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Extensional magmatism caused by strain partitioning: insights from the mafic dikes hosted in Biesituobie batholith in West Junggar, CAOB

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Abstract

The connection between magmatism and the tectonic environment is essential yet highly debatable. The West Junggar, CAOB, outcropped a swarm of norite-gabbro dikes hosted in the Biesituobie batholith. The dikes are a family of mafic magma consisting of nortite, norite-gabbro, and gabbro with equigranular, porphyritic, and cumulate textures. The mafic dikes represent various chemical compositions due to the magma evolution suggested by the different lithological textures, especially for MgO, CaO, Sr, and Eu, possibly caused by the crystal fractionation. But commonly, they show depleted Nb, Ta, Zr, Hf, Ti, and enriched Ba, U. Geochronology study by LA-ICP-MS gives zircon U–Pb age of 265 ± 4 Ma, 269 ± 1 Ma, 270 ± 2 Ma for the mafic dikes, respectively. The mafic dikes show geochemical similarities with E-MORB type lava with minor subduction affinity. The low fraction on the LREE/HREE indicates that they were generated from a relatively shallow mantle with low pressure. The norite-gabbro dikes and the host batholith suggest a regional extension with crust thining upwelling of the mantle caused by strain partitioning. Regionally, the Permian extensional magmatism is distributed mainly in the “Yumin–Miaoergou axis, ” perpendicular to the Darburt fault. The activation of the Darburt fault might cause the partition of regional transpression strain into simple shear along the strike-slip Darburt fault and pure shear perpendicular to the fault. The T-fracture parallel with the maximum principal stress of the pure shear causes crustal thinning and mantle upwelling, generating the extensional magmatism in the “Yumin–Miaoergou axis.” This tectonic scenario might be the essential geodynamic background for extensional magmatism, which suggest that local extension might be coordinated with regional transpression, and a unified regional extension is not needed in such a model.

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Acknowledgements

We thank Chunjing Wei, Shuguang Song, and Liudong Ren for discussions on the earlier version of this manuscript and suggestions from the two anonymous reviewers which improved the manuscript. We sincerely thank Yonghong Shi and Juan Wang, Hefei University of Technology, for their assistance in electronic microprobe analyses. We also thank Jianxin Zhao, Faye Liu, Xueyin Feng, and Ai Nguyen, Univerisity of Queensland, Australia, for their help in the LA-ICP-MS U-Pb dating of zircon. Special thanks are expressed to the editors and reviewers for their critical comments that substantially improved the manuscript. This study was financially supported by the National Natural Science Foundation of China (41902231, 42172247, 41888101, 41730215), the Key Research Program of Frontier Sciences, CAS (QYZDJ-SSW-DQC036), the Fundamental Research Funds for the Central Universities (E1E40416X2), and the China Postdoctoral Council (2018M631556).

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We confirm here formally that this manuscript is the authors' original work, and it has not been published previously in English or any other language online or in print. All the authors have been involved with the work and have approved the manuscript and agree to its submission. The paper will not be submitted anywhere else while it is under consideration by International Journal of Earth Sciences. All the authors of this manuscript agree to its submission to International Journal of Earth Sciences.

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YC: conceptualization, investigation, data curation, writing—original draft, visualization, project administration, funding acquisition. JL: investigation, data curation. RZ: data curation, writing—review and editing. WX: writing—review and editing, supervision, project administration, funding acquisition. JZ: investigation, writing—review and editing. ZZ: investigation, data curation. QWLZ: investigation. ZMGL: investigation. CW: conceptualization, investigation, writing—review and editing, supervision, project administration, funding acquisition.

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Correspondence to Yichao Chen.

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We declare that we have no financial and personal relationships with other people or organizations that can in appropriately our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled “Extensional magmatism caused by strain partitioning: insights from the mafic dikes hosted in Biesituobie Batholith in West Junggar, CAOB”.

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Chen, Y., Liu, J., Zhou, R. et al. Extensional magmatism caused by strain partitioning: insights from the mafic dikes hosted in Biesituobie batholith in West Junggar, CAOB. Int J Earth Sci (Geol Rundsch) 112, 33–49 (2023). https://doi.org/10.1007/s00531-022-02234-w

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