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Timing of Lithospheric Extension in Northeastern China: Evidence from the Late Mesozoic Nianzishan A-Type Granitoid Complex

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Abstract

New zircon U-Pb dates obtained by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), whole-rock geochemical data and Sm-Nd and Rb-Sr isotopic data are presented for miarolitic alkaline granites, porphyritic syenite and rhyolites of the Nianzishan A-type granitoid complex (NAGC) in the Great Xing’an Range-Songliao Basin in Northeast (NE) China. New crystallization ages of 112.95±0.93 and 114.1±1.71 Ma for granite and 118.6±0.51 Ma for porphyritic syenite were determined by high-precision LA-ICP-MS. The εNd(t) of the rocks range from +1.85 to +2.06, with Nd model ages (TDM1) from 671 to 821 Ma, indicating that the NAGC originated from juvenile source rocks and exhibits geochemical characteristics of A1- and AA-type granite which formed in an extensional setting. We attribute the magmatism to regional extension and lithospheric thinning caused by the subduction of the western Pacific Plate about 120 to 100 Ma.

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Acknowledgments

This Study was funded by the China Geological Survey (Nos. DD20160123 (DD-16-049, D1522), DD20160346, 1212011121075, 212010911028, 12120114020901) and the National Natural Science Foundation of China (No. NSFC40802020). The authors are grateful to Yu Zhang of the Geological Survey of Heilongjiang Province for their help in the field. For the zircon analyses, the authors thank Kejun Hou and Qian Wang at the Institute of Mineral Resources of the Chinese Academy of Geological Sciences. The authors sincerely thank J. B. Whalen, Suhua Cheng, and Yang Wang for their guidance. Thanks go to two reviewers for their valuable comments and suggestions. The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0996-9.

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Correspondence to Cui Liu.

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Qin, J., Liu, C., Chen, Y. et al. Timing of Lithospheric Extension in Northeastern China: Evidence from the Late Mesozoic Nianzishan A-Type Granitoid Complex. J. Earth Sci. 30, 689–706 (2019). https://doi.org/10.1007/s12583-018-0996-9

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  • DOI: https://doi.org/10.1007/s12583-018-0996-9

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