Faculty Profiles - MINAMI, Masayo

Papers - MINAMI, Masayo

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炭化物の14C-前処理過程の化学的解明−和歌山県根来寺坊院跡から出土した炭化米の分析− Reviewed

冨山慎二・南雅代・中村俊夫・金原正明

考古学と自然科学 Vol. 72 page： 45 - 61 2016

Influence of Akiyoshi limestone bedrock on elemental concentrations and Sr isotopic ratio in stream sediments Reviewed

Jomori Yuka, Ohta Atsuyuki, Minami Masayo

Chikyukagaku Vol. 50 ( 1 ) page： 11 - 27 2016

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Geochemical Society of Japan

Chemical compositions and Sr isotopic ratio (87Sr/86Sr) of stream sediments collected from Akiyoshi-dai, where is underlain by a large-scale limestone bedrock, were measured to investigate the influence of limestone bedrocks on geochemical maps. The sediments were sieved with eight screen sizes, and their bulk and acetic acid soluble fractions were both analyzed. 50–100% of the total Ca was extracted by acid leaching from stream sediments in the catchment of Akiyoshi limestone, indicating that Ca exists mainly in carbonate materials. In contrast, only 5–10% and 15–45% of the total Sr were extracted from their coarse (>125 μm) and fine particles (<125 μm),respectively. Therefore, Sr exists dominantly in aluminosilicate minerals even in stream sediments originated from limestone bedrock. Because the acid extraction percentages of Ca and Sr increase exponentially below 125 μm of grain size, carbonate materials would be supplied by fine-grained particles from limestone bedrock. 87Sr/86Sr ratios in the acid soluble fractions were systematically lower than those of the bulk fractions and comparable to 87Sr/86Sr of Akiyoshi limestone. Although limestone bedrock apparently scarcely influence on Sr concentration and 87Sr/86Sr of stream sediments, 87Sr/86Sr of carbonate materials is successfully extracted from the bulk sediments using acetic acid-based extraction method.

DOI： 10.14934/chikyukagaku.50.11

CiNii Research

炭化物の信頼性ある14C年代測定．

南雅代

新学術領域研究ニュースレター Vol. 8 page： 7 - 10 2016

八日市地方遺跡出土遺物の炭素年代測定と安定同位体分析

宮田佳樹, 南雅代, 中村俊夫

八日市地方遺跡報告書Ⅲ Vol. Ⅲ 2016

奈良県三郷町持聖院所蔵蔵骨器内骨片の化学分析結果

椋本ひかり, 南雅代

奈良県三郷町持聖院所蔵伝解脱上人貞慶五輪塔及び五輪塔地下出土蔵骨器調査報告書 Vol. - page： 10 - 15 2016

Radiocarbon Dating of Charcoal Remains (Operation E) International coauthorship

南雅代

al-Rafidan Vol. XXXVII page： 136 - 140 2016

Seasonal variations of C-14 and delta C-13 for cave drip waters in Ryugashi Cave, Shizuoka Prefecture, central Japan Reviewed

Masayo Minami, Tomomi Kato, Keiji Horikawa, Toshio Nakamura

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 362 page： 202 - 209 2015.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Speleothem C-14 has recently emerged as a potentially powerful proxy for hydrology changes in comparison with atmospheric C-14 calibration curve, rather than as a direct dating tool, apart from a time marker using bomb peak of C-14. Some possible causes for the relationship between speleothem C-14 content (or dead carbon fraction: DCF) and karst hydrology have been proposed, such as changes in temperature, precipitation, drip water flow dynamics, cave air ventilation, soil air pCO(2). In this study, we investigated seasonal variation in C-14 and delta C-13 of drip water in Ryugashi Cave, Shizuoka Prefecture, central Japan, to examine the causes of the C-14 and delta C-13 variations in a speleothem. The results show that different C-14 concentrations and delta C-13 values of drip water from the Ryugashi Cave, were exhibited at different sites of the Caves No. 1, No. 3, and No. 4, which have different temperature, air pCO(2), and flow paths. Further, the C-14 and delta C-13 of drip waters showed seasonal variations at all sites, which were lower in fall and winter, and higher in spring and summer, though the extent of the variations was different among the sites. The C-14 in drip waters tended to be correlated with the drip rates: C-14 tended to be higher in drip waters with higher drip rates, and also correlated with rainfall amount around the Ryugashi Cave, especially for the drip waters in Cave No. 3, which are considered to have simpler flow paths. The increase in rainfall amount could bring the increase in drip rate of drip water, and then the decrease in interaction between solution and karst, resulting in C-14 increase (DCF decrease) in drip water. Accordingly, the reconstruction of precipitation could be performed using C-14 variation in a speleothem formed by drip water with simple flow dynamics. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2015.05.020

