Earth Science Frontiers ›› 2021, Vol. 28 ›› Issue (6): 295-317.DOI: 10.13745/j.esf.sf.2021.1.59

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Ca. 1.90-1.80 Ga continent-continent collision in southeastern North China Craton: Evidence from the granite-greenstone belt in the Jiaobei Terrane

SHI Kangxing, WANG Changming*, DU Bin, CHEN Qi, ZHU Jiaxuan, RAO Shicheng, DUAN Hongyu   

  1. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2020-05-20 Revised:2020-12-23 Online:2021-11-25 Published:2021-11-25

Abstract: The Jiaobei Terrane is located in the southeastern part of the North China Craton (NCC), and its Archean-Paleoproterozoic lithological assemblage, including amphibolite, TTG gneiss, granodiorite, schist and supracrustal rocks, suggests a typical granite-greenstone succession. This succession offers a significant insight into the history of Precambrian tectonic evolution of the NCC and the collision-amalgamation process of microcontinents. Here we investigated a suite of amphibolite, TTG gneiss and granodiorite from the Jiaobei Terrane to understand their genesis. Detailed LA-ICP-MS U-Pd dating of zircons from the magmatic grains yielded ages of 1881±18 Ma for amphibolite, 1852±16 Ma for TTG gneiss and 1840±9 Ma for granodiorite. The inherited ages of 2332±32 Ma, 2244±25 Ma, 1935±21 Ma and the metamorphic age of 1796±17 Ma were also recorded for these zircons. The zircon Lu-Hf isotope show the εHf(t) values ranging from -4.7 to 3.9 and the crustal model ages (TDMc) in a range of 2784-2289 Ma. The results suggest that the formation of the Paleoproterozoic granite-greenstone succession in the Jiaobei Terrane is partly contaminated by the continental crust. The geochemical features of amphibolite are similar to within-plate basalt, with low SiO2, high FeOT, weak differentiation between light (LREE) and heavy REEs (HREE) and absence of obvious Ce and Eu anomalies, negative Nb and Ta anomalies and positive Rb, Pb and K anomalies. The TTG gneiss and granodiorite show enrichment of LREE and absence of obvious Ce anomaly, negative Nb, Ta, Ti and P anomalies and positive Rb, Pb, Zr and Hf anomalies. They display transitional features from post-collisional granite to within-plate granite. The parent magma of the Paleoproterozoic granite-greenstone succession in the Jiaobei Terrane is generated from the partial melts of basalts. Based on the previous studies, this paper supplements geochronological, isotopic and geochemical data of the related rocks, and proposes a ca. 1.90-1.80 Ga continent-continent collision process in the Jiaobei Terrane. Our results are consistent with the continent-continent collision model of the NCC, and they provide further insights into the Paleoproterozoic tectonic history of the Craton.

Key words: U⁃Pb geochronology, Lu⁃Hf isotope, geochemistry, Jiaobei Terrane, continent⁃continent collision

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