Zircon U-Pb dating and tectonic significance of Shichang-shan pluton in central Da Hinggan Mountains

SONG Weimin; PANG Xuejiao; NA Fuchao; TAO Nan; LIU Yingcai; FU Junyu; TAN Hongyan

2018 Vol. 37, No. 9

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SONG Weimin, PANG Xuejiao, NA Fuchao, TAO Nan, LIU Yingcai, FU Junyu, TAN Hongyan. Zircon U-Pb dating and tectonic significance of Shichang-shan pluton in central Da Hinggan Mountains[J]. Geological Bulletin of China, 2018, 37(9): 1736-1747.

Citation:

SONG Weimin, PANG Xuejiao, NA Fuchao, TAO Nan, LIU Yingcai, FU Junyu, TAN Hongyan. Zircon U-Pb dating and tectonic significance of Shichang-shan pluton in central Da Hinggan Mountains[J]. Geological Bulletin of China, 2018, 37(9): 1736-1747.

Zircon U-Pb dating and tectonic significance of Shichang-shan pluton in central Da Hinggan Mountains

1.
Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China
2.
Eastern Continental Margin Research Center, China Geological Survey, Shenyang 110034, Liaoning, China
3.
College of Resources and Civil Engineering, Northeast University, Shenyang 110819, Liaoning, China

More Information

Corresponding author: NA Fuchao, 350413595@qq.com

Received Date: 20 March 2018

Revised Date: 10 August 2018

Publish Date: 15 September 2018

Abstract

Abstract

In this paper, the authors conducted geochronologic and geochemical studies of the Shichangshan pluton in central Da Hinggan Mountains. Zircon U-Pb dating demonstrates that the weighted mean ²⁰⁶Pb/²³⁸U ages for the zircons from the monzonitic granite are 201.69±0.72Ma (MSWD=0.04) and 202.09 ±0.69Ma (MSWD=0.12), suggesting late Triassic emplacement. Petrology and geochemistry show that it is of the alkaline and peraluminous series. The monzonitic granite is characterized by high SiO₂ (73.77~77.69), high alkali (Na₂O+K₂O=6.7%~8.81%), high TFeO/MgO (7.24~45.57, 15.87 on average), low CaO (0.13%~1.01%), low MgO (0.08%~0.32%) and TiO2 (0.08%~0.31%). The monzonitic granite is characterized by a "sea-gull" REE pattern, significant negative Eu anomaly (δEu=0.04~0.61, 0.23 on average), depletion of Sr (18.31×10^-6~67.91×10^-6), Ba(50.07×10^-6~265.5×10^-6) and enrichment of Yb (5.09×10^-6~17.33×10^-6), Zr (91.34×10^-6~192.26×10^-6) and Y(35.44×10^-6~113.07×10^-6), suggesting that it is A-type granite. The high Rb/Sr ratios (ranging from 3.92 to 21.69, 10.14 on average) and Rb/Nb ratios (ranging from 13.9 to 54.8, 22.1 on average) of the rock indicate a crustal origin. A comprehensive analysis shows that the monzonitic granite was formed by low pressure felsic crust partial melting. In Na₂O-K₂O diagrams, it belongs to A-type granite. The Rb-(Y+Nb), Rb-(Yb+Ta), Nb-YCe diagrams in combination with regional tectonic evolution suggest that the monzonitic granite was formed in a post-orogenic setting.
- Central Da Hinggan Mountains /
- Shichangshan pluton /
- zircon U-Pb dating /
- geochemistry

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