LA-ICP-MS zircon U-Pb age and petrogeochemical characteristics of Late Triassic granite porphyry in Panshuihe area, West Kunlum Mountains, Xinjiang

TANG Mingying; GAO Zhenhua; DONG Zhenkun; ZHAI Xiaozhi; PAN Shiyang

Geological Bulletin of China > 2020 > 39(2-3): 206-214.

TANG Mingying, GAO Zhenhua, DONG Zhenkun, ZHAI Xiaozhi, PAN Shiyang. 2020: LA-ICP-MS zircon U-Pb age and petrogeochemical characteristics of Late Triassic granite porphyry in Panshuihe area, West Kunlum Mountains, Xinjiang. Geological Bulletin of China, 39(2-3): 206-214.

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LA-ICP-MS zircon U-Pb age and petrogeochemical characteristics of Late Triassic granite porphyry in Panshuihe area, West Kunlum Mountains, Xinjiang

1.
No.8 Exploration Institute of Geology and Mineral Resources, Rizhao 276826, Shandong, China
2.
Hubei Geological Research Laboratory, Wuhan 430034, Hubei, China

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Received Date: January 12, 2019
Revised Date: February 20, 2019
Available Online: August 15, 2023

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Abstract

Abstract

In order to further enrich the data of intrusive rocks in Heshibeihu-Sandaohezi area of West Kunlun Mountains and provide a chronologic restriction for the formation age of the Panshuihe antimony deposit, the authors studied geology, petrology, geochemistry and chronology of the granodiorite porphyry in Panshuihe.The LA-ICP-MS zircon U-Pb dating yielded the age of Panshuihe granodiorite porphyry of 210.9±2.8 Ma, suggesting Late Triassic.Rock geochemistry shows that the content of SiO₂ in Panshuihe granodiorite porphyry is 66.1%~72.03%, the content of total alkali (Na₂O+K₂O) is 5.95%~8.29%, and the average value is 7.10%.The feature K₂O > Na₂O shows that the rock is rich in potassium and belongs to a high potassium (calc-alkaline) rock. The total REE is relatively low, and it shows strong enrichment of light rare earth elements, slight loss of europium (Eu=0.66~0.90), relative enrichment of Rb, Th, Ta, Ce and Hf, and relative dilution of Ba, K, P and Ti.The tectonic environment classification diagram shows that the Panshuihe granodiorite porphyry was formed in the tectonic environment of syn-collision, and that the syn-collision orogeny occurred on the northwestern margin of the Songpan-Garze landmass in this area from the Late Variscan to the Indosinian period, and the north lake of Heshibeihu-Sandaohezi magmatic belt in the area was formed by this orogenesis and the transition from ocean to land.
- Panshuihe area,
- granodiorite-porphyry,
- S-type granite,
- LA-ICP-MS zircon U-Pb age,
- geochemical characteristics

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LA-ICP-MS zircon U-Pb age and petrogeochemical characteristics of Late Triassic granite porphyry in Panshuihe area, West Kunlum Mountains, Xinjiang