Contrasting fates of subducting carbon related to different oceanic slabs in East Asia

Liu, Sheng‐Ao; Wu, Tianhao; Li, Shuguang; Wang, Zhaoxue; Liu, Jingao

doi:10.1016/j.gca.2022.03.009

Cited by 17 publications

(10 citation statements)

References 97 publications

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“…However, our samples with lower-than-MORB δ 65 Cu values cannot be explained by either sulfide segregation of a sulfide-saturated magma with normal (MORB-like) δ 65 Cu value or partial melting of a normal peridotite source. As discussed above, a binary mixing between recycled carbonates and the mantle is also unlikely to substantially modify the Cu isotopic compositions of the mantle (Figure 7a; Liu, Wu, et al, 2022;Meyer et al, 2012;Zhang et al, 2022).…”

Section: Cu Isotopic Evidence For Oxidation-enhanced Sulfide Dissolutionmentioning

confidence: 88%

“…Since carbonates and siliciclastic sediments have contrasting Mg and Zn isotopic signatures (Liu, Qu, et al., 2022), recycled carbonate is the most conceivable candidate for generating the hybridized mantle sources. Marine carbonates have lower δ 26 Mg (mostly between −5.6‰ and −0.4‰; Teng, 2017) and higher δ 66 Zn (0.99‰ ± 0.24‰; e.g., Liu et al., 2017; Pichat et al., 2003; Sweere et al., 2018) values than those of the mantle (δ 26 Mg = −0.25‰ ± 0.04‰; Teng, 2017; δ 66 Zn = 0.18‰ ± 0.05‰; Sossi et al., 2018; Z.‐Z.…”

Section: Discussionmentioning

confidence: 99%

“…Li et al., 2021; S.‐G. Li et al., 2017; Liu, Qu, et al., 2022). The lithology of these basalts is mainly alkaline with minor subalkaline formed by various degrees of mantle partial melting (Figure 2; Yu et al., 2018).…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

“…Carbon subduction is thought to be more efficient than H 2 O on the modern Earth linked to the inventory and the stability of carbonates in subducted slabs increases with depths (Dasgupta & Hirschmann, 2010; Pan et al., 2013). If the initially subducted carbonates are sufficiently abundant, a substantial part of them can survive in the arc regime and penetrate the deeper mantle, at least in the mantle transition zone (MTZ; ∼440–660 km; Liu, Qu, et al., 2022; Mazza et al., 2019; Plank & Manning, 2019). At depths of >∼300 km, the subducted carbonate‐bearing oceanic slab would undergo melting to produce carbonatitic melts (Thomson et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Li et al., 2021; S.‐G. Li et al., 2017; Liu, Qu, et al., 2022). Thus, these basalts are ideal samples to explore the possible linkage between deep mantle oxidation and recycled crustal components on a large scale.…”

Section: Introductionmentioning

confidence: 99%

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Mantle Oxidation Induced by Recycled Carbonate: Insights From Mg‐Zn‐Fe‐Cu Isotopic Systematics of Intraplate Basalts

Wu,

Liu

2023

JGR Solid Earth

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Mantle oxidation plays an essential role in volatile cycling between Earth’s interior and exterior. However, the conceivable oxidizer remains enigmatic and needs to be explored by geochemical tools. Here, we examine the potential of recycled carbonates in inducing redox changes of the deep mantle through combined isotopic studies of Mg (δ26Mg), Zn (δ66Zn), Fe (δ56Fe), and Cu (δ65Cu) on a suite of intraplate alkaline basalts proposed to have originated from the mantle transition zone (∼440–660 km). Compared with mid‐ocean ridge basalts (MORB), these basalts have variably lower δ26Mg and higher δ66Zn, the typical features of marine carbonates, indicating the presence of various amounts of deeply recycled carbonates in their sources. As the estimated amounts of recycled carbonates in sources increase (i.e., lower δ26Mg and higher δ66Zn), the basalts have higher δ56Fe and lower δ65Cu compared with MORB. These correlations cannot be explained alone by binary mixing between recycled carbonates and the pristine mantle because of the much lower Fe and Cu contents of marine carbonates than those of the mantle and instead require redox‐driven isotope fractionation induced by mantle carbonate metasomatism. During partial melting of an oxidized mantle source, isotopically heavy ferric iron and isotopically light sulfide were preferentially incorporated/dissolved into the melts that are enriched in heavy Fe and light Cu isotopes. These observations highlight that recycled carbonates serve as an important oxidizer for the deep mantle and facilitate the extraction of mantle sulfides, which can be effectively tracked by Fe and Cu isotopic systematics of intraplate basalts.

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Section: Cu Isotopic Evidence For Oxidation-enhanced Sulfide Dissolutionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mantle Oxidation Induced by Recycled Carbonate: Insights From Mg‐Zn‐Fe‐Cu Isotopic Systematics of Intraplate Basalts

Wu,

Liu

2023

JGR Solid Earth

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Phantom recycled carbonates and mantle pyroxenites: insight from the low-δ26Mg intraplate basaltic province across central-eastern Asia

Dai

Zheng

Xiong

et al. 2022

Preprint

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Mass recycling from subduction to magmatic extrusion shapes our habitable environment and Earth's interior. Subducted igneous crust may form pyroxenites before participating magmatism, but the deep journey of associated carbonates remains unclear. Here we report new Mg-isotope data for ˜89 to 81 Ma basaltic rocks in Langshan area, central Asia (δ 26 Mg = -0.391 to -0.513 synthesis for post-110 Ma basalts across eastern Asian continent. The merged low-δ 26 Mg basaltic province normally interpreted as derivations from carbonated sources paradoxically displays geochemical signatures (low Ca/Al and high K 2 O contents) resembling partial melts of uncarbonated sources. Negative correlations of δ 26 Mg vs TiO 2 and FCKANTMS, the proxy of pyroxenitic melts, and adiabatic melting modeling suggest presence of Mg-isotopically light source pyroxenites transformed from decarbonated altered oceanic crust. This may explain ubiquitous pyroxenitic contributions in many low-δ 26 Mg basaltic suites and has significant implication for deep carbon cycling. Hosted fileessoar.10512814.1.docx available at https://authorea.com/users/563886/articles/610974phantom-recycled-carbonates-and-mantle-pyroxenites-insight-from-the-low-%CE%B426mgintraplate-basaltic-province-across-central-eastern-asia Phantom recycled carbonates and mantle pyroxenites: insight from the low-26 Mg intraplate basaltic province across central-eastern Asia

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Zinc isotopes reveal disparate enriched sources of contemporary lamprophyres in Eastern Dharwar Craton

Liu,

Chen,

Wang

et al. 2023

Contrib Mineral Petrol

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Contrasting fates of subducting carbon related to different oceanic slabs in East Asia

Cited by 17 publications

References 97 publications

Mantle Oxidation Induced by Recycled Carbonate: Insights From Mg‐Zn‐Fe‐Cu Isotopic Systematics of Intraplate Basalts

Mantle Oxidation Induced by Recycled Carbonate: Insights From Mg‐Zn‐Fe‐Cu Isotopic Systematics of Intraplate Basalts

Phantom recycled carbonates and mantle pyroxenites: insight from the low-δ26Mg intraplate basaltic province across central-eastern Asia

Zinc isotopes reveal disparate enriched sources of contemporary lamprophyres in Eastern Dharwar Craton

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