Faculty Profiles - MINAMI, Masayo

Papers - MINAMI, Masayo

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エル・サルバドル共和国出土人骨のストロンチウム同位体比

南雅代

古代メソアメリカの考古資料を用いた学術的発展研究(名古屋大学総長裁量経費報告書) Vol. (予報) page： 23 - 30 2010

CHIME geochronology of granitic gneiss from Baekdong in the Hongseong area of the Gyeonggi Massif, South Korea. Reviewed

南雅代

Journal of Earth and Planetary Sciences, Nagoya University Vol. 57 page： 19 - 41 2010

鎌倉由比ケ浜南遺跡から出土した獣骨の14C年代-人骨の14C年代との比較-.

南雅代

第10回AMSシンポジウム報告書 page： 165 - 168 2009

封管法で微量のシュウ酸をガス化した場合のガス組成

南雅代

名古屋大学加速器質量分析計業績報告書 XX page： 152 - 155 2009

Comparison of δ13C and 14C activities of CO2 samples combusted in closed-tube and elemental-analyzer systems. Reviewed

南雅代

Nucl.Instr.and Meth.in Phys.Res. 2009

Strontium Isotope Analysis using Resonance Ionization Mass Spectrometry for Determination of Bone Origin

Seiji Sasada, Kenichi Watanabe, Yuki Higuchi, Hideki Tomita, Akiko Goto, Masayo Minami, Kazuhiro Suzuki, Takenori Kato, Takuya Hasegawa, Jun Kawarabayashi, Tetsuo Iguchi

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY Vol. 5 page： 97 - 100 2008.9

Language：Japanese Publisher：TAYLOR & FRANCIS LTD

We have considered the applicability of strontium isotope analysis, using Laser Ablation-assisted Resonance Ionization Mass Spectrometry (LA-RIMS), to the determination of bone origin. We separated the uncertainty into two categories: ion counting statistics, and short-term or uncontrollable shifts of experimental conditions; only the former decreases with increasing signal intensity. Additionally, we confirmed that long-term shifts of isotope ratio in LA-RIMS can be cancelled by an internal correction method. We preliminarily estimated the precision of our technique to be 0.7% (1 sigma) for 10(5) laser shots: the accuracy is also confirmed within the present uncertainty through the comparison with a reference value.

DOI： 10.1080/00223131.2008.10875986

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鎌倉由比ケ浜南遺跡から出土した獣骨の^<14>C年代-人骨の^<14>C年代との比較-

南雅代

第10回AMSシンポジウム報告書 page： 165 - 168 2008

試料燃焼-二酸化炭素精製における炭素同位体比分別-封管法と元素分析計による試料調製の違い-.

南雅代

名古屋大学加速器質量分析計業績報告書 XIX page： 117 - 126 2008

古人骨の同一個体内における部位の違いによるδ13C・δ15N値、14C年代の相違の有無.

南雅代

名古屋大学加速器質量分析計業績報告書 XIX page： 117 - 126 2008

Geochemical mapping in Aichi prefecture, Japan: Its significance as a useful dataset for geological mapping

Koshi Yamamoto, Tsuyoshi Tanaka, Masayo Minami, Koichi Mimura, Yoshihiro Asahara, Hidekazu Yoshida, Setsuo Yogo, Makoto Takeuchi, Masami Inayoshi

APPLIED GEOCHEMISTRY Vol. 22 ( 2 ) page： 306 - 319 2007.2

Language：Japanese Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Since 1994 a geochemical mapping project has been undertaken in Aichi prefecture, central Japan, with the aim of establishing a database to contribute to environmental assessment in the region. To date more than 1200 stream sediments have been collected and analyzed. The samples were analyzed for 10 major elements by X-ray fluorescence spectrometry and loss-on-ignition.
The analyses show that stream sediments from areas with sedimentary bedrock are enriched in SiO2 and mafic elements such as TiO2 and Fe2O3 compared to areas with granitic bedrock. The SiO2 enrichment is mainly due to the amount of quartz and the enrichment in mafic elements is due to biotite, both of which are derived from the sedimentary bedrock. In contrast, sediments derived from granitic bedrock are characterized by high abundances of elements contained in feldspars such as Na2O and CaO. This contrast in elemental distribution (e.g., Na2O/TiO2 ratio) can be useful for geological mapping in the areas covered by vegetation and with poor bedrock exposure. The relative abundances of Ca, Na and K in the stream sediments suggest that the Inagawa granite, one of the main granite bodies in the study area, can be classified into four distinct types. This classification is distinct from previous classifications based on geological and petrochemical studies. It is confirmed that analysis of geochemical compositions of stream sediments has considerable potential as a tool in geological studies including lithological mapping. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.apgeochem.2006.09.011

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Diverse microstructures from Archaean chert from the Mount Goldsworthy - Mount Grant area, Pilbara Craton, Western Australia: microfossils, dubiofossils, or pseudofossils? Reviewed

Sugitani, K., Grey, K., Allwood, A.C., Nagaoka, T., Minami, M., Marshall, C.P., Van Kranendonk, M.J. and Walter, M.R.

