Petrogenesis and tectonic setting of Middle Silurian A-type granite in Kaerqueka area, East Kunlun

CHEN Haifu; HE Shuyue; ZHANG Aikui; SUN Jinlei; YAN Zhengping; LIU Jinlong; ZHANG Liang; QIAN Ye

2021 Vol. 40, No. 8

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CHEN Haifu, HE Shuyue, ZHANG Aikui, SUN Jinlei, YAN Zhengping, LIU Jinlong, ZHANG Liang, QIAN Ye. Petrogenesis and tectonic setting of Middle Silurian A-type granite in Kaerqueka area, East Kunlun[J]. Geological Bulletin of China, 2021, 40(8): 1380-1393.

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CHEN Haifu, HE Shuyue, ZHANG Aikui, SUN Jinlei, YAN Zhengping, LIU Jinlong, ZHANG Liang, QIAN Ye. Petrogenesis and tectonic setting of Middle Silurian A-type granite in Kaerqueka area, East Kunlun[J]. Geological Bulletin of China, 2021, 40(8): 1380-1393.

Petrogenesis and tectonic setting of Middle Silurian A-type granite in Kaerqueka area, East Kunlun

1.
Qinghai Provincial Non-ferrous Metal Geological and Minerals Exploration Bureau, Xining 810001, Qinghai, China
2.
The Thirdly Geological Survey Institute of Qinghai Province, Xining 810029, Qinghai, China
3.
College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China
4.
Shenyang Center, China Geological Survey, Shenyang 110000, Liaoning, China
5.
Zhengzhou Institute of Multipurpose Utilization of Mineral Resource, Chinese Academy of Geological Sciences, Zhengzhou 450006, Henan, China

More Information

Corresponding author: SUN Jinlei, jinleisun123@163.com

Received Date: 01 December 2020

Revised Date: 07 May 2021

Publish Date: 15 August 2021

Abstract

Abstract

A lot of porphyritic monzogranites are outcropped in the Kaerqueka area, west of the East Kunlun orogenic belt.Zircon U-Pb age and geochemistry of the porphyritic monzonites were studied.Zircon U-Pb dating yields an age of 425±2.3 Ma, indicating Middle Silurian.The rocks are characterized by high contents of SiO₂(69.0%~71.2%) and K₂O(4.3%~5.54%), enrichment of large ion lithophile element(Rb, K, Th and U), depletion of high field strength element(Nb, Ta and Ti), and strong Eu negative anomaly(Eu/Eu^*=0.40~0.51).Their lower content of Cr, Ni(Cr=13.81×10^-6~32.9×10^-6, Ni=5.48×10^-6~12.05×10^-6) and the lower Ce/Pb (2.01~4.19) and Nb/U(4.1~7.57) values indicate that they were originated from partial melting of the upper crust.The high ratio of 10000Ga/Al (3.22~3.42), high contents of Zr+Nb+Ce+Y(459×10^-6~656×10^-6) and zircon saturation temperature(827~881℃) imply they belong to A-type granite.Tectonic diagram and high Y/Nb ratio(2.93~3.15) indicate that they are A₂ type granites, and were formed in the post-collision extension setting.Combined with the spatial and temporal distribution of magmatic rocks in the region, it is suggested that the East Kunlun Orogen entered the post-collision extension stage from the Middle Silurian period.
- A-type granite /
- Middle Silurian /
- post-collision extension /
- Kaerqueka area /
- East Kunlun orogen

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References

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