Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance

FANG Yong-Kun; Cao Cheng-Gang; DONG Jun-Lin; LI Ling-Gui

doi:10.11720/wtyht.2021.1185

2021 Vol. 45, No. 6

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Article navigation > Geophysical and Geochemical Exploration > 2021 > 45(6): 1367-1377

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FANG Yong-Kun, Cao Cheng-Gang, DONG Jun-Lin, LI Ling-Gui. 2021. Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance. Geophysical and Geochemical Exploration, 45(6): 1367-1377. doi: 10.11720/wtyht.2021.1185

Citation:

FANG Yong-Kun, Cao Cheng-Gang, DONG Jun-Lin, LI Ling-Gui. 2021. Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance. Geophysical and Geochemical Exploration, 45(6): 1367-1377. doi: 10.11720/wtyht.2021.1185

Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance

1. Qinghai Environmental Geological Exploration Bureau, Xining 810000, China;
2. No.906 Engineering Survey and Design Institute of Qinghai Province, Xining 810000, China;
3. Key Laboratory of Environmental Geology Qinghai Province,Xining 810000, China;
4. Qinghai Engineering Research Center of Geoenvironment Pritection and Geohazard prevention,Xining 810000, China;
5. No.5 Geological and Mineral Survey Institute of Qinghai Province, Xining 810000, China

Received Date: 19 April 2020

Revised Date: 20 December 2021

Publish Date: 21 December 2021

Abstract

Abstract

The formation age and petrogenesis of the Yangkang granites in the Qilian block remain controversial. In this study, LA-ICP-MS zircon U-Pb dating and whole-rock geochemical analysis were conducted to constrain the petrogenetic and tectonic processes during the formation of the granites. The results show that U-Pb age of granodiorite in Yangkang pluton is 444±1.2Ma, (MSWD=1.14), indicating that it was formed in the early Late Ordovician and that the rocks belong to weak peraluminous-strong peraluminous I-type granite.The rocks are enriched with large ion lithophile elements (K,Ba, Rb) and Light Rare Earth Elements (LREEs) and Th, but depleted in the high field strength elements (e.g., Ta-Nb). The above results show that Yangkang granites were derived from partial melting of continental crust. Combined with the regional data, the authors suggest that the Yangkang granites were probably formed in an active continental margin during Late Ordovician.
- late Ordovician /
- zircon U-Pb dating /
- rock geochemistry /
- Yangkang granite /
- south Qilian block

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References

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