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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

Citation

Lin, B and Chen, Y and Tang, J and Wang, Q and Song, Y and Yang, C and Wang, W and He, W and Zhang, L, 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, 91, (2) pp. 602-616. ISSN 1000-9515 (2017) [Refereed Article]

Copyright Statement

2017 Geological Society of China

DOI: doi:10.1111/1755-6724.13120

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. 123120 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 121.10.6 Ma (1σ), 120.80.7 Ma (1σ) and 117.91.6 Ma (1σ), respectively. Five hydrothermal mineralization stages were identified, of which the Stage IV pyrite was Rb-Sr dated to be 117.51.8 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.120117Ma.

Item Details

Item Type:Refereed Article
Keywords:40Ar/39Ar and Rb-Sr dating, Tiegelongnan Cu-(Au) deposit, Bangong Co-Nujiang metallogenic belt, Tibet, Proto-Tethys
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Copper Ore Exploration
Author:Lin, B (Mr Bin Lin)
Author:Zhang, L (Mr Lejun Zhang)
ID Code:123694
Year Published:2017
Web of Science® Times Cited:8
Deposited By:CODES ARC
Deposited On:2018-01-19
Last Modified:2018-04-24
Downloads:0

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