Metasomatism of the crust-mantle boundary by melts derived from subducted sedimentary carbonates and silicates

Hu, Jun; Jiang, Neng; Carlson, Richard W.; Guo, Jinghui; Fan, Wenbo; Huang, Fang; Zhang, Shuangquan; Zong, Keqing; Li, Tiejun; Yu, Haiying

doi:10.1016/j.gca.2019.06.033

Cited by 21 publications

(33 citation statements)

References 74 publications

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“…Therefore, the light Zn isotopic compositions of continental margin sediments can potentially overprint the heavy isotopic compositions of carbonates, which is a possible mechanism for the Mg-Zn isotopic decoupling in the mantle sources of clinopyroxenites (δ 26 Mg: −1.53‰-−1.04‰; J. Hu et al, 2019;δ 66 Zn: <0.04‰ in this study).…”

Section: Mantle Source Heterogeneity and Later-stage Melt/fluid Metas...mentioning

confidence: 82%

“…The Hannuoba pure‐ and phl‐clinopyroxenites also have constantly low δ 26 Mg (−1.04‰–−1.51‰) and high δ 18 O values (9.9‰–11.3‰) (J. Hu et al., 2019; Y. Hu et al., 2016; X. Zhao et al., 2017). Also, continental crust‐derived Precambrian zircons have been found in clinopyroxenite xenoliths (J. Hu et al., 2019 and this study). The geochemical evidence of clinopyroxenites indicates the involvement of recycled Mg‐rich carbonates (J. Hu et al., 2019; Y. Hu et al., 2016) and ancient continental crust components in their mantle source.…”

Section: Discussionmentioning

confidence: 99%

“…The Hannuoba pure-and phl-clinopyroxenites also have constantly low δ 26 Mg (−1.04‰-−1.51‰) and high δ 18 O values (9.9‰-11.3‰) (J. Hu et al, 2019;X. Zhao et al, 2017).…”

Section: Recycled Upper Continental Crust Components In Mantle Source...mentioning

confidence: 99%

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Tracing Sediment Melt Activity in the Sub‐Continental Lithosphere: Insights From Zn‐Fe Stable Isotopes

Zhang

Liu

et al. 2023

JGR Solid Earth

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Recycling of upper crustal sediments through slab subduction contributes to sub‐continental lithospheric refertilization and heterogeneity. However, the nature of recycled upper crustal components is unclear and direct evidence for sediment melt activity in the sub‐continental lithosphere is lacking. Here, we integrate major and trace elements, zircon U‐Pb dating, Sr‐Nd‐Zn‐Fe isotopic compositions of clinopyroxenites (crust‐mantle boundary) and a “glassy” xenolith from the North China Craton to relate their petrogenesis to the potential recycling of upper continental crust and provide direct insight into the sediment melt‐rock interaction. The clinopyroxenites have relatively uniform δ56Fe values (the permil deviation of the 56Fe/54Fe ratio from the IRMM014; −0.05‰–0.07‰, except for one outlier) and are not affected by melt metasomatism. The clinopyroxenites have highly variable whole‐rock δ66Zn values (the permil deviation of the 66Zn/64Zn ratio from the JMC‐Lyon standard) between 0.04‰ and 0.46‰, that closely correlate with Rb/La, K/U, Ba/Th, and Th/Nb ratios, and generate arrays that trend toward a composition similar to the “glassy” xenolith. The “glassy” xenolith has a high δ66Zn value (0.43‰ ± 0.05‰, 2SD) and a significantly low 143Nd/144Nd ratio (0.510991). This evidence implies that the “glassy” xenolith may represent a quenched sediment melt formed by the melting of carbonate‐bearing terrigenous sediments that may also be responsible for the metasomatism of clinopyroxenite xenoliths. The geochemical evidence from the “glassy” and clinopyroxenite xenoliths provides a direct evidence for the activity of sediment melt with upper continental crust components in the sub‐continental lithosphere.

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Section: Mantle Source Heterogeneity and Later-stage Melt/fluid Metas...mentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Tracing Sediment Melt Activity in the Sub‐Continental Lithosphere: Insights From Zn‐Fe Stable Isotopes

Zhang

Liu

et al. 2023

JGR Solid Earth

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“…Although mantle‐like δ 18 O values in melts do not necessarily imply that these melts originated from the mantle (Bindeman et al, 2005), carbonatite melts derived from subducted slabs much likely have high δ 18 O values (e.g., Miller et al, 2001). Such example is presented by clinopyroxenite xenoliths from Hannuoba in the northern NCC, which have remarkably high whole rock δ 18 O values (9.9–11.3‰; Hu et al, 2019). These xenoliths are results of reactions between mantle peridotite and melts derived from subducted slab.…”

