry Baudin, Albert Autran, Catherine Guerrot, C. Mark Fanning, and Bernard Laumonier. "U-Pb zircon (ID-TIMS and SHRIMP) evidence for the early ordovician intrusion of metagranites in the late Proterozoic Canaveilles Group of the Pyrenees and the Montagne Noire (France)." Bulletin de la Société Géologique de France 176, no. 3 (May 1, 2005): 269–82. http://dx.doi.org/10.2113/176.3.269.

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Abstract Depending on the quality of the zircon grains available for analysis, two methods may be used to date igneous rock emplacement, namely U-Pb TIMS with isotope dilution or in situ U-Pb SIMS (SHRIMP). Both methods have been used to determine, in a precise and accurate manner, the emplacement age of the granitic protolith of the various orthogneisses in the Pyrenean Axial Zone. More specifically, four representative samples of G1, G2 and a “transition gneiss” yielded reliable datings with an average age of 473 ± 4 Ma for each sample. The surrounding sediments of the Canaveilles Group were constrained by zircon grains from interlayered metarhyodacite and dated at 581 ± 10 Ma using the SHRIMP method, clearly giving this group a late Proterozoic (Vendian) age. Finally, the Somail orthogneiss of the Montagne Noire, equivalent to that of the Canigou, yielded an age of 471 ± 4 Ma with the in situ U-Pb method, which is identical to the dating of the Pyrenean samples. In addition, most of the studied orthogneisses recorded a wide range of significant concordant inherited ages spanning from early Archaean (3.5 Ga) to Pan-African/Cadomian (600–800 Ma). Bearing in mind the calc-alkaline affinity of the studied rocks, this work demonstrates the huge contrast between the active Gondwana margin in the north (“South European terrane”) and the remarkably homogeneous continental plate that existed from Arabia to Morocco during the Ordovician.

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Van Niekerk, H. S., R. Armstrong, and P. Vasconcelos. "The Grenvillian assembly of Rodinia: Timing of accretion on the western margin of the Kalahari (Kaapvaal) Craton." South African Journal of Geology 123, no. 4 (October 26, 2020): 441–64. http://dx.doi.org/10.25131/sajg.123.0042.

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Abstract During the Grenvillian assembly of Rodinia, the Namaqua-Natal Metamorphic Province (NNMP) was formed as a result of the convergence of the Laurentia and Kalahari cratons. A detailed model for this accretion along the south-eastern margin of the Kalahari Craton has been established, but the tectonic history of the NNMP along the western margin of the Kalahari Craton has remained highly controversial. U-Pb SHRIMP zircon age dating of gneiss in the Kakamas Domain of the NNMP, as well as U-Pb SHRIMP age dating of detrital zircons and 40Ar/39Ar dating of metamorphic muscovite from sediments overlying the gneiss, confirms the presence of at least two separate events during the Namaqua-Natal Orogeny at ~1 166 Ma and 1 116 Ma. These events occurred after the Areachap Terrane was accreted onto the western margin of the Proto-Kalahari Craton during the Kheis Orogeny. 40Ar/39Ar ages derived from metamorphic muscovite formed in the metasediments of the Kheis terrane does not provide evidence for the timing of the Kheis Orogeny but suggests that it most likely only occurred after ~1 300 Ma and not at 1 800 Ma as commonly accepted. A U-Pb concordia age of ~1 166 Ma was derived from granitic gneiss in the Kakamas Domain of the Bushmanland Subprovince, possibly reflecting subduction and the initiation of continent-continent collision between the Proto-Kalahari Craton and the Bushmanland Subprovince. This granitic gneiss is nonconformably overlain by the metasediments of the Korannaland Group that contains metamorphic muscovite with 40Ar/39Ar ages of ~1 116 Ma. This age suggest that complete closure of the ocean between the Proto-Kalahari Craton and Bushmanland Subprovince probably occurred about 50 Ma after the intrusion of the ~1 166 Ma granitic gneisses.

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Magee Jr., Charles W., Simon Bodorkos, Christopher J. Lewis, James L. Crowley, Corey J. Wall, and Richard M. Friedman. "Examination of the accuracy of SHRIMP U–Pb geochronology based on samples dated by both SHRIMP and CA-TIMS." Geochronology 5, no. 1 (January 11, 2023): 1–19. http://dx.doi.org/10.5194/gchron-5-1-2023.

