Molybdenum partitioning behavior and content in the depleted mantle: Insights from Balmuccia and Baldissero mantle tectonites (Ivrea Zone, Italian Alps)

Wang, Zaicong; Becker, Harry

doi:10.1016/j.chemgeo.2018.09.023

Cited by 15 publications

(10 citation statements)

References 74 publications

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“…Total procedural blanks on Mo are below 4 ng, negligible compared to the total amount of >100 ng of Mo processed of each sample. The ultra-low concentraton Lherzolite (PRE-1901) from the Ivrea zone (N. Italy) yielded 26 ng/g of Mo in agreement with depleted mantle values of <30 ng/g reported from this area (Wang and Becker, 2018) and highlights low blank levels during sample processing.…”

Section: Molybdenum Isotope Measurementssupporting

confidence: 79%

“…Additionally, a lherzolite (PRE-1901) with a low Mo concentration from the Ivrea zone in northern Italy was treated identically (including milling) to validate contamination free sample processing. This lherzolite is well suited for this test as it is comparable to samples measured for Mo contents by Wang and Becker (2018) that yielded Mo concentrations below 30 ng/g. For Mo isotopic analysis 200-800 mg of rock powder was weighed into 25 mL Teflon beaker and mixed with a Mo double-spike solution, enriched in 97 Mo and 100 Mo.…”

Section: Molybdenum Isotope Measurementsmentioning

confidence: 88%

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Molybdenum and titanium isotopic signatures of arc-derived cumulates

et al. 2023

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Section: Molybdenum Isotope Measurementssupporting

confidence: 79%

Section: Molybdenum Isotope Measurementsmentioning

confidence: 88%

Molybdenum and titanium isotopic signatures of arc-derived cumulates

et al. 2023

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“…We thus suggest that the mantle sulfides could be the third endmember. However, some researchers envision only a minor influence of mantle (SCLM) sulfides on the bulk Mo budget due to the relatively low Mo contents and small proportion of sulfides (Wang & Becker, 2018). Nevertheless, the Mo contents in sulfides or sulfidic liquid can be quite heterogeneous (0.05–250 ppm; Greaney et al, 2018; Voegelin et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization‐Related Adakitic Rocks in Central‐Eastern China: New Insights Into their Petrogenesis and Crust‐Mantle Interaction

Fan

Wang

et al. 2020

JGR Solid Earth

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The voluminous Late Mesozoic porphyry ore-related adakitic magmatism in central-eastern China is crucial to understand the deep geodynamic process of the region and controls on porphyry deposit formation globally. Here, we present a novel study of whole-rock MoB isotopes on the mineralization-related adakitic rocks from the Dexing (located in the interior of South China and associated with giant porphyry Cu deposits), and Middle-Lower Yangtze River (MLYR) (host to one of the largest porphyry Cu-Au deposit belts) areas in central-eastern China. The Dexing adakitic rocks have δ 98/95 Mo ranging from −0.31‰ to −0.01‰ and δ 11 B from −17.65‰ to −11.49‰. The adakitic rocks from the MLYR area have δ 98/95 Mo values of −0.5‰ to 0.2‰ and δ 11 B values of −14.48‰ to −9.53‰. The δ 98/95 Mo values of both the Dexing and MLYR samples negatively correlate with the La/Yb and La/Sm ratios. Together with the high Mg#, Cr, and Ni contents, these results indicate a process of melt-mantle interaction resulting in hybridization of initial adakitic melts with low δ 98/95 Mo and mantle-derived melts/components with high δ 98/95 Mo. These adakitic rocks have distinct Mo isotope systematics compared with those of oceanic slab-derived adakites and MORB-type eclogites. Their relatively low δ 11 B values and the lack of correlation between δ 11 B and B contents support a mafic lower crust source for the initial adakitic melts. We thus suggest that these adakitic rocks were generated by partial melting of delaminated lower crust followed by interaction with the deep mantle, and that melt-mantle interaction may facilitate Cu-Mo-Au mineralization.

