In situ U–Pb SIMS (IN-SIMS) micro-baddeleyite dating of mafic rocks: Method with examples

Chamberlain, Kevin R.; Schmitt, Axel K.; Swapp, Susan M.; Harrison, T. Mark; Swoboda-Colberg, Norbert; Bleeker, Wouter; Peterson, T D; Jefferson, C W; Khudoley, A. K.

doi:10.1016/j.precamres.2010.05.004

Cited by 91 publications

(45 citation statements)

References 27 publications

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“…It is younger than the 1750 Ma Kivalliq Igneous Suite with its related epithermal quartz veins and silicification, as is the Athabasca Group (Rainbird and Davis, 2007;Jefferson et al, 2013;Peterson et al, 2015). The top of siliciclastic sedimentation for each basin is constrained at 1540 Ma (Creaser and Stasiuk, 2007;Chamberlain et al, 2010). More loosely constrained between 1750 and 1270 Ma are the lithologically similar Dessert Lake, Hornby Bay, and Elu basins (inset Fig.…”

Section: Geologic Settingmentioning

confidence: 99%

Geochronology and Genesis of the Bong Uranium Deposit, Thelon Basin, Nunavut, Canada

Sharpe¹,

Fayek²,

Quirt³

et al. 2015

Economic Geology

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The Thelon basin, Nunavut, shares many similarities with the uranium-producing Athabasca basin, Saskatchewan; however, the uranium deposits associated with the Thelon basin are still poorly understood. The Kiggavik project area (AREVA Resources Canada) is located near the northeastern terminus of the Thelon basin and comprises multiple uranium deposits hosted exclusively in basement rocks. The Bong deposit is hosted dominantly by Neoarchean metagraywacke of the Woodburn Lake group. A five-phase metallogenetic model is proposed for the Bong deposit, with three stages of uraninite identified. The premineralization phase is characterized by host-rock silicification. Mineralization is separated into three main stages. Stage 1 uraninite (U1; ca. 1500 Ma) is preserved in highly fractured and altered disseminated grains that are overgrown by later stages of uraninite. Stage 2 uraninite (U2; ca. 1100 Ma) forms veinlets parallel to D1 foliation and coats and fills fractures in organic matter nodules and blebs. Stage 2 uraninite is associated with pervasive illite that formed from ~190°C fluids (δ 18 O: -6.4‰, δ 2 H: -97‰), which remobilized much of Stage 1 uraninite and completely overprinted Stage 1 alteration. At ~1000 Ma an oxidizing fluid deposited uraninite along redox fronts (U3) while altering and remobilizing Stage 1 and 2 uraninite. Post-uranium-oxide minerals include drusy quartz, calcite, and illite accompanied by uranyl phases (e.g., uranophane, Ca-U).

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Section: Geologic Settingmentioning

confidence: 99%

Geochronology and Genesis of the Bong Uranium Deposit, Thelon Basin, Nunavut, Canada

Sharpe¹,

Fayek²,

Quirt³

et al. 2015

Economic Geology

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“…At this point, the development of geochronological methods for other accessory minerals is urgently required. For example, numerous studies have been conducted on baddeleyites from mafic-ultramafic rocks and perovskites from kimberlites (such as [1][2][3][4]). Nevertheless, it is difficult to determine the deposition age of siliciclastic sedimentary rock because of the lack of appropriate minerals for isotopic dating.…”

mentioning

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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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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“…These U-bearing accessory minerals allow essentially all short bursts of LIP magmatism to be dated precisely and accurately (e.g., Chamberlain et al, 2010;Heaman and LeCheminant, 1993;Krogh et al, 1987;Li et al, 2010;Rioux et al, 2010;Söderlund and Johansson, 2002;Wingate et al, 2002).…”

Section: The Lip Methods For Paleocontinental Reconstructionmentioning

confidence: 99%

Large Igneous Provinces and supercontinents: Toward completing the plate tectonic revolution

Ernst

Bleeker

Söderlund

et al. 2013

Lithos

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In situ U–Pb SIMS (IN-SIMS) micro-baddeleyite dating of mafic rocks: Method with examples

Cited by 91 publications

References 27 publications

Geochronology and Genesis of the Bong Uranium Deposit, Thelon Basin, Nunavut, Canada

Geochronology and Genesis of the Bong Uranium Deposit, Thelon Basin, Nunavut, Canada

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

Large Igneous Provinces and supercontinents: Toward completing the plate tectonic revolution

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