{"_buckets": {"deposit": "f190e047-3f61-4d0b-8190-116d5d56632e"}, "_deposit": {"id": "22404", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "22404"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00022404"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Paleoenvironment and stratigraphy of cored sediments from Paitan Lake, Philippines"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2016-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "150", "bibliographicPageStart": "145", "bibliographicVolumeNumber": "27", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a\u66f8"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Paitan Lake located on the northern part of Luzon Central Plain, is a tuff ring in the Amorong monogenic volcanoes. The lake has 0.8km^2-surface area, 38.5km^2-drainage basin, and one outflow-river with a few meter of width in the northern side. In order to establish the tephrostratigraphy in Luzon Island, the Philippines, two sediment cores, PPL-1 (13m in depth) and PPL-2 (28m in depth), were obtained from this lake. These cores consisted of two units: an upper alternating bed of mud layers and peaty layers in a depth range from 0 to 6m, and a lower dark mud bed from 6 to 28m. Seven tephra layers were observed in the cored sediments. Phenocryst assemblage implies that these are originated from Pinatubo volcano located ca. 90km SW from this lake. To detect cryptotephra, initial magnetic susceptibility was measured at 2-cm interval. Soft X-ray photographs were taken to interpret deformation structures during the drilling process. Radiocarbon dates of seven plant fragments and twelve organic sediments were measured by the AMS facility of KlGAM, the Institute of Accelerator Analysis Ltd. and ISEE of Nagoya University, respectively. Inferred age for four tephra horizons is consistent with previous dates for Pinatubo eruptions. To discuss paleoenvironment changes of this lake, diatom analysis with 20-cm intervals is conducted. Attached diatoms indicating marsh or peat land have emerged in cored sediments of 0 to 3m in depth with high CN ratio. From 3.2 to 28m in depth, the freshwater planktonic diatoms become dominant species and indicete freshwater lake environment. Aulacoseira granulate is dominant in 3.2 to 6m in depth, on the other hand, deeper part than 6.6m, Aulacoseira muzzanensis is dominant. Both species may indicate changes of water depth of the lake. Furthermore, only around 25m in depth, Cyclotella radiosa is dominant. At this horizon (ca. 20 cal kBP), organic carbon content and CN ratio also increase. This signal may indicate some event at Last Glacial Maximum (LGM). 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