{"title":"国際第四紀学連合第19回大会（International Union for Quaternary Research, XIX Congress, July 26 to August 2, 2015, Nagoya Congress Center, Nagoya, Japan）報告","authors":"毅彦 鈴木, 高 小口","doi":"10.4116/JAQUA.55.119","DOIUrl":"https://doi.org/10.4116/JAQUA.55.119","url":null,"abstract":"","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134511025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Chuenpee, T. Matsu'ura, O. Nishikawa, T. Uchida, I. Takashima
Using thermoluminescence (TL) technique (multiple aliquot regeneration method), we dated White Pumice tephra (WP), an unconsolidated tephra on Middle Pleistocene (MIS 7) marine terrace deposits at the Kamikita plain, Aomori Prefecture. We collected 6 and 10 samples from WP on outcrops at Kacchi and Shichihyaku, respectively for evaluation of chemical leaching. Concentration of radiometric elements (U, Th and K2O) was measured for all 16 samples. Among them, five samples were selected for TL age determination. The TL ages of three samples (187±29 ka, 230±23 ka and 229±38 ka, weighted mean : 216±15 ka) well coincide with a reported age of WP (MIS 7b ; 205-210 ka), correlated with δO stratigraphy of deep-sea sediments. The TL ages of other two samples (165±28 ka and 265±33 ka) are beyond the error range to 205-210 ka at mid MIS 7. The chemistry of former three samples falls in the concentrated zone of U-K2O and Th-K2O diagram. Other two samples were plotted far from concentrated zone of the same diagram. For TL age determination of unconsolidated tephra, annual dose evaluation through simple screening of chemical character is critical to obtain reasonable results.
{"title":"Thermoluminescence age determination for chemically selected samples of White Pumice tephra (WP) in the Kamikita plain, northeast Japan","authors":"T. Chuenpee, T. Matsu'ura, O. Nishikawa, T. Uchida, I. Takashima","doi":"10.4116/JAQUA.56.51","DOIUrl":"https://doi.org/10.4116/JAQUA.56.51","url":null,"abstract":"Using thermoluminescence (TL) technique (multiple aliquot regeneration method), we dated White Pumice tephra (WP), an unconsolidated tephra on Middle Pleistocene (MIS 7) marine terrace deposits at the Kamikita plain, Aomori Prefecture. We collected 6 and 10 samples from WP on outcrops at Kacchi and Shichihyaku, respectively for evaluation of chemical leaching. Concentration of radiometric elements (U, Th and K2O) was measured for all 16 samples. Among them, five samples were selected for TL age determination. The TL ages of three samples (187±29 ka, 230±23 ka and 229±38 ka, weighted mean : 216±15 ka) well coincide with a reported age of WP (MIS 7b ; 205-210 ka), correlated with δO stratigraphy of deep-sea sediments. The TL ages of other two samples (165±28 ka and 265±33 ka) are beyond the error range to 205-210 ka at mid MIS 7. The chemistry of former three samples falls in the concentrated zone of U-K2O and Th-K2O diagram. Other two samples were plotted far from concentrated zone of the same diagram. For TL age determination of unconsolidated tephra, annual dose evaluation through simple screening of chemical character is critical to obtain reasonable results.","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129880951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chisato Nakamura, M. Sakakibara, S. Sano, M. Ikeda, T. Tsuji, Nanami Yasuna
The Shoubu volcanic ash is intercalated with the middle Pleistocene Iyoki Formation, western Shikoku, Japan. The ash has been petrographically correlated with several widespread tephras, but detailed geochemical correlations have yet to be made. We therefore examine the lithology, petrography, glass geochemistry, and fission-track (FT) ages of the Shoubu ash in an attempt to establish robust, detailed correlations. The petrography and chemical composition of glass show vertical trends in the Shoubu ash. The FT age of the lowest unit indicates that eruptions began at 0.53±0.12 Ma. Although the Shoubu ash has previously been interpreted as a single, homogeneous volcanic ash, the results indicate that it either comprises several volcanic ashes or records a compositional change within a single eruptive sequence.
