Fission track evidence for the Mesozoic-Cenozoic tectonic uplift of Mt. Bogda, Xinjiang, northwest China

• Published in: Acta geochimica 2006-04, Vol.25 (2), p.143-151
• Main Authors: Shen, Chuanbo, Mei, Lianfu, Peng, Lei, Zhang, Shiwan, Liu, Lin, Tang, Jiguang
• Format: Article
• Language: English
• Subjects: Apatite; Cenozoic; Cooling; Cooling rate; Cretaceous; Fission; Isotopes; Jurassic; Mesozoic; Segments; Tectonics; Temperature; Thermal evolution; Uplift; Zircon
• ISSN: 1000-9426; 2096-0956; 1993-0364; 2365-7499
• DOI: 10.1007/BF02872174

Fission-track dating evidence from 5 apatite samples and 4 zircon samples, and modeled time-temperature thermal history indicate that since Late Jurassic-Cretaceous (150 – 106 Ma), the uplift process of Mt. Bogda can be divided into four stages of thermal evolution: 150 – 106, 75 – 65, 44 – 24 and 13 – 9 Ma. Before 44 – 24 Ma, the cooling rate and uplifting rate of the southern and northern segments of Mt. Bogda are almost the same, showing that the uplifting of Mt. Bogda is an overall process. Since 44 – 24 Ma, the uplifting of the southern and northern segments of Mt. Bogda has shown differences. During 42 – 11 Ma, the northern segment of Mt. Bogda was at a steady stage, with the cooling rate being 0.03°C/Ma and the uplifting rate being 0.001 mm/a. From 11 Ma to the present, the northern segment of Mt. Bogda was at a rapid cooling and uplifting stage, with the cooling rate being 5.72°C/Ma and the uplifting rate being 0.19 mm/a. However, the southern segment of Mt. Bogda has been at a rapid cooling and uplifting stage since 26 Ma, with the cooling rate being 1.24°C/Ma and the uplifting rate being 0.041 mm/a during 26 – 9 Ma; 4.88°C/Ma and 0.163 mm/a from 9 Ma till now.