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

Kaixuan Li; Huaying Liang; Zhiwei Bao; Wenting Huang; Jian Zhang; Long Ren

doi:10.1007/s12583-018-0862-9

Volume 30 Issue 1

Jan 2019

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Journal of Earth Science > 2019 > 30(1): 20-36.

Kaixuan Li, Huaying Liang, Zhiwei Bao, Wenting Huang, Jian Zhang, Long Ren. Petrogenesis of the Payangazu Complex in Southern Mandalay, Central Myanmar and Its Tectonic Implications. Journal of Earth Science, 2019, 30(1): 20-36. doi: 10.1007/s12583-018-0862-9

Citation:

Kaixuan Li, Huaying Liang, Zhiwei Bao, Wenting Huang, Jian Zhang, Long Ren. Petrogenesis of the Payangazu Complex in Southern Mandalay, Central Myanmar and Its Tectonic Implications. Journal of Earth Science, 2019, 30(1): 20-36. doi: 10.1007/s12583-018-0862-9

Citation:

Kaixuan Li, Huaying Liang, Zhiwei Bao, Wenting Huang, Jian Zhang, Long Ren. Petrogenesis of the Payangazu Complex in Southern Mandalay, Central Myanmar and Its Tectonic Implications. Journal of Earth Science, 2019, 30(1): 20-36. doi: 10.1007/s12583-018-0862-9

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

doi: 10.1007/s12583-018-0862-9

1.
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

the Natural Science Foundation of China 41772065

the National Key R & D Program of China 2016YFC0600407

the Natural Science Foundation of China 41421062

More Information

Corresponding author: Liang Huaying
Received Date: 18 May 2018
Accepted Date: 03 Nov 2018
Publish Date: 01 Feb 2019

Abstract

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 ε_Hf(t) value of +0.6, initial ⁸⁷Sr/⁸⁶Sr ratios of 0.708 6 to 0.710 0, and ε_Nd(t) values of -4.8 to -4.9; whereas rocks of the granodiorite are relatively isotopically enriched, with ε_Hf(t) values of -5.1 to -7.2, initial ⁸⁷Sr/⁸⁶Sr ratios of 0.711 7 to 0.711 8, and ε_Nd(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 ε_Nd(t), ε_Hf(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.
- central Myanmar,
- zircon U-Pb age,
- isotope,
- Early Cretaceous subduction

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References(74)

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