Geochemical Journal最新文献_第7页

Isotopic analysis of nickel, copper, and zinc in various freshwater samples for source identification 不同淡水样品中镍、铜和锌的同位素分析，用于来源鉴定

IF 0.8 4区地球科学

Geochemical Journal Pub Date : 2021-01-01 DOI: 10.2343/GEOCHEMJ.2.0627

S. Takano, Mao Tsuchiya, S. Imai, Yuhei Yamamoto, Y. Fukami, Katsuhiko Suzuki, Y. Sohrin

{"title":"Isotopic analysis of nickel, copper, and zinc in various freshwater samples for source identification","authors":"S. Takano, Mao Tsuchiya, S. Imai, Yuhei Yamamoto, Y. Fukami, Katsuhiko Suzuki, Y. Sohrin","doi":"10.2343/GEOCHEMJ.2.0627","DOIUrl":"https://doi.org/10.2343/GEOCHEMJ.2.0627","url":null,"abstract":"Nickel (Ni), copper (Cu), and zinc (Zn) are commonly used in human activities and pollute aquatic environments including rivers and oceans. Recently, Ni, Cu, and Zn isotope ratios have been measured to identify their sources and cycles in environments. We precisely determined the Ni, Cu, and Zn isotope ratios in rain, snow, and rime collected from Uji City and Mt. Kajigamori in Japan, and investigated the potential of isotopic ratios as tracers of anthropogenic materials. The isotope and elemental ratios suggested that road dust is the main source of Cu in most rain, snow, and rime samples and that some of the Cu may originate from fossil fuel combustion. Zinc in the rain, snow, and rime samples may be partially attributed to Zn in road dust. Zinc isotope ratios in the Uji rain samples are lower than those in the road dust, which would be emitted via high temperature processes. Nickel isotope ratios are correlated with V/Ni ratios in the rain, snow, and rime samples, suggesting that their main source is heavy oil combustion. Furthermore, we analyzed water samples from the Uji and Tawara Rivers and the Kakita River spring in Japan. Nickel and Cu isotope ratios in the river water samples were significantly heavier than those in rain, snow, and rime samples, while Zn isotope ratios were similar. This is attributed to isotopic fractionation of Cu and Ni between particulate-dissolved phases in river water or soil.","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":"152 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79581125","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}

引用次数: 7

Europium isotope fractionation in highly fractionated igneous rocks with large Eu negative anomaly 具有大Eu负异常的高分选火成岩中铕同位素分选

IF 0.8 4区地球科学

Geochemical Journal Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0631

Seung-Gu Lee, Tsuyoshi Tanaka

{"title":"Europium isotope fractionation in highly fractionated igneous rocks with large Eu negative anomaly","authors":"Seung-Gu Lee, Tsuyoshi Tanaka","doi":"10.2343/geochemj.2.0631","DOIUrl":"https://doi.org/10.2343/geochemj.2.0631","url":null,"abstract":"highly fractionated granite is geologically related to postorogenic events and also to mineralization of rare-metals such as W, Sn, Sb, REEs etc. Another one of the geochemical characteristics of such highly fractionated granite is chondrite-normalized REE pattern with large Eu negative anomaly. In addition, the rhyolite is the most evolved volcanic rock. Since the chemical composition of major elements and chondrite-normalized REE patterns in rhyolite are similar to those of highly fractionated granites, rhyolite was considered highly fractionated igneous rock for comparison of Eu isotope ratio in highly fractionated granite. Eu is a very interesting element of REEs because it has two oxidation states (Eu2+ and Eu3+) whereas most of the rare earth elements exist as the trivalent state (3+) in the nature. The divalent oxidation state of Eu becomes a cause of elemental fractionation during magma evolution in the Earth and planetary system and can be used as an indicator of oxygen fugacity of magma system (Burnham et al., 2015). Eu has only two isotopes, 151Eu and 153Eu. Though Belli et al. (2007) reported that 151Eu decayed to 147Pm by α decay with the half-life T1/2 = 5 × 10 18 yr, apparently, 151Eu can be considered as a stable isotope in earth and solar system. In addition, Eu isotope ratio in geological rocks may vary due to redox condition in Earth system (Dauphas et al., 2014). Europium isotope fractionation in highly fractionated igneous rocks with large Eu negative anomaly","PeriodicalId":12682,"journal":{"name":"Geochemical Journal","volume":"64 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86205278","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}

引用次数: 3

10Be/9Be ratios of phenakite and beryl measured via direct Cs sputtering: Implications for selecting suitable Be carrier minerals for the measurement of low-level 10Be 通过直接Cs溅射测量的苯钠矿和绿柱石的10Be/9Be比率:选择合适的Be载体矿物用于测量低水平10Be的意义

IF 0.8 4区地球科学

Geochemical Journal Pub Date : 2021-01-01 DOI: 10.2343/geochemj.2.0630

Atsunori Nakamura, Atsuyuki Ohta, Hiroyuki Matsuzaki, Takashi Okai

引用次数: 1

Does carbon dioxide storage by cyanobacteria induce biomineralization in presence of basaltic glass? 蓝藻储存二氧化碳是否会在玄武岩玻璃中诱发生物矿化?

IF 0.8 4区地球科学

Geochemical Journal Pub Date : 2020-12-17 DOI: 10.2343/GEOCHEMJ.2.0617

Thomas Ferrini, Olivier Grandjouan, O. Pourret, R. Martinez

引用次数: 0

Constraints on redox conditions in the Japan Sea in the last 47,000 years based on Mo and W as palaeoceanographic proxies 基于Mo和W古海洋学代用物的近47000年来日本海氧化还原条件约束