SHRIMP Geochronology and Hf Isotope of Zircons from Granitoids of the Weilasituo Deposit in Inner Mongolia

Geoscience ›› 2013, Vol. 27 ›› Issue (1): 67-78.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

SHRIMP Geochronology and Hf Isotope of Zircons from Granitoids of the Weilasituo Deposit in Inner Mongolia

WANG Xin-yu¹, HOU Qing-ye¹, WANG Jin², CHEN Yue-long¹, LIU Jin-bao³, WANG Zhong³，LI Da-peng¹

1School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;
2Liaoning Geological Survey for Chemical Industry, Jinzhou, Liaoning121000,China;
3Geological Survey of Inner Mongolia, Hohhot, Inner Mongolia010020, China

Received:2012-02-28 Revised:2012-07-23 Online:2013-01-16 Published:2013-01-17

Abstract

Abstract:

Weilasituo copper polymetallic deposit is located in the intersection of central Asia orogenic belt and Da Xinganling orogenic belt. The zircon SHRIMP U-Pb dating shows that granitoids ages are (298.0±2.5) Ma，(308.3±4.2) Ma，(313.9±3.4) Ma and (320.5±4.1) Ma，indicating that they formed in Late Carboniferous. Rock geochemistry characteristics shows that the granitoids are the product of magmatic arc activities. Except for the zircons of granodiorites samples with ε_Hf(t) values from -4.1 to+4.08, the zircon εHf(t) values of the other samples are positive, ranging from +0.4 to +9.9. The peak of zircon Hf model age is consistent with the time of Paleo-Asian Ocean development, suggesting that the main source material of granitoids in mining area is the subducted oceanic curst of the Paleo-Asian Ocean and some Precambrian crust. Systematic study on granitoids in mining area may provide the basic information for exploring the evolution of Xinganling-Mongolian orogenic belt in the Late Paleozoic and new evidence for the genesis of copper polymetallic deposit.

Key words: Weilasituo deposit, zircon, U-Pb age, Hf isotope, Inner Mongolia

CLC Number:

P588.12

WANG Xin-yu,HOU Qing-ye,WANG Jin,CHEN Yue-long,LIU Jin-bao,WANG Zhong,LI Da-peng. SHRIMP Geochronology and Hf Isotope of Zircons from Granitoids of the Weilasituo Deposit in Inner Mongolia[J]. Geoscience, 2013, 27(1): 67-78.

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SHRIMP Geochronology and Hf Isotope of Zircons from Granitoids of the Weilasituo Deposit in Inner Mongolia

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