J-STAGE期刊
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作者:Kazuya Tanaka , Yoshio Takahashi
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (5), pp.329-331J-STAGE
摘要:We examined three natural zircon samples with different amounts of radiation doses (1.9 × 1015–6.8 × 1015 α-decay events/mg) using MV-edge and LIII-edge U X-ray absorption near-edge structure (XANES). Analysis of XANES spectra at both MV-edge and LIII-edge suggested tha...
作者:Shinsuke Kawagucci , Jeffery S. Seewald
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (4), pp.281-291J-STAGE
摘要:We conducted a laboratory hydrothermal experiment that simulated generation of low molecular-weight hydrocarbons during seafloor sediment alteration at 275–361°C and 30 MPa. The abundance and carbon and hydrogen stable isotope composition of low molecular weight thermogenic ...
作者:Yongbin Wang , Bing Yu , Qingdong Zeng ...
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (4), pp.261-279J-STAGE
摘要:The petrogenesis and tectonic setting of Middle-Late Jurassic granitoids on Liaodong Peninsula, NE China, are debated. To resolve these uncertainties, this study analyzed geochemistry, zircon U-Pb ages and Hf-O isotopic compositions of the Wulong two-mica monzogranite on the...
作者:Mervi Söderlund , Heini Ervanne , Eveliina Muuri ...
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (4), pp.223-234J-STAGE
摘要:The sorption of alkaline earth cations Ca2+, Sr2+, Ba2+, and Ra2+ was investigated on Na-converted biotite, the main sorbing mineral in granitic bedrock at the nuclear waste disposal site in Olkiluoto, Finland. Batch sorption experiments were conducted under CO2-free conditi...
作者:Mariko Emoto , Kozo Takahashi , Tasuku Akagi
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (4), pp.249-259J-STAGE
摘要:To understand the contribution of carbonate, oxide, organic and siliceous matter to the vertical transportation of elements, sequential chemical leaching was applied to sediment-trap samples collected in and near the Bering Sea. A total of eleven samples representing periods...
作者:Yi Duan , Yingzhong Wu , Jingli Yao ...
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (3), pp.181-193J-STAGE
摘要:The normal alkanes (n-alkanes) and their hydrogen isotopic (δD) values in sediments and aquatic and terrestrial plants from Fuxian Lake area of China were analyzed by gas chromatography-mass spectrometry (GC-MS) and GC-isotope ratio mass spectrometry (GC-IRMS), respectively....
作者:Ryota Fukai , Tetsuya Yokoyama
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (5), pp.333-337J-STAGE
摘要:The advent of the latest-generation of mass spectrometers enables the determination of isotope ratios for several elements with very high precision. However, many obscure processes deteriorate analytical uncertainties. We investigated a likely process, the secondary instrumental ...
作者:Ryoichi Nakada , Naoko Asakura , Kazuya Nagaishi
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (5), pp.293-304J-STAGE
摘要:The cerium isotope ratio (δ142Ce), a novel proxy reflecting the paleoredox condition, yields more quantitative information related to the redox condition than Ce anomaly alone. However, sample amounts and analytical precision represent bottlenecks for Ce isotope measurements...
作者:Hiroshi A. Takahashi , Hiroko Handa , Ayumi Sugiyama ...
来源:[J].GEOCHEMICAL JOURNAL(IF 0.758), 2019, Vol.53 (5), pp.305-318J-STAGE
摘要:The concentration and carbon isotopic ratio (δ13C) of dissolved inorganic carbon (DIC) in natural waters is often altered by microbial activity, even over short durations, which can affect sample preservation. Hence, the influence of these biogenic processes should be limite...

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