Web of Science

Scopus

Early post-mortem formation of carbonate concretions around tusk-shells over week-month timescales Reviewed International coauthorship

Hidekazu Yoshida, Atsushi Ujihara, Masayo Minami, Yoshihiro Asahara, Nagayoshi Katsuta, Koshi Yamamoto, Sin-iti Sirono, Ippei Maruyama, Shoji Nishimoto, Richard Metcalfe

SCIENTIFIC REPORTS Vol. 5 page： 1-7 2015.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP

Carbonate concretions occur in sedimentary rocks of widely varying geological ages throughout the world. Many of these concretions are isolated spheres, centered on fossils. The formation of such concretions has been variously explained by diffusion of inorganic carbon and organic matter in buried marine sediments. However, details of the syn-depositional chemical processes by which the isolated spherical shape developed and the associated carbon sources are little known. Here we present evidence that spherical carbonate concretions (diameters. : 14 similar to 37 mm) around tusk-shells (Fissidentalium spp.) were formed within weeks or months following death of the organism by the seepage of fatty acid from decaying soft body tissues. Characteristic concentrations of carbonate around the mouth of a tusk-shell reveal very rapid formation during the decay of organic matter from the tusk-shell. Available observations and geochemical evidence have enabled us to construct a 'Diffusion-growth rate cross-plot' that can be used to estimate the growth rate of all kinds of isolated spherical carbonate concretions identified in marine formations. Results shown here suggest that isolated spherical concretions that are not associated with fossils might also be formed from carbon sourced in the decaying soft body tissues of non-skeletal organisms with otherwise low preservation potential.

DOI： 10.1038/srep14123

Web of Science

Scopus

PubMed

Radiocarbon Dating of Charcoal Remains Excavated from Qalat Said Ahmadan.

Minami, M. and Tomiyama, S.

Vol. XXXVI page： 53-57 2015

メソアメリカ南東部太平洋沿岸における先スペイン期製塩活動−エルサルバドル共和国ヌエバ・エスペランサ遺跡を中心に−. Reviewed

市川彰・南雅代・八木宏明

日本考古学論文 Vol. 40 page： 1-18 2015

近年の14C AMS進歩の概要

南雅代

名古屋大学加速器質量分析計業績報告書 Vol. 26 page： 55 - 60 2015

貞慶の火葬遺骨を用いた14C年代測定の試み

南雅代, 中村俊夫

第17回AMSシンポジウム報告集 Vol. 17 page： 134 - 136 2015

水試料の化学処理法による14C比較プログラム (RICE-W) -経過報告-

高橋浩, 南雅代, 荒巻能史, 中村俊夫

第17回AMSシンポジウム報告集 Vol. 1 page： 56 - 59 2015

水試料の14C・δ13C分析のための前処理法の比較検討

南雅代, 高橋浩, 荒巻能史, 中村俊夫

第16回AMSシンポジウム報告集 Vol. - page： 56 - 60 2014

名古屋大学タンデトロンAMSシステムの現状（2013年度）

中村俊夫, 南雅代

第16回AMS シンポジウム報告書 Vol. 16 page： 27 - 32 2014

Ultrafiltration pretreatment for 14C dating of fossil bones from archaeological sites in Japan Reviewed

Minami M., Sakata K., Takigami M., Nagaoka T., Nakamura T.

