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LU Peng, TONG Ying, MENG Qiuyi, ZHANG Huafeng. Petrogenesis and tectonic setting of the Late Permian A-type granitic dyke swarm in Ulungur, East Junggar[J]. Geological Bulletin of China, 2021, 40(1): 58-70.
Citation: LU Peng, TONG Ying, MENG Qiuyi, ZHANG Huafeng. Petrogenesis and tectonic setting of the Late Permian A-type granitic dyke swarm in Ulungur, East Junggar[J]. Geological Bulletin of China, 2021, 40(1): 58-70.
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Petrogenesis and tectonic setting of the Late Permian A-type granitic dyke swarm in Ulungur, East Junggar

  • 1.

    Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

  • 2.

    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

  • 3.

    Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information
Received Date:  10 September 2020
Revised Date:  10 November 2020
Publish Date:  15 January 2021
    Abstract

  • A large number of Late Paleozoic granites occur in the East Junggar on the southwest margin of the Central Asian Orogenic belt, providing a good chance to reveal the crustal evolution of the Central Asian Orogenic Belt. In this study, a series of Late Paleozoic granitic dykes striking vertically to the suture zone were recognized in Akejila, northwest of Ulungur of East Junggar. Their timing of emplacement and petrogenesis are critical to understand the tectono-crustal evolution of the study area. SHRIMP zircon U-Pb dating yielded a Late Permian age (266±2 Ma). Geochemical analyses indicate that they are characterized by relatively high concentration of silica (SiO2=75.66%~76.69%) and alkali (Na2O+K2O=8.67%~9.16%), but low calcium (CaO =0.06%~0.14%) and magnesia (MgO =0.04%~0.06%)content. The obvious negative Eu anomaly (δEu=0.16~0.18), relative depletion of Ba, Sr, P and Ti, and significant enrichment of Nb, Zr, Th, Ta and Hf, as well as high Ga/Al value (>2.6) characterize the weakly peraluminous A1 type granites. The positive εNd(t) value (+4.7) and a young model age (655 Ma) suggest that these dykes are mainly derived from the juvenile mantle. Therefore, the comprehensive analysis indicates that the dykes were formed by the partial melting of the juvenile lower crust caused by the upwelling of the mantle in a post-collision setting.

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