In situ lithium and boron isotope determinations in mica, pyroxene, and serpentine by LA-MC-ICP-MS

Martin, Céline; Ponzevera, Emmanuel; Harlow, George E.

doi:10.1016/j.chemgeo.2015.07.022

Cited by 42 publications

(37 citation statements)

References 40 publications

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“…Boron isotopes were measured in situ by LA-MC-ICP-MS using an ESI New Wave UP-193-FX ArF* (193 nm) excimer laser coupled to a Neptune Plus (ThermoScientific) MC-ICP-MS (Lamont Doherty Earth Observatory, Columbia University) for B concentrations above 5 ppm (Martin et al, 2015).…”

Section: Appendix 2: Boron Element and Isotopes Resultsmentioning

confidence: 99%

“…The standards used to monitor the B isotopes measurements by LA-MC-ICP-MS are NIST SRM 610 and NIST SRM 612. They yield δ 11 B of -0.3 ± 2.8 ‰ (n = 100) and of +0.7 ± 3.3 ‰ (n = 262) respectively, using LA-MC-ICP-MS method (Martin et al, 2015). The standards used to monitor The B isotopes measurements by SIMS are GOR132-G and B6.…”

Section: Appendix 2: Boron Element and Isotopes Resultsmentioning

confidence: 99%

“…The SMM records a cold subduction, with an eclogitic peak at ~ 480°C, ~ 2.6 GPa (Tsujimori et al, 2006; Fig. I-5) or ~520ºC, ~2.5 GPa and -Endo et al, 2012, and jadeitites crystallizing in the range 250 -425°C, 0.6 -2 GPa(Harlow et al, 2015; Fig. I-5).…”

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confidence: 99%

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Boron isotopic discrimination for subduction-related serpentinites

Martin

Flores

Harlow

2016

Geology

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The Guatemala Suture Zone (GSZ), Guatemala, is a region that contains two distinct suture-related serpentinite mélanges straddling the Motagua fault and an ophiolitic complex paired with the northern mélange. The serpentinite matrix of the mélanges formed by subduction-fluid hydration of peridotite from the deep mantle wedge. The occurrence of serpentinite from both exhumed subduction channel mélange and ophiolite is not uncommon in paleo–suture zones, but distinguishing them and their tectonic origin can be difficult. A new method of discrimination, based on boron isotopes in serpentine from both mélanges and ophiolite, as well as on mica and pyroxene from the metamorphic and vein-rock blocks embedded within the mélanges, has been developed. The metamorphic and vein samples have mainly negative δ11B, ranging from –15.3‰ to +4.3‰, in the same range as the serpentine from the mélanges (–14.4‰ to +9.7‰). In addition to being the most negative δ11B values ever measured in serpentinite, comparable values from vein minerals indicate that the same fluid serpentinized the overlying mantle. In contrast, serpentine samples from the ophiolite have positive δ11B, in the range 0‰ to +18.0‰, consistent with hydration by seawater-derived fluids. As the GSZ displays two mélanges whose serpentinite originated from two different deep subductions and mantle hydration, we hypothesize that the negative signature of exhumed mélange serpentine is the norm and that the B isotopic signature can be a useful tool to discriminate the tectonic origin of serpentinization in paleo–suture zones.

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Section: Appendix 2: Boron Element and Isotopes Resultsmentioning

confidence: 99%

Section: Appendix 2: Boron Element and Isotopes Resultsmentioning

confidence: 99%

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Boron isotopic discrimination for subduction-related serpentinites

Martin

Flores

Harlow

2016

Geology

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“…The following reference standards were used (Table 1): glasses GOR128-G komatiite and StHs6/80-G dacite (Rosner and Meixner 2004), phengite 80-3 (Pabst et al 2012), and micas MVE02-8-5 and JJE01-X-3 (Martin et al 2015). A small offset in δ 11 B of − 1.2% for phengite 80-3 was observed compared to the glasses, in agreement with offset of micas relative to anhydrous glasses reported by Pabst et al (2012) and De Hoog et al (2017).…”

Section: Methodsmentioning

confidence: 99%

Boron isotope record of peak metamorphic ultrahigh-pressure and retrograde fluid–rock interaction in white mica (Lago di Cignana, Western Alps)

