Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt

SUN Chongbo; LI Zhongquan; WANG Daoyong; XU Yuanping; LI Tao; ZHAO Yunchuan

2017 Vol. 36, No. 2-3

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SUN Chongbo, LI Zhongquan, WANG Daoyong, XU Yuanping, LI Tao, ZHAO Yunchuan. Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt[J]. Geological Bulletin of China, 2017, 36(2-3): 190-198.

Citation:

SUN Chongbo, LI Zhongquan, WANG Daoyong, XU Yuanping, LI Tao, ZHAO Yunchuan. Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt[J]. Geological Bulletin of China, 2017, 36(2-3): 190-198.

Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt

1.
Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources (Chengdu University of Technology)/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology) Chengdu 610059, Sichuan, China
2.
Hydro-Engineering Party of Sichuan Metallurgical Geology and Exploration Bureau, Chengdu 611730, Sichuan, China

Received Date: 09 December 2015

Revised Date: 11 September 2016

Publish Date: 25 March 2017

Abstract

Abstract

This paper presents bulk petrogeochemistry and zircon U-Pb dating results for the Yangzong rhyolite porphyry in Luchun County, Yunnan Province. LA-ICP-MS zircon U-Pb dating results show that the Yangzong rhyolite porphyry was formed in the Late Permian (263.1±2.3Ma). The Yangzong rhyolite porphyry is characterized by SiO₂ content of 71.08%~80.26%, alkali (Na₂O+ K₂O) 4.67%~8.67%, and Na₂O＜K₂O. It is enriched in LREE and Rb, Th, U, Ni, Cs, Zr, Hf, As, K and depleted in Sr, Ta, Ba, Cr, Zn, W with negative Eu anomalies (δEu=0.05~0.57). According to the diagrams, the Yangzong rhyolit porphyry was formed in the tectonic environment of island arc-continent or continental-arc collision, indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailao Mountain tectonic belt might have been closed in the Late Permian (263.1±2.3Ma).
- rhyolite porphyry /
- LA-ICP-MS zircon U-Pb ages /
- petrogeochemistry /
- intraplate granite

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References

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