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Abstract. Estimations of the reproducibility of U–Pb ages from SHRIMP (Sensitive High-Resolution Ion MicroProbe) instruments are based on data from studies that are nearly 2 decades old. Since that time, refinement of analytical procedures and operational improvements have reduced the historically identified uncertainties of SHRIMP U–Pb analysis. This paper investigates 36 SHRIMP thermal ionisation mass spectrometry (TIMS) double-dated “real-world” geologic samples from a variety of igneous rock types to better understand both geological and analytical sources of disagreement between the two dating methods. Geoscience Australia's (GA) use of high-precision chemical abrasion thermal ionisation mass spectrometry (CA-TIMS) for chronostratigraphy in Australian sedimentary basins has produced a substantial selection of precisely dated zircons, which we can use to cross-correlate the SHRIMP and CA-TIMS ages throughout the Phanerozoic. A total of 33 of the 36 ages were reported with external SHRIMP uncertainties less than 1 % (95 % confidence). Six of eight cases where the CA-TIMS age was outside the SHRIMP uncertainty envelope were in samples where the 95 % confidence interval of the reported SHRIMP age was below 0.66 % uncertainty, suggesting that SHRIMP analyses of untreated zircon with smaller uncertainties are probably overoptimistic. The mean age offset between SHRIMP and TIMS ages is 0.095 %, but the distribution appears bimodal. Geological explanations for age discrepancies between SHRIMP and CA-TIMS are suggested by considering intrusive and extrusive age results separately. All but one sample where the SHRIMP age is more than 0.25 % older are volcanic. This offset could be explained by the better single-grain age resolution of TIMS, allowing identification and exclusion of antecrysts from the eruptive population, while SHRIMP does not have a sufficient single-grain precision to deconvolve these populations – leading to an apparent older SHRIMP age. In contrast, SHRIMP ages from plutonic rocks – particularly plutonic rocks from the early Paleozoic – are typically younger than the CA-TIMS ages from the same samples, most likely reflecting Pb loss from non-chemically abraded SHRIMP zircons, while chemical abrasion of zircons prior to TIMS analysis destroyed or corrected these areas of Pb loss.

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Lee, So Jin, Sang Koo Hwang, Kyo-Young Song, and Keewook Yi. "SHRIMP U-Pb zircon dating and stratigraphy of the Cretaceous volcanic rocks in Namhae and Saryang islands, southernmost Korea." Journal of the Geological Society of Korea 55, no. 5 (October 31, 2019): 621–32. http://dx.doi.org/10.14770/jgsk.2019.55.5.621.

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Krasnobaev, A. A., P. M. Valizer, and A. L. Perchuk. "ORDOVICIAN AGE OF DUNITE-WEHRLITE-CLINOPYROXENITE BENDED COMPLEX OF NURALI MASSIF (SOUTHERN URALS, RUSSIA): SHRIMP U-PB ZIRCON DATING." Moscow University Bulletin. Series 4. Geology, no. 1 (February 28, 2018): 60–70. http://dx.doi.org/10.33623/0579-9406-2018-1-60-70.

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We present the data of geochemistry and geochronology of zircons from wehrlites and clinopyroxenites from dunite-wehrlite-clinopyroxenite bended complex of the base of crustal section of ophiolite Nurali massif. The U-Pb age of the bended complex is 450±4 Ma which is different from the previous data. Zircons from the studied rocks have complimentary REE patterns and similar U-Pb ages to lherzolites and dunites from mantle section of the Nurali massif.

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Jelinek, Andréa R., Artur C. Bastos-Neto, Jayme A. D. Leite, Léo A. Hartmann, and Neal J. McNaughton. "SHRIMP U-Pb zircon dating of Pedras Grandes Suite, southern Santa Catarina State, Brazil." Anais da Academia Brasileira de Ciências 77, no. 1 (March 2005): 125–35. http://dx.doi.org/10.1590/s0001-37652005000100010.

