The influence of crustal recycling on the molybdenum isotope composition of the Earth's mantle

Hin, Remco C.; Hibbert, Kate E.J.; Chen, Shuo; Willbold, M.; Andersen, Morten B.; Kiseeva, Ekaterina S.; Wood, Bernard J.; Niu, Yaoling; Sims, Kenneth W.W.; Elliott, Tim

doi:10.1016/j.epsl.2022.117760

Cited by 23 publications

(21 citation statements)

References 53 publications

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“…The samples from Siah-Kuh broadly define a positive linear correlation in δ 98 Mo with differentiation indices of increasing silica, and decreasing magnesium and iron. Compared to the depleted mantle (Mo: ≤ 30 ng/g, δ 98 Mo: − 0.22 ± 0.03‰; e.g., Wang and Becker, 2018;Greber et al, 2015;McCoy-West et al, 2019;Hin et al, 2022) our samples have higher Mo contents and are overall isotopically heavier. Compared to evolved samples from Kos, granites from Torres del Paine and the granitic continental crust (δ 98 Mo of ca.…”

Section: Molybdenum Concentrations and Isotopesmentioning

confidence: 62%

“…Dashed green lines indicate Mo concentration (<30 ng/g, Wang and Becker, 2018) and Mo isotopic composition of the depleted mantle (− 0.22 ± 0.03‰, e.g. Greber et al, 2015;McCoy-West et al, 2019;Hin et al, 2022). Red dashed line corresponds to the average δ 49 Ti value of the Bulk Silicate Earth (+0.005 ± 0.012‰; Millet et al, 2016).…”

Section: Opaque Mineralogy In Cumulatesmentioning

confidence: 99%

“…These isotopic signatures can subsequently be affected by late-stage magmatic-hydrothermal processes, e.g., in evolved (upper crustal) plutonic rocks where Mo enriched fluids exsolve from the solidifying magma (Kaufmann et al, 2021). Therefore, the δ 98 Mo of arc lavas is variable but heavier on average (+0.07 ± 0.68‰; Villalobos-Orchard et al, 2020) than the mantle (− 0.22 ± 0.03‰, Greber et al, 2015;Bezard et al, 2016;McCoy-West et al, 2019;Hin et al, 2022) and lighter than felsic volcanics (>63 wt% SiO 2 ; +0.20 ± 0.15‰, Voegelin et al, 2014;Gaschnig et al, 2017;Wille et al, 2018) and granitoids (>63 wt% SiO 2 ; +0.13 ± 0.79 ‰, Greber et al, 2011;Neubert et al, 2011;Voegelin et al, 2012;Yang et al, 2017;Kaufmann et al, 2021). The processes leading to a heavier Mo isotopic composition of evolved rocks compared to arc-basalts has remained a matter of debate (Fan et al, 2021;Chen et al, 2022;Ma et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Molybdenum and titanium isotopic signatures of arc-derived cumulates

et al. 2023

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Section: Molybdenum Concentrations and Isotopesmentioning

confidence: 62%

Section: Opaque Mineralogy In Cumulatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molybdenum and titanium isotopic signatures of arc-derived cumulates

et al. 2023

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“…In this context, the marginally less well‐defined trend between δ 98/95 Mo and Ba/Th (Figure 4) is most likely a reflection of the more variable Ba/Th in Mid‐Ocean Ridge Basalts (MORB) (i.e., the source of Ba in the fluid), compared to more homogeneous Ce/Mo and Ce/Pb compositions. For instance, the single relative standard deviation of Ba/Th for Pacific and Indian MORB samples, for which combined δ 98/95 Mo and trace element data are available (Bezard et al., 2016; Chen et al., 2022; Hin et al., 2022; Liang et al., 2017), is 38%, compared to 29% for Ce/Mo and Ce/Pb. In addition, the mobilization of Mo in slab fluids critically depends on the presence of complexing agents (Bali et al., 2012), whereas Ba is a highly fluid‐mobile element.…”

