Competitive hydration and dehydration at olivine–quartz boundary revealed by hydrothermal experiments: Implications for silica metasomatism at the crust–mantle boundary

Oyanagi, Ryosuke; Okamoto, Atsushi; Hirano, Nobuo; Tsuchiya, Noriyoshi

doi:10.1016/j.epsl.2015.05.046

Cited by 18 publications

(4 citation statements)

References 39 publications

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“…3). This is chosen for the following reasons: (1) The diffusional metasomatic zoning of talc and serpentine zones between quartz and olivine has been classically modeled [38][39][40]; (2) this heterogeneous reaction network is relatively simple, but involves the dissolution/precipitation processes of several minerals as well as element diffusion [8,41].…”

Section: An Example Of Parallel Heterogeneous Reactionsmentioning

confidence: 99%

“…Many laboratory experiments have attempted to understand the mechanism of heterogeneous reactions. These experiments typically involve quantitative observations of either (1) the temporal evolution of the concentrations of aqueous species [4][5][6][7], or (2) the spatial distribution of minerals or concentrations of aqueous a e-mail: royanagi@jamstec.go.jp (corresponding author) species at a single time [8][9][10][11]. The reaction rate constant in a reaction pathway can be determined inversely from the former by analyzing the temporal evolution of the solution chemistry and equilibration.…”

Section: Introductionmentioning

confidence: 99%

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Exploration of nonlinear parallel heterogeneous reaction pathways through Bayesian variable selection

2021

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Inversion is a key method for extracting nonlinear dynamics governed by heterogeneous reaction that occur in parallel in the natural sciences. Therefore, in this study, we propose a Bayesian statistical framework to determine the active reaction pathways using only the noisy observable spatial distribution of the solid phase. In this method, active reaction pathways were explored using a Widely Applicable Bayesian Information Criterion (WBIC), which is used to select models within the framework of Bayesian inference. Plausible reaction mechanisms were determined by maximizing the posterior distribution. This conditional probability is obtained through Markov chain Monte Carlo simulations. The efficiency of the proposed method is then determined using simulated spatial data of the solid phase. The results show that active reaction pathways can be identified from the redundant candidates of reaction pathways. After these redundant reaction pathways were excluded, the controlling factor of the reaction dynamics was estimated with high accuracy. Graphic Abstract

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Section: An Example Of Parallel Heterogeneous Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploration of nonlinear parallel heterogeneous reaction pathways through Bayesian variable selection

2021

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“…This system is relatively simple, but it involves the dissolution/precipitation processes of several minerals as well as element diffusion; accordingly, it serves as a good example of reactive transport processes in water-rock interactions. (2) The progress of the metasomatic reaction in the olivine-quartz-H 2 O system was experimentally investigated [43], which is a useful when considering a realistic model. (3) The reaction rate is critical to understanding the various processes in subduction zones, including metamorphism, earthquakes, and volcanism [44,45].…”

Section: Model Systemmentioning

confidence: 99%

Multiple Kinetic Parameterization in a Reactive Transport Model Using the Exchange Monte Carlo Method

