Earth Science Frontiers ›› 2014, Vol. 21 ›› Issue (6): 372-380.DOI: 10.13745/j.esf.2014.06.035

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The constraints of the fission track thermochronology on active time of the Southern Tibetan Detachment System in Cho Oyu, Tibet.

  

  • Received:2013-09-17 Revised:2014-05-12 Online:2014-11-15 Published:2014-11-15

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Abstract:

This research uses fission track experiments to study the geological activity of the South Tibetan Detachment System (STDS) based on 5 zircon samples and 4 apatite samples from the Cho Oyu in the Tibetan Himalayan. The age range of the zircons is 11.217.1 Ma and that of the apatites is 12.414.3 Ma. After integrating the ageclosure temperatures measured for these samples, we found that the crustal cooling rate of the Lhotse detachment fault along the Cho Oyu increased gradually during the Miocene：(1) during 17.115.2 Ma the crustal cooling rate was approximately 37.8 ℃/Ma; (2) during 15.213.5 Ma the average crustal cooling rate was ~82.4 ℃/Ma, and the tectonic activity was most intense at ~14.3 Ma; (3) during 13.512.4 Ma the crust cooling rate during that time was up to 100 ℃/Ma.

 

Key words:  leucogranites, fission track thermochronology, Southern Tibetan Detachment System, Cho Oyu, QinghaiTibet Plateau

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