Melting of subducted slab dictates trace element recycling in global arcs

Li, Huijuan; Hermann, Jörg; Zhang, Lifei

doi:10.1126/sciadv.abh2166

Cited by 29 publications

(16 citation statements)

References 56 publications

(173 reference statements)

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“…The relative role of AOC-derived fluids plus sediment-derived melt, as well as serpentinite-derived fluid, and diapiric solid mélange in transporting slab materials to the arc magma sources to accomplish crustal recycling in subduction zones, has been a heated debate recently (e.g., Chen et al, 2021;Codillo et al, 2018;Cruz-Uribe et al, 2018;Li, H. et al, 2022;Nielsen and Marschall, 2017;Parolari et al, 2021;Turner and Langmuir, 2022).…”

Section: Implications On Processes Of Subduction Zone Crustal Recyclingmentioning

confidence: 99%

“…Although mainly based on a new round of numerical modeling (e.g., Behn et al, 2011;Marschall and Schumacher, 2012), an increasing number of geochemical and experimental studies argue that mélange models have advantages over the traditional fluid/melt fluxed models in explaining not only the major-trace elements, but also radiogenic isotope as well as nontraditional stable isotope (e.g., Mg) compositions of individual arc rocks or global arc rocks in general (e.g., Hao et al, 2022;Codillo et al, 2018;Cruz-Uribe et al, 2018;Nielsen and Marschall, 2017;Parolari et al, 2021). On the other hand, considering that this model intrinsically demands the low-pressure-high-temperature melting conditions for the oceanic crust including sediments in the mélange or mélange-peridotite mixtures, and physical mixing of sediments and oceanic crust with the mantle would significantly dilute the concentration of key elements such as Ti and Zr in the mixtures, whether sufficient quantities of key accessory minerals such as rutile and zircon will continue to stabilize during mélange melting to produce the unique trace element geochemical characteristics of arc rocks was severely questioned (e.g., Li et al, 2022;Pirard and Hermann, 2015;Turner and Langmuir, 2022).…”

Section: Implications On Processes Of Subduction Zone Crustal Recyclingmentioning

confidence: 99%

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Mg-Fe isotopes trace the mechanism of crustal recycling and arc magmatic processes in the Neo-Tethys subduction zone

Chen

Deng

et al. 2023

Preprint

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The mechanism of crustal recycling in subduction zones has been a heated debate, and Mg–Fe isotopes may provide new constraints for this debate. This study reported the Fe–Mg isotope data for mafic plutonic rocks from the eastern and central Gangdese arc and their associated trench sediments in southern Tibet. The δ26Mg (–0.32 to –0.20‰) and δ56Fe (0.04 to 0.12‰) values of the eastern Gangdese arc rocks show negative and positive correlations with (87Sr/86Sr)i and (206Pb/204Pb)i values, but positive and negative correlations with εNd(t) and εHf(t) values, respectively. The Mg and Fe isotopic compositions (δ26Mg = –0.28 to –0.15‰; δ56Fe = 0.02 to 0.12‰) of the central Gangdese arc rocks are comparable with the eastern ones, but they are not covariant with Sr–Pb–Nd–Hf isotopes. More importantly, the Fe–Mg isotopes for most of the arc rocks fall in between local trench sediments (δ26Mg = –0.61 to –0.30‰; δ56Fe = 0.00 to 0.17‰) and the normal mantle. Integrated qualitative analyses and quantitative simulations suggest that while the Mg–Fe isotope variations in the eastern Gangdese arc rocks revealed the important role of source mixing between sediment-derived melts and peridotite, their variations in the central Gangdese arc rocks reflected the controlling effects of source mixing between carbonated serpentinite-derived Mg-rich fluid and peridotite and source melting. The good covariant relationships between Mg–Fe isotope and traditional geochemical tracers provide further evidence for the recycling of crustal materials in subduction zones via various types of slab-derived fluids and melts.

