Pub Date : 2023-01-01DOI: 10.2343/geochemj.gj23008
M. Kusakabe, O. Sato
{"title":"Geochemistry and stable isotopic variations of water and dissolved sulfate from landslide areas in Niigata and Nagano Prefectures, Japan. A case study","authors":"M. Kusakabe, O. Sato","doi":"10.2343/geochemj.gj23008","DOIUrl":"https://doi.org/10.2343/geochemj.gj23008","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85182836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2343/geochemj.gj23012
Masaya Takabayashi, Yuta Hirakawa, T. Kakegawa, Y. Furukawa
{"title":"Abiotic formation of ribose 5′-phosphate from ribose and apatite with carbonate- and formate-rich solutions","authors":"Masaya Takabayashi, Yuta Hirakawa, T. Kakegawa, Y. Furukawa","doi":"10.2343/geochemj.gj23012","DOIUrl":"https://doi.org/10.2343/geochemj.gj23012","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78634909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2343/geochemj.gj23016
Bidisha Dey, Tomoyuki Shibata, Masako Yoshikawa
A single column separation method has been developed for the determination of radiogenic 143Nd/144Nd ratios for natural geological samples. Conventional radiogenic Nd isotope ratio measurements require rigorous column chemistry involving multiple steps to extract a pure Nd fraction. Elements that cause isobaric interference during analysis are removed using a multi-column separation method, which is often time consuming and/or expensive. In this work, we use a single cation exchange column to extract a Nd fraction, and a novel method of mass fractionation correction to circumvent the isobaric effect of Sm during analysis. The developed method allows accurate measurement of the 143Nd/144Nd ratio without the elimination of Sm. The ratio of two non-radiogenic Nd isotopes with no natural isobars, 145Nd/146Nd, is used to correct for instrumental mass fractionation on 143Nd/146Nd. The corrected 143Nd/146Nd ratios can be converted to the 143Nd/144Nd form using the conventionally used constant ratio of 146Nd/144Nd of 0.721900, allowing direct comparison with published literature and databases. We have implemented this sample preparation scheme to generate accurate and precise radiogenic 143Nd/144Nd ratios for nine natural reference materials including basalts, granites, sediments and sedimentary rocks, confirming the applicability and robustness of this technique.
{"title":"Single Column REE Separation and Radiogenic <sup>143</sup>Nd/<sup>144</sup>Nd Analysis Without Sm Elimination","authors":"Bidisha Dey, Tomoyuki Shibata, Masako Yoshikawa","doi":"10.2343/geochemj.gj23016","DOIUrl":"https://doi.org/10.2343/geochemj.gj23016","url":null,"abstract":"A single column separation method has been developed for the determination of radiogenic 143Nd/144Nd ratios for natural geological samples. Conventional radiogenic Nd isotope ratio measurements require rigorous column chemistry involving multiple steps to extract a pure Nd fraction. Elements that cause isobaric interference during analysis are removed using a multi-column separation method, which is often time consuming and/or expensive. In this work, we use a single cation exchange column to extract a Nd fraction, and a novel method of mass fractionation correction to circumvent the isobaric effect of Sm during analysis. The developed method allows accurate measurement of the 143Nd/144Nd ratio without the elimination of Sm. The ratio of two non-radiogenic Nd isotopes with no natural isobars, 145Nd/146Nd, is used to correct for instrumental mass fractionation on 143Nd/146Nd. The corrected 143Nd/146Nd ratios can be converted to the 143Nd/144Nd form using the conventionally used constant ratio of 146Nd/144Nd of 0.721900, allowing direct comparison with published literature and databases. We have implemented this sample preparation scheme to generate accurate and precise radiogenic 143Nd/144Nd ratios for nine natural reference materials including basalts, granites, sediments and sedimentary rocks, confirming the applicability and robustness of this technique.","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136256864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2343/geochemj.gj23003