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Two major magmatic pulses of the granitic Florianópolis Batholith in Santa Catarina State, southern Brazil, occurred between 613±5Ma and 595±5 Ma, during the Neoproterozoic Brasiliano Cycle. These ages were obtained by U-Pb isotopic determinations with the sensitive high mass-resolution ion microprobe on igneous zircons from Pedras Grandes Suite in Santa Catarina State. Euhedral zircons remained unaltered close to a fluorite vein deposited at 180?C or more. These ages suggest a northern limit for the Pedras Grandes Suite, explaining the spatial relationship between the fluorite veins and the source rock.

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XU, Wenliang. "SHRIMP zircon U-Pb dating in Jingshan ?migmatitic granite?, Bengbu and its geological significance." Science in China Series D 48, no. 2 (2005): 185. http://dx.doi.org/10.1360/03yd0045.

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Rasmussen, Birger, Ian R. Fletcher, and Neal J. McNaughton. "Dating low-grade metamorphic events by SHRIMP U-Pb analysis of monazite in shales." Geology 29, no. 10 (2001): 963. http://dx.doi.org/10.1130/0091-7613(2001)029<0963:dlgmeb>2.0.co;2.

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31

ZHANG, Haixiang. "Zircon SHRIMP U-Pb dating on plagiogranite from Kuerti ophiolite in Altay, North Xinjiang." Chinese Science Bulletin 48, no. 20 (2003): 2231. http://dx.doi.org/10.1360/02wd0593.

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32

Zhang, Haixiang, Hecai Niu, Kentaro Terada, Xueyuan Yu, Hiroaki Sato, and Jun’ichi Ito. "Zircon SHRIMP U-Pb dating on plagiogranite from Kuerti ophiolite in Altay, North Xinjiang." Chinese Science Bulletin 48, no. 20 (October 2003): 2231–35. http://dx.doi.org/10.1007/bf03182858.

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33

Hu, JianMin, XinShe Liu, ZhenHong Li, Yue Zhao, ShuanHong Zhang, XiaoChun Liu, HongJie Qu, and Hong Chen. "SHRIMP U-Pb zircon dating of the Ordos Basin basement and its tectonic significance." Chinese Science Bulletin 58, no. 1 (July 16, 2012): 118–27. http://dx.doi.org/10.1007/s11434-012-5274-0.

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34

Fletcher, I. R., B. Rasmussen, and N. J. McNaughton. "SHRIMP U–Pb geochronology of authigenic xenotime and its potential for dating sedimentary basins." Australian Journal of Earth Sciences 47, no. 5 (October 2000): 845–59. http://dx.doi.org/10.1046/j.1440-0952.2000.00819.x.

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35

Rodionov, N. V., B. V. Belyatsky, A. V. Antonov, S. L. Presnyakov, and S. A. Sergeev. "Baddeleyite U-Pb SHRIMP II age determination as a tool for carbonatite massifs dating." Doklady Earth Sciences 428, no. 1 (October 2009): 1166–70. http://dx.doi.org/10.1134/s1028334x09070289.

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36

Khanchuk, A. I., V. G. Sakhno, and A. A. Alenicheva. "First SHRIMP U-Pb zircon dating of magmatic complexes in the southwestern Primor’e region." Doklady Earth Sciences 431, no. 2 (April 2010): 424–28. http://dx.doi.org/10.1134/s1028334x10040033.

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37

Izbrodin, I. A., G. S. Ripp, A. G. Doroshkevich, V. F. Posokhov, S. A. Sergeev, and V. M. Savatenkov. "U-Pb (SHRIMP-II) isotope dating of zircons from metamorphic rocks of Southwestern Transbaikalia." Doklady Earth Sciences 442, no. 2 (February 2012): 256–61. http://dx.doi.org/10.1134/s1028334x12020134.

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38

Wu, YuanBao, Jun Tang, ShaoBing Zhang, and ZiFu Zhao. "SHRIMP zircon U-Pb dating for two episodes of migmatization in the Dabie orogen." Chinese Science Bulletin 52, no. 13 (July 2007): 1836–42. http://dx.doi.org/10.1007/s11434-007-0249-2.