Radiocarbon Vol. 55 ( 2-3 ) page： 481 - 490 2013.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Radiocarbon

To study the effect of ultrafiltration on the radiocarbon ages of relatively poorly preserved bones in Japan, we analyzed the 14C dates of high-molecular-weight (HMW) gelatin samples and compared them with those of other extracted organic fractions, unfiltered gelatin samples extracted from NaOH-treated or NaOH-untreated collagen, and XAD-purified hydrolysates of animal fossil bones (~4600 BP; gelatin yield of 2-4%) from the Awazu underwater archaeological site, Shiga, Japan. NaOH-treated, unfiltered gelatins and XAD-purified hydrolysates showed statistically similar 14C ages to those of HMW gelatins. The 14C ages of the HMW gelatins were the oldest and similar to those of wood collected from the same layer as the bones, and the NaOH-treated, unfiltered gelatins gave 14C ages within the acceptable margins of error; therefore, ultrafiltration was effective for accurate 14C dating, while NaOH-treated gelatin without ultrafiltration was also sufficient to obtain accurate 14C dates on the animal bones. The 14C ages of human skeletons (~750 BP; gelatin yield of 2-11%) from 5 individuals excavated from an archaeological site in Yuigahama, Kamakura, Japan, showed statistically the same 14C ages as NaOHtreated, unfiltered gelatins and HMW gelatins within the margins of error, although HMW gelatins were likely to give slightly older ages than unfiltered gelatin with a yield of less than ~3%. These results indicate that unfiltered gelatins extracted from fossil bones of gelatin yield more than ~3% can produce accurate 14C ages without the need for ultrafiltration. Ten bone fragments from 3 humans showed the same 14C ages for each individual, suggesting that any bone part from an individual can be used to obtain a representative age. The 14C ages of tooth enamels of 2 individuals were 35 and 70 yr older than their bone ages. Death dates obtained from these age gaps agreed with those determined by morphology. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.

DOI： 10.2458/azu_js_rc.55.16334

Scopus

Spatial distribution of 87Sr/86Sr ratios of stream sediments in Shikoku Island and the Kii Peninsula, Southwest Japan Reviewed

JOMORI YUKA, MINAMI MASAYO, OHTA ATSUYUKI, TAKEUCHI MAKOTO, IMAI NOBORU

GEOCHEMICAL JOURNAL Vol. 47 ( 3 ) page： 321 - 335 2013.6

Language：English Publishing type：Research paper (scientific journal) Publisher：GEOCHEMICAL SOCIETY OF JAPAN

Geochemical mapping of 87Sr/86Sr ratios in Shikoku Island and the Kii Peninsula of Southwest Japan was performed using 233 samples of stream sediments (<180 μm). The spatial distribution of 87Sr/86Sr ratios successively increases from northern to southern geological units, with a gap at the Median Tectonic Line (MTL). In the Inner Zone divided by the MTL, a zone with Cretaceous granitoid rocks of the Ryoke Belt and sedimentary rocks of the Izumi Group, the 87Sr/86Sr ratios are measured at ~0.710. In the Outer Zone, a zone with Cretaceous metamorphic rocks of the Sanbagawa Belt and Jurassic to Miocene accretionary complexes of the Chichibu Belt and Shimanto Belts, the 87Sr/86Sr ratios tend to fall in the range from 0.706 to 0.715, tend to increase from north to south, and are highest in the youngest accretionary complex of the Southern Shimanto Belt. The 87Rb/86Sr-87Sr/86Sr plots for stream sediments more clearly reveal the differences and similarities of their bedrocks, such as the different trends among the stream sediments of the Inner and Outer Zones. Samples collected from the Inner Zone show almost the same 87Rb/86Sr-87Sr/86Sr field as their source rocks, while most of the samples derived from accretionary complexes in the Outer Zone are plotted around a mixing line of older continental detritus and igneous-rock-derived materials. In light of the other geochemical characteristics observed, particularly the REE chemical features of the stream sediments and zircon ages in the basemental sedimentary rocks, the accretionary complexes in the Outer Zone may be mainly formed from the same source rocks, namely, igneous-rock-derived materials and continental detrital materials with different mixing ratios and a larger ratio of continental materials in the Southern Shimanto Belt. This study indicates that 87Sr/86Sr ratios of stream sediments strongly reflect the isotopic composition of the source rocks and are very useful for distinguishing the various geological and geochemical settings of the source rocks.

