Volume 10 Issue 2
Jan.  2021
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Chuang Bao, Yuelong Chen, Xiangkun Zhu, Junxiang Zhao. Attribution of the Langshan Tectonic Belt: Evidence from zircon U-Pb ages and Hf isotope compositions[J]. Geoscience Frontiers, 2019, 10(2): 539-551. doi: 10.1016/j.gsf.2018.03.001
Citation: Chuang Bao, Yuelong Chen, Xiangkun Zhu, Junxiang Zhao. Attribution of the Langshan Tectonic Belt: Evidence from zircon U-Pb ages and Hf isotope compositions[J]. Geoscience Frontiers, 2019, 10(2): 539-551. doi: 10.1016/j.gsf.2018.03.001

Attribution of the Langshan Tectonic Belt: Evidence from zircon U-Pb ages and Hf isotope compositions

doi: 10.1016/j.gsf.2018.03.001
Funds:

ZDJ2017-05), the Tutor Foundation of the China University of Geosciences (Beijing) (Grant No. 53200859400) and the China Geological Survey Projects (Grant Nos. 12120114041401 and 12120113015700).

This study was supported by the National Natural Science Foundation of China (Grant No. 41473015), a research grant from the Institute of Crustal Dynamics, CEA (ZDJ2014-02

  • Received Date: 2016-12-05
  • Rev Recd Date: 2017-12-28
  • Publish Date: 2021-01-07
  • This study describes a previously unidentified Neoproterozoic mafic dyke emplaced in the northern flank of the Langshan Tectonic Belt. This dyke intruded into the micaquartz schist of the Zhaertaishan Group, and yielded an age of 908±8 Ma. The youngest U-Pb ages of micaquartz schist from the Zhaertaishan Group in the Langshan area were 1118±33 Ma, 1187±3 Ma and 1189±39 Ma, suggesting that the depositional age of the protolith of the schist was between 908±8 Ma and 1118±33 Ma. In addition, 436 U-Pb age data and 155 Lu-Hf isotopic data from six samples in the Langshan Tectonic Belt and one Permian greywacke from the Wuhai area show distinct differences between the northern and southern flanks of the Main Langshan area. The U-Pb ages of the northern flank are primarily Meso-Neoproterozoic; similar ages have not been identified in the southern flank to date. Moreover, two-stage Hf model ages of the northern flank feature three age peaks at ~900 Ma, ~1700 Ma and ~2600 Ma; this differs from Hf model ages of the southern flank, which feature one strong age peak at ~2700 Ma. These results suggest that the northern and southern flanks of the Main Langshan area have different geochronologic characteristics and should be divided further. Based on the U-Pb ages and Hf model ages, the northern and southern flanks of the Main Langshan area are named the North and South Langshan Tectonic Belts. Comparison of the U-Pb age and two-stage Hf model age distributions from the North Langshan Tectonic Belt, South Langshan Tectonic Belt, Alxa Block and the North China Craton (NCC) reveal that the North Langshan Tectonic Belt is similar to the Alxa Block and that the South Langshan Tectonic Belt is similar to the NCC. In addition, the zircon U-Pb age of 860±7 Ma commonly observed in the Alxa Block was detected in the Permian greywacke from the Wuhai area of the NCC, which suggests that the amalgamation of the North and South Langshan Tectonic belts (i.e., the amalgamation of the Alxa Block and the NCC), occurred between Devonian and late Permian.
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