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Dusel-Bacon, Cynthia, and Ian S. Williams. "Evidence for prolonged mid-Paleozoic plutonism and ages of crustal sources in east-central Alaska from SHRIMP U–Pb dating of syn-magmatic, inherited, and detrital zircon." Canadian Journal of Earth Sciences 46, no. 1 (January 2009): 21–39. http://dx.doi.org/10.1139/e09-005.

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Sensitive high-resolution ion microprobe (SHRIMP) U–Pb analyses of igneous zircons from the Lake George assemblage in the eastern Yukon–Tanana Upland (Tanacross quadrangle) indicate both Late Devonian (∼370 Ma) and Early Mississippian (∼350 Ma) magmatic pulses. The zircons occur in four textural variants of granitic orthogneiss from a large area of muscovite–biotite augen gneiss. Granitic orthogneiss from the nearby Fiftymile batholith, which straddles the Alaska–Yukon border, yielded a similar range in zircon U–Pb ages, suggesting that both the Fiftymile batholith and the Tanacross orthogneiss body consist of multiple intrusions. We interpret the overall tectonic setting for the Late Devonian and Early Mississippian magmatism as an extending continental margin (broad back-arc region) inboard of a northeast-dipping (present coordinates) subduction zone. New SHRIMP U–Pb ages of inherited zircon cores in the Tanacross orthogneisses and of detrital zircons from quartzite from the Jarvis belt in the Alaska Range (Mount Hayes quadrangle) include major 2.0–1.7 Ga clusters and lesser 2.7–2.3 Ga clusters, with subordinate 3.2, 1.4, and 1.1 Ga clusters in some orthogneiss samples. For the most part, these inherited and core U–Pb ages match those of basement provinces of the western Canadian Shield and indicate widespread potential sources within western Laurentia for most grain populations; these ages also match the detrital zircon reference for the northern North American miogeocline and support a correlation between the two areas.

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Volkova, N. I., E. I. Mikheev, A. V. Travin, A. G. Vladimirov, A. S. Mekhonoshin, and V. V. Khlestov. "P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION." Geodynamics & Tectonophysics 12, no. 2 (June 23, 2021): 310–31. http://dx.doi.org/10.5800/gt-2021-12-2-0526.

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The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz). The pseudosection-based thermobarometry yields peak metamorphic temperature and pressure values (T=950 °C, P=~9 kbar) and suggests near-isobaric cooling (IBC) conditions during the retrograde evolution of the granulites. The U/Pb zircon age estimates for metamorphism (~1.87 Ga) support the data published by other researchers. The SHRIMP-II U-Pb dating of zircon cores yields a minimum protolith age of 1.94–1.91 Ga. Biotites and amphiboles from granulites of Cape Kaltygei show the 40Ar/39Ar isotopic ages that are close to the Early Paleozoic accretion-collision system of the Western Baikal region.

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Jia, Ru-Ya, Guo-Chang Wang, Lin Geng, Zhen-Shan Pang, Hong-Xiang Jia, Zhi-Hui Zhang, Hui Chen, and Zheng Liu. "Petrogenesis of the Early Cretaceous Tiantangshan A-Type Granite, Cathaysia Block, SE China: Implication for the Tin Mineralization." Minerals 9, no. 5 (April 29, 2019): 257. http://dx.doi.org/10.3390/min9050257.

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The newly discovered Tiantangshan tin polymetallic deposit is located in the southeast Nanling Range, Cathaysia block, Southeast China. The tin orebodies are mainly hosted in the greisen and the fractured alteration zones of the tufflava and trachydacite. However, the genetic relationship between the hidden alkali-feldspar granite and volcanic rocks and the tin mineralization remains poorly understood. This paper presents SHRIMP zircon U–Pb dating, whole-rock major and trace element analyses, as well as Nd isotopic data of the trachydacite and alkali-feldspar granite. The SHRIMP zircon U–Pb dating of the alkali-feldspar granite and trachydacite yields weight mean 206Pb/238U ages of 138.4 ± 1.2, and 136.2 ± 1.2 Ma, respectively. These granitic rocks have high levels of SiO2 (64.2–75.4 wt%, mostly > 68 wt%), alkalis (K2O + Na2O > 8.3 wt%), REE (except for Eu), HFSE (Zr + Nb + Ce + Y > 350 ppm) and Ga/Al ratios (10,000 × Ga/Al > 2.6), suggesting that they belong to the A-type granite. According to the high Y/Nb and Yb/Ta ratios, they can be further classified into A1 subtype. Their εNd (T) range from −3.8 to −6.5. They were likely generated by the assimilation-fractional crystallization (AFC) of the coeval oceanic island basalts -like basaltic magma. This study suggests that the A1 type granite is also a potential candidate for the exploration of tin deposits.