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Section: Implications On Processes Of Subduction Zone Crustal Recyclingmentioning

confidence: 99%

Section: Implications On Processes Of Subduction Zone Crustal Recyclingmentioning

confidence: 99%

Mg-Fe isotopes trace the mechanism of crustal recycling and arc magmatic processes in the Neo-Tethys subduction zone

Chen

Deng

et al. 2023

Preprint

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“…Because La is more mobile than Sm in melts (Kessel et al, 2005) and fractional crystallisation and large degrees of partial melting have limited influence on La/ Sm (<~20%; Labanieh et al, 2012), high La/Sm ratios have been used as a proxy for the addition of sediment melts to the mantle (e.g. Im et al, 2021;Li et al, 2022). Figure 3d shows that the alkaline volcanic rocks and ore-associated suites in the Sanjiang belt have similar La/Sm ratios of ~7-14 at SiO 2 contents of ~60-75 wt.%, which are significantly higher than those of the mafic lower crust-derived melts (La/Sm < ~4; Qian & Hermann, 2013).…”

Section: Significance Statementmentioning

confidence: 99%

A metasomatised mantle origin for post‐collisional porphyry ore‐forming magmas in the Sanjiang metallogenic belt, Southwest China

Hao

Park

2023

Terra Nova

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We constrain the magma sources of representative post‐collisional ore‐associated and barren suites in the Sanjiang metallogenic belt, Southwest China. The ore‐associated suites generally have higher Mg# and Cr and Ni contents than the crustal melts. Also, they show wide ranges of whole‐rock Nd and zircon Hf isotopes that are similar to the subduction‐modified mantle‐derived alkaline volcanic rocks in the region. Combing with the geochemical model, we suggest that the ore‐associated suites dominantly originated from partial melts of subduction‐metasomatised mantle by fractional crystallisation. In contrast, the barren suites are mainly characterised by low Mg# and Cr and Ni contents that are comparable to the crustal melts and they have enriched whole‐rock Nd and zircon Hf isotopes, indicating a metasomatised lower crustal origin. The different magma sources play an important role in controlling the fertility of contemporary ore‐associated and barren magmatic suites during post‐collisional porphyry ore formation.

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“…The AOC‐derived fluid, sediment‐derived melt, SF, and diapiric solid mélange are all important agents for transporting crustal materials from the slab to the mantle wedge source of arc magmas. Nevertheless, the relative roles of these agents, and whether there is a dominant agent, have been greatly debated (e.g., L. Chen et al., 2021; Codillo et al., 2018; Cruz‐Uribe et al., 2018; H. Li et al., 2022; Nielsen & Marschall, 2017; Parolari et al., 2021; Turner & Langmuir, 2022).…”

Section: Implications On Processes Of Subduction Zone Crustal Recyclingmentioning

confidence: 99%

Fe–Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo‐Tethys Subduction Zone

Chen,

Li,

Deng

et al. 2023

JGR Solid Earth

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There has been intense debate on the mechanism of crustal recycling in subduction zones, and Fe–Mg isotopes may provide new constraints on this issue. This study reports Fe–Mg isotope data for mafic plutonic rocks from the eastern and central Gangdese arc, along with their associated trench sediments in southern Tibet. The δ26Mg values of the eastern Gangdese arc rocks show negative correlations with (87Sr/86Sr)i and (206Pb/204Pb)i values, but positive correlations with εNd(t) and εHf(t) values. Conversely, the δ56Fe values of the eastern Gangdese arc rocks show positive correlations with (87Sr/86Sr)i and (206Pb/204Pb)i values, but negative correlations with εNd(t) and εHf(t) values. The Mg and Fe isotopic compositions of the central Gangdese arc rocks are comparable with those of the eastern ones, but they do not correlate with Sr–Pb–Nd–Hf isotopic compositions. Notably, the Fe–Mg isotopic compositions of most arc rocks fall between those of local trench sediments and the mantle wedge. Combined qualitative analyses and quantitative simulations suggest that: (1) the Fe–Mg isotope variations observed in the eastern Gangdese arc rocks highlight the important role of source mixing between sediment‐derived melts and peridotite, whereas (2) the Fe–Mg isotope variations observed in the central Gangdese arc rocks reflect the superposition of carbonated serpentinite‐derived Mg‐rich fluids‐peridotite source mixing and source melting. The strong correlations between Fe–Mg isotope ratios and traditional geochemical tracers provide further evidence for the recycling of crustal materials in subduction zones via various types of slab‐derived fluids and melts.

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Melting of subducted slab dictates trace element recycling in global arcs

Abstract: Temperature-dependent trace element fractionation during melting of subducted slab can explain the composition of arc magmas.

Cited by 29 publications

References 56 publications

Mg-Fe isotopes trace the mechanism of crustal recycling and arc magmatic processes in the Neo-Tethys subduction zone

Mg-Fe isotopes trace the mechanism of crustal recycling and arc magmatic processes in the Neo-Tethys subduction zone

A metasomatised mantle origin for post‐collisional porphyry ore‐forming magmas in the Sanjiang metallogenic belt, Southwest China

Fe–Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo‐Tethys Subduction Zone

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