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JING Yongkang，ZHANG Long，LIU Ming，et al. Zircon U-Pb Dating, Trace Elements Characteristics and Geological Significance of Tonalite in the Huashigou Area, Northwestern Margin of Qaidam Basin[J]. Northwestern Geology，2025，XX（XX）：1−14. doi: 10.12401/j.nwg.2024097
Citation: JING Yongkang，ZHANG Long，LIU Ming，et al. Zircon U-Pb Dating, Trace Elements Characteristics and Geological Significance of Tonalite in the Huashigou Area, Northwestern Margin of Qaidam Basin[J]. Northwestern Geology，2025，XX（XX）：1−14. doi: 10.12401/j.nwg.2024097
shu

Zircon U-Pb Dating, Trace Elements Characteristics and Geological Significance of Tonalite in the Huashigou Area, Northwestern Margin of Qaidam Basin

  • 1.

    Technology Innovation Center for Gold Mine Exploration, China Geological Survey, Xi’an 710100, Shaanxi, China

  • 2.

    Xi’an Center of Mineral Resources Survey, China Geological Survey, Xi’an 710100, Shaanxi, China

  • 3.

    School of Earth Science and Resources, Chang’an University, Xi’an, 710054, Shaanxi, China

  • 4.

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

More Information
  • Received Date: June 12, 2023
  • Revised Date: November 05, 2024
  • Accepted Date: November 05, 2024
  • Available Online: November 11, 2024
    Graphical Abstract
    • Abstract

  • This study focuses on the tonalite in the Huashigou in the western section of the Quanji massif, northwestern margin of the Qaidam basin. Based on detailed field investigations, LA-ICP-MS in-situ isotopic dating and elemental analyses were carried out on the primary zircons to explore the evolutionary history of this area during the important tectonic transition period of the Devonian. The CL images of zircons in Huashigou tonalite show that zircon crystals are mostly columnar or irregularly shaped, euhedral to subhedral grains with clear oscillatory zonations. Zircon U-Pb dating yields a weighted average age of 371.1±3.5 Ma, a concordant age of 370.9±1 Ma, and a Th/U ratio of 0.42～0.83. LA-ICP-MS in-situ elemental analysis shows obvious Ce positive anomalies, strong Eu negative anomalies, and relative enrichment in light rare earth elements (LREE) compared to heavy rare earth elements (HREE). Zircon Ti thermometer calculation reveals zircon crystallization temperatures (tZr-Ti) ranging from 628 to 722 ℃, indicating a typical magmatic origin. In the Pb-Th diagram, all zircon spots fall within the I-type granite zircon field, representing that the original magma is crust-mantle mixed. Based on the above information, it is inferred that Huashigou tonalite was formed in an extensional environment after the collision, representing a magmatic event caused by mantle upwelling and crustal reworking.

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