Olivine and melt inclusion chemical constraints on the nature and origin of the common mantle component beneath eastern Asia

Liu, Jian-Qiang; Chen, Li-Hui; Wang, Xiaojun; Zhang, Huili; Zeng, Gang; Erdmann, Saskia; Zhang, Le; Ren, Zhong‐Yuan

doi:10.1007/s00410-022-01981-y

Cited by 3 publications

(3 citation statements)

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“…Furthermore, it has been inferred that the mantle source beneath the XMOB is relatively oxidized (ΔFMQ up to 2.9, J.‐Q. Liu et al., 2022), which is not an ideal condition for sulfide stability; therefore, the presence of residual sulfides in the mantle source of the CBs is unlikely. It is inferred that the effect of sulfides on the Mo composition of the CBs during magmatic fractionation and partial melting of the mantle was negligible.…”

Section: Discussionmentioning

confidence: 99%

“…Radiogenic isotopic data (Sr–Nd–Hf–Pb) from late Cenozoic OIB‐like basalts have been used in previous studies to suggest that the depleted end‐member in the mantle source of the late Cenozoic basalts in NE China could be DMM, FOZO, or ancient primordial mantle (Y. Chen et al., 2007; Kuritani et al., 2011; J.‐Q. Liu et al., 2022; Xu et al., 2018; Xue et al., 2019; H. Zou et al., 2000). However, discriminating between DMM, FOZO, and ancient primordial mantle using radiogenic isotopes (e.g., Sr–Nd–Hf) alone is often problematic because these mantle reservoirs could all have depleted Sr–Nd–Hf isotopic compositions (e.g., Jackson & Jellinek, 2013; White, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…For example, it has been proposed that the depleted end‐member in the mantle source of late Cenozoic OIB‐like basalts in NE China is depleted MORB mantle (DMM, Kuritani et al., 2011; Xu et al., 2018; H. Zou et al., 2000), FOZO (Y. Chen et al., 2007; J.‐Q. Liu et al., 2022), or ancient primordial mantle (Xue et al., 2019), whereas it has been suggested that the enriched end‐member is continental lithospheric mantle veined by hornblendite (Guo et al., 2016, 2020; Yu et al., 2018) or recycled oceanic crust with or without sediments (H. Chen et al., 2017; Choi et al., 2017; Kuritani et al., 2011; Lei, Guo, Sun, et al., 2020; Lei, Guo, Zhao, et al., 2020; X.‐C. Wang et al., 2015; M. Zhang & Guo, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Origin of Late Cenozoic Basaltic Magmatism in Inner Mongolia, NE China: Constraints From Sr–Nd–Hf–Pb–Mo–He Isotopes

Lei,

Chen,

Zhang

2023

Geochem Geophys Geosyst

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This paper presents a study of the late Cenozoic Chifeng basalts (CBs) of NE China, including their olivine He isotopic compositions, whole‐rock major‐ and trace‐element contents, and whole‐rock Sr–Nd–Hf–Pb–Mo isotopic compositions, with the aim of constraining their mantle source. Results show that the basalts have high MgO, low CaO contents, and high FeOT/MnO values, which indicate that their mantle lithology was most likely pyroxenite. The CBs also exhibit ocean‐island‐basalt‐like trace‐element patterns (e.g., enrichment in light rare earth elements and high‐field‐strength elements) and have depleted Sr–Nd–Hf and relatively radiogenic Pb isotopic compositions, requiring both depleted and enriched components in their mantle. The low olivine He (3He/4He = 0.8–5.5 Ra) and whole‐rock Mo (δ98/95Mo = −0.71‰ to −0.18‰) isotopic values of the CBs, together with geophysical evidence, indicate that the rocks were derived from a depleted MORB mantle (DMM) enriched by recycled oceanic crust that was sourced from the mantle transition zone (MTZ). During the late Cenozoic, ascending wet mantle plumes triggered by dehydration of a stagnant Pacific oceanic slab are inferred to have transported preexisting recycled Pacific oceanic crust from the MTZ into the overlying asthenosphere mantle. The upwelling Pacific oceanic crust reacted with asthenospheric mantle peridotite (i.e., DMM) to produce mantle pyroxenite, whose partial melting at shallow depths generated the CBs. Considering the low δ98/95Mo values of both the CBs and coeval potassic basalts from NE China, we speculate that there may be a low δ98/95Mo reservoir in the MTZ beneath NE China.

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Section: Discussionmentioning

confidence: 99%