Influence of subduction zone settings on the origin of forearc fluids: Halogen concentrations and 129I/I ratios in waters from Kyushu, Japan

Tomaru, Hitoshi; Ohsawa, Shinji; Amita, Kazuhiro; Lu, Zunli; Fehn, Udo

doi:10.1016/j.apgeochem.2006.12.014

Cited by 14 publications

(13 citation statements)

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“…In addition to the data from New Zealand, we have results from the terrestrial fore arc in Southern Japan (Tomaru et al, 2007b), the marine section of the Central American Arc and the fore arc in Northern Japan (Chiba; Muramatsu et al, 2001). In all of these cases, the ratios are at or below 200 × 10 − 15 , giving ages of 45 Ma or older.…”

Section: Discussionmentioning

confidence: 97%

“…The two curves indicate the expected ratios for the oldest sediments (min) and integrated over the entire sediment column (int). (1) Central America, main arc ; (2) New Zealand, main arc ; (3) New Zealand, fore arc (this study); (4) S. Japan, main arc ; (5) S. Japan, fore arc (Tomaru et al, 2007b); (6) Andes, main arc ); (7) N Japan, fore arc (Muramatsu et al, 2001); (8) Central America, fore arc ; (9) Nankai, hydrates ; (10) Peru margin, hydrates (this study). and 5 Ma.…”

Section: Discussionmentioning

confidence: 99%

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Iodine as a tracer of organic material: 129I results from gas hydrate systems and fore arc fluids

Fehn

Snyder

Muramatsu

2007

Journal of Geochemical Exploration

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Iodine as a tracer of organic material: 129I results from gas hydrate systems and fore arc fluids

Fehn

Snyder

Muramatsu

2007

Journal of Geochemical Exploration

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“…Sample number 6 from area B contained detectable (Figure 4b), which gives iodine ages of 36 to 46 Ma. We neglect fissiogenic 129 I produced by spontaneous fission of 238 U because its influence is small (Fehn et al 2000;Tomaru et al 2007aTomaru et al , c, 2009a. The homogeneity of iodine age (39 ± 4 Ma) suggests that the source of iodine is limited.…”

Section: Resultsmentioning

confidence: 99%

“…According to Muramatsu and Wedepohl (1998), the largest reservoir of iodine in the earth's crust is in ocean sediments. Iodine-rich brine is often generated in forearc and back-arc areas and passive continental margins (Muramatsu et al 2001;Tomaru et al 2007aTomaru et al , b, c, 2009aFehn et al 2003Fehn et al , 2007aFehn 2012). Fehn (2012) reported that the iodine-rich fluids in the forearc regions in several subduction zones have iodine ages of about 40 to 60 Ma regardless of the ages of the subducting slab and proposed that the ages represent 'a global pattern of migration of fluids from deep, old layers located in the upper plates.'…”

Section: Introductionmentioning

confidence: 99%

Groundwater, possibly originated from subducted sediments, in Joban and Hamadori areas, southern Tohoku, Japan

et al. 2014

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We studied the origin of deep groundwater in the Joban and Hamadori areas in southern Tohoku, Japan, based on δD, δ 18 O, 129I/I, 36 Cl/Cl, and 3 H concentrations. Deep groundwater was collected from the basement rocks (Cretaceous granite) and from the margin of the Joban sedimentary basin (latest Cretaceous to Quaternary sedimentary rocks deposited on the basement rocks). We sampled groundwater pumped from depths ranging from 350 to 1,600 m in these areas. A hypothetical end-member of deep groundwater was estimated from the relationship between δ 18 O and Cl concentrations, and our data reveal a much higher iodine concentration and lower Br and Cl concentrations than found in seawater. The iodine ages inferred from 129 I/I are quite uniform and are about 40 Ma and 36 Cl/Cl almost reached the secular equilibrium. The relationship between iodine and Cl can be explained by mixing a hypothetical end-member with meteoric water or seawater. Moreover, the I/Cl ratio increases linearly with increasing water temperature. The water temperature was high in Joban, with a maximum of 78°C at a depth of 1,100 m. The geothermal gradient in the Joban basin is 18°C km, and the temperature even at a depth of 3 km in the basin was not high enough to supply thermal water to the sampling sites. Thus, sedimentary rocks in the Joban basin are unlikely to be the source of iodine in the deep groundwater. Several active faults such as the Futaba Fault are developed in and around the studied areas. The Iwaki earthquake occurred 1 month after the 2011 Tohoku-oki earthquake, and normal-fault type surface ruptures formed and discharged hot groundwater in Joban. The deep groundwater we studied probably came up through the basement rocks from greater depths. There are no sedimentary rocks younger than Tertiary age beneath the pre-Cretaceous basement rocks, and the subducted sediments in the Japan Trench are a possible source of iodine in the groundwater. The Joban and Hamadori areas may be an ideal window to look into the water circulation in the forearc of the Tohoku subduction zone.

