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Zircon U-Pb ages and Hf isotopic characteristics of the Dehe biotite monzonitic gneiss pluton in the North Qinling orogen and their geological significance

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Abstract

The Dehe granitic pluton intruded the **ahe Group which is in the core complex of the North Qinling Orogenic Belt (NQOB). It shows gneissic bedding and possesses typical S-type granite minerals such as muscovite and garnet. LA-ICP-MS U-Pb isotopic dating of the Dehe granite yielded a weighted average age of 925±23 Ma which represents the emplacement age of the pluton. Most of the ɛHf(t) values are negative, and the two-stage model ages are consistent with the age of the Qinling Group. The isotope data show that the Dehe granite was formed in the following geological setting: in the syn-collision setting of the NQOB in the Neoproterozoic, crustal thickening induced partial melting of materials derived from the Qinling complex, and then the maga upwelled and intruded into the **ahe Group. The formation of the Dehe S-type granite implied the occurrence of a convergent event in the QOB during the Neoproterozoic.

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Correspondence to Laimin Zhu.

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Wang, F., Zhu, L., Li, J. et al. Zircon U-Pb ages and Hf isotopic characteristics of the Dehe biotite monzonitic gneiss pluton in the North Qinling orogen and their geological significance. Chin. J. Geochem. 30, 204–216 (2011). https://doi.org/10.1007/s11631-011-0502-x

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