U-Pb dating of detrital zircons from the Wudangshan Group in the South Qinling and its geological significance

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• 作者：WenLi Ling (1) (2)
  RuiChun Duan (1) (3)
  XiaoMing Liu (1) (4)
  JianPing Cheng (1)
  XinWu Mao (5)
  LianHong Peng (5)
  ZaoXue Liu (5)
  HongMei Yang (1) (3)
  BangFang Ren (1) (6)
  
• 关键词：Detrital zircon ; U ; Pb geochronology ; South Qinling ; South China Block ; Neoproterozoic evolution
• 刊名：Chinese Science Bulletin
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：55
• 期：22
• 页码：2440-2448
• 全文大小：1511KB
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• 作者单位：WenLi Ling (1) (2)
  RuiChun Duan (1) (3)
  XiaoMing Liu (1) (4)
  JianPing Cheng (1)
  XinWu Mao (5)
  LianHong Peng (5)
  ZaoXue Liu (5)
  HongMei Yang (1) (3)
  BangFang Ren (1) (6)
  
  1. Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
  2. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan, 430074, China
  3. Yichang Institute of Geology and Mineral Resources, Yichang, 443003, China
  4. State Key Laboratory of Continental Geodynamics, Northwest University, Xi’an, 710069, China
  5. Geological Survey of Hubei Province, Wuhan, 430022, China
  6. Tianjin Institute of Geology and Mineral Resources, Tianjin, 300170, China
  
• ISSN：1861-9541

文摘

U-Pb dating was made by the LA-ICP-MS method for detrital zircons from the Wudangshan volcanic-sedimentary succession in the South Qinling. Samples comprise quartz sandstones of the Wudangshan Group collected from the base of the Yangping Formation and an upper layer of the Shuangtai Formation overlain its volcanic sequence, and two river-sand collections from the drainage systems cutting across the two formations, respectively. The results show that the Yangping detrital zircons are dominated by 830-80 Ma grains with a minor population of ?.0-.84 Ga and sporadic grains of ?.6, ?.4 and 2.0 Ga, whereas the Shuangtai zircons yield an upper intercept age of 763±33 Ma, identical to the timing of the Wudangshan volcanism within error, with few concordant grains of 1.9 and 0.86 Ga. Age spectra for the two river-sand samples are similar to those of the Yangping and Shuangtai Formations, respectively. It thus suggests that the Wudangshan strata are less than 780 Ma, whereas their major detrital zircon populations of 1.0-.85 Ga and 830-80 Ma are consistent with timing of the Hannan magmatic activities along the northwestern margin of the South China Block. This suggests a Hannan or adjacent area provenance for the Wudangshan strata. The Wudang area is characterized by rift-related igneous events at ?55 and ?80 Ma, respectively, pointing to a tectono-magmatic history different from the Hannan area. It is inferred that the ?55 Ma magmatism is likely to indicate a separation of the South China Block from the supercontinent Rodinia, while the ?80 Ma event suggests a further split between the South Qinling and some unknown continent.