Geochemical Journal最新文献

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High-precision Δ′17O measurements of geothermal H2O and MORB on the VSMOW-SLAP scale: evidence for active oxygen exchange between the lithosphere and hydrosphere 在VSMOW-SLAP尺度上对地热水和MORB的高精度Δ’17O测量:岩石圈和水圈之间活氧交换的证据

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0644

Takashi Sambuichi, U. Tsunogai, Kazushige Kura, F. Nakagawa, T. Ohba

have reported 17O-depletion in terrestrial silicates compared with that in hydrospheric H2O such as seawater and meteoric water (Pack et al., 2016; Sharp et al., 2016). The ∆′17O value of mantle-derived silicates ranges from –70 to –30 × 10−6; however, the mean ∆′17O value of meteoric water is +33 × 10−6 and that of seawater collected at various depths is –5 ± 1 × 10−6 (Luz and Barkan, 2010). This difference in ∆′17O between the lithosphere and hydrosphere has been explained by kinetic fractionation of oxygen isotopes during degassing from the magma ocean on the early primitive earth (Tanaka and Nakamura, 2013) or oxygen isotope exchange between the seawater and lithospheric components such as seafloor basalt and continental crust (Pack and Herwartz, 2014; Sengupta et al., 2020; Sengupta and Pack, 2018). The latter explanation has been proposed on the basis of findings that the equilibrium fractionation exponent θ [=ln17α/ln18α; αA-B = RA/ RB where iR corresponds to the abundance ratio of the heavy isotope (iO where i = 17 or 18) to the light isotope (16O).] between silicates and H2O is a funcHigh-precision ∆′17O measurements of geothermal H2O and MORB on the VSMOW-SLAP scale: evidence for active oxygen exchange between the lithosphere and hydrosphere

已经报道了与海水和大气水等水圈H2O相比，陆相硅酸盐的17o损耗(Pack et al.， 2016;Sharp et al.， 2016)。地幔源硅酸盐的∆′17O值为-70 ~ -30 × 10−6;而大气水的平均∆′17O值为+33 × 10−6，不同深度海水的平均∆′17O值为-5±1 × 10−6 (Luz和Barkan, 2010)。早期原始地球岩浆海洋脱气过程中氧同位素的动力学分选(Tanaka and Nakamura, 2013)或海水与海底玄武岩和大陆地壳等岩石圈组分之间的氧同位素交换(Pack and Herwartz, 2014;Sengupta等人，2020;Sengupta和Pack, 2018)。后一种解释是基于平衡分馏指数θ [=ln17α/ln18α;αA-B = RA/ RB，其中iR对应重同位素(iO, i = 17或18)与轻同位素(16O)的丰度比。在VSMOW-SLAP尺度上对地热H2O和MORB的高精度∆′17O测量:岩石圈和水圈之间的活氧交换的证据

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引用次数: 3

Application of B and Li isotope systematics for detecting chemical disturbance in groundwater associated with large shallow inland earthquakes in Kumamoto, Japan B、Li同位素系统在熊本内陆大浅层地震地下水化学扰动探测中的应用

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0633

M. Tanimizu, N. Sugimoto, T. Hosono, C. Kuribayashi, T. Morimoto, A. Ito, R. Umam, Y. Nishio, K. Nagaishi, T. Ishikawa

Copyright © 2021 by The Geochemical Society of Japan. caused by such contamination is sometimes enhanced by anthropogenic activities such as excessive pumping of groundwater (Smith et al., 2018; Jasechko et al., 2020). In addition, natural disasters such as large earthquakes can also trigger these problems. By analyzing the major ion concentrations, trace element concentrations, and stable isotope ratios of water molecules, several studies have described changes in the natural composition of groundwater in response to seismotectonic activities (Tsunogai and Wakita, 1995; Manga and Rowland, 2009; Barberio et al., 2017; Skelton et al., 2019). However, these changes have been rarely described using stable isotope ratios of dissolved trace elements (Poitrasson et al., 1999; Schuessler et al., 2016). The detailed mechanisms and processes of hydrochemical changes in the regional groundwater system of Kumamoto region of southern Japan in response to the Mw 7.0 Kumamoto crustal earthquake of 2016 were previously investigated using a high-resolution well monitoring network. The results suggested that a co-seismic groundwater drawdown surrounding the epicenter was Application of B and Li isotope systematics for detecting chemical disturbance in groundwater associated with large shallow inland earthquakes in Kumamoto, Japan

日本地球化学学会版权所有©2021。这种污染造成的污染有时会因人为活动而加剧，例如过度抽取地下水(Smith等人，2018;Jasechko et al.， 2020)。此外，大地震等自然灾害也会引发这些问题。通过分析水分子的主要离子浓度、微量元素浓度和稳定同位素比率，一些研究描述了地下水自然组成对地震构造活动的变化(Tsunogai和Wakita, 1995;Manga and Rowland, 2009;Barberio et al.， 2017;Skelton et al.， 2019)。然而，很少使用溶解微量元素的稳定同位素比率来描述这些变化(Poitrasson等人，1999;Schuessler et al.， 2016)。利用高分辨率井监测网络，研究了2016年日本南部熊本地区7.0级地震后地下水系统水化学变化的详细机制和过程。应用B、Li同位素系统检测熊本地区内陆大浅层地震地下水化学扰动