Section: Discussionmentioning

confidence: 99%

Mantle and Recycled Oceanic Crustal Components in Mantle Xenoliths From Northeastern China and their Mantle Sources

Guo

Ionov

et al. 2020

JGR Solid Earth

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The subduction of the Paleo-Pacific plate is widely credited for the destruction of the eastern North China Craton. However, how the Pacific plate subduction has affected the off-craton lithospheric mantle in northeastern China is less clear, as few studies have focused on the lithospheric mantle-derived xenoliths in that region. We report petrography, mineral and rock chemistry, and in situ isotopic compositions of Sr in clinopyroxene and O in olivine for 20 peridotite and 11 pyroxenite xenoliths hosted by the Cenozoic volcanic rocks at Jiaohe and Shuangliao localities. The peridotites include lherzolites, harzburgites, and a wehrlite, many are metasomatized. Group 1 garnet pyroxenites have high Al 2 O 3 , Ni, and Mg#; positive Eu and Sr anomalies; and olivine δ 18 O values of 4.8-5.1‰, which we attribute to recycling of oceanic crustal components to the asthenosphere and their reactions with host peridotites. Groups 2 and 3 pyroxenites are garnet-free and contain peridotite-like pyroxenes; we argue that they were formed by reactions of lithospheric peridotites with evolved melts derived from recycled oceanic crust. In addition, one pyroxenite contains orthopyroxene surrounded by fine-grained olivine and clinopyroxene, while another pyroxenite and the wehrlite contain zoned clinopyroxene with gradual increases in Na 2 O, (La/Yb) N , Sr, and 87 Sr/ 86 Sr ratios and decreases in Ti/Eu from core to rim. These characteristics record infiltration of a carbonatite melt shortly before the transport of the xenoliths. The inferred carbonatite melt has 87 Sr/ 86 Sr ≥ 0.70415 and mantle-like olivine δ 18 O and originated from carbonated asthenosphere. Our results, together with previous studies on the host basalts, suggest that subducted crustal materials were initially transported to the asthenosphere beneath northeastern China to produce carbonate-bearing domains. Upwelling of the carbonated asthenosphere produced carbonatite melts that migrated upward and metasomatized the overlying lithospheric mantle.

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“… Compilation of available (a) Mg isotopic and (b, c, d) chemical data for mantle xenoliths hosted by Paleozoic diamond-bearing kimberlites and Mesozoic mafic igneous rocks in the NCC. Data for mantle xenoliths hosted by Cenozoic basalts (Hannuoba, Maowu, Beiyan) and Mesozoic intrusion (Jiagou) [ 28 , 34 , 35 , 57 , 58 ] are also shown (see text for details). Experimental data for carbonate melt–peridotite interaction are from ref.…”

Section: Additional Carbon From Recycled Carbonatesmentioning

confidence: 99%

Linking deep CO2 outgassing to cratonic destruction

Wang

Liu

et al. 2022

National Science Review

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Outgassing of carbon dioxide from the Earth's interior regulates the surface climate through deep time. Here we examine the role of cratonic destruction in mantle CO2 outgassing via collating and presenting new data for Paleozoic kimberlites, Mesozoic basaltic rocks and their mantle xenoliths from the eastern North China Craton (NCC) which underwent extensive destruction in the early Cretaceous. High Ca/Al and low Ti/Eu and δ26Mg are widely observed in lamprophyres and mantle xenoliths, which demonstrates that the cratonic lithospheric mantle (CLM) was pervasively metasomatized by recycled carbonates. Raman analysis of bubble-bearing melt inclusions shows that redox melting of the C-rich CLM produced carbonated silicate melts with high CO2 contents. The enormous quantities of CO2 in these magmas, together with subtantial CO2 degassing from carbonated melt-CLM reaction and crustal heating, indicate that destruction of the eastern NCC resulted in rapid and extensive mantle CO2 emission, which partly contributed to the early Cretaceous greenhouse climate episode.

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Metasomatism of the crust-mantle boundary by melts derived from subducted sedimentary carbonates and silicates

Cited by 21 publications

References 74 publications

Tracing Sediment Melt Activity in the Sub‐Continental Lithosphere: Insights From Zn‐Fe Stable Isotopes

Tracing Sediment Melt Activity in the Sub‐Continental Lithosphere: Insights From Zn‐Fe Stable Isotopes

Mantle and Recycled Oceanic Crustal Components in Mantle Xenoliths From Northeastern China and their Mantle Sources

Linking deep CO2 outgassing to cratonic destruction

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