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42

Zhao, Ruixuan, Juhn G. Liou, Ru Y. Zhang, and Joseph L. Wooden. "SHRIMP U-Pb Dating of Zircon from the Xugou UHP Eclogite, Sulu Terrane, Eastern China." International Geology Review 47, no. 8 (August 2005): 805–14. http://dx.doi.org/10.2747/0020-6814.47.8.805.

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43

TSUTSUMI, Yukiyasu, Kazumi YOKOYAMA, Kenji HORIE, Kentaro TERADA, and Hiroshi HIDAKA. "SHRIMP U-Pb dating of detrital zircons in paragneiss from Oki-Dogo Island, western Japan." Journal of Mineralogical and Petrological Sciences 101, no. 6 (2006): 289–98. http://dx.doi.org/10.2465/jmps.060127.

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TSUTSUMI, Yukiyasu, Kazumi YOKOYAMA, Kentaro TERADA, and Yuji SANO. "SHRIMP U-Pb dating of detrital zircons in metamorphic rocks from northern Kyushu, western Japan." Journal of Mineralogical and Petrological Sciences 98, no. 5 (2003): 181–93. http://dx.doi.org/10.2465/jmps.98.181.

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45

WU, Cailai. "Zircon U-Pb SHRIMP dating of the Yematan batholith in Dulan, North Qaidam, NW China." Chinese Science Bulletin 49, no. 16 (2004): 1736. http://dx.doi.org/10.1360/03wd0347.

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46

Forbes, C. J., D. Giles, P. G. Betts, R. Weinberg, and P. D. Kinny. "Dating Prograde Amphibolite and Granulite Facies Metamorphism Using In Situ Monazite U‐Pb SHRIMP Analysis." Journal of Geology 115, no. 6 (November 2007): 691–705. http://dx.doi.org/10.1086/521611.

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47

Petrov, O. V., K. N. Malitch, S. S. Shevchenko, D. I. Matukov, S. L. Presnyakov, E. V. Tolmacheva, E. V. Tuganova, and V. O. Khalenev. "U–Pb SHRIMP dating of zircons from the ore-bearing Kharaelakh intrusion (Talnakh district, Russia)." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A486. http://dx.doi.org/10.1016/j.gca.2006.06.1435.

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48

Wu, Cailai, Jingsui Yang, Joseph L. Wooden, Rendeng Shi, Songyong Chen, Anders Meibom, and Chris Mattinson. "Zircon U-Pb SHRIMP dating of the Yematan batholith in Dulan, North Qaidam, NW China." Chinese Science Bulletin 49, no. 16 (August 2004): 1736–40. http://dx.doi.org/10.1007/bf03184308.

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Leite, J. A. D., L. A. Hartmann, L. A. D. Fernandes, N. J. McNaughton, Ê. Soliani, Jr., E. Koester, J. O. S. Santos, and M. A. Z. Vasconcellos. "Zircon U–Pb SHRIMP dating of gneissic basement of the Dom Feliciano Belt, southernmost Brazil." Journal of South American Earth Sciences 13, no. 8 (December 2000): 739–50. http://dx.doi.org/10.1016/s0895-9811(00)00058-4.

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Miao, LaiCheng, FuQin Zhang, DunYi Liu, YuRuo Shi, and HangQiang Xie. "Zircon SHRIMP U-Pb dating for gabbro at Chaotiehe in the Haicheng area, eastern Liaoning." Chinese Science Bulletin 55, no. 4-5 (September 17, 2009): 403–10. http://dx.doi.org/10.1007/s11434-009-0404-z.

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Journal articles on the topic 'SHRIMP U-Pb dating'

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