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Zircon U-Pb Dating, Trace Elements Characteristics and Geological Significance of Tonalite in the Huashigou Area, Northwestern Margin of Qaidam Basin
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Yongkang JING1, 2, Long ZHANG1, 2, 3, *, Ming LIU1, 2, Yuanwei WANG1, 2, Kang CHEN1, 2, 4, Nan DENG1, 2, Yi ZHANG1, 2, 3, Junwei WU1, 2
Northwestern Geology | 2026, 59(4) : 285 - 298
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Northwestern Geology | 2026, 59(4): 285-298
Zircon U-Pb Dating, Trace Elements Characteristics and Geological Significance of Tonalite in the Huashigou Area, Northwestern Margin of Qaidam Basin
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Yongkang JING1, 2, Long ZHANG1, 2, 3, *, Ming LIU1, 2, Yuanwei WANG1, 2, Kang CHEN1, 2, 4, Nan DENG1, 2, Yi ZHANG1, 2, 3, Junwei WU1, 2
Affiliations
  • 1Technology Innovation Center for Gold Mine Exploration, China Geological Survey, Xi’an 710100, Shaanxi, China
  • 2Xi’an Center of Mineral Resources Survey, China Geological Survey, Xi’an 710100, Shaanxi, China
  • 3School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China
  • 4State Key Laboratory of Continental Evolution and Early Life, Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China
Published: 2026-08-20 doi: 10.12401/j.nwg.2024097
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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.

tonalite  /  zircon  /  zircon U-Pb isotope dating  /  northwestern margin of Qaidam basin
景永康, 张龙, 刘明, 王元伟, 陈康, 邓楠, 张毅, 吴珺玮. 柴北缘西段化石沟英云闪长岩锆石U-Pb测年、微量元素特征及其地质意义. 西北地质, 2026 , 59 (4) : 285 -298 . DOI: 10.12401/j.nwg.2024097
Yongkang JING, Long ZHANG, Ming LIU, Yuanwei WANG, Kang CHEN, Nan DENG, Yi ZHANG, Junwei WU. Zircon U-Pb Dating, Trace Elements Characteristics and Geological Significance of Tonalite in the Huashigou Area, Northwestern Margin of Qaidam Basin[J]. Northwestern Geology, 2026 , 59 (4) : 285 -298 . DOI: 10.12401/j.nwg.2024097
Appendix
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Year 2026 volume 59 Issue 4
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Article Info
doi: 10.12401/j.nwg.2024097
  • Receive Date：2023-06-13
  • Online Date：2026-09-16
  • Published：2026-08-20
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History
  • Received：2023-06-13
  • Revised：2024-11-06
  • Accepted：2024-11-06
Affiliations
    1Technology Innovation Center for Gold Mine Exploration, China Geological Survey, Xi’an 710100, Shaanxi, China
    2Xi’an Center of Mineral Resources Survey, China Geological Survey, Xi’an 710100, Shaanxi, China
    3School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China
    4State Key Laboratory of Continental Evolution and Early Life, Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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