Apatite fission track thermochronology of Cenozoic igneous rocks from porphyry copper deposits in the Gangdese belt of southern Tibet: Implications for cooling history and ore preservation
作者： Xiang Sun , Xiu-Quan Wan
DOI: 10.1016/J.OREGEOREV.2021.104075
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摘要: Abstract Gangdese of southern Tibet is the largest porphyry copper belt in China. Although ore-forming processes have been extensively concerned, post-mineralization ore preservation state was poorly focused on. Here, we reported apatite fission track (AFT) data for three deposits (Zhunuo, Jiru and Dabu) to reveal cooling exhumation history evaluate preservation. The AFT ages are 13.5 ± 2.2 9.4 ± 1.2 Ma (2σ) Miocene monzogranite granite porphyry, 5.9 ± 1.4 3.5 ± 0.8 Ma Eocene quartz rhyolite, 32.6 ± 8.8 Ma rhyolite at Zhunuo. Combined with thermal modelling results, these elevations samples revealed two rapid episodes at ~10 Ma and ~4 Ma, respectively, Zhunuo deposit. Available from both sides a nearly N-trending fault indicated eastern part would likely uplifted relative western where orebodies occurred. missing portion should be located ca. 600–1200 m above present surface, all or displaced eroded Our new (15.4 ± 3.4 8.4 ± 1.4 Ma; 2σ) Dabu (16.4 ± 2.4 11.9 ± 3.4 Ma; 2σ), together previous low-temperature geochronological data, that may undergone similar during ~15–10 Ma.
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