Abstracts of Annual Meeting of the Geochemical Society of Japan

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54th Annual Meeting of the Geochemical Society of Japan

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Study on origin and decomposition processes of herbicide, Diuron, in river waters of Hiroshima prefecture

Hiroshi SAKUGAWA

Session ID: 1A01
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.1.0

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We studied origin and decomposition processes of herbicide, Diuron, occurring in river waters of Hiroshima prefecure.In Kurose River and Ashida River, the concentration of diuron was highest during warm seasons,supplied from paddy field and other fields,and decomposed by sunlight irradiation and microbial activity. The half-life and decomposition rate constants in river waters were determined.

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Underwater attenuation of ultraviolet radiation in Lake Biwa and the photobleaching of dissolved organic matter

Kazuhide Hayakawa, Chizuru Wada, Yoshikazu Sugiura, Tomoyo Suzuki, Yuk ...

Session ID: 1A02
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.2.0

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14C concentrations of DIC from Pumayum Co lake water and lakeside plants at the altitude of 5000m on the Tibetan Plateau

Toshio Nakamura, Takahiro Watanabe, Tomoko Ohta, Tomoyasu Fujii, Mitsu ...

Session ID: 1A03
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.3.0

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We collected lake water samples at several depths from the central part of Lake Pumayum Co locating at 5000m MSL on Tibetan Plateau, China, at about 60m deep in August 2006. About 100 ml of water sample was transferred plastic bottle, sealed tightly and brought back to Japan. At the AMS laboratory, dissolved inorganic carbon fraction was separated from each water sample, and analyzed for carbon isotopic ratios (14C/12C and 13C/12C) with a Tandetron AMS at Nagoya University. Terrestrial and water plants were also collected around the lake, and analyzed for carbon isotopic ratios. Depth profiles of DIC contents in the lake water, 14C concentrations and δ13C values of terrestrial and water plants as well as DIC will be discussed.

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Oxygen isotope fractionation of dissolved oxygen during reduction by ferrous iron

Yasuhiro OBA, Simon R. Poulson

Session ID: 1A04
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.4.0

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We report oxygen isotope fractionation of dissolved oxygen during reduction by Fe(II). Ferrous sulfate is dissolved in 60ml of water, and the reaction bottles were kept at 23, 40, and 54C. The headspace samples were extracted using gastight syringe and injected into EA/IRMS to measure concentration and isotope composition of oxygen molecule. The reduction rate of oxygen molecule increases with the increase of the reaction temperature and ferrous sulfate amounts. In contrast, oxygen isotope fractionation factor becomes smaller with the increase of reaction rate.

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Yasuko KIMURA, Yasutaka TERAKADO

Session ID: 1A05
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.5.0

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Takashi Nakamura, Saroj Chapagain, Futaba Kazama

Session ID: 1A06
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.6.0

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Chemical weathering studies of a large basaltic province, the Deccan Traps (India).

Das Anirban

Session ID: 1A07
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.7.0

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Chemical weathering of basalts draws important consideration for their study because of its enhanced role in controlling several geochemical processes such as silicate weathering and associated CO2 consumption. A systematic and detailed study on chemical weathering was made from the Deccan basalts (India) by analyzing elements and isotopes in river waters and sediments. The results show that the average contemporary silicate erosion rates and CO2 consumption rates of the Deccan are higher than their fractional aerial coverage. The entire studies on chemical weathering demonstrate the implication of basalt weathering, their enhanced role in weathering rates, atmospheric CO2 consumptions rates, and the role of Deccan basalt weathering to the secular Sr-isotope evolution at the KTB.

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A consideration of the appearance of Ce anomaly in stream waters and groundwaters

Mayumi Seto, Tasuku Akagi

Session ID: 1A08
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.8.0

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Tomofumi Obara, Takashi Tomiyasu, ryusuke Imura, katsuro Anazawa

Session ID: 1A09
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.9.0

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Shoichi Ichiki, Takashi Tomiyasu, Katsuro Anazawa

Session ID: 1A10
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.10.0

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Relation between corrosion level and composition of accumulating salt on weathering steel bridge

Masamichi Takebe, Makoto Ohya, Shota Ajiki, Takashi Furukawa, Yasuhiko ...