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引用次数: 3

Gold-coated silver capsule for elemental analyzer-isotope ratio mass spectrometer: Robust against pretreatment of rock material for organic carbon and δ13C analyses 用于元素分析仪-同位素比质谱仪的金包银胶囊:对岩石材料预处理有机碳和δ13C分析具有强大的抗氧化能力

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0626

Y. Matsui, Wataru Fujisaki, J. Torimoto, Keiko Tanaka, M. Nishizawa, M. Yamamoto, S. Kawagucci, Y. Shimane, Mika Tei, K. Uematsu, Akihiro Tame, Y. Kawahito, T. Kameda

Fujisaki et al., 2016, 2018, 2019). To prepare the samples for OC analysis with EA-IRMS, coexisting carbonate minerals need to be removed to ensure accurate and precise quantification. For example, for a sediment sample that contains 1 wt% OC and 1 wt% carbonate derived C, the total C would be 2 wt% and the δCtotal C of the non-acidified (non-decalcified) sample would be about –11‰, since the δCorg of a typical pelagic sediment is about –22‰ while the δCcarbonate of benthic foraminifera is about 0‰. In this case, the δCtotal C value cannot be used as a proxy for the δCorg. Several approaches have been proposed for removing carbonate minerals, such as acid treatment using either hydrochloric, phosphoric, or sulfurous acid (Al-Aasm et al., 1990; Brodie et al., 2011) and the stepwise combustion method (Uchida et al., 2008). Acid treatment can be Gold-coated silver capsule for elemental analyzer-isotope ratio mass spectrometer: Robust against pretreatment of rock material for organic carbon and δ13C analyses

Fujisaki et al.， 2016, 2018, 2019)。为了准备样品进行EA-IRMS OC分析，需要去除共存的碳酸盐矿物，以确保准确和精确的定量。例如，对于含有1 wt% OC和1 wt%碳酸盐衍生C的沉积物样品，总C为2 wt%，而非酸化(非脱钙化)样品的δCtotal C约为-11‰，因为典型的远洋沉积物的δ cgc约为-22‰，而底栖有孔虫的δ c酸盐约为0‰。在这种情况下，δCtotal C值不能作为δCorg的代表。已经提出了几种去除碳酸盐矿物的方法，例如使用盐酸、磷酸或硫酸进行酸处理(al - aasm等人，1990年;Brodie et al.， 2011)和逐步燃烧法(Uchida et al.， 2008)。酸处理可用于元素分析仪-同位素比质谱仪的金包银胶囊:对岩石材料的预处理具有很强的抗氧化性，可用于有机碳和δ13C分析

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引用次数: 1

Geochemical characteristics of paleotsunami deposits from the Shizuoka plain on the Pacific coast of middle Japan 日本中部太平洋沿岸静冈平原古海啸沉积地球化学特征

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0641

Takahiro Watanabe, N. Tsuchiya, A. Kitamura, S. Yamasaki, Fumiko Nara W.

Copyright © 2021 by The Geochemical Society of Japan. (Mw) of past earthquakes have been previously estimated using geological records (Minoura et al., 1994; Nanayama et al., 2003; Goto et al., 2014; Chagué-Goff et al., 2015; Sawai et al., 2009, 2012, 2015). An event deposit is preliminarily found using grain size changes in a geologic stratum along with multiple other proxies for environmental changes (Watanabe et al., 2020). Additionally, geochemical analysis is widely used to estimate the source of the sediments (Minoura and Nakaya, 1991; Chagué-Goff et al., 2017). Following recent major subduction zone earthquakes, the analysis of tsunami deposits has been increasing to help clarify such geochemical features (Chagué-Goff et al., 2017; Watanabe et al., 2020). The geochemical signatures of tsunami deposits from the southwestern coasts of Spain, New Zealand, the Hawaiian Islands, Mexico and northeastern Japan have also been studied (Minoura et al., 1994; ChaguéGoff, 2010; Roy et al., 2012; Kuwatani et al., 2014; Yamasaki et al., 2015; Goff et al., 2020). Recently, geochemical characteristics of tsunami deposits have been well documented on the Pacific coast in the Tohoku Geochemical characteristics of paleotsunami deposits from the Shizuoka plain on the Pacific coast of middle Japan

日本地球化学学会版权所有©2021。(Mw)以前已经利用地质记录估计了过去地震的强度(Minoura et al.， 1994;Nanayama et al.， 2003;Goto et al.， 2014;chagu - goff et al.， 2015;Sawai等人，2009,2012,2015)。事件矿床是利用地层粒度变化以及多种其他环境变化指标初步发现的(Watanabe et al.， 2020)。此外，地球化学分析被广泛用于估计沉积物的来源(Minoura和Nakaya, 1991;chagu - goff et al.， 2017)。在最近的主要俯冲带地震之后，对海啸沉积物的分析一直在增加，以帮助阐明此类地球化学特征(chagu - goff等，2017;Watanabe等人，2020)。对西班牙西南海岸、新西兰、夏威夷群岛、墨西哥和日本东北部海啸沉积物的地球化学特征也进行了研究(Minoura et al.， 1994;ChagueGoff, 2010;Roy et al.， 2012;Kuwatani et al.， 2014;Yamasaki et al.， 2015;Goff等人，2020)。近年来，日本中部太平洋沿岸静冈平原古海啸沉积物的地球化学特征在东北地区得到了较好的记录

