Tracking along-arc sediment inputs to the Aleutian arc using thallium isotopes

Nielsen, Sune G.; Yogodzinski, G. M.; Prytulak, Julie; Plank, Terry; Kay, Suzanne Mahlburg; Kay, Robert W.; Blusztajn, Jerzy; Owens, Jeremy D.; Auro, Maureen E.; Kading, Tristan

doi:10.1016/j.gca.2016.03.010

Cited by 57 publications

(54 citation statements)

References 83 publications

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“…In each case, the sediment compositions represent systematic studies of the average sediment subducting underneath each respective arc (see the Supplementary Materials). For all three arcs, as well as the Aleutians ( 22 ), Ryukyu, Scotia, Kurile, and Sunda arcs (fig. S1), lavas closely follow the mixing lines predicted by bulk sediment mixing.…”

Section: Resultsmentioning

confidence: 98%

“…A very effective means of discriminating the two models is by using plots of 87 Sr/ 86 Sr versus 143 Nd/ 144 Nd, because the elemental Nd/Sr ratios of bulk sediment and AOC are very different to those of sediment melts and AOC-derived fluids ( 13 , 14 , 22 ). In particular, both sediment melts and AOC fluids display much higher Sr/Nd than do their respective bulk counterparts.…”

Section: Resultsmentioning

confidence: 99%

“…An alternative interpretation of the Sr-Nd isotope plots would be if fluids that were released from the slab plotted at or very close to the mantle wedge composition, which requires that the oceanic crust had the same Sr-Nd isotope compositions as the mantle wedge ( 22 ). Because of the potentially small contrast in Nd/Sr between AOC fluids and sediment melts ( 13 , 14 ), the curvature of the mixing lines between these two components might resemble that of mixing between bulk sediments and the mantle wedge.…”

Section: Discussionmentioning

confidence: 99%

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Geochemical evidence for mélange melting in global arcs

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Geochemical evidence for mélange melting in global arcs

2017

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“…); and use as a tracer of contributions to the source regions of igneous materials (Nielsen et al . 2006b, , , , Prytulak et al . , , Shu et al .…”

Section: The Literature Mc‐icp‐ms Tl Isotope Ratio Data For Igneous Rmentioning

confidence: 99%

Thallium Mass Fraction and Stable Isotope Ratios of Sixteen Geological Reference Materials

Brett

Prytulak

Hammond

et al. 2018

Geostandard Geoanalytic Res

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Thallium stable isotope ratio and mass fraction measurements were performed on sixteen geological reference materials spanning three orders of magnitude in thallium mass fraction, including both whole rock and partially separated mineral powders. For stable isotope ratio measurements, a minimum of three independent digestions of each reference material was obtained. High‐precision trace element measurements (including Tl) were also performed for the majority of these RMs. The range of Tl mass fractions represented is 10 ng g−1 to 16 μg g−1, and Tl stable isotope ratios (reported for historical reasons as ε205Tl relative to NIST SRM 997) span the range −4 to +2. With the exception – attributed to between‐bottle heterogeneity – of G‐2, the majority of data are in good agreement with published or certified values, where available. The precision of mean of independent measurement results between independent dissolutions suggests that, for the majority of materials analysed, a minimum digested mass of 100 mg is recommended to mitigate the impact of small‐scale powder heterogeneity. Of the sixteen materials analysed, we therefore recommend for use as Tl reference materials the USGS materials BCR‐2, COQ‐1, GSP‐2 and STM‐1; CRPG materials AL‐I, AN‐G, FK‐N, ISH‐G, MDO‐G, Mica‐Fe, Mica‐Mg and UB‐N; NIST SRM 607 and OREAS14P.

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“…Prytulak et al () did not find evidence of fluid mobile behavior of Tl in the Mariana arc, while Jenner et al () found positive Tl enrichments (relative to Ce and Pr) from some Lau back‐arc lavas and Nielsen et al () found Tl strongly partitions into the fluid phase at Mariana forearc. Recent Tl isotopic work indicates that the Tl budget of arc lavas are dominated by Tl from pelagic clays from a sediment mélange (Nielsen et al, , ; Shu et al, ). Jenner et al () also found correlated enrichments of As, Tl, Pb, and Bi in backarc lavas from the Manus Basin, which were interpreted by Jenner () as evidence of fluid enrichment of As, Tl, Pb, Sb, and Bi to arc crust.…”

Section: Discussionmentioning

confidence: 99%

Elemental Systematics in MORB Glasses From the Mid‐Atlantic Ridge

Yang

Humayun

Salters

2018

Geochem Geophys Geosyst

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In this study, a data set of 60 elements in 319 mid‐oceanic ridge basalt (MORB) glasses representing 144 chemically distinct lava flows from the Mid‐Atlantic Ridge was acquired by laser ablation inductively coupled plasma mass spectrometry. Our new data are comparable in terms of the number of elements analyzed to several recent MORB data sets, albeit limited in geographic coverage to the North Mid‐Atlantic Ridge. This extensive data set was used to examine the elemental systematics of depleted (D)‐, normal (N)‐, and enriched (E)‐MORBs. We show that elemental ratios sensitive to fluid transport in subduction zones (e.g., Th/U, Nb/U, Ba/Th, and Ba/La) are constant and similar to their primitive mantle values in N‐ and E‐MORBs, but depleted in accordance with their compatibility in D‐MORBs. The absence of evidence for subduction zone processing indicates the need to reassess the relation between MORB enrichment and recycled materials. Additionally, we reexamined the ratios of chalcophile and siderophile elements to lithophile elements of comparable compatibility, which are important in assessing planetary accretion, core formation, crust‐mantle differentiation, and hydrothermal ore formation processes. MORBs show significant negative anomalies of As, Tl, Pb, and Bi, but not of Sb, relative to lithophile elements of similar compatibility, which cannot be accounted for by melt depletion alone. The depletions of As, Tl, Pb, and Bi in MORB are complementary to significant enrichments observed in the continental crust, indicating that they have been transferred to the continental crust via fluid mobility in arcs or obduction of seafloor hydrothermal ores.

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Tracking along-arc sediment inputs to the Aleutian arc using thallium isotopes

Cited by 57 publications

References 83 publications

Geochemical evidence for mélange melting in global arcs

Geochemical evidence for mélange melting in global arcs

Thallium Mass Fraction and Stable Isotope Ratios of Sixteen Geological Reference Materials

Elemental Systematics in MORB Glasses From the Mid‐Atlantic Ridge

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