Formation of a DMM-EM2 Mixing Trend in Continental Intraplate Basalts by Variable Degrees of Melting of Hybrid Mantle Controlled by the Lithospheric Lid

Xun Yu; Gang Zeng; Xiao-Jun Wang; Fa-Jun Sun; Hui-Li Zhang

doi:10.1007/s12583-022-1782-2

Volume 36 Issue 5

Oct 2025

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Journal of Earth Science > 2025 > 36(5): 2179-2192.

Xun Yu, Gang Zeng, Xiao-Jun Wang, Fa-Jun Sun, Hui-Li Zhang. Formation of a DMM-EM2 Mixing Trend in Continental Intraplate Basalts by Variable Degrees of Melting of Hybrid Mantle Controlled by the Lithospheric Lid. Journal of Earth Science, 2025, 36(5): 2179-2192. doi: 10.1007/s12583-022-1782-2

Citation:

Xun Yu, Gang Zeng, Xiao-Jun Wang, Fa-Jun Sun, Hui-Li Zhang. Formation of a DMM-EM2 Mixing Trend in Continental Intraplate Basalts by Variable Degrees of Melting of Hybrid Mantle Controlled by the Lithospheric Lid. Journal of Earth Science, 2025, 36(5): 2179-2192. doi: 10.1007/s12583-022-1782-2

Citation:

Xun Yu, Gang Zeng, Xiao-Jun Wang, Fa-Jun Sun, Hui-Li Zhang. Formation of a DMM-EM2 Mixing Trend in Continental Intraplate Basalts by Variable Degrees of Melting of Hybrid Mantle Controlled by the Lithospheric Lid. Journal of Earth Science, 2025, 36(5): 2179-2192. doi: 10.1007/s12583-022-1782-2

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Formation of a DMM-EM2 Mixing Trend in Continental Intraplate Basalts by Variable Degrees of Melting of Hybrid Mantle Controlled by the Lithospheric Lid

doi: 10.1007/s12583-022-1782-2

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
State Key Laboratory of Critical Earth Material Cycling and Mineral Deposits, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
3.
State Key Laboratory of Continental Evolution and Early Life, Department of Geology, Northwest University, Xi'an 710069, China
4.
Department of Environmental Science and Technology, University of Maryland, College Park MD 20742, USA

More Information

Corresponding author: Xun Yu, yuxun@tongji.edu.cn
Received Date: 22 May 2022
Accepted Date: 21 Nov 2022

Available Online: 14 Oct 2025

Issue Publish Date: 30 Oct 2025

Abstract

Abstract

Continental intraplate basalts form by partial melting of the mantle, and can provide important constraints on mantle heterogeneity. However, due to the thick overlying continental lithosphere, the origins of the geochemical characteristics of continental intraplate basalts are controversial. In this study, we examined the geochemistry of Cenozoic basalts in southeast China. These basalts which are divided into four volcanic belts exhibit a DMM-EM2 mixing trend and spatial variations in Pb isotopes from inland (i.e., thick lithosphere) to coastal (i.e., thin lithosphere) regions. In contrast to the Pb isotopic variations, there are no spatial variations in Sr-Nd-Hf isotopes. Marked correlations between Pb isotopes and major elements (i.e., MgO and SiO₂) suggest the continental lithospheric lid controlled their petrogenesis. Nonetheless, other factors are needed to explain the variations in Ti/Ti* and Hf/Hf* ratios, and Nd-Hf isotopes of the southeast China basalts. The increasing Pb isotope ratios from the inner to coastal regions are associated with decreases in CaO/Al₂O₃ ratios and increases in FC3MS (FeO^T/CaO–3 × MgO/SiO₂; in wt.%) values, indicating contributions from non-peridotite components in the mantle sources. The similarly depleted Nd-Hf isotopic compositions of the basalts from the three inner belts indicate these basalts have a similar origin, whereas the more enriched isotopic features of the basalts from the outer belt suggest their mantle source contains older recycled oceanic crust. Thus, source (i.e., lithological) heterogeneity also had a significant role in controlling the geochemistry of these basalts. The DMM-EM2 mixing trend defined by the Pb isotopic compositions of continental intraplate basalts from southeast China was generated by variable degrees of melting of heterogeneous mantle that was controlled by the thickness of the continental lithospheric lid (i.e., the melting pressure). This caused variable extents of melting of enriched components in the mantle sources of the basalts (i.e., carbonated peridotite vs. pyroxenite).
- continental intraplate basalt,
- enriched mantle 2 (EM2),
- Pb isotopes,
- carbonated mantle,
- melting behavior,
- geochemistry,
- petrology

Electronic Supplementary Materials: Supplementary materials (Figures S1–S3; Tables S1–S4) are available in the online version of this article at https://doi.org/10.1007/s12583-022-1782-2.
Conflict of Interest
The authors declare that they have no conflict of interest.

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