Halama

Konrad‐Schmolke

Hoog³

2020

Contrib Mineral Petrol

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This study presents boron (B) concentration and isotope data for white mica from (ultra)high-pressure (UHP), subductionrelated metamorphic rocks from Lago di Cignana (Western Alps, Italy). These rocks are of specific geological interest, because they comprise the most deeply subducted rocks of oceanic origin worldwide. Boron geochemistry can track fluidrock interaction during their metamorphic evolution and provide important insights into mass transfer processes in subduction zones. The highest B contents (up to 345 μg/g B) occur in peak metamorphic phengite from a garnet-phengite quartzite. The B isotopic composition is variable (δ 11 B = − 10.3 to − 3.6%) and correlates positively with B concentrations. Based on similar textures and major element mica composition, neither textural differences, prograde growth zoning, diffusion nor a retrograde overprint can explain this correlation. Modelling shows that B devolatilization during metamorphism can explain the general trend, but fails to account for the wide compositional and isotopic variability in a single, well-equilibrated sample. We, therefore, argue that this trend represents fluid-rock interaction during peak metamorphic conditions. This interpretation is supported by fluid-rock interaction modelling of boron leaching and boron addition that can successfully reproduce the observed spread in δ 11 B and [B]. Taking into account the local availability of serpentinites as potential source rocks of the fluids, the temperatures reached during peak metamorphism that allow for serpentine dehydration, and the high positive δ 11 B values (δ 11 B = 20 ± 5) modelled for the fluids, an influx of serpentinite-derived fluid appears likely. Paragonite in lawsonite pseudomorphs in an eclogite and phengite from a retrogressed metabasite have B contents between 12 and 68 μg/g and δ 11 B values that cluster around 0% (δ 11 B = − 5.0 to + 3.5). White mica in both samples is related to distinct stages of retrograde metamorphism during exhumation of the rocks. The variable B geochemistry can be successfully modelled as fluid-rock interaction with low-to-moderate (< 3) fluid/rock ratios, where mica equilibrates with a fluid into which B preferentially partitions, causing leaching of B from the rock. The metamorphic rocks from Lago di Cignana show variable retention of B in white mica during subduction-related metamorphism and exhumation. The variability in the B geochemical signature in white mica is significant and enhances our understanding of metamorphic processes and their role in element transfer in subduction zones.

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“…So far, geochemical estimation of traceelement property of fluids from jadeitite are based on experimental data of diopsidic clinopyroxene instead of jadeitic pyroxene. A large amount of data via quick and precise in-situ analytical techniques (e.g., Martin et al, 2015;Kimura et al, 2016) and new experimental data will allow to a statistical-mechanical study to decipher fluid evolution in subduction zone system.…”

Section: Perspectivesmentioning

confidence: 99%

Jadeitite (jadeite jade) from Japan: History, characteristics, and perspectives

Tsujimori

Harlow

2017

Journal of Mineralogical and Petrological Sciences

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Jadeitite, known as 'hisui' in Japan, has been esteemed as sacred stone in both ancient and modern Japanese cultures. Although it was thought that the source material of Japanese jadeitite was brought from China, the identification of jadeite in 1939 changed this interpretation. Japanese jadeitites and jadeite-rich metasomatic rocks are found in Paleozoic and also Mesozoic geotectonic units. All localities are situated in serpentinite mélange with high-pressure metamorphic rocks and/or serpentinite lenses within a high-pressure metamorphosed complex. Outcrop exposures of contact between jadeitite and host serpentinite are extremely rare. Normally the jadeitites show lithological heterogeneity in the same locality due to multiple deformation, recrystallization, and metasomatic fluid infiltration. Studies over the last two decades have interpreted jadeitite in worldwide either as the direct aqueous fluid precipitate (P-type) from subduction channel into the overlying mantle wedge, as the metasomatic replacement (R-type) by such fluids of oceanic plagiogranite, graywacke, or metabasite along the channel margin, or a combination of these two processes. Japanese jadeitites are classified into one or the other type. Multiple stable isotope characterization analyses for jadeitite and related metasomatic rocks and serpentinite become increasingly important to decode fluid behaviors in past subduction zone. However, available geochemical data on Japanese jadeitite are very limited in comparison with other studied localities. More systematic research will unlock new insights about fluid flow and its impacts at the bottom of forearc mantle where jadeitites form. Chemical differentiation and transportation of the fluids involved in jadeititeformation are crucial topics requiring further research. Nevertheless, the designation of jadeite (and jadeitite) as the national stone of Japan by the Japan Association of Mineralogical Sciences in 2016 should bolster education of the public about this revered stone and its role in subduction zone processes.

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In situ lithium and boron isotope determinations in mica, pyroxene, and serpentine by LA-MC-ICP-MS

Cited by 42 publications

References 40 publications

Boron isotopic discrimination for subduction-related serpentinites

Boron isotopic discrimination for subduction-related serpentinites

Boron isotope record of peak metamorphic ultrahigh-pressure and retrograde fluid–rock interaction in white mica (Lago di Cignana, Western Alps)

Jadeitite (jadeite jade) from Japan: History, characteristics, and perspectives

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