Precambrian Research Vol. 158 page： 228-262 2007

Application of 14C wiggle-matching to support dendrochronological analysis in Japan

Nakamura T, Okuno M, Kimura K, Mitsutani T, Moriwaki H, Ishizuka Y, Kim K.H, Jing B.L, Oda H, Minami M, Takada H

Tree-Ring Research Vol. 63 ( 1 ) page： 37 - 46 2007

Language：Japanese Publisher：Tree-Ring Research

14C wiggle-matching was applied to two wood samples closely related to geological and archaeological events with associated dendrochronological dates, to demonstrate the accuracy of 14C dating with accelerator mass spectrometry (AMS). Wiggle-matching on charred wood with bark, excavated from a pyroclastic mud-flow deposited by the huge 10th Century eruption of the Baitoushan Volcano, revealed the eruption age as cal A.D. 935 +8/-5 with 95% confidence. This date is consistent with the eruption age of A.D. 912 to A.D. 972 estimated by dendrochronology on two wooden boards that had clear stratigraphical connections to the B-Tm tephra deposit in Japan, an ash fall layer formed by the eruption of the Baitoushan Volcano. The date is also consistent with an A.D. 937-938 date estimated by the analysis of varved sediments from Lake Ogawarako in Aomori prefecture. The other wooden board collected from the Mawaki archaeological site in Ishikawa prefecture was wiggle-matched as 783 +13/-11 cal B.C. with 95% confidence, which is consistent with the dates of 830 cal B.C. to 759 cal B.C. obtained for seven wooden poles from the same wooden structures as the wooden board. These results are highly encouraging for obtaining accurate dates on wood when dendrochronology cannot be used. Copyright © 2007 by the Tree-Ring Society.

DOI： 10.3959/1536-1098-63.1.37

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鎌倉由比ケ浜埋葬人骨および獣骨の地球化学的研究

南雅代

名古屋大学加速器質量分析計業績報告書 XVIII page： 134 - 143 2007

Marine reservoir effect deduced from 14C dates on marine shells and terrestrial remains at archeological sites in Japan. Reviewed

南雅代

Nucl. Instr. and Meth. in Phys. Res. B259 page： 453 - 459 2007

Estimation of paleotemperature from racemization of aspartic acid in combination with radiocarbon age. Reviewed

南雅代

Nucl. Instr. and Meth. in Phys. Res. B259 page： 547 - 551 2007

An improved extraction system to measure carbon-14 terrestrial ages of meteorites and pairing of the Antarctic Yamato-75097 group chondrites

Minami M, Terui A, Takaoka N, Nakamura T

METEORITICS & PLANETARY SCIENCE Vol. 41 ( 4 ) page： 529 - 540 2006.4

Application of Sr isotopes to geochemical mapping and provenance analysis: The case of Aichi Prefecture, central Japan

Y Asahara, H Ishiguro, T Tanaka, K Yamamoto, K Mimura, M Minami, H Yoshida

APPLIED GEOCHEMISTRY Vol. 21 ( 3 ) page： 419 - 436 2006.3

Language：Japanese Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Geochemical maps expressing areal distributions of chemical elements in the earth's land surface have been published in several countries in relation to various global environment issues. The authors have applied a radiogenic isotope ratio, Sr-87/Sr-86, to geochemical mapping in order to understand the geological origin, transportation and dispersion system of chemical elements in the earth's land surface. The Sr isotope ratio is a useful tracer for distinguishing the geological origin of surficial deposits, especially in areas where surface exposure of bedrocks is low, because it is not significantly altered by the processes of weathering and transportation. Most bedrocks in the Japanese islands are covered by plants, soils and urban areas. In this study, 142 of 1219 stream sediments (< 180 mu m) collected from the northeastern part of Aichi Prefecture, in the central part of Japan (75 km x 30 km), were analyzed. Their Sr isotope ratios range from 0.7086 to 0.7315 with an average of 0.7129, except for one sample. This average is higher than the mean of the upper crust of the Japan Arc (the Japanese Island Crustal Composite, JICC), 0.7077. This difference can be attributed to the below-average presence of young volcanic rocks, generally having lower Sr-87/Sr-86 values, and the above-average presence of granitic rocks, in the study area compared with the surface exposure of the Japan Arc. The first factor controlling the distribution of Sr isotope ratios is the bedrock distributed around the sampling points. Regional variation in the Sr-87/Sr-86 value shows that it is higher in the western and southeastern parts, where sedimentary rocks and metamorphic rocks are distributed, and that it is lower mainly in the central part, where granitic rocks are distributed. The Rb-87/Sr-86-Sr-87/Sr-86 plot for stream sediments more clearly reveals the differences and similarities of bedrocks. In some locations, the distribution of Sr isotope ratios does not correspond to that of bedrocks on the geological map. One reason is the existence of unmapped bedrock, for example, small intrusive masses of granite. The other is fluvial transportation and dispersion. The distribution of the isotope ratios suggests that some stream sediments include surficial deposits from a few km upstream. Application of the Sr isotope ratio to geochemical mapping is useful for revealing both the distribution of unexposed bedrocks and the transportation of surficial deposits. Information on unexposed bedrocks will be expected to contribute to the improvement of geological mapping. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.apgeochem.2005.12.003