S. Yabusaki, M. Taniguchi, I. Tayasu, T. Akimichi, Noboru Ohmori, Ken Gotou, Hitoshi Watanabe, Souichirou Watanabe, Syuichi Furuya
{"title":"Water quality characteristics and dynamics of groundwater and spring water revealed by multi-tracers in Oshino, Yamanashi, Japan","authors":"S. Yabusaki, M. Taniguchi, I. Tayasu, T. Akimichi, Noboru Ohmori, Ken Gotou, Hitoshi Watanabe, Souichirou Watanabe, Syuichi Furuya","doi":"10.2343/geochemj.gj23003","DOIUrl":"https://doi.org/10.2343/geochemj.gj23003","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76863145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2343/geochemj.gj23006
B. Dey, T. Shibata, M. Yoshikawa
{"title":"Sequential Pb-Sr-LREE separation from silicates for isotopic analysis","authors":"B. Dey, T. Shibata, M. Yoshikawa","doi":"10.2343/geochemj.gj23006","DOIUrl":"https://doi.org/10.2343/geochemj.gj23006","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82654804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2343/geochemj.gj22010
M. Igisu, Y. Takahashi, K. Uematsu, Y. Takeichi, Y. Ueno, K. Takai
{"title":"STXM-XANES analyses of carbonaceous matter in seafloor hydrothermal deposits from the ~3.5 Ga Dresser Formation in the North Pole area, Western Australia","authors":"M. Igisu, Y. Takahashi, K. Uematsu, Y. Takeichi, Y. Ueno, K. Takai","doi":"10.2343/geochemj.gj22010","DOIUrl":"https://doi.org/10.2343/geochemj.gj22010","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83333935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2343/geochemj.gj22020
Akihiro Tamura, T. Sagawa, K. Okino, T. Morishita
{"title":"Determination of whole-rock trace-element compositions of siliceous rocks using MgO-diluted fused glass and LA–ICP–MS","authors":"Akihiro Tamura, T. Sagawa, K. Okino, T. Morishita","doi":"10.2343/geochemj.gj22020","DOIUrl":"https://doi.org/10.2343/geochemj.gj22020","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76601871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2343/geochemj.gj22012
H. Masuda, Aoi Goto, A. Takeuchi
Concentrations ( n = 60) and stable isotope compositions ( n = 10) of mercury (Hg) were determined for sediments as deep as 2200 m below the seafloor at ODP (Ocean Drilling Program) and IODP (International Ocean Discovery Program) Site 0002C in the forearc Kumano Basin, Nankai Trough. Concentrations of Hg varied within the range of 30–240 μg/kg, except for three samples of trench-fill sediment from the accretionary prism in which Hg concentrations were 330–820 μg/kg. Range of the studied Hg concentration is similar to those of modern subareal and marine sediments. Stable isotope values were close to those of volcanogenic and hydrothermal materials: –0.26 to –0.83‰ for δ 202 Hg. No mass-independent fractionation was observed, as Δ 199 Hg was almost zero (range within 0.03 to 0.1). These results suggest that the Hg originated from volcanogenic or hydrothermal detrital materials and is being accreted and/or subducted with the oceanic plate.
{"title":"Concentration and stable isotope composition of Hg in deep-sea sediment from the Nankai Trough","authors":"H. Masuda, Aoi Goto, A. Takeuchi","doi":"10.2343/geochemj.gj22012","DOIUrl":"https://doi.org/10.2343/geochemj.gj22012","url":null,"abstract":"Concentrations ( n = 60) and stable isotope compositions ( n = 10) of mercury (Hg) were determined for sediments as deep as 2200 m below the seafloor at ODP (Ocean Drilling Program) and IODP (International Ocean Discovery Program) Site 0002C in the forearc Kumano Basin, Nankai Trough. Concentrations of Hg varied within the range of 30–240 μg/kg, except for three samples of trench-fill sediment from the accretionary prism in which Hg concentrations were 330–820 μg/kg. Range of the studied Hg concentration is similar to those of modern subareal and marine sediments. Stable isotope values were close to those of volcanogenic and hydrothermal materials: –0.26 to –0.83‰ for δ 202 Hg. No mass-independent fractionation was observed, as Δ 199 Hg was almost zero (range within 0.03 to 0.1). These results suggest that the Hg originated from volcanogenic or hydrothermal detrital materials and is being accreted and/or subducted with the oceanic plate.","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80928692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2343/geochemj.gj22015
