Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting

Hui Zhao; Jingsui Yang; Fei Liu; Jian Huang; Li Zhang

doi:10.1007/s12583-019-1228-7

Volume 30 Issue 3

Jun 2019

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Journal of Earth Science > 2019 > 30(3): 571-584.

Hui Zhao, Jingsui Yang, Fei Liu, Jian Huang, Li Zhang. Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting. Journal of Earth Science, 2019, 30(3): 571-584. doi: 10.1007/s12583-019-1228-7

Citation:

Hui Zhao, Jingsui Yang, Fei Liu, Jian Huang, Li Zhang. Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting. Journal of Earth Science, 2019, 30(3): 571-584. doi: 10.1007/s12583-019-1228-7

Citation:

Hui Zhao, Jingsui Yang, Fei Liu, Jian Huang, Li Zhang. Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting. Journal of Earth Science, 2019, 30(3): 571-584. doi: 10.1007/s12583-019-1228-7

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Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting

doi: 10.1007/s12583-019-1228-7

Hui Zhao^1,2,3,
Jingsui Yang^{3
,
,},
Fei Liu³,
Jian Huang⁴,
Li Zhang⁵

1.
Harbin Institute of Technology, Southern University of Science and Technology, Harbin 150001, China
2.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China
3.
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
Yunnan Tuocheng Industrial Co., Kunming 650051, China
5.
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

Funds:

National Natural Science Foundation of China 41672063

China Geological Survey DD20160022-01

National Natural Science Foundation of China 41720104009

China Geological Survey DD20160023-01

National Natural Science Foundation of China 41773029

This study was supported by the Ministry of Science and Technology of China 2014DFR21270

More Information

Corresponding author: Jingsui Yangì
Received Date: 21 Oct 2018
Accepted Date: 20 Apr 2019
Publish Date: 01 Jun 2019

Abstract

Abstract

Post-collisional potassic and ultrapotassic volcanic rocks are widely distributed across the Tibetan Plateau, and they are considered to be indicators of evolving mantle dynamics. A suite of potassic basalts younger than 55 Ma from the Saga area of western Tibet has been reported. The geochemical characteristics of these rocks distinguish themselves from other potassic-ultrapotassic volcanic rocks in Tibet, such as positive Nb, Ta, and Ti anomalies and strong enrichment in large ion lithophile elements (LILE), suggesting that phlogopite, rutile and/or sphene might have originated from the mantle source. These basalts are also characterized by a very wide range of ⁸⁷Sr/⁸⁶Sr ratios (0.709 043-0.711 915) and relatively high ¹⁴³Nd/¹⁴⁴Nd ratios (0.512 426-0.512 470, ε_Nd=-4.60 to -3.87). We propose a petrogenetic model for the Saga potassic rocks in which the lithospheric mantle source was infiltrated by a volatilerich (H₂O, CO₂) and low-degree silicate melt derived from the asthenosphere in the Middle to Late Proterozoic. After the initial Indo-Asian collision, Neo-Tethyan slab breakoff resulted in the partial melting of the previously metasomatized lithospheric mantle and the formation of the Saga potassic rocks. It is likely that the eruption of these volcanic rocks lasted at least 10 Ma.
- potassic volcanic rocks,
- basalt,
- Sr-Nd isotopes,
- Saga area,
- western Tibet

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References(97)

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Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting

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Post-Collisional, Potassic Volcanism in the Saga Area, Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting

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