1887

Abstract

Summary

In central Yarlung-Zangbo Suture zone, southern Tibet, there exist two subparallel E-W trending linear aeromagnetic high anomalies, ca. 25 km apart. The north magnetic lineament is related to Gangdese batholith, the south one is Xigaze ophiolites, and they are separated by Xigaze fore-arc basin. Gangdese granitoid batholith is formed during Mesozoic arc magmatism and Cenozoic syn-collisional magmatism in the southern margin of Lhasa terrane, producing strong-magnetized rocks, e.g. I-type granites, diorite and minor gabbro. We conduct 3D inversion of the aeromagnetic anomaly data to explore the deep structure of Gangdese batholith.By analysis of our inverted model, we propose that Gangdese batholith has a magmatic root with higher magnetization than the exposed granitoids, indicating the deeper part of Gangdese batholith may contain more mafic constitutes.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201901495
2019-06-03
2024-04-20
Loading full text...

Full text loading...

References

  1. An, M.J. and Shi, Y.L.
    [2007] 3D temperature of crust and lithosphere mantle in Chinese continent. Science China (D), 37(6), 736–745.
    [Google Scholar]
  2. Blakely, R. J., Brocher, T. M. and Wells, R. E.
    [2005] Subduction-zone magnetic anomalies and implications for hydrated forearc mantle. Geology, 33, 445–448.
    [Google Scholar]
  3. Dong, G.C., Mo, X.X., Zhao, Z.D., Zhu, D.C., Song, Y.T. and Wang, L.
    [2008] Gabbros from southern Gangdsese: implication for mass exchange between mantle and crust. Acta Petrologica Sinica, 24(2): 203–210.
    [Google Scholar]
  4. Ferraccioli, F., Jones, P.C., Vaughan, A.P.M. and Leat, P.T.
    [2006] New aerogeophysical view of the Antarctic Peninsula: More pieces, less puzzle. Geophysical Research Letters, 33.
    [Google Scholar]
  5. Finn, C.
    [1994] Aeromagnetic evidence for a buried Early Cretaceous magmatic arc, northeast Japan. Journal of Geophysical Research, 99, 22165–22185.
    [Google Scholar]
  6. Guo, X.Y., Li, W.H., Gao, R., Xu, X., Li, H.Q., Huang, X.F., Zhuo, Y., Lu, Z.W. and Klemperer, S.L.
    [2017] Nonuniform subduction of the Indian crust beneath the Himalayas. Scientific Reports, 7, 12497.
    [Google Scholar]
  7. Ji, W.Q., Wu, F.Y., Chung, S.L., Li, J.X. and Liu, C.Z.
    [2009] Zircon U–Pb geochronology and Hf isotopic constraints on petrogenesis of the Gangdese batholith, southern Tibet. Chemical Geology, 262, 229–245.
    [Google Scholar]
  8. Li, Y.G. and Oldenburg, D.W.
    [1996] 3-D inversion of magnetic data. Geophysics, 61, 396–408.
    [Google Scholar]
  9. Ma, X.X., Meert, J.G., Xu, Z.Q. and Zhao, Z.B.
    [2017] Evidence of magma mixing identified in the Early Eocene Caina pluton from the Gangdese Batholith, southern Tibet. Lithos, 278–281, 126–139.
    [Google Scholar]
  10. Meng, G.Y., Zhao, Z.D., Zhu, D.C., Mo, X.X., Guan, Q., Huang, Y., Dong, G.C., Zhou, S., DePaolo, D.J., Harrison, T.M., Zhang, Z.C., Liu, J.L., Liu, Y.S., Hu, Z.C. and Yuan, H.L.
    [2014] Late Cretaceous magmatism in Mamba area, central Lhasa subterrane: Products of back-arc extension of Neo-Tethyan Ocean?Gondwana Research, 26, 505–520.
    [Google Scholar]
  11. Mo, X.X., Dong, G.C., Zhao, Z.D., Guo, T.Y., Wang, L.L. and Chen, T.
    [2005] Timing of Magma Mixing in the Gangdise Magmatic Belt during the India-Asia Collision: Zircon SHRIMP U-Pb Dating. Acta Geologica Sinica, 79, 66–76.
    [Google Scholar]
  12. Vaughan, A.P.M., Wareham, C.D., Johnson, A.C. and Kelley, S.P.
    [1998] A Lower Cretaceous, synextensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica. Earth and Planetary Science Letters, 158, 143–155.
    [Google Scholar]
  13. Wu, F.Y., Ji, W.Q., Liu, C.Z. and Chung, S.L.
    [2010] Detrital zircon U–Pb and Hf isotopic data from the Xigaze fore-arc basin: Constraints on Transhimalayan magmatic evolution in southern Tibet. Chemical Geology, 271, 13–25.
    [Google Scholar]
  14. Williams, H., Turner, S., Kelley, S. and Harris, N.
    [2001] Age and composition of dikes in Southern Tibet: New constraints on the timing of east-west extension and its relationship to postcollisional volcanism. Geology, 29, 339–342.
    [Google Scholar]
  15. Xiong, S.Q., Yang, H., Ding, Y.Y. and Li, Z.K.
    [2016] Characteristics of Chinese continent Curie point isotherm. Chinese Journal of Geophysics, 59(10), 3604–3617.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201901495
Loading
/content/papers/10.3997/2214-4609.201901495
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error