研究者詳細 - 北川　浩之

論文 - 北川　浩之

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Dolphins from a prehistoric midden imply long-term philopatry of delphinids around Tokyo Bay 招待有り査読有り

Biological Journal of the Linnean Society 2023年11月

Delta initiation under low sediment discharge: Insights from Holocene incised valley fills north of Tokyo Bay, central Japan 招待有り査読有り国際共著

Susumu Tanabe, Wan Hong, Junghun Park, Hiroyuki Kitagawa

Marine Geology 463 巻 2023年9月

北海道オホーツク海沿岸のΔRの検討

小元久仁夫, 北川浩之, 平河内毅

季刊地理学 75 巻 ( 2 ) 頁： 78 - 85 2023年

記述言語：日本語出版者・発行元：東北地理学会

海洋生物化石の14C年代をより一層正確な暦年代に較正するためには，14C年代較正プログラムにΔR（試料採取地点の14C年代の補正値）を入力しなければならない。Omoto et al.（2010）が報告した北海道オホーツク海沿岸のΔR（－158 yr）は，太平洋沿岸や日本海沿岸のΔR（34 yr～345 yr）と乖離している。この結果を踏まえて北海道オホーツク海沿岸のΔRを新たに決定するため，斜里町のオシャマップ川遺跡とトーツル沼1遺跡から木炭と貝化石をペアとする合計4組の試料を収集してAMSによる14C年代測定を行い，Marine20にもとづきΔRを計算した。その結果，オシャマップ川遺跡III層のΔR（1σ）は－94±60 yrとなり，またトーツル沼1遺跡のPit 2から55±46 yrと135±45 yr（平均95±64 yr）のΔRが得られた。新たに決定されたΔRは，かつてトコロ貝塚の試料にもとづき決定された－158 yr（Marine20にもとづき計算すれば－323±42 yr）とは大きく異なる。

DOI： 10.5190/tga.75.2_78

CiNii Research

Cave occupations in Southeastern Arabia in the second millennium BCE: Excavation at Mugharat al-Kahf, North-Central Oman

Miki T., Kuronuma T., Kitagawa H., Kondo Y.

Arabian Archaeology and Epigraphy 33 巻 ( 1 ) 頁： 85 - 107 2022年11月

出版者・発行元：Arabian Archaeology and Epigraphy

This paper reports the results of excavation at Mugharat al-Kahf (WTN01) in Wādī Tanūf, North-central Oman. It also provides information on the nonmortuary and nonsedentary activities in central Oman during the Wādī Sūq period (2000–1600 BCE), as the subsistence and social arrangements of this period are the subject of much debate. Previous surveys had discovered a substantial amount of Wādī Sūq pottery at the site. This project took forward the excavation for further exploration. The excavation at Test Pit 1 identified Layers Ia and Ib, wherein pottery sherds, charred date stones and other samples for radiocarbon dating were discovered. These prove the cave's occupation during the early third millennium BCE, early second millennium BCE and the Islamic period. The analysis of artefacts and floral remains provided insights into the sojourn, storage and consumption of dates in the cave, and the mobile lifestyle in central Oman.

DOI： 10.1111/aae.12210

Scopus

Luminescence dating of Holocene sediment cores from a wave-dominated and mountainous river delta in central Vietnam

Qiaola S., Nguyen T.M.L., Ta T.K.O., Nguyen V.L., Gugliotta M., Saito Y., Kitagawa H., Nakashima R., Tamura T.

