期刊
ACTA GEOLOGICA SINICA-ENGLISH EDITION
卷 91, 期 2, 页码 602-616出版社
WILEY
DOI: 10.1111/1755-6724.13120
关键词
40Ar; 39Ar and Rb-Sr dating; Tiegelongnan Cu-(Au) deposit; Bangong Co-Nujiang metallogenic belt; Tibet; Proto-Tethys
资金
- Public Science and Technology Research Funds Projects, Ministry of Land Resources of the People's Republic of China [201511017, 201511022-02]
- Basic Research Fund of the Chinese Academy of Geological Sciences [YYWF201608]
- National Natural Science Foundation of China [41402178]
- Geological Survey Project of the China Geological Survey [1212011405040]
- Golden Dragon Mining Co. Ltd. [XZJL-2013-JS03]
- China Scholarship Council
The Tiegelongnan deposit is a newly discovered super-large porphyry-epithermal Cu-(Au) deposit in the western part of the Bangong Co-Nujiang metallogenic belt, Tibet (China). Field geology and geochronology indicate that the porphyry mineralization was closely related to the Early Cretaceous intermediate-felsic intrusions (ca. 123-120 Ma). Various epithermal ore and gangue mineral types were discovered in the middle-shallow part of the orebody, indicating the presence of epithermal mineralization at Tiegelongnan. Potassic, propylitic, phyllic and advanced argillic alteration zones were identified. 40Ar/39Ar dating of hydrothermal biotite (potassic zone), sericite (phyllic zone), and alunite (advanced argillic zone) in/around the ore-bearing granodiorite porphyry yielded 121.1 +/- 0.6 Ma (1 sigma), 120.8 +/- 0.7 Ma (1 sigma) and 117.9 +/- 1.6 Ma (1 sigma), respectively. Five hydrothermal mineralization stages were identified, of which the Stage IV pyrite was Rb-Sr dated to be 117.5 +/- 1.8 Ma (2 sigma), representing the end of epithermal mineralization. Field geology and geochronology suggest that both the epithermal and porphyry mineralization belong to the same magmatic-hydrothermal system. The Tiegelongnan super-large Cu-(Au) deposit may have undergone a prolonged magmatic-hydrothermal evolution, with the major mineralization event occurring at ca.120-117Ma.
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