Chinese Science Bulletin

, Volume 52, Issue 7, pp 942–948 | Cite as

Zircon U-Pb geochronology of basement metamorphic rocks in the Songliao Basin

  • Pei FuPing 
  • Xu WenLiang Email author
  • Yang DeBin 
  • Zhao QuanGuo 
  • Liu XiaoMing 
  • Hu ZhaoChu 


Zircon LA-ICP MS U-Pb dating of six metamorphic rocks and a metagranite (breccia) from southern basement of the Songliao Basin are reported in order to constrain the formation ages of basement. The basement metamorphic rocks in the Songliao Basin mainly consist of metagabbro (L45-1), amphibolite (SN117), metarhyolitical tuff (G190), sericite (Ser) schist (N103), chlorite (Chl) schist (T5-1), biotite (Bi)-actinolite (Act)-quartz (Q) schist (Y205), and metagranite (L44-1). The cathodoluminesence (CL) images of the zircons from metagabbro (L45-1) and metagranite (L44-1) indicate that they have cores of magmatic origin and rims of metamorphic overgrowths. Their U-Pb isotopic ages are 1808±21 Ma and 1873±13 Ma, respectively. The zircons with oscillatory zoning from amphibolite (SN117) and Chl schist (T5-1), being similar to those of mafic igneous rocks, yield ages of 274 ± 3.4 Ma and 264 ± 3.2 Ma, respectively. The zircons from metarhyolitical tuff (G190) and Ser schist (N103) display typical magmatic growth zoning and yield ages of 424 ± 4.5 Ma and 287 ± 5.1Ma, respectively. Most of zircons from Bi-Act-Q schist (Y205) are round in shape and different in absorption degree in the CL images, implying their sedimentary detritals. U-Pb dating yield concordant ages of 427 ± 3.1Ma, 455 ± 12 Ma, 696 ± 13 Ma, 1384±62 Ma, 1649±36 Ma, 1778±18 Ma, 2450±9 Ma, 2579±10 Ma, 2793±4 Ma and 2953±14 Ma. The above-mentioned results indicate that the Precambrian crystalline basement (1808–1873 Ma) exists in the southern Songliao Basin and could be related to tectonic thrust, and that the Early Paleozoic (424–490 Ma) and Late Paleozoic magmatisms (264–292 Ma) also occur in the basin basement, which are consistent with the ages of the detrital zircons from Bi-Act-Q schist in the basement.


Songliao Basin basement metamorphic rock zircon geochronology 


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Copyright information

© Science in China Press 2007

Authors and Affiliations

  • Pei FuPing 
    • 1
  • Xu WenLiang 
    • 1
    Email author
  • Yang DeBin 
    • 1
  • Zhao QuanGuo 
    • 1
  • Liu XiaoMing 
    • 2
  • Hu ZhaoChu 
    • 2
  1. 1.College of Earth SciencesJilin UniversityChangchunChina
  2. 2.Key Laboratory of Continental DynamicsNorthwest UniversityXi’anChina

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