Quaternary Geochronology 70 巻 2022年5月

出版者・発行元：Quaternary Geochronology

Sediments of river deltas provide valuable records of past coastal environments. Optically-stimulated luminescence (OSL) dating has become an alternative to radiocarbon dating for constraining the sediment chronology in large deltas that allow for sufficient sunlight bleaching of sediments during the fluvial transport. However, its applicability to smaller deltas with mountainous riverine systems has not been confirmed yet. To check this, we examine multiple signals from two Holocene sediment cores in the wave-dominated Thu Bon River delta in central Vietnam. Two cores were collected, respectively, 3.9 km and 1.2 km inland from the present shoreline and both show a >-25-m thick succession of coarsening-upward mud to sand deposits. Coarse grains (180–250 μm in diameter) of quartz and K-feldspar, and fine grains (4–11 μm in diameter) of quartz and polymineral were extracted from the upper and lower parts of the cores for multi-grain measurements of quartz OSL, and of feldspar infrared-stimulated luminescence (IRSL) at 50 °C (IR50) and post-IR IRSL at 175 °C (pIRIR175) to determine burial ages. In addition, facies analysis and radiocarbon dating were conducted. The landward core consists of transgressive to early regressive estuarine and prodelta facies, which is overlain by a sandy beach-shoreface facies. The seaward core consists of a relatively simple shallowing-upward succession from muddy prodelta facies to sandy beach-shoreface facies. All luminescence ages except for pIRIR175 of fine grains are mostly consistent with the radiocarbon ages. Instead, pIRIR175 ages of fine grains are significantly overestimated with variable offsets. OSL and IR50 of fine grains provide reasonable age estimates, as these grains were likely well bleached during the transport even along a short and steep mountainous river. Consistent age estimates of all signals from sand indicate that sand was well-bleached in the beach and shoreface owing to the frequent sediment reworking by waves and currents. These results support the hypothesis that luminescence dating is applicable to Holocene wave-dominated deltas and reiterate that comparing different luminescence signals is an effective way to check reliability of the age estimates in environments where the sunlight bleaching is not ensured.

DOI： 10.1016/j.quageo.2022.101277

Scopus

コア堆積物の解析にもとづく菊川低地の形成過程

堀和明, 石井祐次, 田村亨, 佐藤善輝, 稲崎富士, 中西利典, 北川浩之, 廣内大助, 三笘加葉, 松多信尚

日本地理学会発表要旨集 2022s 巻 ( 0 ) 頁： 158 2022年

記述言語：日本語出版者・発行元：公益社団法人日本地理学会

はじめに　南海トラフで繰り返し生じてきた地震にともなう地殻変動や津波履歴の検討には，沿岸に分布する海成段丘や沖積低地といった地形やそれらを構成する堆積物が用いられてきた．これらの地形や堆積物の解析・分析を通して，地殻変動や津波に関する情報を抽出するためには，地形・地層の形成過程と氷河性海水準変動との関係を明らかにしておく必要がある．本発表では，遠州灘東部に位置する菊川低地の浜堤・砂丘上において採取したコア堆積物の解析・分析結果を報告するとともに，先行研究（鹿島ほか，1985；杉山ほか，1988）や既存資料（中部電力，2020）を踏まえた上で菊川低地の形成過程を論じる．調査対象地と方法　菊川は流域面積158 km2の小規模河川で，下流域において，東を牧之原台地，西を小笠山丘陵に限られる幅の狭い沖積低地を形成する．河口付近には最大標高20–30 mに達する海岸砂丘が分布する．　浜堤・砂丘上に位置する掛川市千浜でKICコア（現海岸線から2 km内陸，標高17.62 m，掘削長21 m），同市三俣でKIMコア（現海岸線から1.7 km内陸，標高7.87 m，掘削長23.3 m）を，機械ボーリングにより採取した．コア堆積物については，写真撮影，軟X線写真撮影，色調，かさ密度，砂泥比の測定をおこなった．また，DirectAMSおよび名古屋大にて放射性炭素年代測定を実施した．なお，KICコアについては，産総研で長石のOSL（IRSLおよびpost-IR IRSL）年代を測定した．結果と考察　KICコアは最下部約2 mにみられた泥層を除き，中粒砂を主体とする砂層で構成されていた．深度0–8 m付近の砂層は他の層準に比べて淘汰がよい傾向にあった．また，深度15.6–19 m付近の砂層には礫が含まれており，深度16.5 m付近では礫が35%程度を占めていた．最下部の泥層は貝殻片を含み，珪藻について概査をしたところ干潟に特徴的な種が多くみられた．　KIMコアは，深度0–7 mが砂層で構成され，その下位にある深度7–16 mは礫を含む砂層を主体とするが，深度7–8.4，9–9.3，10–10.6，15.6–16 mはおもに礫からなっていた．深度16–22 mは貝殻片や有機物を含む泥層からなっており，深度22 mで更新統と考えられる泥層に達した．　年代測定結果から，KICコアでは約6 ka頃に泥層を覆う砂層の堆積が始まったと考えられる．標高0 m付近のOSL年代値は放射性炭素年代値とも整合的であり，6–3.7 kaにかけて砂が平均7 m/kyrで堆積したことを示唆する．一方，KIMコアでは，7.9–7.6 ka頃に砂層の堆積が急激に生じたと推定される．両地点よりも陸側では，泥層中にK-Ahテフラが確認されており，その分布標高は−5–−7 mである（中部電力，2020）．　KIMやKICコア堆積物にみられた砂層とその下位の泥層の境界深度は，KIMのほうがKICに比べて深い．既存の地質断面図（鹿島ほか，1985；杉山ほか，1988）においてもこれらに対比される砂層と泥層の境界深度が陸側に向かって浅くなる特徴がみられる．完新世の海進時における海岸線の向きが現在とほぼ同じ（西北西―東南東）と仮定すると，バリアと考えられる砂礫堆が海水準上昇にともなって陸側に移動しながら下位の泥層を覆っていった可能性がある．また，この砂礫堆はKIC付近で陸側への移動を止め，より陸側には浅い水域が広がり，K-Ahを含む泥層が堆積していったと考えられる．　両コアには礫を含む砂層や礫層が確認されたが，礫を含む砂層の上限はKIMコアで標高約1.2 m，KICコアで標高約2.1 mであった．堆積物の特徴と海水準との関係を詳細に明らかにすることで，今後，地殻変動量を定量的に見積もることができるだろう．謝辞　放射性炭素年代測定の一部は，名古屋大学宇宙地球環境研究所でおこなわれた．本研究は科研費（課題番号：18H00765，18H01310）の助成を受けたものである．

