Provenance analysis of Nanyinger Group in the North Qilian Belt: constraints from zircon U–Pb geochronology

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• 作者：Yu Zhang ; Duoyun Wang ; Hua Yang ; Bushe Xin ; Jinhua Fu…
• 关键词：Detrital zircon ; North Qilian ; Nanyinger Group ; Triassic ; Provenance
• 刊名：Arabian Journal of Geosciences
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：8
• 期：6
• 页码：3403-3416
• 全文大小：1,804 KB
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  Guo JH, O’Brien PJ
• 作者单位：Yu Zhang (1)
  Duoyun Wang (1)
  Hua Yang (2) (3)
  Bushe Xin (1)
  Jinhua Fu (2) (3)
  Jingli Yao (2) (3)
  
  1. College of Resources Science and Technology, Beijing Normal University, Beijing, 10087, China
  2. PetroChina Changqing Oilfield Company, Xi’an, 710018, China
  3. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, 710018, China
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

LA–ICP–MS U–Pb dating has been performed on detrital zircons from the Nanyinger Group in the eastern section of the north Qilian orogenic belt in Jingyuan County, Gansu Province. The results show five major age groups: 3.1-.0, 1.8-.4, 1.4-.8, 0.6-.4, and ~0.26?Ga. Archean to Neoproterozoic zircons were derived from the central Qilian belt. The early Paleozoic grains are considered to have been derived from the magmatic arc related to ocean closure. The youngest age may be derived from the recycling of sediments prior to the Nanyinger Group. The youngest detrital zircon age (262?±-?Ma) is close to the depositional age of the strata, suggesting rapid uplift of the Qilian Mountains. In the early Indosinian, the palaeo-Qilian Mountains uplifted rapidly and provided the main source for the Hexi Corridor basins. The North Qilian Belt is the southern boundary of the Hexi Corridor basins. From the Ordovician to the Triassic, the depocenter gradually moved to the Qilian Mountains and was very close to the Qilian Mountains in the Late Triassic. By comparing with previous research, we infer that the Hexi Corridor basin may not connect with the Ordos Basin in the Triassic.