2018

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Water-rock interaction in surface and subsurface environments occurs in complex multicomponent systems and involves several reactions, including element transfer. Such kinetic information is obtained by fitting a forward model into the temporal evolution of solution chemistry or the spatial pattern recorded in the rock samples, although geochemical and petrological data are essentially sparse and noisy. Therefore, the optimization of kinetic parameters sometimes fails to converge toward the global minimum due to being trapped in a local minimum. In this study, we simultaneously present a novel framework to estimate multiple reaction-rate constants and the diffusivity of aqueous species from the mineral distribution pattern in a rock by using the reactive transport model coupled with the exchange Monte Carlo method. Our approach can estimate both the maximum likelihood and error of each parameter. We applied the method to the synthetic data, which were produced using a model for silica metasomatism and hydration in the olivine-quartz-H 2 O system. We tested the robustness and accuracy of our method over a wide range of noise intensities. This methodology can be widely applied to kinetic analyses of various kinds of water-rock interactions.2 of 15 happen simultaneously. Even for monomineralic systems, such as feldspar-water or olivine-water systems in batch experiments, coupled reactions could occur, marked by the dissolution of the primary mineral and the formation of a secondary mineral [9,[20][21][22][23]. Accordingly, an effective methodology is required to simultaneously estimate the reaction-rate constants of several minerals and/or diffusivity of elements from complex water-rock systems.However, multiple parameterizations from a coupled transport and reaction system, pertaining to the dissolution and precipitation of many minerals and the transport of aqueous species (ions and complexes), raise a difficult geochemical inverse problem due to computational difficulties. This is especially true when multiple parameters are to be estimated; estimation sometimes fails to converge to the global minima due to convergence to the local minima through error minimization [24,25]. Moreover, the data used for parameterization may be "noisy" due to analytical uncertainties, and therefore, the fitted parameters would also contain errors. Such errors on rate constants are typically ignored to avoid the complex computations required to handle error propagation. Therefore, it would be ideal to develop a versatile method that can extract multiple kinetic parameters and associated errors from noisy laboratory datasets without becoming trapped in local minima.In this study, we present a novel method to estimate not only multiple reaction-rate constants, but also the diffusivity of aqueous species using only the dataset of spatial mineral distribution, and by combining the reactive transport model and the exchange Monte Carlo (EMC) method [26][27][28]. The latter is well-known as an improvement on Markov chain Monte Carlo (MCMC) ...

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“…During last two decades, serpentinite and serpentinization of mantle peridotite have received much attention for their important roles in mineralogical, geochemical, and seismological processes (e.g., Evans et al, 2013;Oyanagi et al, 2015;Plümper et al, 2017;Yamada et al, 2019a). One of those notable roles played by serpentinites is their contribution on discussing the fluid-mediated material transfer at convergent plate boundaries.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Pb isotope signatures of Ni–Fe alloy hosted by antigorite serpentinite from the Josephine Ophiolite, USA

Kakefuda

Tsujimori

Yamashita

et al. 2020

Journal of Mineralogical and Petrological Sciences

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Awaruite (Ni 2-3 Fe) is a natural occurring Ni-Fe alloy in serpentinite, which represents a better candidate to assess Pb isotope signatures in the mantle wedge since the concentration of Pb in awaruite is almost ten times higher than that in serpentine minerals. Revisiting so-called josephinite from the Josephine Ophiolite confirmed that josephinite is characterized by aggregates of awaruite with minor Ni-arsenide. The Raman spectrum obtained from the josephinite-hosting serpentinite shows diagnostic peaks of antigorite, suggesting josephinite might have formed under stability field of antigorite. Using a stepwise leaching and partial dissolution method, we obtained Pb isotope ratios of josephinite by TIMS. Since all ratios converged to a homogeneous value towards the later steps of the partial dissolution, this allowed to calculate weighted mean values that give precise Pb isotope ratios: 206 Pb/ 204 Pb = 18.3283 ± 0.0020 (MSWD = 0.49), 207 Pb/ 204 Pb = 15.5645 ± 0.0020 (MSWD = 0.36), and 208 Pb/ 204 Pb = 38.0723 ± 0.0061 (MSWD = 0.50); these values can be evaluated as one of the reference Pb isotope ratios in serpentinites from supra-subduction zone ophiolite. The newly obtained Pb isotope ratios of josephinite are consistent with the previous reported isotope ratios, which are characterized by enriched 207 Pb/ 204 Pb ratio with MORB-source like 206 Pb/ 204 Pb and 208 Pb/ 204 Pb ratios. Although these Pb isotope features interpreted as a reflection of arc magmatism in the previous study, the presence of Ni-arsenide and enriched 207 Pb/ 204 Pb ratios may indicate an involvement of As-rich fluids derived from slab sediments.

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Competitive hydration and dehydration at olivine–quartz boundary revealed by hydrothermal experiments: Implications for silica metasomatism at the crust–mantle boundary

Cited by 18 publications

References 39 publications

Exploration of nonlinear parallel heterogeneous reaction pathways through Bayesian variable selection

Exploration of nonlinear parallel heterogeneous reaction pathways through Bayesian variable selection

Multiple Kinetic Parameterization in a Reactive Transport Model Using the Exchange Monte Carlo Method

Revisiting Pb isotope signatures of Ni–Fe alloy hosted by antigorite serpentinite from the Josephine Ophiolite, USA

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