Absence of molybdenum isotope fractionation during magmatic differentiation at Hekla volcano, Iceland

Yang, Jie; Siebert, Christopher; Barling, Jane; Savage, Paul S.; Liang, Y.; Halliday, Alex N.

doi:10.1016/j.gca.2015.04.011

Cited by 96 publications

(71 citation statements)

References 68 publications

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“…The average Mo mass fraction of BHVO-2 determined by isotope dilution MC-ICP-MS in this study is identical within uncertainty to the values determined by Yang et al (2015) and Wang et al (2015), and also to our previously isotope dilution MC-ICP-MS values (Li et al 2014). Data for WGB-1 are slightly lower than the reference value (about 0.67 versus 1.2 lg g -1 , respectively), whereas data for JA-2 are higher than the reference value (about 0.99 versus 0.6 lg g -1 , respectively).…”

Section: Mo Mass Fractions and Isotopic Compositions Of Geological Resupporting

confidence: 79%

“…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 2001, Anbar and Knoll 2002, Siebert et al 2003, Arnold et al 2004, Pearce et al 2008, Kendall et al 2009, Dahl et al 2010, Duan et al 2010, Voegelin et al 2010, Czaja et al 2012. However, applications in other fields are being developed, such as in magmatic and hydrothermal geology, planetary sciences and tracking environmental pollution (Siebert et al 2003, Chappaz et al 2012, Hin et al 2013, Lane et al 2013, Burkhardt et al 2014, Yang et al 2015. Mo ratio has been adopted by the majority of the Mo isotope research community.…”

Section: Received 23 Apr 15 -Accepted 10 Aug 15mentioning

confidence: 99%

“…Three drops of concentrated HNO 3 and H 2 O 2 were added to the evaporated Mo to decompose any organic residue. Following this, 1 ml of 3% v/v HNO 3 was added to the Mo residue, after which the solution was ready for Mo isotopic ratio measurement by MC-ICP-MS. Because molybdenite (MoS 2 ) has high Mo mass fractions and no other Li et al (2014) 3.90 -0.05 0.11 Burkhardt et al (2014) 4.55 -0.06 0.03 Wang et al (2015) 3.30 Siebert et al (2015) 3.70 0.00 0.07 Yang et al (2015) 3 …”

Section: Chromatographic Separationmentioning

confidence: 99%

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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 Resupporting

confidence: 79%

Section: Received 23 Apr 15 -Accepted 10 Aug 15mentioning

confidence: 99%

Section: Chromatographic Separationmentioning

confidence: 99%

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Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Zhao

Zhang

et al. 2015

Geostandard Geoanalytic Res

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“…The samples have also been analysed for stable V isotopes and display a striking range of ~ 2‰, correlating with indices of differentiation and again linked to differences in bonding environment of V in minerals and melts and, in this case, are proposed to strongly reflect the fractionation of oxide phases (Prytulak et al, 2017). Finally, the samples have also been analysed for Zn and Mo stable isotopes (Chen et al, 2013;Yang et al, 2015), with both systems demonstrating negligible isotope fractionation with progressive differentiation. Thus Hekla is arguably one of the best-characterised igneous natural laboratories in which to place Tl concentration and isotope measurements into context.…”

Section: Hekla: Geologic and Geochemical Backgroundmentioning

confidence: 99%

Thallium elemental behavior and stable isotope fractionation during magmatic processes

et al. 2017

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Please cite this article as: Prytulak, J., Brett, A., Webb, M., Plank, T., Rehkämper, M., Savage, P.S., Woodhead, J., Thallium elemental behavior and stable isotope fractionation during magmatic processes, Chemical Geology (2016), doi: 10.1016/j.chemgeo. 2016.11.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractStable thallium (Tl) isotopes are an extremely sensitive tracer for the addition of small amounts of sediments or materials altered at low temperatures to the source(s) of mantle-derived melts. The ability of Tl to trace such materials is due to the large concentration contrast between the mantle (Tl < 2ng/g) and possible exotic inputs (Tl ~100ng/g to >g/g), which also often display fractionated Tl isotope compositions.However, the magnitude of Tl isotope fractionation induced by igneous processes alone has not been systematically assessed. Here, two suites of co-genetic magmas, spanning a large range of differentiation, from Hekla, Iceland, and Anatahan, in the Mariana arc, are used to assess the behavior of thallium and its stable isotope variations during magmatic processes. Thallium behaves as a near-perfectly incompatible lithophile element throughout magmatic evolution, mirroring elements such as Rb, Cs, and K. Lavas from Hekla have restricted Cs/Tl ratios and stable Tl isotope compositions, which overlap with mantle estimates. Lavas from subductionrelated Anatahan volcano also have a restricted range in Tl isotope composition, which overlaps with Hekla and MORB, demonstrating that fractional crystallisation and partial melting does not fractionate stable Tl isotopes. Subduction environments display variable Cs/Tl, indicating that the subduction process commonly fractionates these two elements. The immunity of thallium stable isotopes to fractionation by magmatic processes coupled with its extreme sensitivity for tracing pelagic sediments, FeMn crusts and low temperature altered oceanic crust highlight its value in elucidating the nature of mantle sources of both oceanic basalts and arc lavas.Critically, meaningful interpretation of thallium isotope compositions need not be restricted to primitive lavas.

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“…Relatively low δ 98/95 Mo are also reported for suboxic or mildly anoxic sedimentary environments, due to nonquantitative absorption processes. On the other hand, work on Iceland (Yang et al, 2015) and other studies on subduction-related settings (e.g., Casalini, 2018;Freymuth et al, 2015;Gaschnig et al, 2017) found no evidence indicating δ 98/95 Mo fractionation during magma differentiation, but the latter did identify Mo isotopic fractionation during the processes of their genesis. The occurrence of isotopically distinct reservoirs of superficial Mo in sediments that are then recycled into the mantle raised the interest in the use of Mo isotopes as tracers in subduction zones (e.g., Freymuth et al, 2016).…”

Section: Molybdenum Isotope Systematics At Subduction Zonementioning

confidence: 73%

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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Absence of molybdenum isotope fractionation during magmatic differentiation at Hekla volcano, Iceland

Cited by 96 publications

References 68 publications

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Thallium elemental behavior and stable isotope fractionation during magmatic processes

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

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