Obtaining diagenetic ages from metamorphosed sedimentary rocks: U-Pb dating of unusually coarse xenotime cement in phosphatic sandstone

Vallini, Daniela A.; Rasmussen, Birger; Krapež, Bryan; Fletcher, Ian R.; McNaughton, Neal J.

doi:10.1130/0091-7613(2002)030<1083:odafms>2.0.co;2

Cited by 51 publications

(20 citation statements)

References 5 publications

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“…Nevertheless, it is difficult to determine the deposition age of siliciclastic sedimentary rock because of the lack of appropriate minerals for isotopic dating. Fortunately, U-Pb dating method of xenotime recently has been developed using SHRIMP, which provides an excellent approach to determine the age of siliciclastic sedimentary rock [5][6][7][8][9]. As a result, U-Pb dating of xenotime has received extensive attention and its applications have expanded rapidly.…”

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confidence: 99%

“…This mineral is enriched in rare earth elements (REE), and is an ideal candidate for U-Pb dating because of its high content of U and negligible content of common Pb. Currently, in situ dating of xenotime is commonly conducted by ion microprobe [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], which can yield precise and accurate ages. However, the expense of this instrumentation hinders the wide application of this technique.…”

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confidence: 99%

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In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS

Liu

Guo

et al. 2011

Chin. Sci. Bull.

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Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb. These characteristics, and the fact that it is widespread throughout various types of rocks, suggest that the U-Th-Pb dating of xenotime has broad applications. Studies of U-Pb dating on xenotime by ion microprobe (such as SHRIMP) have increased in recent years, whereas studies by laser ablation (LA)-ICP-MS are still rare. In this study, we developed a technique for U-Pb dating of xenotime using the 193 nm ArF laser-ablation system and Agilent 7500a Q-ICP-MS. To evaluate the reliability of our method, a xenotime standard, BS-1, was analyzed and calibrated against another xenotime standard, MG-1. The weighted mean 206 Pb/ 238 U ages of 510.1 ± 5.2 Ma (2 n = 21), 509.8 ± 4.3 Ma (2 n = 21) and 510.0 ± 4.6 Ma (2n = 21) were obtained using beam diameters of 16, 24 and 32 m, respectively. These ages are identical to those determined by ID-TIMS method (weighted mean 206 Pb/ 238 U age of 508.8 ± 1.4 Ma), which supports the reliability of our LA-ICP-MS method. We also analyzed xenotimes in leucogranites from South Tibet and granites from Xihuashan in southern China, and obtained accurate and precise ages. Nevertheless, we observed systematic differences in Pb/U fractionation among xenotime, monazite and zircon. The matrix-effect resulted in either under-correction or over-correction of fractionation, and thus led to inaccurate ages. Thus, a matrix-matched material is required for U-Pb dating of xenotime by LA-ICP-MS.

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confidence: 99%

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confidence: 99%

In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS

Liu

Guo

et al. 2011

Chin. Sci. Bull.

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“…In situ SHRIMP U-Pb geochronology of diagenetic xenotime in phosphatic sandstone from the Trilogy drillhole ( Fig. 1) suggests that the succession is older than 1696 ± 7 Ma (Vallini et al, 2002), whereas detrital zircon grains in quartzites from Barrens Beach, No Tree Hill and Steere River (Fig. 1) indicate a maximum age of $1790 Ma Nelson, 1996Nelson, , 2001Dawson et al, 2002).…”

Section: Mount Barren Groupmentioning

confidence: 97%

“…where in the Mount Barren Group (Vallini et al, 2002(Vallini et al, , 2005unpub. data), did not survive prograde amphibolite facies metamorphism.…”

Section: Implications For Monazite Geochronologymentioning

confidence: 99%

In situ SHRIMP U–Pb dating of monazite integrated with petrology and textures: Does bulk composition control whether monazite forms in low-Ca pelitic rocks during amphibolite facies metamorphism?

Rasmussen

Muhling

Fletcher

et al. 2006

Geochimica et Cosmochimica Acta

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“…In recent years, SHRIMP U-Th-Pb analysis of xenotime has been increasingly applied to dating the diagenesis and low-grade metamorphism of clastic sedimentary rocks (McNaughton et al, 1999;Fletcher et al, 2000;Vallini et al, 2002). However, there have been relatively few SHRIMP studies of authigenic and low-grade metamorphic monazite.…”

Section: Introductionmentioning

confidence: 99%

Mesozoic monazite in Neoproterozoic metasediments: Evidence for low-grade metamorphism of Sinian sediments during Triassic continental collision, Liaodong Peninsula, NE China

et al. 2007

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Sericite phyllite from the Sinian Shisanlitai Formation, Dalian area, Liaodong Peninsula, NE China, contains an assemblage of newly-formed lower-greenschist facies minerals (sericite, chlorite, Fe minerals and Ti minerals) plus aggregates of fine-grained monazite. The texture of the monazite, its mineral inclusions, and its close association with Fe oxide minerals show that it is not detrital or diagenetic, but a product of the low-grade metamorphism. SHRIMP U-Th-Pb dating of the monazite at 217 ± 15 Ma shows that the metamorphism, and associated regional deformation and fluid flow, occurred in the Late Triassic, coeval with the waning stages of the Dabie-Sulu orogeny. The Dabie-Sulu tectonothermal event has produced both deformation and metamorphism in rocks of the eastern North China Block at least up to ~200 km north of the main continent-continent collision zone.

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Obtaining diagenetic ages from metamorphosed sedimentary rocks: U-Pb dating of unusually coarse xenotime cement in phosphatic sandstone

Cited by 51 publications

References 5 publications

In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS

In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS

In situ SHRIMP U–Pb dating of monazite integrated with petrology and textures: Does bulk composition control whether monazite forms in low-Ca pelitic rocks during amphibolite facies metamorphism?

Mesozoic monazite in Neoproterozoic metasediments: Evidence for low-grade metamorphism of Sinian sediments during Triassic continental collision, Liaodong Peninsula, NE China

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