Session ID: 1A11
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.11.0

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Influence of deicing salt on corrosion of weathering steel bridge

Masamichi Takebe, Makoto Ohya, Ryo Adachi, Shota Ajiki, Jun-ya Ohta, R ...

Session ID: 1A12
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.12.0

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Kenji Furukawa, Yoshio Takahashi

Session ID: 1A13
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.13.0

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Influence of humic substances on the adsorption of organotin compounds to clay minerals

Tomonari Fujimoto, Yoshio Takahashi

Session ID: 1A14
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.14.0

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Teppei Harada, Satoshi Mitsunobu, Yoshio Takahashi

Session ID: 1A15
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.15.0

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Speciation of iodine in soil-water system by XANES and HPLC-ICP-MS

Yoko Shimamoto, Yoshio Takahashi

Session ID: 1A16
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.16.0

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Satoshi Mitsunobu, Yoshio Takahashi

Session ID: 1A17
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.17.0

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IKUKO NISHIDA, TOMOYUKI SAITO, YUUKI SHIMADA, YOSHIHIRO OKAUE, TAKUSHI ...

Session ID: 1A18
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.18.0

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tomoyuki saito

Session ID: 1A19
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.19.0

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Satoshi Wada, Yasutaka Terakado

Session ID: 1A20
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.20.0

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MAYURI INOUE, MASAHARU TANIMIZU

Session ID: 1A21
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.21.0

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Shinichi Tanaka, Yutaka Watanabe

Session ID: 1B01
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.22.0

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Enrichment of N2O in Bering sea and Chakchi sea

Akinari Hirota, Akira Ijiri, D. Daisuke Komatsu, B. Satoru Ohkubo, Fum ...

Session ID: 1B02
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.23.0

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Decomposition of sinking particulate nitrogen in the twilight zone in the western subarctic Pacific and its influence on the nitrogen isotopic ratio

Masahito Shigemitsu, Yutaka Watanabe, Yasuhiro Yamanaka, Makio Honda

Session ID: 1B03
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.24.0

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The objective of this research is to obtain the knowledge about decomposition of sinking particulate nitrogen in the twilight zone ( depths below the euphotic zone to 1000m) in the western subarctic Pacific and its influence on the nitrogen isotopic ratio. Samples were collected from March 20th, 2005 to September 18th, 2005 at 150m, 540m and 1000m water depth using time series sediment trap system. First, the simple settling model which could reconstruct the fluxes of settling particles at 540m and 1000m using the settling particle fluxes at 150m as initial values, was developed. In this model, following assumptions were made: 1) Total components sink simultaneously as same aggregates. 2) Organic materials, Calcium Carbonate and Opal in main components of sinking particles decompose in settling process. 3) Particle settling rates increase with depth. 4) Ballast minerals (Calcium Carbonate, Opal and Lithogenic materials) have constant organic matters that are protected from remineralization. We will report the results of analyzing the above objective based on this model.

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Yutaka Watanabe, Aki Mimura, Jun Nishioka

Session ID: 1B04
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.25.0

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Fumi Takeuchi, Yoshihiro Asahara, Kana Nagashima

Session ID: 1B05
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.26.0

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Hisanori Gotoh, Yoshihiro Asahara, Shinnosuke Shibata, Koshi Yamamoto

Session ID: 1B06
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.27.0

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Dissolved Al, In and Ce in the marginal seas of the western North Pacific

Hajime Obata, Dia Sotto Alibo

Session ID: 1B07
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.28.0

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Mutsuo INOUE, Yusuke NAKANO, Kiwamu TANAKA, Hisaki KOFUJI, Kazuhisa KO ...

Session ID: 1B08
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.29.0

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Vertical profiles of plutonium in the South Pacific mid-latitude region

Katsumi Hirose

Session ID: 1B09
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.30.0

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Masatoshi Yamada, Jian Zheng

Session ID: 1B10
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.31.0

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Profile of total chromium in the Pacific Ocean

Kenji Isshiki

Session ID: 1B11
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.32.0

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Yuhei Yamamoto, Yoshio Takahashi, Hiroshi Shimizu

Session ID: 1B12
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.33.0

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Kazuya Tanaka, Yoshio Takahashi, Hiroshi Shimizu

