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International Journal of Earth Sciences

, Volume 108, Issue 6, pp 1979–1999 | Cite as

Petrogenesis of early Late Cretaceous Asa-intrusive rocks in central Tibet, western China: post-collisional partial melting of thickened lower crust

  • An-Bo Luo
  • Ming WangEmail author
  • Cai Li
  • Chao-Ming Xie
  • Jian-jun Fan
  • Tian-Yu Zhang
  • Jin-Heng Liu
  • Wei Wang
Original Paper
  • 106 Downloads

Abstract

The timing and mechanisms of collapse of the middle and western segments of the Lhasa–Qiangtang orogenic belt in central Tibet are poorly constrained. Here, we report whole-rock geochemical, and zircon U–Pb age and Hf-isotopic data for the Asa-intrusive rocks located at the southern edge of the northern Lhasa subterrane. The Asa-intrusive rocks include the Namujeler granite porphyry (NGP), the Gernicamdro granodiorite porphyry (GGDP), and the Neeze granodiorite porphyry (NGDP). The NGP and GGDP have adakitic geochemical characteristics, such as high Sr (317–511 ppm), Sr/Y (57.8–96.8), and (La/Yb)N (13.1–16.0), and low Y (4.68–5.49 ppm) and heavy rare-earth element contents (e.g., 0.44 ≤ Yb ≤ 0.57 ppm). In situ zircon U–Pb dating of three samples yielded Late Cretaceous ages (NGP = 88.7 Ma; GGDP = 89.7 Ma; NGDP = 90.1 Ma). Zircon εHf(t) values vary over a wide range (NGP = − 11.5 to + 9.3; GGDP = + 4.6 to + 7.6; NGDP = − 21.2 to + 7.6). Our results suggest that the Asa adakitic rocks (NGP and GGDP) are most likely generated by partial melting of thickened mafic lower crust under a garnet-bearing amphibolite facies. The presence of the Asa adakitic rocks indicates that the crust beneath the Lhasa–Qiangtang collision zone had experienced thickening and the crustal thickness remains quite large (> 40 km) at ca.90 Ma. On the basis of evidence from the Asa-intrusive suite and coeval igneous rocks, along with some stratigraphic and tectonic constraints, we proposed that the middle and western segments of the Lhasa–Qiangtang orogenic belt was collapsed by lithospheric delamination during the early Late Cretaceous (ca. 94–82 Ma), and the thickened lithospheric keel did not delaminate as a wholly, it delaminated piece by piece. From east to west, the time of the lithospheric delamination is getting younger.

Keywords

Tibet Lhasa–Qiangtang orogenic belt Orogenic collapse Adakitic rocks Late Cretaceous 

Notes

Acknowledgements

We are not only grateful to Bin Wang and Yu-xuan Zhang for their help in the field, but also to Ms. Li Su, Lin-han Li, Xiao-wen Zeng, and Zhong-wei Gao for their help in the labs. We thank anonymous reviewers for their constructive comments. This research was supported by the National Natural Science Foundation of China (Grant Nos. 41402190 and 41602230) and the Program of China Geological Survey (Grant Nos. 121201010000150014 and DD20160026).

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Copyright information

© Geologische Vereinigung e.V. (GV) 2019

Authors and Affiliations

  • An-Bo Luo
    • 1
  • Ming Wang
    • 1
    Email author
  • Cai Li
    • 1
  • Chao-Ming Xie
    • 1
  • Jian-jun Fan
    • 1
  • Tian-Yu Zhang
    • 1
  • Jin-Heng Liu
    • 1
  • Wei Wang
    • 1
  1. 1.College of Earth SciencesJilin UniversityChangchunChina

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