{"created":"2021-03-01T06:06:55.075435+00:00","id":3174,"links":{},"metadata":{"_buckets":{"deposit":"4620e520-a841-499b-8a2a-67555bc346b6"},"_deposit":{"id":"3174","owners":[],"pid":{"revision_id":0,"type":"depid","value":"3174"},"status":"published"},"_oai":{"id":"oai:niigata-u.repo.nii.ac.jp:00003174"},"item_5_alternative_title_1":{"attribute_name":"\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb","attribute_value_mlt":[{"subitem_alternative_title":"Arsenic\u3000concentration in hot\u3000spring\u3000waters\u3000from\u3000the\u3000Niigata Plain and\u3000Shinji\u3000Lowland, Japan. : Source supply of arsenic in arsenic contaminated ground water problem, Part 2"}]},"item_5_biblio_info_6":{"attribute_name":"\u66f8\u8a8c\u60c5\u5831","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2001-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"22","bibliographicPageStart":"11","bibliographicVolumeNumber":"55","bibliographic_titles":[{"bibliographic_title":"\u5730\u7403\u79d1\u5b66"},{"bibliographic_title":"\u5730\u7403\u79d1\u5b66","bibliographic_titleLang":"en"}]}]},"item_5_description_4":{"attribute_name":"\u6284\u9332","attribute_value_mlt":[{"subitem_description":"The purpose of this study is to investigate the distribution of arsenic concentration in hot spring waters from the Niigata Plain, central Japan and the Shinji Lowland, western Japan and to consider the origin of arsenic supply for groundwaters in the modern sedimentary basins. The hot springs distributed in the inner area of the Niigata Plain have low temperature (11 to 40\u2103) and low As content (0.1 to 10ppb). However, hot springs in the inner area of the Shinji Lowland have middle to high temperature (40 to 85\u2103) and middle to high As content (10 to 114ppb). The As contents in the Shinji Lowland hot springs are about ten to hundred times higher than those in the Niigata Plain. The hot spring distribution pattern, geology, and the arsenic content of hot spring waters closely depend on geological structure under the both plains. In the granitoid and green tuff areas, the temperature and arsenic concentration of hot spring waters are high compared to the Tertiary and Quaternary sediment areas. The hot springs are distributed along deep fracture zones at the margins of the plains. It is considered that the hot spring waters is the mixture of underground geothermal water from the basement fractures and ground waters of meteoric origin. Arsenic is eluted from the basement rocks into the geothermal water. In the eastern part of the Shinji Lowland hot spring waters with high temperature and high concentration of arsenic appear at hot springs upwelling from depth near the basement rocks. This shows that the arsenic concentration is controlled by the mixing rates of the meteoric water and geothermal water. The low arsenic concentration in the Niigata Plain compared with the Shinji Lowland is mainly due to the low arsenic content of the geothermal water. It is also due to the tick sedimentary rocks overlying basement rocks which reaches 7,000m or more below the 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