Citation: | LI Liyang, ZHANG Chuanheng, HAN Yao, SHI Chenglong, LIU Bo, LIU Genyuan. 2023. Zircon U-Pb age and geological background of rhyolite from Baiyingaolao Formation in Wunuer area, Great Xing'an Range[J]. Geology in China, 50(5): 1532-1541. doi: 10.12029/gc20200229002 |
This paper is the result of geological survey engineering.
The Baiyingaolao Formation is an important part of the Mesozoic volcanic rocks in Great Xing'an Range, Northeastern China, and the geochronology and geochemistry characteristics of the Baiyingaolao Formation can provide basic geological data for the tectonic evolution of Great Xing'an Range.
In this paper, LA-ICP-MS zircon U-Pb age and geochemistry of the rhyolites in Baiyingaolao Formation from Wunuer area in Great Xing'an Range have been carried out.
The testing results indicate that the LA-ICP-MS zircon U-Pb crystallization age is (127.6 ±1.2Ma) Ma, which belongs to Early Cretaceous. The rhyolites belong to high-SiO2, high-K peraluminous, calcalkaline series. The rhyolites are enriched in Rb, Ba, K, depleted in Sr and Nb, P, Ti, and LREE is enriched and HREE is relatively depleted, with moderate Eu-rich anomaly (δEu=0.49~0.87).
Combined with regional geological characteristics, the tectonic setting of rhyolites in Baiyingaolao Formation from Wunuer area in Great Xing'an Range may be related to the subduction of Pacific plate.
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Simplified geological map of research area and sampling position
Field characteristics (a) and microscopical rhythm structure (b) of the rhyolites
Geochemical discrimination diagrams for rhyolites in Baiyingaolao Formation
The primitive mantle-normalized trace elements patterns (a) and the chondrite-normalized REE patterns (b) (normalization values after Sun and McDonough, 1989)
Zircon CL images of rhyolites in Baiyingaolao Formation
Zircon U-Pb concordia plot (a) and the weighted average age (b) of rhyolites in Baiyingaolao Formation
(logτ-logδ) diagram (a, after Rittmann, 1973) and Rb-(Y+Nb) diagram (b, after Pearce et al., 1984) for rhyolites in Baiyingaolao Formation