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

Yinjuan Ju; Xiaoli Zhang; Shaocong Lai; Jiangfeng Qin

doi:10.1007/s12583-017-0745-5

Volume 28 Issue 1

Feb 2017

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Journal of Earth Science > 2017 > 28(1): 51-62.

Yinjuan Ju, Xiaoli Zhang, Shaocong Lai, Jiangfeng Qin. 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. Journal of Earth Science, 2017, 28(1): 51-62. doi: 10.1007/s12583-017-0745-5

Citation:

Yinjuan Ju, Xiaoli Zhang, Shaocong Lai, Jiangfeng Qin. 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. Journal of Earth Science, 2017, 28(1): 51-62. doi: 10.1007/s12583-017-0745-5

Citation:

Yinjuan Ju, Xiaoli Zhang, Shaocong Lai, Jiangfeng Qin. 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. Journal of Earth Science, 2017, 28(1): 51-62. doi: 10.1007/s12583-017-0745-5

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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

doi: 10.1007/s12583-017-0745-5

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

More Information

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

Jiangfeng Qin: http://orcid-org/orcid.org/0000-0002-7186-4821
Corresponding author: Jiangfeng Qin, qinjf@nwu.edu.cn
Received Date: 21 Aug 2015
Accepted Date: 23 Jun 2016
Publish Date: 01 Feb 2017

Abstract

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 FeO^T/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 10000×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.
- highly-fractionated I-type granites,
- Permain-Triassic,
- Qaidam Basin,
- eastern Kunlun orogenic belt,
- Paleo-Tethys

Supplementary materials (Tables S1–S2) are available in the online version of this article at http://dx.doi.org/10.1007/s12583-017-0745-5.

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