Zircon U-Pb age and geochemistry of the Guangmashan monzonitic porphyry in Ninglang, Yunnan Province

WANG Hong; ZHANG Jinrang; ZHOU Qing; SUN Zhiming; WANG Yiwei; CHEN Gang

2019 Vol. 38, No. 11

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WANG Hong, ZHANG Jinrang, ZHOU Qing, SUN Zhiming, WANG Yiwei, CHEN Gang. Zircon U-Pb age and geochemistry of the Guangmashan monzonitic porphyry in Ninglang, Yunnan Province[J]. Geological Bulletin of China, 2019, 38(11): 1858-1866.

Citation:

WANG Hong, ZHANG Jinrang, ZHOU Qing, SUN Zhiming, WANG Yiwei, CHEN Gang. Zircon U-Pb age and geochemistry of the Guangmashan monzonitic porphyry in Ninglang, Yunnan Province[J]. Geological Bulletin of China, 2019, 38(11): 1858-1866.

Zircon U-Pb age and geochemistry of the Guangmashan monzonitic porphyry in Ninglang, Yunnan Province

1.
Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China
2.
Northwest Sichuan Geological Party, Bureau of Geology and Mineral Resources Exploration of Sichuan Province, Mianyang 621000, Sichuan, China

Received Date: 09 August 2018

Revised Date: 10 October 2018

Publish Date: 15 November 2019

Abstract

Abstract

The Guangmashan monzonitic porphyry in Ninglang is located between Xiaojinhe and Binchuan-Chenhai faults in western Yangtze block. In this paper, the authors carried out LA-ICP-MS zircon U-Pb dating for the monzonite porphyry and obtained a weighted mean age of 33.37±0.26Ma, suggesting Oligocene, which is consistent with the main formation age of Lijiang-Beiya alkali-rich porphyritic belt. The monzonite porphyry shows peraluminous alkaline affinities, with SiO₂ content of 61.55%~69.13%, (Na₂O+K₂O) content of 8.85%~10.92%, N/K ratio of 0.88~1.07, A/NK ratio of 1.54~1.84, and A/CNK ratio of 1.23~1.72. It is also enriched in LREE but depleted in HREE, with high ratio La/Yb, low Y and Yb content, and low values of Mg^#(< 0.5). The porphyry shows continent-type potassium C-type adakite characteristics, and might have been derived by partial melting of the thickened lower crust caused by Jinshajiang-Red River strike-slip fault system, formed in an extensional setting at post-collisional stage, caused by the collision between the India and Eurasian blocks.
- zircon U-Pb age /
- geochemistry /
- monzonitic porphyry /
- Ninglang

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