DOI： 10.14866/ajg.2022s.0_158

CiNii Research

The spatio-temporal structure of the Lateglacial to early Holocene transition reconstructed from the pollen record of Lake Suigetsu and its precise correlation with other key global archives: Implications for palaeoclimatology and archaeology

Nakagawa T., Tarasov P., Staff R., Bronk Ramsey C., Marshall M., Schlolaut G., Bryant C., Brauer A., Lamb H., Haraguchi T., Gotanda K., Kitaba I., Kitagawa H., van der Plicht J., Yonenobu H., Omori T., Yokoyama Y., Tada R., Yasuda Y.

Global and Planetary Change 202 巻 2021年7月

出版者・発行元：Global and Planetary Change

Leads, lags, or synchronies in climatic events among different regions are key to understanding mechanisms of climate change, as they provide insights into the causal linkages among components of the climate system. The well-studied transition from the Lateglacial to early Holocene (ca. 16–10 ka) contains several abrupt climatic shifts, making this period ideal for assessing the spatio-temporal structure of climate change. However, comparisons of timings of past climatic events among regions often remain hypothetical because site-specific age scales are not necessarily synchronised to each other. Here we present new pollen data (n = 510) and mean annual temperature reconstruction from the annually laminated sediments of Lake Suigetsu, Japan. Suigetsu's 14C dataset is an integral component of the IntCal20 radiocarbon calibration model, in which the absolute age scale is established to the highest standard. Its exceptionally high-precision chronology, along with recent advances in cosmogenic isotope studies of ice cores, enables temporally coherent comparisons among Suigetsu, Greenland, and other key proxy records across regions. We show that the onsets of the Lateglacial cold reversal (equivalent to GS-1/Younger Dryas) and the Holocene were synchronous between East Asia and the North Atlantic, whereas the Lateglacial interstadial (equivalent to GI-1/Bølling-Allerød) started ca. two centuries earlier in East Asia than in the North Atlantic. Bimodal migration (or ‘jump’) of the westerly jet between north and south of the Tibetan plateau and Himalayas may have operated as a threshold system responsible for the abruptness of the change in East and South (and possibly also West) Asia. That threshold in Asia and another major threshold in the North Atlantic, associated with switching on/off of the Atlantic meridional overturning circulation (AMOC), were crossed at different times, producing a multi-centennial asynchrony of abrupt changes, as well as a disparity of climatic modes among regions during the transitional phases. Such disparity may have disturbed zonal circulation and generated unstable climate during transitions. The intervening periods with stable climate, on the other hand, coincided with the beginnings of sedentary life and agriculture, implying that these new lifestyles and technologies were not rational unless climate was stable and thus, to a certain extent, predictable.

DOI： 10.1016/j.gloplacha.2021.103493

Scopus

Breakthrough in purification of fossil pollen for dating of sediments by a new large-particle on-chip sorter

Kasai Y., Leipe C., Saito M., Kitagawa H., Lauterbach S., Brauer A., Tarasov P.E., Gosla T., Arai F., Sakuma S.

