Geochemistry, zircon U-Pb age and tectonic settings of pillow basalts in the Langshan area on the northern margin of the Alxa block, Inner Mongolia

ARKIN Amirdin; XIE Guoai; ZHANG Jin; QU Junfeng; TIAN Rongsong; ZHAO Heng; LI Fahao; LI Tian

2019 Vol. 38, No. 5

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ARKIN Amirdin, XIE Guoai, ZHANG Jin, QU Junfeng, TIAN Rongsong, ZHAO Heng, LI Fahao, LI Tian. Geochemistry, zircon U-Pb age and tectonic settings of pillow basalts in the Langshan area on the northern margin of the Alxa block, Inner Mongolia[J]. Geological Bulletin of China, 2019, 38(5): 810-823.

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ARKIN Amirdin, XIE Guoai, ZHANG Jin, QU Junfeng, TIAN Rongsong, ZHAO Heng, LI Fahao, LI Tian. Geochemistry, zircon U-Pb age and tectonic settings of pillow basalts in the Langshan area on the northern margin of the Alxa block, Inner Mongolia[J]. Geological Bulletin of China, 2019, 38(5): 810-823.

Geochemistry, zircon U-Pb age and tectonic settings of pillow basalts in the Langshan area on the northern margin of the Alxa block, Inner Mongolia

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, Jiangsu, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

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Corresponding author: XIE Guoai, njuxie@nju.edu.cn

Received Date: 26 September 2018

Revised Date: 02 January 2019

Publish Date: 15 May 2019

Abstract

Abstract

The tectonic setting of the Langshan area, which is located on the northeastern margin of the Alxa block in Inner Mongolia, has always been controversial. This paper presents the results of zircon U-Pb geochronology and geochemical data of pillow basalts in the Langshan area. The basalt LA-ICP-MS zircon U-Pb dating results show that most zircons from basalts were captured from basement. Based on the features of zircon and the age of granite invading basalt, the age of basalt is estimated to be ca. 254~252Ma, which falls into the Late Permian. Pillow basalt shows the characteristics of island arc basalt with its low alkali and low potassium, depletion of Nb, Ta, Ti, P, enrichment of Rb, Ba, U, enrichment of LREE, and depletion of HREE with weak Eu negative anomaly. It is preliminarily believed that basalt was formed on the active continental margin and was produced by southward subduction of the ancient Asian Ocean. The results indicate that the northern margin of the Alxa block was a continental marginal arc in the Late Permian, thus providing evidence for the study of the Late Paleozoic tectonic setting on the northeastern margin of the Alxa block.
- pillow basalt /
- Langshan /
- LA-ICP-MS zircon U-Pb dating /
- geochemistry /
- tectonic setting

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References

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