Apatite Fission Track Thermochronology and Tectonic Significance in Yemaquan Area,East Kunlun
Zhu Chuanbao
Sun Feifei
Yuan Wanming
Zhang Aikui
Zhang Daming
Ma Zhongyuan
Zhou Qinglu
Wang Shengming
Zhao Mengqi
Liu Guanglian
Abstract：We present the tectonic evolution characteristics of Yemaquan area,which is located in west of the East Kunlun Mountains,according to apatite fission track thermochronology analysis.The results show that apatite fission track ages mainly are divided into three groups,including 153.8 Ma,106.8 to 81.0 Ma,and 48.7 to 44.4 Ma,respectively.The Bangonghu-Nujiang ocean closure event happened in 153.8 Ma,then the collision and combination of Lhasa block and Qiangtang block on the East Kunlun area mainly ranged from 106.8 to 81.0 Ma,and post-orogenic stretching events after the collision between the India-Eurasia occurred during 48.7 Ma and 44.4 Ma.In addition,the analysis results also indicate that three stages of thermal history of Yemaquan area are mainly ranged from 130 to 110 Ma,110 to 14 Ma,and 14 Ma to now,respectively.The first stage,130—110 Ma,corresponds to collision activity between the Lhasa and the Qiangtang block after the closed up of the Bangonghu-Nujiang oceanic basin.The second stage,110—14 Ma,rised continuously,with strike-slip movement of Alkin fault and the ductile deformation of the Xidatan fault occurred during 110—90 Ma.And the last stage,14 Ma to now,uplifted rapid- ly,and affected by strong tectonic activity of Tibetan plateau since Neogene.Uplift rates and uplift ranges for these three stages are estimated of 0.021 mm/a and 0.42 km,0.01 mm/a and 1.0 km,and 0.1 mm/a and 1.43 km,respectively,with the average uplift rate and the total uplift height of 0.028 mm/a,and 2.86 km,respectively.
Keywords：fission tracktectonicsthermal history simulationupliftingapatiteEast Kunlun
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 2019-2028 )