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Arabian Journal of Geosciences

, 12:568 | Cite as

The Middle–Late Silurian granitoids in the Eastern Kunlun Orogenic Belt, NW China: petrogenesis and implications for tectonic evolution

  • Ying-Chao Wang
  • Feng-Yue SunEmail author
Original Paper
  • 9 Downloads

Abstract

The Eastern Kunlun Orogenic Belt lay on a significant tectonic boundary between Gondwana and Eurasia, produced widespread granitoids, and recorded at least two orogenic episodes since the Phanerozoic eon. In this paper, we provided new petrography, geochemistry, zircon U–Pb dating, and Lu–Hf isotopic research on the Middle–Late Silurian granitoids from the eastern segment of The Eastern Kunlun Orogenic Belt. These granitoids comprised of Zhongzhigou granodiorites and Xintuo alkali-feldspar granites, formed in the Middle–Late Silurian (420–425 Ma). Geochemically, the granodiorites exhibit high Sr/Y (31.2–35.2) as adakitic affinities, and alkali-feldspar granites belong to highly fractionated I-type granites. Additionally, granodiorites have zircon εHf(t) values show limited positive variations from − 0.5 to + 3.2, with two-stage Hf model ages (TDM2) of 1105–1306 Ma, while alkali-feldspar granites show negative zircon εHf(t) values ranged from − 4.6 to − 0.1 with two-stage Hf model ages (TDM2) of 1289–1541 Ma, implying that their primary magma originated from different sources. Taken together, we conclude that granodiorites had been derived from partial melting of the juvenile newly underplated mafic lower crust, while alkali-feldspar granites were derived from partial melting of the shallower ancient crustal source. Combined with temporal and spatial distribution of magmatic activities, sedimentation, and metamorphism, it can be concluded that the whole EKOB underwent a transition from syn-collision compression to post-collision extension and extensive crustal reworking occurred during the Middle–Late Silurian.

Keywords

Eastern Kunlun Orogenic Belt Geochronology Granitoids Proto-Tethys Ocean Post-collision extension 

Notes

Acknowledgments

We are grateful to the staff of Testing Center of Jilin University for their advice and assistance in major and trace elements analysis. We thank Yanduzhongshi Geological Analysis Laboratories Ltd. for their assistance during zircon U–Pb dating by LA–ICP–MS and the Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, China, for their assistance in zircon Hf isotopic analyses.

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© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.College of Earth SciencesJilin UniversityChangchunChina

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