{"_buckets": {"deposit": "33ccccae-5c00-4c3e-935a-178585817811"}, "_deposit": {"created_by": 21, "id": "1498", "owners": [21], "pid": {"revision_id": 0, "type": "depid", "value": "1498"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00001498", "sets": ["18"]}, "author_link": ["0", "0", "0"], "item_1_biblio_info_21": {"attribute_name": "書誌情報（ソート用）", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2009-09-30", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "item_1_creator_2": {"attribute_name": "著者名", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "杉崎, 彩子"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_creator_3": {"attribute_name": "フリガナ", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "スギサキ, サイコ"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_date_granted_11": {"attribute_name": "学位授与年月日", "attribute_value_mlt": [{"subitem_dategranted": "2009-09-30"}]}, "item_1_degree_grantor_5": {"attribute_name": "学位授与機関", "attribute_value_mlt": [{"subitem_degreegrantor": [{"subitem_degreegrantor_name": "総合研究大学院大学"}]}]}, "item_1_degree_name_6": {"attribute_name": "学位名", "attribute_value_mlt": [{"subitem_degreename": "博士（理学）"}]}, "item_1_description_1": {"attribute_name": "ID", "attribute_value_mlt": [{"subitem_description": "2009518", "subitem_description_type": "Other"}]}, "item_1_description_12": {"attribute_name": "要旨", "attribute_value_mlt": [{"subitem_description": "　　Marine sediments contain important archives of past ocean and climate changes,\u003cbr /\u003ebut at high latitudes, such as the polar regions, the absence of carbonate has prevented\u003cbr /\u003ethe construction of accurate chronological models. To get an age model, a method\u003cbr /\u003ewhich does not rely on carbonate is needed. In this thesis we have investigated the\u003cbr /\u003epotential of optically stimulated luminescence (OSL) dating to establish a chronology\u003cbr /\u003efor our deep sea sediment cores from the Northern Pacific area. OSL dating makes use\u003cbr /\u003eof the omnipresent quartz and feldspar grains in the sediment so there is no limitation\u003cbr /\u003ein the presence of the dosimeter. Optical dating is a widely accepted dating method for\u003cbr /\u003eterrestrial sediments, but only few studies have tested its reliability in the marine\u003cbr /\u003eenvironment.\u003cbr /\u003e　A luminescence age reflects the time that has elapsed since the sediment grains were\u003cbr /\u003elast exposed to sunlight. The luminescence age equation contains two equally\u003cbr /\u003eimportant factors: the equivalent dose and dose rate. The equivalent dose is the total\u003cbr /\u003eradiation dose that crystals (quartz, feldspar) have absorbed during burial, and the dose\u003cbr /\u003erate is the rate at which the sample was exposed to ionising radiation in the\u003cbr /\u003eenvironment. Dividing the equivalent dose by the dose rate gives the luminescence age\u003cbr /\u003eof the sample.\u003cbr /\u003e　This study is focused on testing the reliability of the optical dating method when\u003cbr /\u003eapplied to marine sediments from the Northern Pacific ocean, more specifically in\u003cbr /\u003eregions that are known for seasonal-sea ice. The aims of this thesis are (1) determine\u003cbr /\u003ethe accuracy of luminescence ages, e.g. by comparison with AMS \u003csup\u003e14\u003c/sup\u003eC dating and\u003cbr /\u003emarine oxygen isotope stratigraphy where possible, (2) produce a high resolution\u003cbr /\u003esequence of absolute ages which can describe changes in sedimentation rate through\u003cbr /\u003etime, and (3) test whether it is possible to date back to marine isotope stage 5e (MIS\u003cbr /\u003e5e).\u003cbr /\u003e　In this thesis we have made use of fine (4- 11 μm) grains of quartz extracted from the\u003cbr /\u003emarine sediment cores taken in the south-western Sea of Okhotsk, the Bering Sea and\u003cbr /\u003ethe Central Sea of Okhotsk. In the first study, a high resolution optical age dataset (64\u003cbr /\u003esamples) from the south-western Sea of.Okhotsk showed continuous ages up to 24 ka\u003cbr /\u003eand indicated clear sedimentation rate differences during glacial and interglacial\u003cbr /\u003eperiods. Also for the most northern located core in the Bering Sea (sub-arctic area), the\u003cbr /\u003eOSL ages (12 samples) could date to 64ka and the ages are in good agreement with the\u003cbr /\u003e\u003csup\u003e14\u003c/sup\u003eCage ～25ka. The OSL ages in this study are in good agreement with the \u003csup\u003e14\u003c/sup\u003eC ages.