Special issue ‘Geofluid processes in subduction zones and mantle dynamics’

Kawamoto, Tatsuhiko; Nakajima, Jun; Reynard, Bruno; Toh, Hiroaki

doi:10.1186/s40623-015-0209-z

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…Volatiles are continuously expelled from the mantle via volcanic activity while being simultaneously transported into the mantle at subduction zones (e.g., Barnes et al, ; Hilton et al, ; Holland & Ballentine, ; Ito et al, ; Kendrick et al, ; Schilling et al, ). Since even a relatively small addition of volatiles may result in major changes to the chemical and physical properties of mantle rocks, understanding volatile recycling processes is critical for gaining insights into mantle heterogeneity and its temporal evolution (e.g., Bolfan‐Casanova, ; Holland & Ballentine, ; Kawamoto et al, ; Kendrick et al, ). However, critical questions remain over the quantity of volatiles being subducted, how they are transported, and the mechanism of their incorporation into the mantle (e.g., Barnes et al, ; Chavrit et al, ; Hilton et al, ; Holland & Ballentine, ; Ito et al, ; Kendrick et al, ; Kobayashi et al, ; van Keken et al, ).…”

Section: Introductionmentioning

confidence: 99%

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Kobayashi

Sumino

Burgess

et al. 2019

Geochem Geophys Geosyst

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We present halogen, noble gas, and major and trace element compositions of mantle xenoliths from intraplate settings (Eifel, Kilbourne Hole, San Carlos, and Hawaii). The xenoliths show a wide range of halogen elemental ratios, which form two arrays centered on the halogen composition of mid-ocean ridge basalts. The samples on the array toward high I/Cl value have relatively low Cl concentration and low ratios of highly incompatible elements relative to heavy rare earth elements, whereas the samples on the array toward low Br/Cl value have higher Cl concentration and trace elements ratios. The detailed mechanisms to account for these signatures are equivocal at present. However, they are most likely to be related to secondary processes of volatile loss during partial melting and secondary phase formation during interaction with melts. The common primary mid-ocean ridge basalt-like halogen ratios in mantle xenoliths from different parts of the globe indicate that the mantle itself must have a relatively uniform composition over a wide scale. The mantle has maintained its halogen composition over billion year timescales without being affected by I-rich halogens being transported into the mantle. Mass balance calculations suggest that, in order to maintain the I/Cl ratio of the convecting mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value. Plain Language Summary Elemental and isotopic compositions of volatile species such ashalogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine-rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value.

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Section: Introductionmentioning

confidence: 99%

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Kobayashi

Sumino

Burgess

et al. 2019

Geochem Geophys Geosyst

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“…'Geofluid' has recently attracted the attention of geoscientists because it drastically changes the physical and chemical properties of rocks and affects various geological phenomena, including earthquake activity, magma generation, and ore deposit formation (e.g., Yardley and Bodnar, 2014;Kawamoto et al, 2015). The microstructures and chemical compositions of vein-filling minerals, such as calcite and quartz, are particularly well known as indicators of the fluid characteristics, deformation kinematics, and paleo-stress field (e.g., Nishikawa and Takeshita, 2000;Bons et al, 2012;Okamoto, 2014).…”

Section: Introductionmentioning

confidence: 99%

Microstructural observations of fracture–filling goethite vein along the Kerajang Fault Zone in the Rengali Province of eastern India

Yamamoto

Ando

Tomioka

et al. 2017

Journal of Mineralogical and Petrological Sciences

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Microstructural observations and chemical composition analyses of a fracture-filling goethite vein in quartzite bands adjacent to a terrain-boundary fault zone were carried out, primarily using electron microscopy, to determine its formation process. Two domains A and B were identified, based on microstructural and chemical characteristics. The domain A formed a layered structure characterized by goethite grains with higher Al contents, smaller grain size (several hundred nanometers to micrometers in size), with development of the strong shape-and lattice-preferred orientations (SPO and LPO) of [020] and [110] along the wall rock contact, whereas the inner region had lower Al contents with larger grain size (several micrometers in size). The domain B exhibited concentric zoning characterized by variation in chemical composition, grain-size grading approximately ten to several tens of nanometers in size, a change in the porosity, and the alignment of goethite [110] perpendicular to the zoning plane. The grain size distribution and development of SPO and LPO in domain A can be explained by the inhibition of crystal growth (due to the incorporation of Al 3+ instead of Fe 3+ ) and geometrical selection, respectively. Two possible formation processes for domain B can be proposed based on the analogy of chalcedony; precipitation of goethite colloidal particles with electrophoretic force or heterogeneous nucleation from the Fe-rich supersaturated fluid and subsequent crystal growth. The study results suggest that the goethite vein was formed by multiple stages of Fe-rich fluid infiltration, which may have been derived from the Banded Iron Formation in the Singhbhum cratonic crust related to the activation of the Kerajang Fault Zone.

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Specifying and estimating the distribution of aqueous fluids and melts in Earth's crust and upper mantle (hereafter referred to as geofluids) and lithologies is essential for understanding various geodynamic processes, including seismicity, magma generation, and resource formation (e.g., Abers et al, 2006;Hacker et al, 2003;Kawamoto et al, 2015;Peacock, 1990). Geophysical observations, such as seismic velocity and electrical conductivity, are two of the most important clues for determining spatial distributions.

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confidence: 99%

Bayesian Inversion of Lithology and Liquid Phase Parameters From Seismic Velocity and Electrical Conductivity in the Crust and Uppermost Mantle

Kuwatani,

Nagata,

Sakai

et al. 2023

JGR Solid Earth

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To deeply understand various geodynamic processes, including volcanic activities and earthquakes, it is essential to extract detailed information about Earth materials, such as lithology and geofluid, from geophysical, petrological, and geochemical observations of Earth's interior. We developed a Bayesian probabilistic framework that can estimate the lithology and geofluid type (aqueous fluid or melt), geofluid amount (porosity), and parameters related to the fluid geometry (aspect ratio and critical fluid fraction related to connectivity) from P‐wave and S‐wave seismic velocities and electrical conductivity data obtained from geophysical tomography. By conducting synthetic inversion tests, we showed that methods based on a joint probability distribution, which simultaneously determines all parameters, sometimes fail to narrow the number of possible answers from 78 lithologies (e.g., basalt, granite, and eclogite) × two geofluid type (melt or aqueous fluid) candidate sets. This failure is derived directly from the difficult nature of inversion problems with relatively large data uncertainties. The proposed method uses a marginalization technique that first estimates lithology and geofluid type and then quantifies geofluid parameter values, which can narrow the probable lithology, geofluid type, and geofluid parameter sets in many cases. In addition, the computational cost of the proposed marginalization method is comparative to a former joint‐estimation method, which is theoretically identical to a previous heuristic method based on the least squares method. Therefore, the marginalization method is useful for geophysical data analyses that involve large amounts of observational data with relatively large uncertainties.

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Special issue ‘Geofluid processes in subduction zones and mantle dynamics’

Cited by 8 publications

References 46 publications

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Microstructural observations of fracture–filling goethite vein along the Kerajang Fault Zone in the Rengali Province of eastern India

Bayesian Inversion of Lithology and Liquid Phase Parameters From Seismic Velocity and Electrical Conductivity in the Crust and Uppermost Mantle

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