Deciphering igneous and metamorphic events in high-grade rocks of the Wilmington Complex, Delaware: Morphology, cathodoluminescence and backscattered electron zoning, and SHRIMP U-Pb geochronology of zircon and monazite

Aleinikoff, John N.; Schenck, W.S.; Plank, M.O.; Srogi, LeeAnn; Fanning, Christopher; Kamo, Sandra L.; Bosbyshell, Howell

doi:10.1130/b25659.1

Cited by 381 publications

(167 citation statements)

References 46 publications

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“…207 Pb/ 206 Pb = 0.05532; 207 Pb/ 235 U = 0.06811; 206 Pb/ 238 U = 0.5195; and 208 Pb/ 232 Th = 0.02124 (Aleinikoff et al, 2006). None of the monazite-(Ce) grains required a common Pb correction due to the low concentration of common Pb.…”

Section: Monazite-(ce) U-pb Datingmentioning

confidence: 96%

Multiple stages of hydrothermal REE remobilization recorded in fluorapatite in the Paleoproterozoic Yinachang Fe–Cu–(REE) deposit, Southwest China

Zhou

2015

Geochimica et Cosmochimica Acta

113

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Section: Monazite-(ce) U-pb Datingmentioning

confidence: 96%

Multiple stages of hydrothermal REE remobilization recorded in fluorapatite in the Paleoproterozoic Yinachang Fe–Cu–(REE) deposit, Southwest China

Zhou

2015

Geochimica et Cosmochimica Acta

113

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“…Instrumental fractionation of U/Pb and 206 Pb/ 207 Pb during zircon analysis was calibrated by analyzing zircon fragments from a Sri Lanka zircon standard with an age of 564 ± 4 Ma at 2r . Instrumental fractionation was calibrated during monazite analysis by using monazite crystals from the Wissahickon Formation in Delaware (sample 44069, 206 Pb/ 238 U age of 426 ± 3 Ma at 2r; Aleinikoff et al, 2006). As the age of the monazite standard was based on measurement of 206 Pb/ 238 U, we accordingly use 206 Pb/ 238 U rather than 208 Pb/ 232 Th for monazite age determinations.…”

Section: Geochronologymentioning

confidence: 99%

Gangdese retroarc thrust belt and foreland basin deposits in the Damxung area, southern Tibet

Pullen

Kapp

Gehrels

et al. 2008

Journal of Asian Earth Sciences

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“…The final pit depths were ~ 6 µm.All data were processed using Iolite version 2.3 (Paton et al, 2011), which corrects for down-hole fractionation and machine drift using a matrix-matched primary reference material (RM) interleaved with the unknowns. The primary RM was 44069 monazite(Aleinikoff et al, 2006) for U-Pb ratios, and Bananeira monazite(Kylander-Clark et al, 2013; Palin et al, 2013) for trace elements. Bananeira monazite was used as a secondary RM for U-Pb ratios to assess accuracy of the unknown analyses, and additional uncertainty was added, in quadrature, to each analysis to account for variation in secondary-RM isotopic ratios within runs.…”

mentioning

confidence: 99%

Monazite trace-element and isotopic signatures of (ultra)high-pressure metamorphism: Examples from the Western Gneiss Region, Norway

et al. 2015

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Please cite this article as: Holder, Robert M., Hacker, Bradley R., Kylander-Clark, Andrew R.C., Cottle, John M., Monazite trace-element and isotopic signatures of (ultra)high-pressure metamorphism: Highlights• U-Pb dates and HREE indicate monazite recrystallization at UHP.• UHP monazites have high Sr and non-radiogenic Pb.• High Sr-Eu 2+ -Pb may result from feldspar breakdown at high pressure. AbstractMonazite U-Pb and trace-element data were gathered from six high-to ultrahigh-pressure (UHP) samples from the Western Gneiss Region, Norway, using LASS (laser-ablation split-stream ICP-MS) to investigate variations in monazite composition during high-pressure metamorphism. The UHP monazites were found to contain up to 7600 ppm Sr, 110 ppm non-radiogenic Pb, relatively weak negative Eu anomalies, and Y concentrations as low as 500 ppm. Amphibolite-facies monazite that rims the UHP monazite in one sample contains Y concentrations up to 1.6 wt %, Sr as low as 13 ppm, and no detectable non-radiogenic Pb. The UHP monazite composition (high Sr-Pb) is interpreted to result from growth in the absence of feldspar, possibly aided by increased compatibility of Sr-Pb-Eu 2+ in the monazite crystal structure at high pressure. Sr in monazite as a proxy for feldspar stability may be a useful tool not only in studying high-pressure metamorphism, but also in determining timescales of melting and crystallization, when the amount of feldspar changes over time.

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Deciphering igneous and metamorphic events in high-grade rocks of the Wilmington Complex, Delaware: Morphology, cathodoluminescence and backscattered electron zoning, and SHRIMP U-Pb geochronology of zircon and monazite

Cited by 381 publications

References 46 publications

Multiple stages of hydrothermal REE remobilization recorded in fluorapatite in the Paleoproterozoic Yinachang Fe–Cu–(REE) deposit, Southwest China

Multiple stages of hydrothermal REE remobilization recorded in fluorapatite in the Paleoproterozoic Yinachang Fe–Cu–(REE) deposit, Southwest China

Gangdese retroarc thrust belt and foreland basin deposits in the Damxung area, southern Tibet

Monazite trace-element and isotopic signatures of (ultra)high-pressure metamorphism: Examples from the Western Gneiss Region, Norway

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