Geochronology, geochemistry and geological sig-nificance of the Early Cretaceous alkali feldspar granites in the Yilehuli Mountain, Da Hinggan, Mountain

YIN Zhigang; GONG Zhaomin; ZHANG Yuelong; HAN Yu; WANG Yang; CAO Zhongqiang; LI Haina; LI Min

2018 Vol. 37, No. 6

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YIN Zhigang, GONG Zhaomin, ZHANG Yuelong, HAN Yu, WANG Yang, CAO Zhongqiang, LI Haina, LI Min. Geochronology, geochemistry and geological sig-nificance of the Early Cretaceous alkali feldspar granites in the Yilehuli Mountain, Da Hinggan, Mountain[J]. Geological Bulletin of China, 2018, 37(6): 1061-1074.

Citation:

YIN Zhigang, GONG Zhaomin, ZHANG Yuelong, HAN Yu, WANG Yang, CAO Zhongqiang, LI Haina, LI Min. Geochronology, geochemistry and geological sig-nificance of the Early Cretaceous alkali feldspar granites in the Yilehuli Mountain, Da Hinggan, Mountain[J]. Geological Bulletin of China, 2018, 37(6): 1061-1074.

Geochronology, geochemistry and geological sig-nificance of the Early Cretaceous alkali feldspar granites in the Yilehuli Mountain, Da Hinggan, Mountain

1.
College of Mining Engineering/Liaoning Technical University, Fuxin 123000, Liaoning, China
2.
Qiqihar Branch, Heilongjiang Institute of Geological Survey, Harbin 150036, Heilongjiang, China

Received Date: 24 April 2017

Revised Date: 02 June 2017

Publish Date: 25 June 2018

Abstract

Abstract

Petrographic and geochemical data and LA-ICP-MS zircon U-Pb ages were obtained for Early Cretaceous alkali feldspar granites of the Yilehuli Mountain. The major elements of Yilehuli alkali feldspar granites are high in Si, ALK, and low in Mg, Ca. Trace elements are enriched in incompatible elements such as K, Rb and Th, and depleted in Sr, P, Eu and Ti. Geochemical features indicate that alkali feldspar granites are aluminum A-type granites (A/CNK=0.88~1.21, A/NK=0.94~1.49). LA-ICP-MS zircon U-Pb age data of coarse-medium alkali feldspar granites and fine-medium alkali feldspar granites are 140.3 ±1.0Ma and 137.9 ±0.8Ma, respectively, indicating that intrusive rocks were formed in Early Cretaceous. Combined with regional geological investiga-tion, the authors hold that the formation of Yilehuli plutons was closely related to lithospheric extension caused by closure of the Mongol-Okhotsk Ocean, and that the primary magma was derived from partial melting of crustal materials.
- Early Cretaceous /
- geochemistry /
- zircon U-Pb age /
- A-type granite /
- Yilehuli Mountain

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References

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