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- Title
<sup>40</sup>Ar/<sup>39</sup>Ar 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.
- Authors
LIN, Bin; CHEN, Yuchuan; TANG, Juxing; WANG, Qin; SONG, Yang; YANG, Chao; WANG, Wenlei; HE, Wen; ZHANG, Lejun
- 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.
- Subjects
CHINA; TIBET (China); PORPHYRY; METALLOGENIC provinces; ARGON isotopes; RUBIDIUM-strontium dating; MINERAL industries; GEOLOGICAL time scales
- Publication
Acta Geologica Sinica (English Edition), 2017, Vol 91, Issue 2, p602
- ISSN
1000-9515
- Publication type
Article
- DOI
10.1111/1755-6724.13120