Science Advances 7 巻 ( 16 ) 2021年4月

記述言語：英語出版者・発行元：Science Advances

Particle sorting is a fundamental method in various fields of medical and biological research. However, existing sorting applications are not capable for high-Throughput sorting of large-size (100 micrometers) particles. Here, we present a novel on-chip sorting method using traveling vortices generated by on-demand microjet flows, which locally exceed laminar flow condition, allowing for high-Throughput sorting (5 kilohertz) with a record-wide sorting area of 520 micrometers. Using an activation system based on fluorescence detection, the method successfully sorted 160-micrometer microbeads and purified fossil pollen (maximum dimension around 170 micrometers) from lake sediments. Radiocarbon dates of sorting-derived fossil pollen concentrates proved accurate, demonstrating the method's ability to enhance building chronologies for paleoenvironmental records from sedimentary archives. The method is capable to cover urgent needs for high-Throughput large-particle sorting in genomics, metabolomics, and regenerative medicine and opens up new opportunities for the use of pollen and other microfossils in geochronology, paleoecology, and paleoclimatology.

DOI： 10.1126/sciadv.abe7327

Scopus

PubMed

アラビア半島におけるホモ・サピエンスの定着:オマーン内陸部ワディ・タヌーフ1号洞穴遺跡の土層堆積状況と年代について

近藤康久, 北川浩之

「パレオアジア文化史学」計画研究A03　2020年度研究成果報告書(PaleoAsia Project Series 31　) 31 巻頁： 1 - 4 2021年

ホモ・サピエンスの拡散モデルの構築に向けた過去25万年間の気候変動の再現

北川浩之

「パレオアジア文化史学」計画研究A03　2020年度研究成果報告書(PaleoAsia Project Series ) 34 巻頁： 13 - 17 2021年

Revised chronology of the ICDP Dead Sea deep drill core relates drier-wetter-drier climate cycles to insolation over the past 220 kyr

Goldstein S.L., Kiro Y., Torfstein A., Kitagawa H., Tierney J., Stein M.

Quaternary Science Reviews 244 巻 2020年9月

出版者・発行元：Quaternary Science Reviews

The Dead Sea Deep Drilling Project drilled 456 meters into the deepest floor of the Dead Sea and recovered a record of the past ∼220 kyr of the Levant hydroclimate history, that is, Marine Isotope Stages 1–7, including the last three interglacials and the last two glacials. We present an updated chronology of the core from DSDDP Hole 5017-1-A, from the Dead Sea's deepest basin, that refines our previous chronology (Torfstein et al. 2015) based on new information. The updated chronology uses the following approaches: (1) radiocarbon ages of Kitagawa et al. (2017); (2) correlation of specific layers in the core with U–Th-dated sediments on the Dead Sea margin, particularly during the interval of glacial Lake Lisan (MIS 2,3,4); (3) tuning of the δ18O data of DSDDP core aragonite to the U–Th dated oxygen isotopes of regional cave speleothems; and (4) tuning of the DSDDP aragonite δ18O data to summer insolation curves when the cave δ18O chronology is less clear. The updated chronology reveals a strong relationship between the sedimentary facies comprising the core and Northern Hemisphere summer insolation variations. It shows that sequences of sediments marking drier/wetter/drier climate conditions in the lake's watershed (e.g., salt/muds/salt, respectively) appear across the flank/peak/flank segments of several summer insolation peaks. In particular, the transition from drier to wetter sedimentary facies during mid-latitude insolation peaks coincides with the intervals of sapropel conditions in the Mediterranean, reflecting enhanced Nile flow due to intense African monsoonal conditions, and marking the impact of the tropical precession cycles on Eastern Mediterranean hydroclimate. This pattern was lost during MIS 2,3,4, when mostly sequences of primary aragonite are punctuated by gypsum precipitation during Heinrich events, marking the strong impact of the North Atlantic on the last glacial Levant hydroclimate.

DOI： 10.1016/j.quascirev.2020.106460

Scopus

A protocol for using attenuated total reflection Fourier-transform infrared spectroscopy for pre-screening ancient bone collagen prior to radiocarbon dating

Naito Y.I., Yamane M., Kitagawa H.

