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40Ar/39Ar and Rb-Sr ages of the Tiegelongnan Porphyry Cu-(Au) deposit in the Bangong Co-Nujiang Metallogenic Belt of Tibet, China: implication for generation of super-large deposit

Lin, B, Chen, Y, Tang, J, Wang, Qin, Song, Y, Yang, C, Wang, Wenlei, He, W and Zhang, L 2017 , '40Ar/39Ar and Rb-Sr ages of the Tiegelongnan Porphyry Cu-(Au) deposit in the Bangong Co-Nujiang Metallogenic Belt of Tibet, China: implication for generation of super-large deposit' , Acta Geologica Sinica, vol. 91, no. 2 , pp. 602-616 , doi: 10.1111/1755-6724.13120.

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Abstract

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 (1σ), 120.8±0.7 Ma (1σ) and 117.9±1.6 Ma (1σ), respectively. Five hydrothermal mineralization stages were identified, of which the Stage IV pyrite was Rb-Sr dated to be 117.5±1.8 Ma (2σ), 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.

Item Type: Article
Authors/Creators:Lin, B and Chen, Y and Tang, J and Wang, Qin and Song, Y and Yang, C and Wang, Wenlei and He, W and Zhang, L
Keywords: 40Ar/39Ar and Rb-Sr dating, Tiegelongnan Cu-(Au) deposit, Bangong Co-Nujiang metallogenic belt, Tibet, Proto-Tethys
Journal or Publication Title: Acta Geologica Sinica
Publisher: Geological Soc China
ISSN: 1000-9515
DOI / ID Number: 10.1111/1755-6724.13120
Copyright Information:

© 2017 Geological Society of China

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