In situ U–Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada

Wu, Fu Yuan; Yang, Yue; Mitchell, Roger H.; Li, Qiuli; Jin, Yang; Zhang, Yan Bin

doi:10.1016/j.lithos.2009.12.010

Cited by 85 publications

(62 citation statements)

References 94 publications

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“…The patterns of distribution of chondritenormalized REE compositions in perovskites from kimberlites of South Africa and Somerset province are the lines with a very steep negative slope that are almost identical in configuration and location. By the nature of their REE patterns, the perovskites studied by [124], in many respects are similar to the patterns of mineral samples from Alto Paranaiba Province, Benfontein sill and Wesselton province (Fig. 12).…”

Section: Perovskitessupporting

confidence: 59%

“…In addition, the total REE content in the outer zone of the perovskite grain from kimberlites of Pantano manifestation of the same province also turned out to be significantly lower than in its inner zone. Studies on regularities of distribution of REE and other impurities in perovskites from some kimberlite occurrences of South Africa and Somerset Province (Canada), which were conducted by [124], showed that the total REE compositions in the mineral samples from the occurrences of Southern Africa vary from 10 300 to 46 773 ppm, and the values for (La/Yb) -from 179 to 677. In perovskites of Somerset Province the total REE compositions ranged from 23 438 to 37 004 ppm, values for (La/Yb) − from 381 to 788.…”

Section: Perovskitesmentioning

confidence: 99%

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Consistent patterns of rare earth element distribution in accessory minerals from rocks of mafic-ultramafic complexes

Lesnov

2013

Open Geosciences

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This paper summarizes analytical data accumulated in the world literature and other materials about the regularities of the REE distribution in minerals contained in ultramafic and mafic rocks as accessory phases. These minerals are tentatively divided into two groups. The first includes garnets, zircons, apatites and perovskites, which can accumulate increased amounts of REE in their structure. The second consists of minerals whose structure can accumulate only limited contents of these trace elements. These are chrome-spinels, ilmenites, and micas. These minerals, in respect of REE geochemistry, are studied to a varying degree because of the different levels of accumulations of these elements, different degrees of occurrence in rocks, tiny sizes of their grains and other reasons. The analytical database formed on their basis includes about 600 original analyses. The overwhelming majority of presently available data on REE geochemistry in accessory minerals from ultramafic and mafic rocks have been published only in the recent 15 years. The studies became possible due to the development and introduction of new highly sensible microprobe analyses allowing detection of REE and many other trace elements in minerals grains directly in thin sections. The greatest numbers of these analyses were performed for garnets and zircons, fewer for apatites, and the fewest for chrome-spinels, ilmenites, micas, and perovskites. In general, the regularities of REE distribution in these minerals from ultramafic and mafic rocks are less studied compared to the rock-forming minerals from ultramafic and mafic rocks. Among the analytical methods, which were used to study the REE composition of accessory minerals, the most efficient was the mass-spectrometry with inductively coupled plasma (ICP-MS).Keywords: REE distribution • ultramafic and mafic rocks • accessory minerals © Versita Sp. z o.o.

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Section: Perovskitessupporting

confidence: 59%

Section: Perovskitesmentioning

confidence: 99%

Consistent patterns of rare earth element distribution in accessory minerals from rocks of mafic-ultramafic complexes

Lesnov

2013

Open Geosciences

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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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“…There are a number of analytical techniques that have been used to determine U-Pb dates of kimberlites including isotope dilution thermal ionization mass spectrometry (IDTIMS; e.g., Heaman 1989;Smith et al 1989;Heaman and Kjarsgaard 2000), laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS; e.g., Cox and Wilton 2006;Simonetti et al 2008;Batumike et al 2008;Yang et al 2009;Wu et al 2010), and secondary ion mass spectrometry Kinny et al 1997;Li et al 2010;Chalapathi Rao et al 2013;Wu et al 2013). For IDTIMS analyses the sample material is dissolved in acids, U and Pb purified using anion exchange chromatography, and their isotopic compositions determined using a thermal ionization mass spectrometer (Heaman 1989 (Fig.…”

Section: U-pb Geochronology Of Kimberlite Mineralsmentioning

confidence: 99%

Uranium-Lead, Rubidium-Strontium, Kimberlite

Heaman¹

2013

Encyclopedia of Scientific Dating Methods

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In situ U–Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada

Cited by 85 publications

References 94 publications

Consistent patterns of rare earth element distribution in accessory minerals from rocks of mafic-ultramafic complexes

Consistent patterns of rare earth element distribution in accessory minerals from rocks of mafic-ultramafic complexes

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

Uranium-Lead, Rubidium-Strontium, Kimberlite

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