Comment: Hf-isotope heterogeneity in zircon 91500

Griffin, William L.; Pearson, Norman J.; Белоусова, Е. А.; Saeed, Ayesha

doi:10.1016/j.chemgeo.2006.03.007

Cited by 310 publications

(89 citation statements)

References 13 publications

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“…Measured 176 Hf/ 177 Hf ratios were normalized to 179 Hf/ 177 Hf = 0.7325. Further external adjustment was not applied for the unknowns because our determined 176 Hf/ 177 Hf ratios for zircon standards 91500 (0.282309 ± 0.000004) and GJ-1 (0.282000 ± 0.000008) were in good agreement within errors with the reported values (Griffin et al, 2006;Wu et al, 2006). Zircon Hf isotopic data are listed in Table 3.…”

Section: Zircon Lu-hf Isotopessupporting

confidence: 68%

Paleoproterozoic S-type granites in the Helanshan Complex, Khondalite Belt, North China Craton: Implications for rapid sediment recycling during slab break-off

Wei

Wang

et al. 2014

Precambrian Research

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a b s t r a c t S-type granites, typically derived from the rapid recycling of sedimentary rocks, are sometimes accompanied by contemporary mafic magmatism and granulite metamorphism. However, the geodynamic context for such rock suites is often highly disputed, with various model proposed, including back-arc basin opening, lithospheric delamination, mantle plume and continental rifting. The Paleoproterozoic Khondalite Belt in the North China Craton provides an example of synchronous mafic and felsic magmatism that was accompanied by granulite-facies metamorphic events for which the tectonic affinities of these rocks remains unclear. This study integrates in situ zircon Hf-O isotope analyses, whole-rock geochemistry and Nd isotope results for the earliest two-mica granites (ca. 1.95 Ga) in order to provide constraints on the above issues. The granites are strongly peraluminous (A/CNK value >1.1), and characterized by high zircon ␦18 O values of 7.3-10.6‰, corresponding to calculated magmatic ␦ 18 O values of 9.1-12.3‰, similar to those of typical S-type granites. They have relatively high and homogeneous ε Nd (t) values of −1.1 to +0.9 and highly variable zircon ε Hf (t) values ranging from −1.0 to +8.3. In situ zircon Hf-O isotopic compositions indicate that the S-type granites may contain some mantle or juvenile crustal components in addition to a sediment component. Based on the new results and published data, a slab break-off model is proposed to explain the rapid recycling of sedimentary precursors and the generation of the ca. 1.95 Ga S-type granites.

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Section: Zircon Lu-hf Isotopessupporting

confidence: 68%

Paleoproterozoic S-type granites in the Helanshan Complex, Khondalite Belt, North China Craton: Implications for rapid sediment recycling during slab break-off

Wei

Wang

et al. 2014

Precambrian Research

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“…Measured 176 Hf/ 177 Hf ratios were normalized to 179 Hf/ 177 Hf = 0.7325. Further external adjustment was not applied for the unknowns because our determined 176 Hf/ 177 Hf ratios for zircon standards 91500 (0.282308 ± 0.000004) and GJ-1 (0.282021 ± 0.000011) were in good agreement within errors with the reported values (Griffin et al, 2006;Wu et al, 2006;Zeh et al, 2007). Zircon Hf isotopic data are listed in Supplementary Table A.2.…”

Section: Zircon Lu-hf Isotopessupporting

confidence: 67%

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Wei

Wang

et al. 2015

Lithos

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“…No relationship between 176 Yb/ 177 Hf and 176 Hf/ 177 Hf ratios was observed in the studied samples, indicating that the correction of 176 Yb interference on 176 Hf is precise for obtaining accurate 176 Hf/ 177 Hf values. During analysis of the samples, the zircon standard 91500 applied for the instrumental mass fractionation gave 176 Hf/ 177 Hf = 0.282292 ± 14 (2 ), which is identical within error to the 176 Hf/ 177 Hf ratio of 0.282284 ± 22 reported by Griffin et al (2006). The uncertainties of calibrated isotope ratios include those from the sample, standards, and reference values, which are given at ±2 in Supplemental Table 3.…”

Section: Methodsmentioning

confidence: 61%

Episodic crustal growth in the southern segment of the Trans-North China Orogen across the Archean-Proterozoic boundary

Huang¹,

Wilde²,

Zhong³

2013

Precambrian Research

118

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Comment: Hf-isotope heterogeneity in zircon 91500

Cited by 310 publications

References 13 publications

Paleoproterozoic S-type granites in the Helanshan Complex, Khondalite Belt, North China Craton: Implications for rapid sediment recycling during slab break-off

Paleoproterozoic S-type granites in the Helanshan Complex, Khondalite Belt, North China Craton: Implications for rapid sediment recycling during slab break-off

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Episodic crustal growth in the southern segment of the Trans-North China Orogen across the Archean-Proterozoic boundary

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