R. Umam, M. Tanimizu, Hitomi Nakamura, Y. Nishio, Ryoudai Nakai, Naoto Sugimoto, Yasunori Mori, Yuuki Kobayashi, A. Ito, Sigeyuki Wakaki, K. Nagaishi, T. Ishikawa
14 Slab-dehydrated fluid is considered to be involved in island arc magmatism. In this study, Li 15 isotope ratios were determined for deep groundwater samples from the non-volcanic forearc 16 region of SW Japan. The contribution of the slab-dehydrated fluid from the Philippine Sea 17 Plate (PHS) was investigated in the Arima area and the eastern Kii Peninsula area, 18 corresponding to the slab depths of ~60 km and 20-30 km, respectively. In the Arima area, the 19 high-temperature thermal waters with high salinity called the Arima-type fluid were clarified 20 to have low δ 7 Li values of +1-+3‰. The low δ 7 Li values with high Li concentrations are 21 thought to be the result of fluid-rock interactions at high temperatures, which is consistent 22 with the characteristics of the slab-dehydrated fluid. On the other hand, the δ 7 Li values of 23 deep groundwaters in the eastern Kii Peninsula showed a wide range of +2 to +29‰. Several 24 groundwater samples had a similar chemical property to the Arima-type fluid: low δ 7 Li 25 values, low Cl/Li ratios, and 87 Sr/ 86 Sr ratios around 0.708-0.710. They are distributed along 26 the Median Tectonic Line (MTL) and within about 20 km south of the MTL. These results indicate a common supply of slab-dehydrated fluids to the non-volcanic forearc region in SW 28 Japan from PHS along the large faults, and Li isotope ratios will be a useful indicator to detect their contribution.
{"title":"Lithium isotope systematics of Arima hot spring waters and groundwaters in Kii Peninsula","authors":"R. Umam, M. Tanimizu, Hitomi Nakamura, Y. Nishio, Ryoudai Nakai, Naoto Sugimoto, Yasunori Mori, Yuuki Kobayashi, A. Ito, Sigeyuki Wakaki, K. Nagaishi, T. Ishikawa","doi":"10.2343/geochemj.gj22015","DOIUrl":"https://doi.org/10.2343/geochemj.gj22015","url":null,"abstract":"14 Slab-dehydrated fluid is considered to be involved in island arc magmatism. In this study, Li 15 isotope ratios were determined for deep groundwater samples from the non-volcanic forearc 16 region of SW Japan. The contribution of the slab-dehydrated fluid from the Philippine Sea 17 Plate (PHS) was investigated in the Arima area and the eastern Kii Peninsula area, 18 corresponding to the slab depths of ~60 km and 20-30 km, respectively. In the Arima area, the 19 high-temperature thermal waters with high salinity called the Arima-type fluid were clarified 20 to have low δ 7 Li values of +1-+3‰. The low δ 7 Li values with high Li concentrations are 21 thought to be the result of fluid-rock interactions at high temperatures, which is consistent 22 with the characteristics of the slab-dehydrated fluid. On the other hand, the δ 7 Li values of 23 deep groundwaters in the eastern Kii Peninsula showed a wide range of +2 to +29‰. Several 24 groundwater samples had a similar chemical property to the Arima-type fluid: low δ 7 Li 25 values, low Cl/Li ratios, and 87 Sr/ 86 Sr ratios around 0.708-0.710. They are distributed along 26 the Median Tectonic Line (MTL) and within about 20 km south of the MTL. These results indicate a common supply of slab-dehydrated fluids to the non-volcanic forearc region in SW 28 Japan from PHS along the large faults, and Li isotope ratios will be a useful indicator to detect their contribution.","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82990296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2343/geochemj.gj23002
Jaeguk Jo, Dongbok Shin
{"title":"Geochemical characteristics of REE-enriched weathered anorthosite complex in Hadong district, South Korea","authors":"Jaeguk Jo, Dongbok Shin","doi":"10.2343/geochemj.gj23002","DOIUrl":"https://doi.org/10.2343/geochemj.gj23002","url":null,"abstract":"","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74015957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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