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Mineralogy and Petrology

, Volume 109, Issue 5, pp 577–596 | Cite as

On the origin of mafic magmatic enclaves (MMEs) in syn-collisional granitoids: evidence from the Baojishan pluton in the North Qilian Orogen, China

  • Shuo ChenEmail author
  • Yaoling NiuEmail author
  • Wenli Sun
  • Yu Zhang
  • Jiyong Li
  • Pengyuan Guo
  • Pu Sun
Original Paper

Abstract

Mafic magmatic enclaves (MMEs) are abundant in Baojishan syn-collisional granitoids located in the eastern section of the North Qilian Orogen. Zircon U-Pb ages of the host granodiorite (433.7 ± 3.4 Ma) and their MMEs (431.6 ± 2.8 Ma) are the same as the time of the Qilian ocean closing and continental collision at ∼440–420 Ma, indicating that the granitoids represent a magmatic response to the collision between the Qilian-Qaidam block and the Alashan block. The MMEs have the same mineralogy as the host granodiorite except that they are more abundant in mafic phases (e.g., amphibole and biotite) and thus have higher heavy rare earth element (HREE) abundances. Both the host granodiorite and the MMEs have light REE-enriched patterns and relatively flat HREE patterns (i.e., [Dy/Yb]N = 1–1.1). They are enriched in large ion lithophile elements (LILEs; e.g., Rb, K, Pb) and depleted in high field strength elements (HFSEs; e.g., Nb, Ta, Ti) and show a varying Sr anomaly (i.e., Sr/Sr* = 0.9–2.2) for the host and a negative Sr anomaly (i.e., Sr/Sr* = 0.4–0.6) for the MMEs. Both the host granodiorite and the MMEs have overlapping and indistinguishable Sr-Nd-Hf isotopic compositions (87Sr/86Sr(i) = 0.7067–0.7082, εNd(t) = −3.9–−3.2, εHf(t) = 1.0–14.7). The extremely high εHf(t) = 14.7 of sample BJS12-06MME likely results from the calculation due to nugget effect of zircons because of the unexpectedly high Hf (3.53 ppm) and too high Zr (128 ppm). All these characteristics are fully consistent with the MMEs being of cumulate origin formed at earlier stages of the same magmatic systems rather than representing mantle melt required by the popular and alleged magma mixing model. The radiogenic Sr and unradiogenic Nd (εNd(t) <0) indicate the contribution of mature continental crust, while variably radiogenic Hf (εHf(t) > 0) for both the MMEs and their host granodiorite manifest the significant mantle input. The apparent decoupling between Nd and Hf isotopes are likely caused by partial melting of recycled terrigenous sediments and the remaining part of the North Qilian ocean crust under the amphibolite facies conditions during the collision.

Keywords

Continental Collision Heavy Rare Earth Element Adakitic Rock Host Granodiorite Granitoid Host 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (NSFC: 91014003, 41130314) and two geological survey projects of China Geological Survey Departments and Offices (1212011121092, 1212011220928). We appreciate two anonymous reviewers for constructive comments and Editor Johann G. Raith and Yigang Xu for handling the manuscript. We thank Yongsheng Liu and Zhaochu Hu for assistance with zircon analysis, Li Su with whole rock major and trace elements analysis, Minwu Liu with electron microprobe analysis, and Jianxin Zhao and Yuexing Feng with hole-rock Sr-Nd-Hf isotope analysis.

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Authors and Affiliations

  1. 1.Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Department of Earth SciencesDurham UniversityDurhamUK
  4. 4.School of Earth SciencesLanzhou UniversityLanzhouChina

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