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Carbon and nitrogen isotopic fractionation in bone collagen during chemical treatment

M Minami, T Nakamura

CHEMICAL GEOLOGY Vol. 222 ( 1-2 ) page： 65 - 74 2005.10

Language：Japanese Publisher：ELSEVIER SCIENCE BV

In measuring radiocarbon ages of fossil bone samples, it is necessary to extract pure bone protein from the samples by chemical treatment. To evaluate the effect of the chemical treatment including XAD-2 chromatography on carbon and nitrogen isotopic values, we measured C/N ratio, delta(13)C and delta(15)N in decalcified fraction, gelatin, hydrolysate, and XAD-treated hydrolysate extracted from fossil bones together with modem samples. The C/N ratios of the collagen fractions progressively decreased as chemical treatment proceeded. The delta(13)C values of the fractions became more positive as purification proceeded. There was an overall +0.5 similar to+2.0 parts per thousand difference in delta(13)C and a slight trend of decrease in delta(15)N during chemical processing and around +0.3 parts per thousand difference in delta(13)C and +0.2 parts per thousand in delta(15)N during XAD-2 treatment only. The large change in C/N ratio and delta(13)C of the hydrolysates following XAD-2 chromatography in the Bovine Achilles tendon collagen standard could be explained by the removal of lipids unextracted before the XAD-2 treatment. There was no difference in 613 C between hydrolysates and XAD-treated hydrolysates in fossil bones because the latter contains negligible preserved lipids. Fossil bones and lipid-extracted collagen standard showed the similar C/N change and isotopic fractionation during sequential chemical treatment. Individual amino acid standards showed little to no increase in delta(13)C and delta(15)N values during XAD-2 treatment, except for aspartic acid and glutamic acid, which showed pronounced increase in delta(15)N values. Furthermore, regarding amino acid compositions separated by XAD-2 treatment, alanine and glycine tend to be enriched, while valine, threonine, isoleucine, leucine, and serine compositions tend to be depleted. The carbon and nitrogen isotopic fractionation during sequential chemical treatment might reflect variation in the amino acid composition of the extracted fractions due to degradation, such as decarboxylation, rather than removal of contaminants. The variation during XAD-2 treatment is due to both degradation by HCl and isotopic fractionation related to the XAD-2 resin. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.chemgeo.2005.06.005

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Database for geochemical mapping of the northeastern areas of Aichi Prefecture, central Japan -XRF major element data of stream sediments collected in 1994 to 2004-

南雅代, 山本鋼志, 三村耕一

Jour. Earth Planet. Sci. Nagoya Univ. 52 page： 25 - 67 2005

Chemical techniques to extract organic fractions from fossil bones for accurate C-14 dating

M Minami, H Muto, T Nakamura

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 223 ( SPEC. ISS. ) page： 302 - 307 2004.8

Language：Japanese Publisher：ELSEVIER SCIENCE BV

We examined different concentrations of HCI, such as 0.4, 0.6, 0.8, 1.0 and 1.2 M, for decalcification of fossil bones and different times of 0.1 M NaOH treatment on collagens to determine the best conditions for purifying collagen through extraction of humic contaminants, and compared the alkali treatment method with the XAD-2 treatment method for several types of fossils. The yield of acid-insoluble bone fractions did not change over the range from 0.4 to 1.0 M HCI and decreased suddenly with 1.2 M HCl on decalcification, and the 14 C ages of the extracted gelatins from the five decalcified fractions were unchanged, suggesting that <1.0 M, and probably about 0.4 M, is recommended to the best concentration of HCI to decalcify fossil bones efficiently. The alkali treatment was done with 0.1 M NaOH at room temperature. The NaOH-treated collagens, with a considerable loss of organic bone protein especially for long treatment time, gave almost the same C-14 ages as those of the XAD-purified hydrolysates. The NaOH-treatment time should be less than several hours to avoid a loss of collagen. The fossil bones used are relatively well-preserved, but the alkali treatment could bring about a lot of loss of organic bone proteins for poorly-preserved bones. The XAD-2 treatment method is effective for accurate radiocarbon dating of fossil bones, if the XAD-2 resin is completely precleaned. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2004.04.060

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Papers - MINAMI, Masayo