DOI： 10.2343/geochemj.2.0248

Scopus

CiNii Research

Long-term stability of fracture systems and their behaviour as flow paths in uplifting granitic rocks from the Japanese orogenic field

H. Yoshida, R. Metcalfe, M. Ishibashi, M. Minami

GEOFLUIDS Vol. 13 ( 1 ) page： 45-55 - 55 2013.2

Language：Japanese Publisher：WILEY-BLACKWELL

In granitic rocks, fracture networks typically provide pathways for groundwater flow and solute transport that need to be understood to assess the long-term performance of deep underground storage or disposal facilities such as radioactive waste repositories. However, relatively little is known about the long-term processes of fracturing and/or the longevity of flow paths (FP) in granitic rocks distributed within orogenic belts. To clarify these issues, Japanese plutons of different ages and in situ fractures in granite at the Mizunami Underground Research Laboratory (MIU) located in central Japan were studied. Detailed structural characterization and geochemical analysis of in situ fracture fillings sampled from a depth of 300m were carried out to clarify the relationship between fracturing and mineral infilling processes. Different plutons show identical episodes of fracturing and fracture filling, consisting of: brittle tensile fracturing, due to decreasing temperature through the ductilebrittle transition after plutonic intrusion (Stage I); relatively rapid uplifting (ca. a few mm/year) accompanied by hydrothermal water circulation, which produced uncrushed layered mineral fillings (Stage II); and a period of low-temperature meteoric water circulation following exposure after uplift (Stage III). The parageneses of carbonate mineral fracture fillings and their carbon isotopic compositions (14C, 13C) show that there were distinct episodes of carbonate mineral precipitation during the rapid uplifting of a pluton. The carbonate minerals that formed during each episode incorporated carbon from a distinct source. The evolution of fillings identified here enables development of a specific model of fracturing and persistence of fluid-conducting systems in the plutons of the orogenic field.

DOI： 10.1111/gfl.12008

Web of Science

Scopus

Small-mass AMS radiocarbon analysis at Nagoya University Reviewed

Masayo Minami, Tomomi Kato, Yoshiki Miyata, Toshio Nakamura, Quan Hua

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 294 page： 91 - 96 2013.1

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

As part of the ongoing development at the AMS facility of the Center for Chronological Research at Nagoya University to radiocarbon (C-14) analyze samples smaller than 0.5 mg carbon (mgC), a compact graphitization manifold has been built. Tests with various reference materials show it performs well for samples as small as 0.1 mgC. Preparation with this new system is compared with the performance of the older protocol for regular-sized samples. Furthermore, it is shown that the addition of Cu and Ag before and stepwise heating during sealed-tube combustion of samples with high S content improve the degree of conversion to CO2 without having to resort to special purification measures such as the use of Co3O4 + Ag reagent and an n-pentane/LN2 trap before graphitization. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2012.02.036

Web of Science

Scopus

Constraint on radiocarbon age correction in Lake Biwa environment from the middle to late Holocene Reviewed

Y. Miyata, M. Minami, S. Onbe, M. Sakamoto, T. Nakamura, M. Imarnura

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 294 page： 452 - 458 2013.1

Language：Japanese Publisher：ELSEVIER SCIENCE BV

Using data from previous studies and newly collected data, we compared the measured radiocarbon ages of molluscan shells, common reed (Phragmites australis) and pine needles (Pinus thunbergii) collected in 1966, 1970, 1990 and 2008 at Lake Biwa in Japan, and of archaeological samples, to examine radiocarbon reservoir effects at Lake Biwa. We also tested for differences in the radiocarbon reservoir effect between species and locations in the lake. The effects of nuclear bomb tests conducted in the 1950s and 1960s are clear, the offset between atmospheric C-14 and the Lake Biwa freshwater C-14 is larger for this period because the atmospheric C-14 is so high. The semiclosed Lake Biwa system is in dynamic equilibrium with the atmosphere, resulting in the C-14 content of the water following the changes in atmospheric C-14 caused by nuclear testing. The shells collected after 1990 had radiocarbon ages that were 330-450 C-14 years older than those of the coeval atmosphere. The apparent differences in radiocarbon age (about 300 C-14 years) between shell fossils and wood samples excavated from the same layer of the submerged Awazu shell midden at Lake Biwa suggest that the radiocarbon reservoir effect also existed in the middle Holocene (the Middle Jomon period, about 5000 years ago). Because the present-day average residence time of Lake Biwa water is 3-6 years, its direct influence on the radiocarbon reservoir effect is small, which suggests that old carbon has been supplied into Lake Biwa. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2012.09.027

Web of Science

Scopus

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Papers - MINAMI, Masayo