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“…The metasomatized peridotites are classified by rare earth element (REE) patterns and (La/Sm)N > 1 (Liu et al, ). The data sources: pyroxenites (Wang & Becker, ; Wang, Lazarov, et al, ), BM + BD peridotites (Huang et al, ; Wang & Becker, ; Wang, Lazarov, et al, ), metasomatized and nonmetasomatized peridotites (Ben et al, ; Ikehata & Hirata, ; Liu et al, ; Savage, Moynier, Chen, et al, ), and chondrite values (McDonough & Sun, ).…”

Section: Discussionmentioning

confidence: 99%

“…Such apparent discrepancy is also present for radiogenic isotopes; for instance, the depleted mantle is significantly more heterogeneous than inferred from the compositions of the MORBs (e.g., 87 Sr/ 86 Sr and 143 Nd/ 144 Nd; Lambart et al, ). The observation could be the natural consequence of efficient mixing and fractional crystallization of migrating melts from the mantle to surface (e.g., Coogan & O'Hara, ; Lambart et al, ; Shorttle, ; Wang & Becker, ). Similarly, the homogeneous δ 65 Cu of most basalts and komatiites can be ascribed to efficient homogenization of mantle‐derived isotopic variations by magma mixing during transport and crystallization.…”

Section: Discussionmentioning

confidence: 99%

Copper Isotope Variations During Magmatic Migration in the Mantle: Insights From Mantle Pyroxenites in Balmuccia Peridotite Massif

Zou

Wang

et al. 2019

JGR Solid Earth

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The crust shows large variations in Cu isotopic composition (δ 65 Cu relative to NIST 976) resulting from redox reactions and other supergene processes. The significant range of δ 65 Cu in mantle peridotites thus could be ascribed to recycled crustal materials and/or oxidative mantle metasomatism. However, the influence of normal magmatic fractionation processes on δ 65 Cu variations remains poorly understood, and it is unclear whether the magmatic processes also lead to large δ 65 Cu variations in mantle rocks. To address the issue, we present bulk-rock δ 65 Cu of fresh mantle pyroxenites from the Balmuccia peridotite massif, Northern Italy. These pyroxenites formed by melt-peridotite reaction and mineral accumulation from MORB-to OIB-like, sulfide-saturated basic magmas. Mass balance calculations show that sulfide phases host >98 wt % of the Cu budget of bulk rocks (87−484 μg/g). The pyroxenites show significant variations of δ 65 Cu from −0.66‰ to 0.66‰, which cover the range known for peridotites, including metasomatized ones. Three subsamples from the same pyroxenite layer display >0.3‰ decrease in δ 65 Cu with progressive differentiation. Nevertheless, δ 65 Cu does not display correlations with indicators of magmatic differentiation (e.g., Mg# and Cu/Pd) for all pyroxenites in this study. This might be attributed to variable extents of magmatic sulfide segregation for different samples and/or varying δ 65 Cu of the pyroxenite parent magmas, which were also affected by reactive migration through peridotites. The combined processes can change δ 65 Cu of evolving magmas and reacted peridotites and lead to Cu isotopic heterogeneity in the mantle, without involvement of oxidative metasomatism or recycled crustal materials.

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Molybdenum partitioning behavior and content in the depleted mantle: Insights from Balmuccia and Baldissero mantle tectonites (Ivrea Zone, Italian Alps)

Cited by 15 publications

References 74 publications

Molybdenum and titanium isotopic signatures of arc-derived cumulates

Molybdenum and titanium isotopic signatures of arc-derived cumulates

Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization‐Related Adakitic Rocks in Central‐Eastern China: New Insights Into their Petrogenesis and Crust‐Mantle Interaction

Copper Isotope Variations During Magmatic Migration in the Mantle: Insights From Mantle Pyroxenites in Balmuccia Peridotite Massif

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