Section: Discussionmentioning

confidence: 99%

“…In this respect, the Pb isotope composition of Kamchatka arc lavas does not match the Pb isotope composition of drilled basalts and sediments from DSDP Site 192, sampling the altered crustal section of the Hawaii-Emperor Seamount Chain that is currently being subducted into the Kamchatka arc (Figure 5). The Pb isotope systematic of the Kamchatka arc lavas is (Bezard et al, 2016;Chen et al, 2022;Hin et al, 2022;Liang et al, 2017) for reference. therefore inconsistent with the derivation of a slab fluid component originating in altered, upper part of the subducted Hawaii-Emperor Seamount Chain crust.…”

Section: Slab Contribution To the Mo Budget Of The Eastern Volcanic F...mentioning

confidence: 99%

Systematic Across‐Arc Variations of Molybdenum Isotopes in a Fluid‐Dominated Subduction Zone System

Willbold,

Messling

2023

Geochem Geophys Geosyst

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Mass‐dependent Mo isotope variations are a promising new tracer to study magmatic processes in different geological settings. We report the first Mo isotope data for the Kamchatka arc system in the Northwest Pacific, comprising basaltic lavas of a complete Southeast‐Northwest traverse from the volcanic arc front through to the back arc region. The majority of volcanic centers investigated directly override the Hawaii‐Emperor Seamount Chain, which is currently being subducted underneath the arc system. Our Mo isotope data show systematic trends with Ce/Pb, Ce/Mo, Nb/Zr, La/Sm, and 143Nd/144Nd ratios from the volcanic arc front to the back arc. Arc front lavas have higher δ98/95Mo and lower Ce/Pb, Ce/Mo, Nb/Zr, La/Sm compared to back arc lavas. Because the involvement of subducted sediments can be excluded, we attribute the observed variations to a change in the mantle source composition from the arc front to the back arc regions. The isotopic and chemical budget of arc front lavas is dominated by a slab fluid component (high δ98/95Mo, low Ce/Pb, Ce/Mo), whereas mantle‐like Ce/Pb, Ce/Mo, elevated Nb/Zr and La/Sm in the back arc samples suggest an enriched mantle source. Combined δ98/95Mo, Nd, and Pb isotope data in back arc lavas are very similar to those observed for modern ocean island basalts from Hawaii. We thus explore the possibility that the back arc mantle was contaminated by a Hawaii‐type, enriched asthenospheric mantle component from the subducted Hawaii‐Emperor Seamount Chain.

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Tracing subducted oceanic slabs in the mantle by using molybdenum isotopes: A case study of intraplate basalts from Northeast China

Zheng,

Gao,

Fan

et al. 2024

Geological Journal

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Determining subduction‐related processes is crucial for understanding lithological heterogeneity, as substantial quantities of slabs are recycled into the mantle. Molybdenum isotopes are valuable for distinguishing sources materials due to the significant isotope differences between the crust and the mantle. In this study, we systematically investigate Mo isotopes in a suite of well‐characterized continental basalts from Keluo and Halaha‐Chaoer, located in Northeast China. The δ98Mo values of Keluo range from −0.41 to −0.23‰, with an average of −0.34‰, while Halaha‐Chaoer samples ranged from −0.18 to −0.12‰, with an average of −0.15‰. The δ98Mo values of Keluo basalts are lighter than the mean value of fresh oceanic basalts (−0.21‰), whereas those of Halaha‐Chaoer basalts are similar to oceanic basalts. Combined with other geochemical indications (LOI, Ce/Pb, La/Yb and so on), the Mo isotopic variations cannot be attributed to chemical weathering, continental crust contamination or magmatic processes. Instead, the δ98Mo variations in this study are explained by the incorporation of different oceanic crustal materials into the magma sources. Correlations of δ98Mo with Ba/Th, Th/U, 143Nd/144Nd indicated that both sediment and altered oceanic crust have significantly influenced these variations. This study demonstrates the potential of Mo isotopes to distinguish different types of recycled oceanic crust materials.

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The influence of crustal recycling on the molybdenum isotope composition of the Earth's mantle

Cited by 23 publications

References 53 publications

Molybdenum and titanium isotopic signatures of arc-derived cumulates

Molybdenum and titanium isotopic signatures of arc-derived cumulates

Systematic Across‐Arc Variations of Molybdenum Isotopes in a Fluid‐Dominated Subduction Zone System

Tracing subducted oceanic slabs in the mantle by using molybdenum isotopes: A case study of intraplate basalts from Northeast China

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