A new practical isobaric interference correction model for the<i>in situ</i>Hf isotopic analysis using laser ablation-multi-collector-ICP-mass spectrometry of zircons with high Yb/Hf ratios

Gu, Hai‐Ou; Sun, He; Wang, Fangyue; Ge, Cui; Zhou, Taofa

doi:10.1039/c9ja00024k

Cited by 47 publications

(15 citation statements)

References 39 publications

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“…Standard zircons (including Qinghu, Plešovice, Penglai, 91500, GJ-1) were used as quality control during the analytical process. All the data were reduced offline using LAZrnHf-Calculator@HFUT and the newly proposed isobaric correction model of [39]. Analytical results of standard zircons measured simultaneously are given and initial 176 Hf/ 177 Hf values were calculated based on a Lu decay constant of 1.865 × 10 −11 [40].…”

Section: Lu-hf Isotopic Analysesmentioning

confidence: 99%

Origin and Geodynamic Mechanism of the Tibetan Demingding Porphyry Mo (Cu) Deposit from Oceanic Subduction to Continental Collision

Dong

Zhou

et al. 2022

Minerals

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Demingding is a promising porphyry Mo-dominated deposit recently discovered in the eastern Gangdese metallogenic belt in Tibet, China. We present zircon U-Pb-Lu-Hf isotopic studies, as well as geochemical data of the late monzogranites and the prior rhyolites from the Demingding porphyry deposit to uncover their origin and geodynamic mechanism. Zircon U–Pb dating yielded precise crystallization ages of 17.3 ± 0.6 Ma (MSWD = 2.5) and 186.5 ± 3.0 Ma (MSWD = 2.0) for monzogranite and rhyolite, respectively. The monzogranite is characterized by high-K calc-alkaline, adakitic affinities, and positive zircon εHf(t) values (+0.9∼+5.6, avg.+3.1) with TDM2 (0.73–1.04 Ga), while the rhyolite has εHf(t) values of (+2.1∼+7.3, avg.+5.2) and TDM2 of (0.76–1.09 Ga) similar to the monzogranite. Our results suggest that the Demingding porphyry Mo (Cu) deposit is related to magma generated from the Neo-Tethyan oceanic subduction. The subsequent monzogranite porphyry was likely formed by the remelting of previously subduction-modified arc lithosphere, triggered by continental collision crustal thickening in Miocene. The lower positive εHf(t) values of monzogranites suggest minor inputs from the Mo-rich ancient crust, suggesting that Mo favors the silicate melt. Such magmatic events and special metallogenesis typify intracontinental processes and porphyry copper deposits, which are normally confined to oceanic subduction and Cu-dominated style, thereby making the continental setting and Mo-dominated style of Demingding exceptional and possibly unique.

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Section: Lu-hf Isotopic Analysesmentioning

confidence: 99%

Origin and Geodynamic Mechanism of the Tibetan Demingding Porphyry Mo (Cu) Deposit from Oceanic Subduction to Continental Collision

Dong

Zhou

et al. 2022

Minerals

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“…Their recommended workflow was proposed as best practice for assuring that steps taken in data correction and interpretation were robust and rooted in fundamental geological, isotopic and analytical constraints. A new isobaric interference correction model was proposed 289 for in situ determinations of Hf isotope ratios in zircons, especially those with high Yb/Hf ratios. This LA-MC-ICP-MS procedure employed a specified zircon RM to calculate the mass bias factors that were then applied to other samples.…”

Section: Analysis Of Geological Materialsmentioning

confidence: 99%

Atomic spectrometry update – a review of advances in environmental analysis

Bacon

Butler

Cairns

et al. 2021

J. Anal. At. Spectrom.

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“…A mixed gas of helium (0.9 L/min) and argon (0.9 L/min) was applied as the carrier gas to efficiently transport the aerosol to the MC-ICP-MS. Standard zircons (including Qinghu, Plešovice, Penglai) were analyzed to monitor the instrument status, analytical precision and accuracy. All the data were reduced offline with LAZrnHf-Calculator@HFUT (Gu et al, 2019). The results are given in Table 2.…”

Section: Zircon Lu-hf Isotopesmentioning

confidence: 99%

Neoproterozoic Crustal Reworking and Growth in the Zhangbaling Uplift, Tan–Lu Fault Zone: Evidence from the Feidong Complex and Zhangbaling Group

Niu

Cai

et al. 2020

Acta Geologica Sinica (Eng)

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Intensive mid‐Neoproterozoic magmatism is the salient feature of the Yangtze Block, preserving abundant information about crustal reworking and growth. Zircon U–Pb–Lu–Hf isotope analysis was performed on material from the Feidong Complex (FDC) and Zhangbaling Group (ZBLG) of the Zhangbaling Uplift, in order to determine the age and magmatic source of the Neoproterozoic igneous rocks as well as the detrital provenance for the sedimentary rocks, to further provide important data for understanding the mid‐Neoproterozoic crustal evolution of the Northeast Yangtze Block. The amphibolite and gneissic granites in the Feidong Complex (FDC) gave similar protolith ages of 782–776 Ma. The synmagmatic zircons exhibited variable negative ∊Hf(t) values of –26.9 to –8.3. Early (ca. 2.4 Ga) to late Paleoproterozoic (ca. 2.0–1.9 Ga) inherited zircons were found in the gneissic monzogranite, with negative ∊Hf(t) values of –11.2 to –7.2, indicating strong reworking of the ancient crustal materials of the Northeast Yangtze Block. Whereas the amphibolites represent minor crustal growth through emplacement of continental rifting‐related mafic magmas. The quartz–keratophyres in the Xileng Formation of the ZBLG in contrast systematically yield young protolith crystallization ages of 754–727 Ma with high ∊Hf(t) values of –2.0 to +5.6, indicating their derivation from the reworking of juvenile crustal materials. The detrital zircons from the metasiltstone in the Beijiangjun Formation yield variable 206Pb/238U ages (871–644 Ma) with a peak age at 741 ± 11 Ma and ∊Hf(t) values of –4.3 to +5.3, which is consistent with those of the Xileng Formation, but distinct from the FDC, indicating that the provenance of the metasiltstone is primarily the underlying Xileng Formation. The mid‐Neoproterozoic igneous and sedimentary rocks of the Zhangbaling Uplift were products from continental rifting zones along the northern margin of the Yangtze Block, situated in different positions from the Susong Complex and the Haizhou Group. The transition from ancient to juvenile crustal sources for felsic magmatic rocks is attributed to gradually increased crustal extension during continental rifting.

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A new practical isobaric interference correction model for thein situHf isotopic analysis using laser ablation-multi-collector-ICP-mass spectrometry of zircons with high Yb/Hf ratios

Abstract: An isobaric interference correction model was proposed for the in situ Hf isotopic analysis of zircons with high Yb/Hf ratios using LA-MC-ICP-MS.

Cited by 47 publications

References 39 publications

Origin and Geodynamic Mechanism of the Tibetan Demingding Porphyry Mo (Cu) Deposit from Oceanic Subduction to Continental Collision

Origin and Geodynamic Mechanism of the Tibetan Demingding Porphyry Mo (Cu) Deposit from Oceanic Subduction to Continental Collision

Atomic spectrometry update – a review of advances in environmental analysis

Neoproterozoic Crustal Reworking and Growth in the Zhangbaling Uplift, Tan–Lu Fault Zone: Evidence from the Feidong Complex and Zhangbaling Group

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