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Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting

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Abstract

Paleozoic granites can provide important insights of crustal differentiation and collision process of the North Qinling terrane. The Dafanggou leucogranites that intruded in the Qinling Complex is a Paleozoic granite with zircon U-Pb age of 404±6.4 Ma (MSWD=0.13, n=9). The leucogranites display moderate SiO2 (68.4 wt.% to 71.7 wt.%) content and high Na2O/K2O (1.07 to 2.74) and Sr/Y (42 to 65) ratios, and low A/CNK (1.04 to 1.08) and Rb/Sr (0.09 to 0.16) ratios. Combined with negative εNd(t) (−10.4) and εHf(t) (− 9.35 to −0.25) values and ancient TDM2 ages (1.2 to 1.7 Ga), suggesting the leucogranite are derived from ancient amphibolitic crust in the Qinling Group. In addition, the absence of coeval mafic igneous rocks or mafic enclaves occurred in the Dafanggou pluton and the low TZrn (∼700 °C) of leucogranites preclude that the leucogranites derived from high temperature dehydration melting of amphibolite. Thus, we propose that the occurrence of the Dafanggou leucogranite indicates that water-flux melting of middle-lower crust in postcollision setting may be a potential model for the genesis of granites in collisional orogenic belt.

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Acknowledgments

This work was supported by the Project of the Youth Science and Technology New Star in Shaanxi Province (No. 2017KJXX-94), the National Natural Science Foundation of China (Nos. 41102037, 41421002), the Project of Investigation and Evaluation of Uranium Resources (No. DD2016013623), the National Excellent Doctoral Dissertation of China (No. 201324). The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1335-5.

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  1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, 710069, China

    Jiangbo Wang, Tong Li & Yan Zhang

  2. Research Institute No. 203, CNNC, Xianyang, 712000, China

    Jiangbo Wang & Weihong Li

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Wang, J., Li, T., Zhang, Y. et al. Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting. J. Earth Sci. 31, 867–874 (2020). https://doi.org/10.1007/s12583-020-1335-5

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