Behavior of hafnium and neodymium isotopes in the crust: Constraints from Precambrian crustally derived granites

Vervoort, Jeff D.; Patchett, P. Jonathan

doi:10.1016/0016-7037(96)00201-3

Cited by 471 publications

(186 citation statements)

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“…Extensive isotopic studies of mantle and crustal rocks over the past decades have led to the wide perception that Lu-Hf and Sm-Nd isotopic systems behave in a similar fashion during magmatic processes, leading to the globally correlated terrestrial array in the Ɛ Nd -Ɛ Hf space (Salters and Hart, 1991;Vervoort and Patchett, 1996;Chauvel et al, 2008). Nevertheless, Nd-Hf isotopic decoupling has been documented and discussed in many mantle-derived rocks (Salters and Zindler, 1995;Bizimis et al, 2003;Nowell et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…The Nd-Hf isotopic decoupling in the crustal environment is expected, but this has not been well recognized. Garnet is a unique major phase that can significantly fractionate Lu/Hf and Sm/Nd ratios in the crust (Vervoort and Patchett, 1996). This is because garnet preferentially retains Lu over Hf without significantly fractionating Sm from Nd during magmatism (Green et al, 2000), i.e., ‫݀ܭ‬ ௨/ு ௧ ≫ 1 ܽ݊݀ ‫݀ܭ‬ ௌ /ேௗ ௧ ≥ 1.…”

Section: Introductionmentioning

confidence: 99%

“…The expected "garnet effect" on lower crustal rocks in terms of the Nd-Hf decoupling, however, appears to be rare and remains unclear (Vervoort and Patchett., 1996;Vervoort et al, 2000). This is partly because most Hf isotope data in the study of crustal rocks are largely zircon in situ analyses rather than whole rock data (It is common that in situ Ԑ Hf values in different zircons from single samples can have > 10-unit variation at a given whole rock Ԑ Nd ), and partly because most crustal granitoids or their sources are too young to develop anomalous Hf isotope ratios (Vervoort and Patchett., 1996).…”

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confidence: 99%

“…To illustrate the concept in detail, a few possible mineral assemblages during crustal anatexis (Rapp, 1991;Vervoort and Patchett, 1996) are examined and only minerals with great potential to cause fractionations between Lu-Hf and Sm-Nd systems are considered. Sources of granitoid magmatism are mostly mafic to intermediate rocks.…”

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confidence: 99%

“…Values are from Vervoort and Patchett (1996) who made the pioneering effort to model the effect of garnet on Nd-Hf isotopic decoupling in the lower crust environment. The results are summarized in Fig.…”

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confidence: 99%

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Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Huang

Niu

2017

Lithos

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Huang

Niu

2017

Lithos

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U-Pb and Hf isotope analysis of detrital zircons from Mesozoic strata of the Gravina belt, southeast Alaska

et al. 2015

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The Gravina belt consists of Upper Jurassic through Lower Cretaceous marine clastic strata and mafic-intermediate volcanic rocks that occur along the western flank of the Coast Mountains in southeast Alaska and coastal British Columbia. This report presents U-Pb ages and Hf isotope determinations of detrital zircons that have been recovered from samples collected from various stratigraphic levels and from along the length of the belt. The results support previous interpretations that strata in the western portion of the Gravina belt accumulated along the inboard margin of the Alexander-Wrangellia terrane and in a back-arc position with respect to the western Coast Mountains batholith. Our results are also consistent with previous suggestions that eastern strata accumulated along the western margin of the inboard Stikine, Yukon-Tanana, and Taku terranes and in a fore-arc position with respect to the eastern Coast Mountains batholith. The history of juxtaposition of western and eastern assemblages is obscured by subsequent plutonism, deformation, and metamorphism within the Coast Mountains orogen, but may have occurred along an Early Cretaceous sinistral transform system. Our results are inconsistent with models in which an east-facing subduction zone existed along the inboard margin of the Alexander-Wrangellia terrane during Late Jurassic-Early Cretaceous time.

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Spatiotemporal reconstruction of Late Mesozoic silicic large igneous province and related epithermal mineralization in South China: Insights from the Zhilingtou volcanic‐intrusive complex

Wang

Zhao

et al. 2016

JGR Solid Earth

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Silicic large igneous provinces (SLIPs) generally reflect large‐scale melting of lower crustal materials and represent significant metal reservoirs. The South China Block‐Coastal Region (SCB‐CR) SLIP hosts several large epithermal deposits. To better understand these deposits, we document the spatiotemporal framework of the host SLIP across the SCB‐CR. Using zircon U‐Pb dating and geochemical and isotopic analysis, we identify four stages of emplacement. Stage 1 felsophyre (circa 149 Ma) shows a chemical affinity to highly fractionated I‐type granites. Stages 2 and 3 of low‐Mg felsic volcanics (circa 128 to 111 Ma) and stage 4 felsite (circa 100 Ma) have higher εHf(t) and εNd(t) values than stage 1 felsophyre, suggesting a significant contribution of newly underplated juvenile crust to the magma sources. Stage 4 diabase (circa 101 Ma) was likely produced by melting of subduction˗metasomatized asthenospheric mantle. Together with reliable published data, we build a new spatiotemporal framework of volcanics and infer that the majority of the SCB‐CR SLIP was related to the gradual northwestward subduction of the Izanagi plate beneath South China in a continental arc setting during circa 170 to 110 Ma, and minor contribution was from the eastward retreat of the subducting slab in a back‐arc setting during circa 110 to 90 Ma. We conclude that the large‐scale epithermal mineralization was generated by melting of the metal‐rich, thin (30–40 km), newly underplated hydrous juvenile crust during the tectonic transition from arc to back‐arc settings.

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Behavior of hafnium and neodymium isotopes in the crust: Constraints from Precambrian crustally derived granites

Cited by 471 publications

References 53 publications

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

U-Pb and Hf isotope analysis of detrital zircons from Mesozoic strata of the Gravina belt, southeast Alaska

Spatiotemporal reconstruction of Late Mesozoic silicic large igneous province and related epithermal mineralization in South China: Insights from the Zhilingtou volcanic‐intrusive complex

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