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“…Studied materials are JA-1, JB-3, JG-1, JG-2, JGb-1, JP-1, JR-1, and JR-2 from GSJ, BCR-2, BHVO-2, BIR-1, and RGM-1 from USGS, and original rocks of JB-2, JB-3, JGb-1, JP-1, and JR-1. Tatsumi, 1989;Peacock, 1990;) 。また沈み込むプレートのマントル部分 (スラブマントル)の蛇紋岩化したかんらん岩も水の重要な運び手と考えられている (Ulmer and Trommsdorff, 1995;Iwamori, 1998;Schmidt and Poli, 1998;Rüpke et al, 2004;Hacker, 2008;van Keken et al, 2011 Iwamori, 1998Iwamori, , 2007Schmidt and Poli, 1998;Rüpke et al, 2004;Hacker, 2008;van Keken et al, 2011 (Yoshida et al, 1971;Shinonaga et al, 1994;Ebihara et al, 1997;Michel and Villemant, 2003;Villemant et al, 2008 (Straub and Layne, 2003;Wade et al, 2006;Wysoczanski et al, 2006;Benjamin et al, 2007;Portnyagin et al, 2007;Sadofsky et al, 2008 (Straub and Layne, 2003;Wade et al, 2006;Wysoczanski et al, 2006;Benjamin et al, 2007;Portnyagin et al, 2007;Sadofsky et al, 2008;Le Voyer et al, 2010;Rose-Koga et al, 2012 Cl を用いた研究も行われている( 例えば, Barnes et al, 2008Barnes et al, , 2009 Tomaru et al, 2007) 。これらの試料に (Zaikowski and Schaeffer, 1979;Pyle and Mather, 2009…”

Section: ×10unclassified

Traces of Slab-derived Fluids Revealed by Halogens in Mantle-derived Rocks

Kobayashi

Sumino

Toyama

2015

Journal of Geography(Chigaku Zasshi)

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The distribution and behavior of halogens in the mantle are still poorly understood. Chlorine, bromine, and iodine are highly incompatible and strongly partitioned into fluids, whereas fluorine is partitioned into melts rather than fluids. As a result, during differentiation of the Earth, the former halogens became more abundant in surface reservoirs and scarcer in the mantle. Because their geochemical properties differ, each reservoir has a distinct composition. Therefore, the halogen compositions of mantle-derived materials are expected to enable material exchanges to be traced between the surface of the Earth and its interior, especially water transportation into the mantle accompanying a subducting slab. Exhumed peridotites in metamorphic belts and mantle-derived xenoliths in volcanic rocks can provide intrinsic halogen information on the mantle, whereas halogen compositions in volcanic rocks are changed from those of their mantle source during melting and degassing processes, in which halogen behavior is not well constrained. Very low halogen concentration in mantle-derived materials hampers analyses using conventional methods. Recent progress of analytical techniques involving the noble gas method overcomes such difficulties, making it possible to intensively investigate halogens in mantlederived materials during the last decade. Presented here is a review of studies of halogens in volcanic and mantle-derived rocks and minerals. Recent findings of distinctive Br/Cl and I/Cl ratios in exhumed peridotites in metamorphic belts, mantle xenoliths from arc volcanoes and kimberlites suggest subduction of halogen acquired from sedimentary pore water or crustal brine into the mantle.

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Influence of subduction zone settings on the origin of forearc fluids: Halogen concentrations and 129I/I ratios in waters from Kyushu, Japan

Cited by 14 publications

References 56 publications

Iodine as a tracer of organic material: 129I results from gas hydrate systems and fore arc fluids

Iodine as a tracer of organic material: 129I results from gas hydrate systems and fore arc fluids

Groundwater, possibly originated from subducted sediments, in Joban and Hamadori areas, southern Tohoku, Japan

Traces of Slab-derived Fluids Revealed by Halogens in Mantle-derived Rocks

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