Discovery and Geological Significance of Early Permian Mafic Dike Intrusive into Tuolai Paleo-proterozic Rockin Yulongtan Region

LIU Baoshan; CAI Jinfu; LEI Xiaoqing; WANG Taishan; MENG Hong

2016 Vol. 49, No. 4

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LIU Baoshan, CAI Jinfu, LEI Xiaoqing, WANG Taishan, MENG Hong. Discovery and Geological Significance of Early Permian Mafic Dike Intrusive into Tuolai Paleo-proterozic Rockin Yulongtan Region[J]. Northwestern Geology, 2016, 49(4): 43-50.

Citation:

Discovery and Geological Significance of Early Permian Mafic Dike Intrusive into Tuolai Paleo-proterozic Rockin Yulongtan Region

1.
Qinghai Institute of Geological Survey, Qinghai Province Key Laboratory of Geological Process and Mineral Resources of Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China
2.
Comprehensive Geological and Mineral Exploration Institute of Qinghai Province, Golmud 816000, Qinghai, China

Received Date: 10 January 2016

Revised Date: 14 July 2016

Publish Date: 15 December 2016

Abstract

Abstract

The Precambrian granite rock in Yulongtan region is composed ofmonzonitic granite, quartz syenite and yenogranite.The LA-MC-ICP-MA ages of this granite rockare (502.1+1.7)Ma and (492.7+1.9)Ma. This granite rocks show the geochemical characteristic of aluminum and potassium (K₂O>Na₂O), belonging to the calc-alkaline series.Tectonic environment discrimination shows that this granite rock was formed in the syn-collision tectonic environment.After comprehensively analyzing the related geological data, it is concluded that the Cambrian granite should be formed in the expansion phase of the basin in the south, and caused by the melting of the continental crust in the north when the Langshidang micro block was subjected to extrusion.
- Northern Qilian /
- Cambrian /
- granite /
- geochemistry

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