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引用次数: 2

Role of viscous swirling in the formation of magnetite ocelli or fleck structure in the migmatites of Shillong Plateau Gneissic Complex, eastern India 黏性旋流在印度东部西隆高原片麻岩杂岩中磁铁矿ococelli或斑点结构形成中的作用

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0643

Bibhuti Gogoi, G. Hazarika, H. Chauhan, Sowrav Saikia

引用次数: 1

Constraints of the geochemical characteristics of apatite on uranium mineralization in a uraninite-rich quartz vein in the Haita area of the Kangdian region, China 康店地区海塔地区富铀矿石英脉磷灰石地球化学特征对铀矿化的制约

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0638

Minghui Yin, Zhengqi Xu, Hao Song, Chengjiang Zhang, Suheng Zhang, Jianmin Tian, Hu Guo

引用次数: 3

High-throughput isotope analysis of sub-nanogram sized lead using MC-ICP-MS with on-line thallium doping technique and desolvating nebulizer system 利用MC-ICP-MS在线铊掺杂技术和脱溶雾化系统对亚纳克级铅进行高通量同位素分析

IF 0.8 4区地球科学 Q3 Earth and Planetary Sciences

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0612

K. Nagaishi, R. Nakada, T. Ishikawa

Copyright © 2021 by The Geochemical Society of Japan. Hattori et al., 2017). However, both the ion detection yield and gain of the MIC detector can change through the long term continuous detection of analytes, and thus, careful monitoring and calibration of gain are necessary to achieve accurate analyses (Paul et al., 2005; Kent, 2008). The development of more convenient, precise isotope analysis of small-sized Pb samples still has great significance in terms of analyses of a large number of samples in geological, geochemical, and environmental studies. The MC-ICP-MS method with thallium (Tl) doping technique (e.g., Hirata, 1996; Collerson et al., 2002; Kamenov et al., 2004; Tanimizu and Ishikawa, 2006) has excellent potential to be used for this purpose. In this method, Pb sample solution doped with a standard Tl is used, and the measured 205Tl/203Tl ratios are utilized for the correction of mass discrimination effects for Pb isotopes during MC-ICP-MS analyses. Precise isotope analysis of sub-nanogram sized Pb sample is potentially achievable by the use of amplifiers with higher resistor and desolvating nebulizer system, which increases electrical signal/noise ratios and sample introduction efficiency, respectively. However, combined use of Tl doping technique and desolvating nebulizer system is not well established. This is because gradual oxidation of Tl+ to Tl3+ occurs under the presence of Pb2+, which causes a change of mass bias factor for Tl isotopes mainly due to preferential transmission of Tl isotopes through the desolvating process (Kamenov et al., 2004). To prevent this effect, Pb isotope measurement must be carried out within an hour after the Tl doping (Kamenov et al., 2004). OtherHigh-throughput isotope analysis of sub-nanogram sized lead using MC-ICP-MS with on-line thallium doping technique and desolvating nebulizer system

日本地球化学学会版权所有©2021。Hattori等人，2017)。然而，通过对分析物的长期连续检测，MIC检测器的离子检测产率和增益都可能发生变化，因此，为了实现准确的分析，需要仔细监测和校准增益(Paul et al.， 2005;肯特,2008)。开发更方便、更精确的小尺寸Pb样品同位素分析方法，对于地质、地球化学和环境研究中大量样品的分析仍具有重要意义。采用铊掺杂技术的MC-ICP-MS方法(例如，Hirata, 1996;Collerson et al.， 2002;Kamenov et al.， 2004;Tanimizu and Ishikawa, 2006)具有用于此目的的极好潜力。在该方法中，使用掺杂标准Tl的Pb样品溶液，并利用测量的205Tl/203Tl比例来校正MC-ICP-MS分析中Pb同位素的质量分辨效应。通过使用具有更高电阻的放大器和脱溶雾化器系统，可以实现亚纳克大小的Pb样品的精确同位素分析，从而分别提高电信号/噪声比和样品引入效率。然而，Tl掺杂技术与脱溶雾化器系统的结合使用还没有很好的建立起来。这是因为在Pb2+的存在下，Tl+逐渐氧化为Tl3+，这导致Tl同位素的质量偏差因子发生变化，这主要是由于Tl同位素在脱盐过程中优先传输(Kamenov et al.， 2004)。为了防止这种影响，必须在Tl掺杂后一小时内进行铅同位素测量(Kamenov et al.， 2004)。利用MC-ICP-MS在线铊掺杂技术和脱溶雾化系统对亚纳克级铅进行高通量同位素分析

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