Thallium as a tracer of fluid–rock interaction in the shallow Mariana forearc

Nielsen, Sune G.; Klein, Frieder; Kading, Tristan; Blusztajn, Jerzy; Wickham, Katie

doi:10.1016/j.epsl.2015.09.001

Cited by 43 publications

(33 citation statements)

References 52 publications

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“…Furthermore, the most isotopically distinct result (serpentinite UB‐N: ε 205 Tl SRM997 = +1.8 ± 0.4 2 s ) is consistent with the findings of Nielsen et al . (). To the best of our knowledge, these authors provide the only literature report of ε 205 Tl SRM997 in natural serpentinite samples, and these show similarly heavy Tl isotope compositions, providing indirect validation of our isotopically heavy serpentinite RM.…”

Section: Resultsmentioning

confidence: 97%

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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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Section: Resultsmentioning

confidence: 97%

“…); 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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“…Other potential sources would be organic matter derived from subducted pelagic sediments or in situ production within the forearc system via abiotic or biological processes. Isotope studies suggest influx of fluids derived from a mixture of subducted pelagic sediments and altered oceanic crust into the forearc mantle facilitating serpentinization (25). However, their sources remain controversial (26)(27)(28), and the nature of the organic material that is potentially carried with these fluids is largely unknown.…”

Section: Serpentinite Clasts From the South Chamorro Mud Volcanomentioning

confidence: 99%

“…In contrast, a slowly ascending serpentinite mud along deep-reaching forearc faults may allow the system to remain much closer to equilibrium, regulating the activities of H 2 , CH 4 , CO 2 , and the Fe(II)/Fe(III) ratio in the solids and fluids limiting energy sources. Nielsen et al (25), however, documented the occurrence of rodingite within the Mariana serpentinite mud volcanoes derived from in situ alteration within the forearc mantle. These rocks suggest hydrothermal interactions between .…”

Section: ) Indicate Thatmentioning

confidence: 99%

Subduction zone forearc serpentinites as incubators for deep microbial life

Plümper

Geisler

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Serpentinization-fueled systems in the cool, hydrated forearc mantle of subduction zones may provide an environment that supports deep chemolithoautotrophic life. Here, we examine serpentinite clasts expelled from mud volcanoes above the Izu-BoninMariana subduction zone forearc (Pacific Ocean) that contain complex organic matter and nanosized Ni-Fe alloys. Using time-of-flight secondary ion mass spectrometry and Raman spectroscopy, we determined that the organic matter consists of a mixture of aliphatic and aromatic compounds and functional groups such as amides. Although an abiotic or subduction slab-derived fluid origin cannot be excluded, the similarities between the molecular signatures identified in the clasts and those of bacteria-derived biopolymers from other serpentinizing systems hint at the possibility of deep microbial life within the forearc. To test this hypothesis, we coupled the currently known temperature limit for life, 122°C, with a heat conduction model that predicts a potential depth limit for life within the forearc at ∼10,000 m below the seafloor. This is deeper than the 122°C isotherm in known oceanic serpentinizing regions and an order of magnitude deeper than the downhole temperature at the serpentinized Atlantis Massif oceanic core complex, MidAtlantic Ridge. We suggest that the organic-rich serpentinites may be indicators for microbial life deep within or below the mud volcano. Thus, the hydrated forearc mantle may represent one of Earth's largest hidden microbial ecosystems. These types of protected ecosystems may have allowed the deep biosphere to thrive, despite violent phases during Earth's history such as the late heavy bombardment and global mass extinctions.deep biosphere | serpentinization | subduction zone | forearc

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“…Noll et al () documented the increase in abundances of As and Pb in arc lavas due to fluid mobility, while abundances of Cu, Zn, Mo, Sn, and W did not increase above lithophile equivalents. 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, ).…”

Section: Discussionmentioning

confidence: 98%

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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Thallium as a tracer of fluid–rock interaction in the shallow Mariana forearc

Cited by 43 publications

References 52 publications

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

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

Subduction zone forearc serpentinites as incubators for deep microbial life

Elemental Systematics in MORB Glasses From the Mid‐Atlantic Ridge

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