Rapid Communications in Mass Spectrometry 34 巻 ( 10 ) 頁： e8720 2020年5月

記述言語：英語出版者・発行元：Rapid Communications in Mass Spectrometry

Rationale: Pre-screening of bone collagen quality is important to reduce the cost for analyses such as radiocarbon (14C) dating with accelerator mass spectrometry in archaeological studies. We developed a pre-screening protocol based on attenuated total reflection (ATR) Fourier-transform infrared spectroscopy (FTIR) for assessing the chemical composition and mineralogy of ancient bone samples. Methods: ATR-FTIR measurements were performed on bulk bones of diverse origin and age before collagen extraction. The percentage nitrogen of bulk bones, as well as the weight percentage, and the percentage carbon and nitrogen of extracted organic matter were noted. Several machine learning algorithms were applied to the spectral data and compared for their efficacy in screening for well preserved collagen. Results: The results showed that (a) the first derivative of the spectral data was better suited to screening than the raw FTIR data, especially for a wider spectral range and (b) certain classification algorithms [e.g. gradient boosting machine (GBM)] were able to efficiently predict the degree of preservation in bone samples. Conclusions: This pre-screening protocol can serve as a fast, concise and inexpensive pre-screening tool for determining relative degrees of preservation before collagen extraction and subsequent 14C dating. The screening power based on the machine learning techniques can be further improved by accumulating the FTIR spectral data of bones.

DOI： 10.1002/rcm.8720

Web of Science

Scopus

PubMed

ホモ・サピエンスのアジアへの拡散モデルの構築（2）―気候・環境への適応国際共著

北川浩之

パレオアジア文化史学, 計画研究A03 令和元年度研究報告書 2019 巻頁： 33 - 36 2020年

パキスタンThar砂漠堆積物のOSL年代による石器年代の制約国際共著

田村亨, 北川浩之

パレオアジア文化史学, 計画研究A03 令和元年度研究報告書 2019 巻頁： 23 - 28 2020年

ホモ・サピエンスのアジアへの拡散モデルの構築（1）－気候の類似性

北川浩之

パレオアジア文化史学, 計画研究A03 平成30年度研究報告書 (PaleoAsia Project Serise) 20 巻頁： 39 - 44 2019年

Radiocarbon chronology of the dsddp core at the deepest floor of the dead sea

Kitagawa H., Stein M., Goldstein S.L., Nakamura T., Lazar B.

Radiocarbon 59 巻 ( 2 ) 頁： 383 - 394 2017年4月

出版者・発行元：Radiocarbon

This study establishes the chronological framework of the sedimentary sequence deposited Dead Sea, ICDP 5017-1, Radiocarbon chronology during the past 50 ka at the deepest part of the Dead Sea (the ICDP 5017-1 site), which was recovered by the Dead Sea Deep Drilling Project (DSDDP) under the auspices of the International Continental Scientific Drilling Program (ICDP). The age-depth model is constructed using 3814C dates of terrestrial plant remains in a composite 150-m-long profile, generated by anchoring 32 marker layers identified in five cores. The sedimentary records at the ICDP 5017-1 site fills gaps in those obtained from the exposed sections at the high margins of the lake, particularly in times of lake-level retreat, and allows for a high-resolution comparison between the lake’s margins and deepest floor.

DOI： 10.1017/RDC.2016.120

Scopus

Radiocarbon Chronology of the DSDDP Core at the Deepest Floor of the Dead Sea 査読有り

Kitagawa, H., M. Stein, S. L. Goldstein, T. Nakamura, B. Lozar

Radiocarbon 59 巻 ( 2 ) 頁： 383-394 2017年

Evidences for centennial dry periods at ~3300 and ~2800 cal. yr BP from microfacies analyses of the Dead Sea sediments

1. I. Neugebauer, A. Brauer, M. J. Schwab, P. Dulski, U. Frank, E. Hadzhiivanova, H. Kitagawa, T. Litt, V. Schiebel, N. Taha and N. D Waldmann, DSDDP Scientific Party

The Holocene 2015年

Quantitative analysis of intraspecific variations in the carbon and oxygen isotope compositions ofthe modern cool-temperate brachiopod Terebratulina

2. H. Takayanagi, R. Asami, T. Otake, O. Abe, T. Miyajima, H. Kitagawa, Y. Iryu

Geochimica et Cosmochimica Acta 2015年

Characteristics of 14C and 13C of carbonate aerosols in dust storm events in China 査読有り

( 164-165 ) 頁： 297-303 2015年

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