Age assignment of the Upper Carboniferous Arbasay Formation in Shichang Region, North Tianshan (NW China)
Jia-Lin Wang1, Chao-Dong Wu1,2,*, Xi Jiang1, Wen Zhu1, Jun Wu1, Jun Wang3, Meng-Lin Zheng4
1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;
2. Institute of Oil & Gas, Peking University, Beijing 100871, China;
3. Department of Xinjiang Exploration Project Management, Sinopec Shengli Oilfield Company, Dongying, Shandong 257000, China;
4 Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
The North Tianshan Orogenic Belt contains the youngest ophiolites in the Tianshan and provides some information on timing of the last closure of the Junggar-Balkhash Ocean. LA-ICP-MS zircon U-Pb dating was conducted to define the formation age of the Arbasay Formation in the Shichang Region of North Tianshan, which is exposed near the suture zone but its age remains debated. The Arbasay Formation is mainly composed of volcanic and volcaniclastic rocks with tuff interlayers. The zircons from the tuffs yield two age populations of 315 ± 3 Ma and 304 ± 2 Ma, constraining the commencement and demise timings of volcanism, respectively. Furthermore, zircon U-Pb age spectra of the tuffaceous sandstones display the youngest peak age at 308 Ma, indicating a < 308 Ma age for the depositional age of volcaniclastic rocks. The volcaniclastic rocks therefore were likely to deposit together with the syn-sedimentary volcanism during Late Carboniferous. This means that the Arbasay Formation in Shichang Region should be re-assigned to Late Carboniferous in age. Given that the Arbasay Formation was likely to be formed during the tectonic transition from compression to extension, the Junggar-Balkhash Ocean possibly closed during Late Carboniferous.
. Age assignment of the Upper Carboniferous Arbasay Formation in Shichang Region, North Tianshan (NW China)[J]. Journal of Palaeogeography, 2018, 7(3): 3-3.
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2018, Vol. 7 
