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Petrogenesis and Geological Significance of the Taihua Group TTG Gneisses in the Xiong'ershan Area, Southern Margin of the North China Craton
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Wenting YAN1, Li TANG1, *, Qianmu YANG2, Liang WANG3, Longlong CHEN1
Northwestern Geology | 2026, 59(3) : 314 - 327
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Northwestern Geology | 2026, 59(3): 314-327
Petrogenesis and Geological Significance of the Taihua Group TTG Gneisses in the Xiong'ershan Area, Southern Margin of the North China Craton
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Wenting YAN1, Li TANG1, *, Qianmu YANG2, Liang WANG3, Longlong CHEN1
Affiliations
  • 1School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • 2School of Energy Institute, China University of Geosciences (Beijing), Beijing 100083, China
  • 3Technology Innovation Center for Gold Ore Exploration, Xi’an Mineral Resources Survey of China Geological Survey, Xi’an 710100, Shaanxi, China
Published: 2026-06-20 doi: 10.12401/j.nwg.2025164
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The North China Craton underwent a prolonged and complex geological evolution during the Archean to Paleoproterozoic, with the magmatic and metamorphic processes remain as the research questions. This study focuses on the TTG (tonalite-trondhjemite-granodiorite) gneisses of the Taihua Group in the Xiong’ershan area along the southern margin of the North China Craton. The integrated field investigations, petrographic analysis under the microscope, geochemistry, zircon U-Pb dating and Hf isotopic studies are conducted to elucidate the Paleoproterozoic magmatic mechanisms and the tectonic evolution of this region. Zircon U-Pb dating constrains the magmatic crystallization age of the Taihua Group TTG gneisses in the Xiong’ershan area to approximately 2300 Ma, while the metamorphic ages range from 1984 Ma to 1940 Ma. The Taihua Group TTG gneisses exhibit a wide compositional range, with SiO2 (59.35%～70.78%), Al2O3 (12.41%～17.93%), and relatively high CaO (1.40%～5.52%) and MgO (0.95%～2.56%) contents. It is enriched in light rare earth elements (LREE) and depleted in heavy rare earth elements (HREE), displaying strong fractionation between LREE and HREE. In composition, it resembles high-Al TTG gneisses. The samples are enriched in large-ion lithophile elements (LILEs) such as Rb, Ba, and Sr, but depleted in high-field-strength elements (HFSEs) like Nb, Ta, and Ti, which are similar to the features of island arc granites. Additionally, magmatic zircons display relatively high (176Hf/177Hf)ᵢ ratios (0.281282～0.281332), εHf(t) values (−2.98 ～ +0.20), and two-stage model ages (2844～2994 Ma), indicating that the magmatic source originated from the partial melting of Mesoarchean ancient crust. These findings suggest that the TTG gneisses in the Xiong’ershan area formed during the Paleoproterozoic subduction process between the eastern and western blocks of the North China Craton. The metamorphic age of 1984～1940 Ma records the collisional process along the Trans-North China Orogeny. This further constrains the timing of collision between the eastern and western continental blocks.

Xiong'ershan area  /  TTG gneiss  /  Taihua Group  /  petrogenesis  /  North China Craton
严文婷, 唐利, 杨谦牧, 王亮, 陈龙龙. 华北克拉通南缘熊耳山地区太华群TTG片麻岩成因及地质意义. 西北地质, 2026 , 59 (3) : 314 -327 . DOI: 10.12401/j.nwg.2025164
Wenting YAN, Li TANG, Qianmu YANG, Liang WANG, Longlong CHEN. Petrogenesis and Geological Significance of the Taihua Group TTG Gneisses in the Xiong'ershan Area, Southern Margin of the North China Craton[J]. Northwestern Geology, 2026 , 59 (3) : 314 -327 . DOI: 10.12401/j.nwg.2025164
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Year 2026 volume 59 Issue 3
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Article Info
doi: 10.12401/j.nwg.2025164
  • Receive Date：2025-12-05
  • Online Date：2026-09-16
  • Published：2026-06-20
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  • Received：2025-12-05
  • Revised：2026-01-23
  • Accepted：2026-01-29
Affiliations
    1School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    2School of Energy Institute, China University of Geosciences (Beijing), Beijing 100083, China
    3Technology Innovation Center for Gold Ore Exploration, Xi’an Mineral Resources Survey of China Geological Survey, Xi’an 710100, 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
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Genus		 种数
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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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