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Open Access

Zircon U-Pb geochronology, geochemistry and tectonic implication of volcanic rocks from Manketouebo Formation in Keyihe area of northern Great Xing'an Range

Jinfeng JIA1, Yang WANG2, Pengchuan LI1,3( )
College of Earth Sciences, Jilin University, Changchun 130061, China
Jinan Municipal Engineering Construction Group, Jinan 250000, China
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China
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Abstract

Zircon U-Pb isotope dating and whole-rock geochemical analyses were undertaken for the rhyolite, rhyolitic lithic crystal tuff and dacitic tuff from the Manketouebo Formation in the Keyihe area, in order to constrain their genesis and tectonic significance. Zircon LA-ICP-MS U-Pb data indicate that the rhyolite and rhyolitic lithic crystal tuff were formed during 137±5 Ma and 143±1 Ma，respectively. These volcanic rocks have high SiO2 (70.03%–76.46%) and K2O+Na2O (8.10%–9.52%) contents, but low CaO (0.03%–0.95%) and MgO (0.07%–0.67%) contents, which belong to the peraluminous and high-K calc-alkaline rocks. They are enriched in light rare earth elements (REEs), and exhibit fractionation of light over heavy REEs, with δEu values of 0.37–0.83. The volcanic rocks are enriched in LILEs (e.g., Rb, U and K) and depleted in HFSEs (e.g., Nb, Ti, P and Ta). The chemical composition suggests that these volcanic rocks formed by partial melting of crust material. Combined with previous regional research results, the authors consider that the volcanic rocks of the Manketouebo Formation in the Keyihe area were formed under an extensional environment related to the closure of the Mongolia–Okhotsk Ocean.

Keywords

geochemistryManketouebo Formationzircon U-Pb geochronologyGreat Xing’an Range

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Global Geology
Volume 26 Issue 3,
August 2023
Pages 133-145
DOI: 10.3969/j.issn.1673-9736.2023.03.01
Cite this article:
JIA J, WANG Y, LI P. Zircon U-Pb geochronology, geochemistry and tectonic implication of volcanic rocks from Manketouebo Formation in Keyihe area of northern Great Xing'an Range. Global Geology, 2023, 26(3): 133-145. https://doi.org/10.3969/j.issn.1673-9736.2023.03.01

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Received: 15 February 2023
Accepted: 09 March 2023
Published: 25 August 2023
© 2023 GLOBAL GEOLOGY
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