In situ simultaneous determination of trace elements, U-Pb and Lu-Hf isotopes in zircon and baddeleyite

Xie, Lie‐Wen; Zhang, Yanbin; Zhang, Hui-Huang; Sun, Jiantong; Wu, Fu‐Yuan

doi:10.1007/s11434-008-0086-y

Cited by 415 publications

(181 citation statements)

References 42 publications

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“…Measured 176 Hf/ 177 Hf ratios were normalized to 179 Hf/ 177 Hf=0.7325. Further external adjustment is not applied for the unknowns because our determined 176 Hf/ 177 Hf ratios of 0.2820209±0.0000065 for zircon standards GJ-1 are in good agreement with the reported values [21].…”

Section: Sampling and Analytical Proceduressupporting

confidence: 81%

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Tao

et al. 2013

Sci. China Earth Sci.

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Early Yanshanian (Jurassic) granitoids are widespread in the Nanling Range, South China. Whereas large granitic batholiths commonly crop out in the center of the Nanling Range (corresponding geographically to the central and northern parts of Guangdong Province), many small stocks occur in the southern part of Jiangxi Province. Most of the small stocks are associated closely with economically significant rare-metal deposits (W, Sn, Nb, Ta). Here we report the results for biotite granites and two-mica granites from three Yanshanian stocks of the Longyuanba complex. LA-ICPMS U-Pb dating of zircon yields an age of 156.1±2.1 Ma for Xiaomubei biotite granite, and U-Pb zircon dating using SIMS yields an age of 156.7±1.2 Ma for Longyuanba-Chengjiang biotite granite and 156.4±1.3 Ma for Jiangtoudong two-mica granite. Biotite granites are silica-rich (SiO 2 =70%-79%), potassic (K 2 O/Na 2 O>1.9), and peraluminous (ASI=1.05-1.33). Associated samples are invariably enriched in Rb, Th, Pb and LREE, yet depleted in Ba, Nb, Sr, P and Ti, and their REE pattern shows a large fractionation between LREE and HREE ((La/Yb) N =10.7-13.5) and a pronounced Eu negative anomaly (δEu=0.28-0.41). Two-mica granite samples are also silica-rich (SiO 2 =75%-79%), potassic (K 2 O/Na 2 O>1.2), and peraluminous (ASI=1.09-1.17). However, in contrast to the biotite granites, they are more enriched in Rb, Th, Pb and extremely depleted in Ba, Nb, Sr, P and Ti, and exhibit nearly flat ((La/Yb) N =0.75-1.08) chondrite-normalized REE patterns characterized by strong Eu depletion (δEu=0.02-0.04) and clear tetrad effect (TE 1.3 =1.10-1.14). Biotite granites and two-mica granties have comparable Nd isotopic signatures, and their εNd(t) are concentrated in the 13.0 to 9.6 and 11.5 to 7.7 respectively. Their zircon Hf-O isotopes of both also show similarity (biotite granites: εHf(t)=10.8-7.9, δ 18 O=7.98‰-8.89‰ and εHf(t)= 13.8 to 9.1, δ 18 O=8.31‰-10.08‰; two-mica granites: εHf(t)=11.3 to 8.0, δ 18 O=7.91‰-9.77‰). The results show that both biotite and two-mica granites were derived mainly from sedimentary source rocks with a minor contribution from mantle-derived materials. In spite of some S-type characteristics, the biotite granites were formed by fractional crystallization of I-type magma and assimilation of peraluminous sedimentary rocks during their ascent to the surface. Therefore, they belong to highly fractionated I-type granites. Two-mica granites exhibit a tetrad effect in their REE patterns, but share the same isotopic features with the biotite granites, suggesting that they are highly fractionated I-type granites as well. Their Lanthanide tetrad effects may be attributed to the hydrothermal alteration by magmatic fluids that have suffered degassing at late stages. Granitic magmas undergoing fractional crystallization and wall-rock assilimation can generate highly evolved granites with no REE tetrad effect in the uni-phase system. However, in the late-stage of magmatic evolution in the multi-phase system (i.e., magmatic-hydrothermal s...

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Section: Sampling and Analytical Proceduressupporting

confidence: 81%

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Tao

et al. 2013

Sci. China Earth Sci.

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“…LA-ICPMS zircon U-Pb dating for sample PIII-02 were conducted at the MC-ICPMS laboratory of the Institute of Geology and Geophysics, Chinese Academy of Sciences (IGG CAS) in Peking, China. Detailed operating conditions for the laser ablation system and the ICP-MS instrument and data reduction were the same as described by Xie et al (2008). An Agilent 7500a quadruple (Q)-ICPMS and a Neptune multi-collector (MC)-ICPMS with a 193 nm excimer ArF laser-ablation system (GeoLas Plus) attached were used for simultaneous determination of zircon U-Pb ages.…”

Section: Methodsmentioning

confidence: 99%

Petrogenesis of the Early Eocene adakitic rocks in the Napuri area, southern Lhasa: Partial melting of thickened lower crust during slab break-off and implications for crustal thickening in southern Tibet

Wang

Jiang

et al. 2014

Lithos

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“…The analytical method for U-Pb age is the same as those described in Xie et al (2008). The fractionation correction and results were calculated using GLITTER 4.0 (Jackson et al, 2004) and then corrected using the Harvard zircon 91 500 as external standard.…”

Section: Methodsmentioning

confidence: 99%

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

Zhang

Dong

Cai

et al. 2014

Earth and Planetary Science Letters

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In situ simultaneous determination of trace elements, U-Pb and Lu-Hf isotopes in zircon and baddeleyite

Cited by 415 publications

References 42 publications

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Petrogenesis of the Early Eocene adakitic rocks in the Napuri area, southern Lhasa: Partial melting of thickened lower crust during slab break-off and implications for crustal thickening in southern Tibet

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

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