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Equilibrium sulfur isotope fractionations of several important sulfides 几种重要硫化物的平衡硫同位素分馏

IF 0.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0623

Jixi Zhang

Copyright © 2021 by The Geochemical Society of Japan. sulfur isotope analyses have been applied to ore deposits; the pioneers of this subject area are Kulp et al. (1956) and Jensen (1957, 1959), among others. At present, sulfur isotopes are used in the fields of geology (e.g., Shanks et al., 1981), biology (e.g., Rees, 1973; Habicht and Canfield, 1997; Habicht et al., 1998; Bolliger et al., 2001; Brüchert et al., 2001; Detmers et al., 2001) and environmental science (e.g., Harris et al., 2013), etc. Notably, research on the mass-independent fractionation of sulfur is currently the most active topic in the field of sulfur isotope geochemistry (Farquhar et al., 2000, 2001, 2013; Savarino et al., 2003; Subrata et al., 2013). It is well known that equilibrium isotope fractionation can be used to estimate the formation temperature of minerals in geological systems (Urey and Greiff, 1935; Urey, 1947). Isotope geochemistry mainly focuses on the change in the isotope ratio between different species rather than on their absolute abundances. The general rule for isotope fractionation is that heavy isotopes tend to form more stable chemical bonds; for example, M34S is more stable than M32S (M stands for metal cations). When considering kinetic isotope effects, molecules with different isotopes have different reaction rates (O’Neil, 1986). In the case of sulfur, 34S/32S is the key point of interest. In most cases, isotope fractionation is relatively small, and most of the time, the δ notation is used to express isotope fractionation. In this article, only the ratio of 34S/32S is Equilibrium sulfur isotope fractionations of several important sulfides

日本地球化学学会版权所有©2021。硫同位素分析已应用于矿床;这一学科领域的先驱是Kulp等人(1956)和Jensen(1957, 1959)等人。目前，硫同位素应用于地质学(如Shanks等，1981)、生物学(如Rees, 1973;Habicht and Canfield, 1997;Habicht et al.， 1998;Bolliger et al.， 2001;br chert et al.， 2001;Detmers等人，2001年)和环境科学(如Harris等人，2013年)等。值得注意的是，硫的质量无关分馏是目前硫同位素地球化学领域最活跃的研究课题(Farquhar et al.， 2000,2001,2013;Savarino et al.， 2003;Subrata et al.， 2013)。众所周知，平衡同位素分馏可以用来估计地质系统中矿物的形成温度(Urey和Greiff, 1935;尤里,1947)。同位素地球化学主要关注不同物种之间同位素比值的变化，而不是它们的绝对丰度。同位素分馏的一般规律是，重同位素倾向于形成更稳定的化学键;例如，M34S比M32S更稳定(M代表金属阳离子)。在考虑同位素动力学效应时，不同同位素的分子具有不同的反应速率(O 'Neil, 1986)。在硫的情况下，34S/32S是关键的兴趣点。在大多数情况下，同位素分馏相对较小，大多数情况下，δ符号用于表示同位素分馏。在本文中，只有34S/32S的比值是几种重要硫化物的平衡硫同位素分馏

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引用次数: 6

Spatio-temporal changes in the depositional environment of Miocene organic rich mudstones in the Akita Basin deduced from biomarker analysis 基于生物标志物分析的秋田盆地中新世富有机质泥岩沉积环境时空变化

IF 0.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.gj22001

Kenta Asahina, T. Nakajima, Koji U. Takahashi, Miyuki Kobayashi, Y. Hanamura

引用次数: 0

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 GEOCHEMISTRY & GEOPHYSICS

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

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 GEOCHEMISTRY & GEOPHYSICS

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 GEOCHEMISTRY & GEOPHYSICS

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

Application of handheld XRF on Ta-Nb-Sn-W ore: Factory calibration or user calibration? 手持式XRF在Ta-Nb-Sn-W矿石上的应用:工厂校准还是用户校准?

IF 0.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0624

A. Somarin, Li Zhou, Ingo Steinhage

引用次数: 2

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 GEOCHEMISTRY & GEOPHYSICS

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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引用次数: 3

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 GEOCHEMISTRY & GEOPHYSICS

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

Characteristics in trace elements compositions of tephras (B-Tm and To-a) for identification tools 用于鉴定工具的麻黄微量元素组成特征(B-Tm和To-a)

IF 0.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0619

Fumiko Watanabe Nara, T. Yokoyama, S. Yamasaki, M. Minami, Y. Asahara, Takahiro Watanabe, Kazuyoshi Yamada, N. Tsuchiya, Y. Yasuda

Copyright © 2021 by The Geochemical Society of Japan. lacustrine and marine sediments can be preserved well when undisturbed by postdeposition erosion. Multiple dating studies using tephrochronology have been performed on lacustrine and marine sediments (Hopkins et al., 2015; Matsu’ura and Komatsubara, 2017; Sirocko et al., 2013). In order to establish the tephra layer as a robust chronological tool, it is essential to characterize each tephra using multiple approaches, such as morphology, mineralogy and geochemistry. The absolute date of the Millennium Eruption (ME) of Changbaishan Volcano (also referred to as Mt. Paektu, Baekdusan or Tianchi), located at the border between China and North Korea (Fig. 1a), has been defined as AD 946 analyzed by dendrochronological approaches (Hakozaki et al., 2018; Oppenheimer et al., 2017). This date is based on 14C contents in tree rings collected at the foot of Changbaishan Volcano by matching the observed 14C variations against the AD 774–775 14C spike (Miyake Characteristics in trace elements compositions of tephras (B-Tm and To-a) for identification tools

日本地球化学学会版权所有©2021。湖泊和海洋沉积物如果不受沉积后侵蚀的干扰，可以很好地保存下来。利用地表年代学对湖泊和海洋沉积物进行了多次测年研究(Hopkins et al.， 2015;Matsu 'ura and Komatsubara, 2017;Sirocko et al.， 2013)。为了将麻风层建立为可靠的年代工具，必须使用多种方法(如形态学，矿物学和地球化学)表征每个麻风层。位于中朝边境的长白山火山(也被称为白头山、白头山或天池)千年喷发(ME)的绝对日期(图1a)被定义为公元946年，通过树木年代学方法进行了分析(Hakozaki et al.， 2018;Oppenheimer et al.， 2017)。根据在长白山火山脚下采集的树木年轮中14C的含量，将观测到的14C变化与公元774-775年的14C峰值(tephras微量元素组成(B-Tm和To-a)的Miyake特征进行比对，作为鉴定工具

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引用次数: 6

Origin of porphyritic texture by magma mixing in the andesitic rocks of Ghansura Rhyolite Dome from the Bathani volcano-sedimentary sequence, Eastern India 印度东部巴塔尼火山-沉积层序中Ghansura流纹岩丘安山岩中岩浆混合形成的斑岩结构成因

IF 0.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemical Journal

Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0613

Bibhuti Gogoi, G. Hazarika, H. Chauhan

引用次数: 2

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