Abstract
The newly discovered Tiegelongnan Cu (Au) deposit is a giant porphyry deposit overprinted by a high-sulfidation epithermal deposit in the western part of the Bangong–Nujiang metallogenic belt, Duolong district, central Tibet. It is mainly controlled by the tectonic movement of the Bangong–Nujiang Oceanic Plate (post-subduction extension). After the closure of the Bangong–Nujiang Ocean, porphyry intrusions emplaced at around 121 Ma in the Tiegelongnan area, which might be the result of continental crust thickening and the collision of Qiangtang and Lhasa terranes, based on the crustal radiogenic isotopic signature. Epithermal overprinting on porphyry alteration and mineralization is characterized by veins and fracture filling, and replacement textures between two episodes of alteration and sulfide minerals. Alunite and kaolinite replaced sericite, accompanied with covellite, digenite, enargite, and tennantite replacing chalcopyrite and bornite. This may result from extension after the Qiangtang–Lhasa collision from 116 to 112 Ma, according to the reopened quartz veins filled with later epithermal alteration minerals and sulfides. The Tiegelongnan deposit was preserved by the volcanism at ~110 Ma with volcanic rocks covering on the top before the orebody being fully weathered and eroded. The Tiegelongnan deposit was then probably partly dislocated to further west and deeper level by later structures. The widespread post-mineral volcanic rocks may conceal and preserve some unexposed deposits in this area. Thus, there is a great potential to explore porphyry and epithermal deposit in the Duolong district, and also in the entire Bangong–Nujiang metallogenic belt.
Highlights
In the past two decades, some large porphyry deposits have been found in Tibet, China, such as Yulong deposit (6.22 Mt at 0.99% Cu) [1], Qulong deposit (7.1 Mt at 0.5% Cu) [2], Jiama deposit (7.4 Mt at 0.5% Cu) [3], Duobuza deposit (2.9 Mt at 0.46% Cu) [4], and Bolong deposit (3.8 Mt at0.5% Cu) [5]
The Duolong porphyry Cu-Au district is located in the Bangong–Nujiang metallogenic belt (BNMB), central Tibetan Plateau, which was discovered in 2007 and hosts several large porphyry and epithermal deposits and ore prospects (Figure 1)
The Tiegelongnan deposit is the first high-sulfidation epithermal deposit being discovered in the Tibetan Plateau
Summary
In the past two decades, some large porphyry deposits have been found in Tibet, China, such as Yulong deposit (6.22 Mt at 0.99% Cu) [1], Qulong deposit (7.1 Mt at 0.5% Cu) [2], Jiama deposit (7.4 Mt at 0.5% Cu) [3], Duobuza deposit (2.9 Mt at 0.46% Cu) [4], and Bolong deposit The Duolong porphyry Cu-Au district is located in the Bangong–Nujiang metallogenic belt (BNMB), central Tibetan Plateau, which was discovered in 2007 and hosts several large porphyry and epithermal deposits and ore prospects (Figure 1). The Tiegelongnan deposit was discovered in 2013, containing the largest scale Cu resource within this district, and it was documented as a porphyry Cu (Au) deposit overprinted by high-sulfidation mineralization [7]. The Tiegelongnan deposit is the first high-sulfidation epithermal deposit being discovered in the Tibetan Plateau. The Tiegelongnan deposit is an example to study the tectonic control, reconstruction and preservation process of porphyry Cu systems in the Tibetan.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