{"title":"Petrography and fission-track age of the middle Pleistocene Shoubu volcanic ash, western Shikoku, Japan","authors":"Chisato Nakamura, M. Sakakibara, S. Sano, M. Ikeda, T. Tsuji, Nanami Yasuna","doi":"10.4116/JAQUA.54.359","DOIUrl":"https://doi.org/10.4116/JAQUA.54.359","url":null,"abstract":"The Shoubu volcanic ash is intercalated with the middle Pleistocene Iyoki Formation, western Shikoku, Japan. The ash has been petrographically correlated with several widespread tephras, but detailed geochemical correlations have yet to be made. We therefore examine the lithology, petrography, glass geochemistry, and fission-track (FT) ages of the Shoubu ash in an attempt to establish robust, detailed correlations. The petrography and chemical composition of glass show vertical trends in the Shoubu ash. The FT age of the lowest unit indicates that eruptions began at 0.53±0.12 Ma. Although the Shoubu ash has previously been interpreted as a single, homogeneous volcanic ash, the results indicate that it either comprises several volcanic ashes or records a compositional change within a single eruptive sequence.","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"2022 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129457113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ecological niche modelling (ENM) is a computer-based method to extrapolate the niche probability of a species through machine learning using (1) known location of a species’ occurrence and (2) environmental factors such as temperature, precipitation and elevation. ENM is applicable to prehistoric archaeology based on the assumption that human behaviour and niche constructions were largely constrained by environmental factors. This paper applies ENM to a large-scale data of Upper Palaeolithic (UP) occupations in the Kanto-Koshinetsu region of eastern Japan in order to quantitatively assess and visualise ecological niche of UP populations to understand their behavioural strategies. Spatial niche probability was calculated with reconstructed palaeoclimatic data and landform indices for the Last Glacial Maximum (21 ka), taking into consideration four major lithic groups (trapezoids, kakusuijo-sekki, backed blades and microliths), which may reflect different strategies in resource procurement. Results indicated that niche probability was generally high in Musashino, Sagamino and Shimousa uplands in the southern Kanto region, although the observed site distribution was probably biased by intensive rescue excavations due to urban developments. The distance to the obsidian outcrops in the central highland remarkably contributed to the model. A closer look revealed two patches of high niche probability area in the Hakone mountains for the kakusuijo-sekki, backed blades and microliths. These patches were probably parts of a ‘niche corridor’ in association with the transportation of obsidian raw materials between the central highland and Hakone area via the Fujikawa valley.
{"title":"An ecological niche modelling of Upper Palaeolithic stone tool groups in the Kanto-Koshinetsu region, eastern Japan","authors":"Yasuhisa Kondo","doi":"10.4116/JAQUA.54.207","DOIUrl":"https://doi.org/10.4116/JAQUA.54.207","url":null,"abstract":"Ecological niche modelling (ENM) is a computer-based method to extrapolate the niche probability of a species through machine learning using (1) known location of a species’ occurrence and (2) environmental factors such as temperature, precipitation and elevation. ENM is applicable to prehistoric archaeology based on the assumption that human behaviour and niche constructions were largely constrained by environmental factors. This paper applies ENM to a large-scale data of Upper Palaeolithic (UP) occupations in the Kanto-Koshinetsu region of eastern Japan in order to quantitatively assess and visualise ecological niche of UP populations to understand their behavioural strategies. Spatial niche probability was calculated with reconstructed palaeoclimatic data and landform indices for the Last Glacial Maximum (21 ka), taking into consideration four major lithic groups (trapezoids, kakusuijo-sekki, backed blades and microliths), which may reflect different strategies in resource procurement. Results indicated that niche probability was generally high in Musashino, Sagamino and Shimousa uplands in the southern Kanto region, although the observed site distribution was probably biased by intensive rescue excavations due to urban developments. The distance to the obsidian outcrops in the central highland remarkably contributed to the model. A closer look revealed two patches of high niche probability area in the Hakone mountains for the kakusuijo-sekki, backed blades and microliths. These patches were probably parts of a ‘niche corridor’ in association with the transportation of obsidian raw materials between the central highland and Hakone area via the Fujikawa valley.","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126086327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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