\u003cbr /\u003eIn the third study in the central Sea of Okhotsk, a test of accuracy of the OSL ages\u003cbr /\u003eback to MIS 5e was carried out. The OSL ages (40 samples) are in good agreement\u003cbr /\u003ewith the well-established oxygen isotope stratigraphy at this site back to the MIS 5e\u003cbr /\u003e(130ka). In all these studies, the luminescence characteristics of the dosimeter are\u003cbr /\u003einvestigated in detail and extensive tests of the performance in the chosen\u003cbr /\u003emeasurement protocol are presented.\u003cbr /\u003e　Despite the good agreement of the optical ages with the independent age control, it\u003cbr /\u003emust be noted that the OSL ages are largely dependent on the water content. The\u003cbr /\u003eevaluation of the appropriate water content model is discussed. It appears that the\u003cbr /\u003eobserved water content values, measured immediately after core extraction, seem to\u003cbr /\u003egive the most accurate ages.\u003cbr /\u003e　This thesis shows that OSL dating is a useful method for dating marine sediment in\u003cbr /\u003ethe North Pacific area. The data confirm that the OSL dating using fine-grain quartz\u003cbr /\u003ethat is distributed all over the ocean has very great potential in the establishment of an\u003cbr /\u003eabsolute chronology for deep sea sediments; because luminescence does not depend on the presence of carbonate for AMS \u003csup\u003e14\u003c/sup\u003eC dating, it is now likely that we can establish a\u003cbr /\u003echronology is regions of the ocean that were previously undatable.", "subitem_description_type": "Other"}]}, "item_1_description_7": {"attribute_name": "学位記番号", "attribute_value_mlt": [{"subitem_description": "総研大甲第1283号", "subitem_description_type": "Other"}]}, "item_1_select_14": {"attribute_name": "所蔵", "attribute_value_mlt": [{"subitem_select_item": "有"}]}, "item_1_select_16": {"attribute_name": "複写", "attribute_value_mlt": [{"subitem_select_item": "公開希望日以降"}]}, "item_1_select_17": {"attribute_name": "公開状況", "attribute_value_mlt": [{"subitem_select_item": "要旨のみ公開"}]}, "item_1_select_8": {"attribute_name": "研究科", "attribute_value_mlt": [{"subitem_select_item": "複合科学研究科"}]}, "item_1_select_9": {"attribute_name": "専攻", "attribute_value_mlt": [{"subitem_select_item": "16 極域科学専攻"}]}, "item_1_text_10": {"attribute_name": "学位授与年度", "attribute_value_mlt": [{"subitem_text_value": "2009"}]}, "item_1_text_20": {"attribute_name": "業務メモ", "attribute_value_mlt": [{"subitem_text_value": "2012年1月1日より複写可"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "SUGISAKI, Saiko", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2016-02-17"}], "displaytype": "simple", "download_preview_message": "", "file_order": 0, "filename": "甲1283_要旨.pdf", "filesize": [{"value": "311.9 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_11", "mimetype": "application/pdf", "size": 311900.0, "url": {"label": "要旨・審査要旨", "url": "https://ir.soken.ac.jp/record/1498/files/甲1283_要旨.pdf"}, "version_id": "091b6327-dbf2-49b5-a805-9e3106051122"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "thesis", "resourceuri": "http://purl.org/coar/resource_type/c_46ec"}]}, "item_title": "High-resolution optical dating for marine sediments from North Pacific Ocean", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "High-resolution optical dating for marine sediments from North Pacific Ocean"}, {"subitem_title": "High-resolution optical dating for marine sediments from North Pacific Ocean", "subitem_title_language": "en"}]}, "item_type_id": "1", "owner": "21", "path": ["18"], "permalink_uri": "https://ir.soken.ac.jp/records/1498", "pubdate": {"attribute_name": "公開日", "attribute_value": "2010-06-09"}, "publish_date": "2010-06-09", "publish_status": "0", "recid": "1498", "relation": {}, "relation_version_is_last": true, "title": ["High-resolution optical dating for marine sediments from North Pacific Ocean"], "weko_shared_id": -1}