Skip to main content
Log in

Petrogenesis of the Payangazu Complex in Southern Mandalay, Central Myanmar and Its Tectonic Implications

  • Published:
Journal of Earth Science Aims and scope Submit manuscript

Abstract

The Payangazu complex in the central Myanmar is composed mainly of quartz diorite, granodiorite, and some synplutonic mafic dikes. The quartz diorite and granodiorite have zircon U-Pb ages of 130.5±4.0 (MSWD=3.5) and 118.4±2.5 Ma (MSWD=2.4), respectively. Rock samples of the quartz diorite and granodiorite are metaluminous, enriched in large-ion lithophile elements like LREE, Rb, Th, and U, and depleted in high field-strength elements such as HREE, Nb, Ta, P, and Ti, indicative of arc-type magmatic affinities. Whole rock samples of the quartz diorite have εHf(t) value of +0.6, initial 87Sr/86Sr ratios of 0.708 6 to 0.710 0, and εNd(t) values of -4.8 to -4.9; whereas rocks of the granodiorite are relatively isotopically enriched, with εHf(t) values of -5.1 to -7.2, initial 87Sr/86Sr ratios of 0.711 7 to 0.711 8, and εNd(t) values of -8.7 to -8.8. The isotopic data together with the high Mg# (both the quartz diorite and granodiorite have Mg# values of >40) suggest a strong involvement of mantle materials in the genesis of the parent magmas. The possible petrogenetic process may be that the ascending of melts from partial melting of metasomatized mantle wedge triggered by dehydration of subducted slab resulted in partial melting of the lower crust and mixed with the latter. These Early Cretaceous intrusions from the complex are older than those found in the eastern Wuntho-Popa arc in western Myanmar, eastern Himalaya, and western Yunnan which are interpreted to be related to the Neo-Tethyan subduction, and have εNd(t), εHf(t) values lower than the latter. On the contrary, the ages and geochemical characteristics of the Payangazu complex are consistent with some of the intrusions in the northern magmatic belt in Tibet, eastern Himalaya, and western Yunnan which are believed to be associated with the subduction of the Bangong-Nujiang Ocean crust. Thus, we propose that the Early Cretaceous intrusions in the central Myanmar are most likely related to the southward subduction of an ocean slab that was possibly an extension of the Bangong-Nujiang Ocean.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References Cited

Download references

Acknowledgments

This Study was supported by the National Key R & D Program of China (No. 2016YFC0600407) and the Natural Science Foundation of China (Nos. 41772065, 41421062). We thank Dr. Swe Win, Mr. Kyaing Sein and Soe Thura Tun for their assistance during our fieldwork. The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0862-9.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Huaying Liang.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Li, K., Liang, H., Bao, Z. et al. Petrogenesis of the Payangazu Complex in Southern Mandalay, Central Myanmar and Its Tectonic Implications. J. Earth Sci. 30, 20–36 (2019). https://doi.org/10.1007/s12583-018-0862-9

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12583-018-0862-9

Key words

Navigation