Molybdenum isotope fractionation in the mantle

Liang, Y.; Halliday, Alex N.; Siebert, Christopher; Fitton, J. Godfrey; Burton, Kevin W.; Wang, Kuo‐Lung; Harvey, Jason

doi:10.1016/j.gca.2016.11.023

Cited by 90 publications

(95 citation statements)

References 80 publications

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“…The eleven igneous rock reference materials, including one carbonatite (except for UB-N), in this study had d 98/95 Mo values ranging from -0.51 ± 0.04‰ (2s, n = 5, olivine basalt, GSR-3; Table 1) to +0.20 ± 0.11‰ (2s, n = 5, WGB-1; Table 1), with a mean of -0.12 ± 0.37‰ (2s). Either d 98/95 Mo data (range from -0.56 ± 0.01‰ to +0.53 ± 0.21‰) for a suite of mafic and ultramafic rocks reported by Liang et al (2013), or mean value d 98/95 Mo = -0.17 ± 0.22‰ renormalised to NIST SRM 3134 using the conversion of Greber et al (2012) for several igneous rocks from Kamchatka obtained by Siebert et al (2003) are within the range of our Mo isotope data for igneous rock reference materials (Table 1). The Mo isotope compositions for most igneous rocks in the present study (except UB-N, GSR-3, WGB-1; Table 1 and Figure 3) are close to that of estimated chondritic (-0.16 ± 0.02‰, Burkhardt et al 2014) and Bulk Silicate Earth (-0.21 ± 0.06‰, Greber et al 2015).…”

Section: Mo Mass Fractions and Isotopic Compositions Of Geological Rementioning

confidence: 93%

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Zhao

Zhang

et al. 2015

Geostandard Geoanalytic Res

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The double-spike method with multi-collector inductively coupled plasma-mass spectrometry was used to measure the Mo mass fractions and isotopic compositions of a set of geological reference materials including the mineral molybdenite, seawater, coral, as well as igneous and sedimentary rocks. The long-term reproducibility of the Mo isotopic measurements, based on two-year analyses of NIST SRM 3134 reference solutions and seawater samples, was ≤ 0.07‰ (two standard deviations, 2s, n = 167) for d Molybdenum (Mo) is one of the most abundant transition metals in the oceans and is important for a range of biological and geochemical processes (Manheim and Landergren 1974, Colodner et al. 1995, Morford and Emerson 1999. It has seven stable isotopes with relative abundances ranging from 9% to 25%, covering a mass range of about 8% (Anbar 2004). Molybdenum isotopes are increasingly being used in Earth sciences. Of particular interest is the highly redox-sensitive behaviour of Mo, which is primarily used to investigate the oxygenation of Earth's ocean and atmosphere (Barling et al.

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Section: Mo Mass Fractions and Isotopic Compositions Of Geological Rementioning

confidence: 93%

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Zhao

Zhang

et al. 2015

Geostandard Geoanalytic Res

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“…The Mo concentrations (1.57–1.64 ug/g) of the dacites are higher than the andesites (0.22–1.19 ug/g). However, the andesites and the dacites have similar Mo isotopic compositions (δ 98 / 95 Mo = ~ − 0.40–0.13‰, −0.10–‐0.06 ‰), all of which cover a larger range compared to MORB (Bezard et al, ; Liang et al, ; Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…Solomon arc lavas, Bismarck arc lavas, and Cyprus arc lavas are from Kǒnig et al (). Mid‐ocean ridge basalt field data are from Bezard et al () and Liang et al (). S‐type granites and sediments of LFB and NEB field data are from Yang et al ().…”

Section: Resultsmentioning

confidence: 99%

“…Nd isotopes and Hf‐Nd compositions of E. Sunda and Java sediment are from Plank and Langmuir (). Ce‐Mo and δ 98/95 Mo NIST3134 (‰) compositions of the mantle are from Liang et al (). Ce‐Mo and δ 98/95 Mo NIST3134 (‰) compositions of Lesser Antilles Arc recent/old arc lavas and Site 144/543 sediments are from Gaschnig et al () and Freymuth et al ().…”

Section: Discussionmentioning

confidence: 99%

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Arc Andesitic Rocks Derived From Partial Melts of Mélange Diapir in Subduction Zones: Evidence From Whole‐Rock Geochemistry and Sr‐Nd‐Mo Isotopes of the Paleogene Linzizong Volcanic Succession in Southern Tibet

