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Permian–Triassic highly-fractionated I-type granites from the southwestern Qaidam Basin (NW China): Implications for the evolution of the paleo-tethys in the eastern Kunlun orogenic belt

  • Petrogeochemistry and Mineral Deposit Geochemistry
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Abstract

Late Paleozoic to Early Mesozoic granites are widespread in the southern Qaidam Basin, northern margin of the eastern Kunlun orogenic belt. Their petrogenesis can provide us insights into the tectonic evolution and crustal growth process in the Qaidam Basin. This paper reports Permian–Triassic granites from the Kunbei area, southwestern Qaidam Basin. Detailed zircon LA-ICP MS U-Pb dating reveals that the granites from the four drilling cores (q404, q406, q1612-8, q1613-8) have identical ages of 251±3, 256±4, 247±2, and 251±6 Ma, respectively, these ages are identical with the Permian–Triassic granites from the eastern Qaidam Basin. Detailed geochemical analyses indicate that these granites display typical affinities of highly-fractionated I-type granites: (1) they have high SiO2 (up to 76.5 wt.%), Na2O+K2O (7.91 wt.% to 9.48 wt.%) contents and high FeOT/MgO values of 4.7 to 9.3, suggesting significant fractional crystallization; (2) their low A/CNK values of 0.54 to 1.03, no normative Al-rich minerals, inconsistent with the per-aluminous S-type granites; (3) their low Ga (14.5 ppm to 20.7 ppm) and 10 000×Ga/Al (2.23 to 3.03, most of them <2.6) values are inconsistent with the A-type granites; (4) the high Rb (191 ppm to 406 ppm) contents and Rb/Sr (2.1 to 13.4) ratios, as well as the significant negative Eu anomalies (0.10 to 0.42) also indicate significant fractional crystallization of feldspars; (5) their low P2O5 contents (0.02 wt.% to 0.10 wt.%) suggest the limited solubility of phosphorus in primitive metaluminous melts. In combination with the geological background, we propose that the Permian–Triassic highly-fractionated I-type granites resulted from partial melting of intra-crustal mafic rocks, and the primitive I-type granitic melts underwent significant fractional crystallization of feldspars. The occurrence of highly-fractionated I-type granites in the southwestern Qaidam Basin suggests a Permian–Triassic active continental margin in the northern margin of the East Kunlun orogenic belt.

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Acknowledgments

Financial support for this study was jointly provided by the National Natural Science Foundation of China (No. 41102037), the foundation for the author of National Excellent Doctoral Dissertation of China (No. 201324), the Foundation of Young Excellent Scientists of the Shaanxi Province (No. 2014KJXX-60) and the MOST Special Fund from the State Key Laboratory of Continental Dynamics. Two anonymous reviewers gave kind and important suggestions. The final publication is available at Springer via http://dx.doi.org/10.1007/s12583-017-0745-5.

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

    Yinjuan Ju, Xiaoli Zhang, Shaocong Lai & Jiangfeng Qin

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  1. Yinjuan Ju
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  2. Xiaoli Zhang
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Correspondence to Jiangfeng Qin.

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Yinjuan Ju: http://orcid-org/0000-0002-8225-4922

Jiangfeng Qin: http://orcid-org/orcid.org/0000-0002-7186-4821

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Ju, Y., Zhang, X., Lai, S. et al. Permian–Triassic highly-fractionated I-type granites from the southwestern Qaidam Basin (NW China): Implications for the evolution of the paleo-tethys in the eastern Kunlun orogenic belt. J. Earth Sci. 28, 51–62 (2017). https://doi.org/10.1007/s12583-017-0745-5

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