LA-ICP-MS zircon U-Pb dating of Nanshan subduction type intrusion in Qinghai Province and its geological significance

TIAN Qi; SHI Yulian; HAO Yaqing; QIANG Xiaonong; LI Shenghu

2018 Vol. 37, No. 7

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TIAN Qi, SHI Yulian, HAO Yaqing, QIANG Xiaonong, LI Shenghu. LA-ICP-MS zircon U-Pb dating of Nanshan subduction type intrusion in Qinghai Province and its geological significance[J]. Geological Bulletin of China, 2018, 37(7): 1258-1270.

Citation:

TIAN Qi, SHI Yulian, HAO Yaqing, QIANG Xiaonong, LI Shenghu. LA-ICP-MS zircon U-Pb dating of Nanshan subduction type intrusion in Qinghai Province and its geological significance[J]. Geological Bulletin of China, 2018, 37(7): 1258-1270.

LA-ICP-MS zircon U-Pb dating of Nanshan subduction type intrusion in Qinghai Province and its geological significance

1.
College of Earth Science, Jilin University, Changchun 130061, Jilin, China
2.
No.5 Geological and Mineral Survey Institute of Qinghai Province, Xi'ning 810099, Qinghai, China

Received Date: 20 April 2017

Revised Date: 09 October 2017

Publish Date: 25 July 2018

Abstract

Abstract

The Nanshan intrusion consists of monzonitic granite, granodiorite and tonalite, geochemically belonging to subduction type granite. The high precision LA-ICP-MS denudation plasma mass spectrometry (laser) single particle zircon micro area U-Pb isotopic dating yielded 446.1±3.5Ma, 447.2±5.3Ma, and 443.6±8.6Ma for monzonitic granite, granodiorite and tonalite, respectively, which indicates the Caledonian movement in the Qilian orogenic belt in the geological record. The rock-forming ages of the three different types of rocks may represent southward subduction of the Lajishan orogenic belt. The determination of the rock-forming epoch and tectonic environment of the Nanshan subduction type intrusion is of great significance for the tectonic evolution and dynamics mechanism of the Lajishan orogenic belt.
- Nanshan in Qinghai Province /
- subduction type intrusion /
- LA-ICP-MS zircon U-Pb dating /
- tectonic significance

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References

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