Yan

Long

et al. 2019

JGR Solid Earth

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Formation of andesitic rocks is crucial to understand the evolution of continental crust.Here we present an integrated study for the Paleocene Dianzhong Formation of the Linzizong volcanic succession (LVS) in the Lhasa terrane, southern Tibet. The andesites of the Dianzhong Formation have relatively high Mg # (38-60) and exhibit typical subduction-like geochemical signatures. They are characterized by slightly enriched ε Nd (t) values (−2.82-0.35) and have a range of δ 98 / 95 Mo isotopic compositions (−0.40 to 0.13 ‰) larger than mid-ocean ridge basalt. Their high Mg # , moderate light rare earth element-enriched patterns, and slightly enriched ε Nd (t) values clearly rule out an origin of continental crust-derived melts or partial melts of earlier underplated mafic rocks. The dacites show similar geochemistry to the andesites, indicating an origin from the parental magmas of the andesites. Based on the geochemical comparisons between the Dianzhong andesites and rocks of mélange, we suggest that the andesitic rocks of the LVS were derived from partial melts of a mantle source dominated by mélange that formed along the subduction channel. The mélange diapir melting was triggered by asthenospheric upwelling and corner flow during the Paleocene slab roll-back of northward subducted Neotethyan oceanic crust. Because the Early Paleocene andesitic rocks in southern Lhasa show an average composition of continental crust, the partial melting of mélange rocks most likely provide an important mechanism for the production of andesitic magmas within continental arcs.

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“…Indeed, all the analyzed magmas outline a relatively narrow δ 98/95 Mo range, with values between 0.10‰ and 0.26‰ for Vesuvius and 0.07‰ and 0.24‰ for Tuscan magmas, covering a total range of Δ 98/95 Mo of 0.18‰ (Table 1). The studied magmas have considerably higher δ 98/95 Mo than MORBs (Bezard et al, 2016;Freymuth et al, 2015;Liang et al, 2017) and are among the heaviest Mo isotope compositions recorded so far in subduction-related magmas (e.g., Aegean arc, Cyprus, Marianas, Solomon Islands, and Papua New Guinea; Freymuth et al, 2015;König et al, 2016;Voegelin et al, 2014;Figure 4c Geochemistry, Geophysics, Geosystems case, the trace element, radiogenic isotope, and Mo isotope compositions have been advocated to support the predominant role of recycled sedimentary material into their magma source with no Mo isotope fractionation Gaschnig et al, 2017). In contrast, in the second two cases the Mo isotope variation from isotopically light to heavy values has been interpreted as due to isotopic fractionation during (Freymuth et al, 2015Gaschnig et al, 2017;König et al, 2016;Voegelin et al, 2014;Wille et al, 2018) and MORB average (Gale et al, 2013).…”

Section: Volcanic Rocksmentioning

confidence: 85%

Ce/Mo and Molybdenum Isotope Systematics in Subduction‐Related Orogenic Potassic Magmas of Central‐Southern Italy

Casalini

Avanzinelli

Tommasini

et al. 2019

Geochem Geophys Geosyst

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Several recent studies have employed variations in the concentration and isotopic composition of molybdenum as tracers of igneous processes. In this study we present new Mo concentration and δ98/95Mo data on the peculiar subduction‐related potassic magmas of the Central‐Southern Italian peninsula; the leucite‐free (lamproite‐like) rocks of the Tuscan Magmatic Province and the leucite‐bearing rocks of Mt. Vesuvius. These rocks display exotic and distinctive geochemical and isotopic features due to differences in the lithology of the subducted material in their respective mantle sources. We examine the elemental and isotopic systematics of Mo in the context of these geochemical variations. The two different associations of magmas display significantly different Ce/Mo values but surprisingly similar δ98/95Mo values (0.10–0.26‰ for Vesuvius and 0.07–0.24‰ for Tuscan Magmatic Province), which are significantly heavier than typical mid‐ocean ridge basalts. While the δ98/95Mo implicate an isotopically heavy sedimentary component recycled into their respective mantle sources, the different Ce/Mo ratios reflect contrasting elemental fractionation during sediment melting related to the lithology and consequent residual mineralogy (sulfides vs. epidote) of the subducted sedimentary material undergoing melting (Ca poor vs. Ca rich). This indicates that the heavy Mo isotopic signature of these magmas is independent of the lithology of the recycled material, which instead controls the elemental fractionation of Mo.

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Molybdenum isotope fractionation in the mantle

Cited by 90 publications

References 80 publications

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Arc Andesitic Rocks Derived From Partial Melts of Mélange Diapir in Subduction Zones: Evidence From Whole‐Rock Geochemistry and Sr‐Nd‐Mo Isotopes of the Paleogene Linzizong Volcanic Succession in Southern Tibet

Ce/Mo and Molybdenum Isotope Systematics in Subduction‐Related Orogenic Potassic Magmas of Central‐Southern Italy

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