International Journal of Earth Sciences and Engineering

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Zircon Lu-Hf Isotope of Granite in the Bianjiadayuan Pb-Zn-Ag Deposit, Inner Mongolia with Petrogenetic Implications


Affiliations
1 Geologic Survey, China University of Geosciences, Wuhan-430074, China
2 China University of Geosciences, Wuhan-430074, China
 

Series of late Mesozoic A-type granite and related polymetallic deposits located in the Southern Great Xing'an Range, NE China. The Bianjiadayuan Pb-Zn-Ag deposit serves a typical example and consists of quartz-sulfide vein-type mineralization within extensional faults related to granite. In situ LA-ICP-MS Hf isotopic analysis was conducted on zircons from ore-related granite. The zircons are characterized by εHf(t) of +2.3-+4.9 with average of +3.08 and TDM2 of 788-952 Ma, indicating that the granite was derived from a juvenile crust that originated from depleted mantle and contaminated by some ancient continental crust. In term of mineralization,contamination with crust may play an important role in formation of the deposit.

Keywords

Lu-Hf Isotope, Zircon, A-Type Granite, Petrogenesis, Bianjiadayuan, NE China.
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  • Zircon Lu-Hf Isotope of Granite in the Bianjiadayuan Pb-Zn-Ag Deposit, Inner Mongolia with Petrogenetic Implications

Abstract Views: 157  |  PDF Views: 131

Authors

Ruan Banxiao
Geologic Survey, China University of Geosciences, Wuhan-430074, China
Lv Xinbiao
Geologic Survey, China University of Geosciences, Wuhan-430074, China
Wu Chunming
Geologic Survey, China University of Geosciences, Wuhan-430074, China
Yu Yingmin
China University of Geosciences, Wuhan-430074, China

Abstract


Series of late Mesozoic A-type granite and related polymetallic deposits located in the Southern Great Xing'an Range, NE China. The Bianjiadayuan Pb-Zn-Ag deposit serves a typical example and consists of quartz-sulfide vein-type mineralization within extensional faults related to granite. In situ LA-ICP-MS Hf isotopic analysis was conducted on zircons from ore-related granite. The zircons are characterized by εHf(t) of +2.3-+4.9 with average of +3.08 and TDM2 of 788-952 Ma, indicating that the granite was derived from a juvenile crust that originated from depleted mantle and contaminated by some ancient continental crust. In term of mineralization,contamination with crust may play an important role in formation of the deposit.

Keywords


Lu-Hf Isotope, Zircon, A-Type Granite, Petrogenesis, Bianjiadayuan, NE China.