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12. Zircon effect alone insufficient to generate seawater Nd-Hf isotope relationships

Author

Chen, Tianyu, Ling, Hong-Fei, Frank, Martin, Zhao, Kui-Dong, and Jiang, Shao-Yong

Abstract

[1] Many studies have suggested that continental weathering inputs have controlled the dissolved oceanic budget of hafnium (Hf). However, whether the offset of seawater Nd‐Hf isotope compositions from the terrestrial array can be fully generated by incongruent weathering of continental rocks (the zircon effect) is still not well constrained. In recent years, an increasing amount of combined U‐Pb ages and Hf‐isotopic compositions of riverine detrital zircons have been published. Here a new model of the Nd‐Hf isotopic compositions of the weathered zircon‐free part of the upper continental crust is presented, which is based on published Hf isotope compositions and formation ages of modern riverine detrital zircons combined with Nd isotopic compositions of rocks from the upper continental crust. Our model results indicate that the Nd‐Hf isotopic composition of the weathered zircon‐free part of the upper continental crust is not consistent with the seawater isotopic compositions. This suggests that the elevated seawater Hf isotope compositions for given Nd isotope compositions cannot be fully explained by incongruent zircon weathering of the continents, which is also supported by a recent study demonstrating incongruent weathering of other minerals than zircon.

Published
2011

15. Uranium-bearing and barren granites from the Taoshan complex, Jiangxi province, south China: geochemical and petrogenetic discrimination and exploration significance.

Author

Zhao Kui-Dong, Chen Pei-Rong, Chen Wei-Feng, Dong Chen-Yang, Jiang Shao-Yong, Ling Hong-Fei, Wang Kai-Xing., Zhang Jian, Zhao Kui-Dong, Chen Pei-Rong, Chen Wei-Feng, Dong Chen-Yang, Jiang Shao-Yong, Ling Hong-Fei, Wang Kai-Xing., and Zhang Jian

Abstract

LA-ICP-MS zircon U-Pb geochronology data indicate that the U-bearing Daguzhai granite and the U-barren Huangpi granite in the Taoshan complex were both emplaced at 154 +/-2 Ma. The Daguzhai granite has higher Al2O3/CaO+Na2O+K2O ratios and P2O5 contents and lower CaO contents than the Huangpi granite and is more enriched in Rb, Ba and U and more depleted in Sr, Eu and Ti. The granites have different Sr-Nd isotopic compositions and the Daguzhai granite belongs to peraluminous S-type and the Huangpi granite to fractioned I-type. The Daguzhai granite may be derived from the partial melting of parametamorphic rocks in the Zhoutan group, while the Huangpi granite may be derived from the partial melting of the mixing zone of ortho- and parametamorphic rocks in the Zhoutan group. It is suggested that the different U contents in the granites were controlled by different magma sources., LA-ICP-MS zircon U-Pb geochronology data indicate that the U-bearing Daguzhai granite and the U-barren Huangpi granite in the Taoshan complex were both emplaced at 154 +/-2 Ma. The Daguzhai granite has higher Al2O3/CaO+Na2O+K2O ratios and P2O5 contents and lower CaO contents than the Huangpi granite and is more enriched in Rb, Ba and U and more depleted in Sr, Eu and Ti. The granites have different Sr-Nd isotopic compositions and the Daguzhai granite belongs to peraluminous S-type and the Huangpi granite to fractioned I-type. The Daguzhai granite may be derived from the partial melting of parametamorphic rocks in the Zhoutan group, while the Huangpi granite may be derived from the partial melting of the mixing zone of ortho- and parametamorphic rocks in the Zhoutan group. It is suggested that the different U contents in the granites were controlled by different magma sources.

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