Session ID: 1B13
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.34.0

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Observation of ocean surface pCO2 of North Pacific and its decadal change

Yukihiro Nojiri, Hiromichi Tsumori

Session ID: 1B14
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.35.0

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National Institute for Environmental Studies (NIES) operated surface ocean CO₂ observation utilizing cargo ship servicing the North Pacific Ocean mid- and high latitude from 1995. Changing three cargo ship and totally 160 legs of measurement was successfully done until March 2006. Ocean surface pCO₂ increased with that of atmospheric CO₂, however, difference in the increasing rate was observed. Especially for 40 degree north in latitude, western North Pacific showed smaller ocean pCO₂ increasing rate, which suggests increasing ocean sink of CO₂. On the other hand, eastern North Pacific of 40 degree north showed larger increasing rate, which suggests decreasing ocean sink of CO₂.

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Methane dissociation flux from the seafloor massive methane hydrate found at off Joetsu region, eastern Japan Sea

Urumu Tsunogai, Shunsuke Saegusa, Fumiko Nakagawa, Tetsuo Yamazaki, Ji ...

Session ID: 1B15
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.36.0

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AYA HEIHO, HIROSHI SAKUGAWA

Session ID: 1B16
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.37.0

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Minor element distribution in Phacosoma japonicum shell for paleoclimate study

Kotaro Shirai, Tsuzumi Miyaji, Kazushige Tanabe, Naoto Takahata, Yuji ...

Session ID: 1B17
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.38.0

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Irradiation records of meteorites enriched in solar gases

Hiroshi Hidaka, Shigekazu Yoneda

Session ID: 1C01
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.39.0

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Noble gas studies show that some of regolith brecciated meteorites contain significant amount of solar gas component. This suggests near surface irradiation history of such meteorites on the parent bodies. Recent neutron capture study on Sm and Gd isotopes also show the early irradiation and regolith processes in aubrite parent body. In this study, Sm and Gd isotopic analyses of gas-rich or regolith brecciated meteorites were performed to find a possibility of the early irradiation on the meteorite parent bodies other than aubrite.

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Noble gas isotope analyses of grain size separated fractions from the Allende carbonaous chondrite.

Yoshinobu Nakamura, Yukio Yamamoto, Keisuke Nagao

Session ID: 1C02
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.40.0

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Solar noble gases in chondrules

Shintaro Matsuda, Hiroyuki Iio, Ken-ichi Bajo, Daisuke Nakashima, Keis ...

Session ID: 1C03
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.41.0

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Isotopic compositions of noble gases in inclusions of Udei Station(IAB iron)

Ken-ichi Bajo, Keisuke Nagao

Session ID: 1C04
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.42.0

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Change of primordial noble gas component "Q" in the Saratov chondrite (L4) by thermal metamorphism

hidetomo tsukamoto, chie miyakawa, sachiko amari, junichi matsuda

Session ID: 1C05
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.43.0

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Jun-ichi Matsuda, Yukihiro Matsuo, Masayuki Nara

Session ID: 1C06
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.44.0

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Primordial noble gases in chondrites: Characteristics of "Q" and "Ar-rich"

Yayoi Miura, Naoji Sugiura, kaoru Kiyota

Session ID: 1C07
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.45.0

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Heavily fractionated noble gases in an acid residue from the KLE98300 EH3 chondrite

Daisuke Nakashima, Ulrich Ott, Ahmed El Goresy, Tomoki Nakamura

Session ID: 1C08
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.46.0

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We found elementally fractionated Q noble gases in an acid residue from the KLE98300 EH3 chondrite, and we discuss the origin of the fractionated Q gases.

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Crystallization age of basaltic shergottites

Keiji Misawa, Takayuki Tomiyama, Hiroshi Kaiden, Akira Yamaguchi

Session ID: 1C09
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.47.0

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Pb isotopic compositions of CAIs in CV chondrite

Miwa Yoshitake, Katsuyuki Yamashita

Session ID: 1C10
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.48.0

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Kentaro Terada, Yuji Sano

Session ID: 1C11
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.49.0

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Ko Hashizume, Marc Chaussidon

Session ID: 1C12
Published: 2007
Released on J-STAGE: January 18, 2008

DOIhttps://doi.org/10.14862/geochemproc.54.0.50.0

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