{"created":"2023-07-25T08:12:27.564790+00:00","id":12809,"links":{},"metadata":{"_buckets":{"deposit":"6b9eff83-1285-48b0-ba88-741eeb19dad1"},"_deposit":{"created_by":18,"id":"12809","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"12809"},"status":"published"},"_oai":{"id":"oai:ir.kagoshima-u.ac.jp:00012809","sets":["54:55"]},"author_link":["124053"],"item_5_date_6":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2012-03-15","subitem_date_issued_type":"Issued"}]},"item_5_date_granted_54":{"attribute_name":"学位授与年月日 ","attribute_value_mlt":[{"subitem_dategranted":"2012-03-15"}]},"item_5_degree_grantor_53":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"鹿児島大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"17701","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_5_degree_name_42":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士(理学)","subitem_degreename_language":"ja"},{"subitem_degreename":"Doctor of Philosophy in Science","subitem_degreename_language":"en"}]},"item_5_description_17":{"attribute_name":"ファイル（説明）","attribute_value_mlt":[{"subitem_description":"学位論文の要旨, 学位論文本文","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_5_description_4":{"attribute_name":"要約(Abstract)","attribute_value_mlt":[{"subitem_description":"It is well known that the mineralization in Japan is closely related to magmatism. However, the arguments have remained on the geochemical contribution of magma. In this thesis, the geochemical features of igneous rocks are examined for Neogene granitoids and Pliocene to Holocene volcanics in Kyushu, focusing on the anions. Assuming that hydrothermal fluid emanates from magma, I tried to understand the behavior of anions of magma from plutonic and volcanic rocks. The first chapter is occupied by introduction and summary of the present research. The second chapter is spent on Neogene granitoids in Kyushu. Kyushu is divided into three petrographic zones (Outer zone 1, Outer zone 2, and Inner zone from the Pacific Ocean to the Eurasian Continental side). These zones are identified by accompanied mineralizations; Sn-W, Sn-base metal and base metal, respectively, and also by increasing magnetic susceptibility, increasing S isotopic ratio and increasing fHCl/fHF from the Pacific Ocean to the Eurasian Continental side. The evidences suggest that the magmas in the Outer zone have mellowed in the accretionary prism and those in the Inner zone have been generated in the lower crust, and that the fluid with W fluor-complex was transported from magma in the Outer zone and base metal chloro-complex in the Inner zone. Halogen elements played an important role in ore transportation. On the other hand, sulfur behaved in another way. Oxidized sulfur species discharge from magma in the Inner zone, but in plutonic rocks of the Outer zone, reduced sulfur species remain in magma and precipitate as sulfide.\n\nThe third chapter is spent discussing the Pliocene to Holocene volcanic rocks in the Hokusatsu gold mining district of Kagoshima Prefecture. In the first section, I discuss the geochemical features of volcanic rocks in the whole of the Hokusatsu gold mining district. It is said that these magma might be generated in the lower crust (Hosono et al., 2008). The geochemistry of Nb, Y, Th and other trace elements suggest that two kinds of volcanism exist in this district; islands arc and within plate types. The zonation of islands arc type suggests that the volcanic front and trench have jumped to the eastern side intermittently, and that many epithermal gold deposits were formed associated with chlorine rich magma along the subduction front. In the second section, the dacitic magma in the Hishikari gold mining area in the Hokusatsu gold district is discussed, based on the geochemistry of the volcanic rock. Gold was transported through two steps. Au chloro-complex and oxidized sulfur species (SO_2) were discharged individually from oxidized dacitic magma. After emanation from magma, Au chloro-complex was decomposed and SO_2 was reduced to H_2S, in the overlying reduced Shimanto Supergroup. The gold separated from chlorine connected with H_2S to form Au bisulfide complex, which would be transported through Shimanto Supergroup. Near the surface, the ore fluid mixed with oxic meteoric water, and Au bisulfide complex was decomposed and precipitated as native gold or\nelectrum which forms the Hishikari epithermal gold ore deposits. The fourth chapter is a general overview, and discusses features of the magma both from plutonic and volcanic rocks, from the aspect of mineralization mechanism; origin, transportation, and precipitation of metal. That is, the magma accompanied even with hypogene or supergene ore deposits are characterized by the large contribution of anions such as halogen elements and sulfur.","subitem_description_language":"en","subitem_description_type":"Other"},{"subitem_description":"理工学研究科博士論文 (理学) ; 学位取得日: 平成24年3月15日","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_5_dissertation_number_55":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"乙理工論第61号"}]},"item_5_publisher_23":{"attribute_name":"公開者・出版者","attribute_value_mlt":[{"subitem_publisher":"鹿児島大学","subitem_publisher_language":"ja"},{"subitem_publisher":"Kagoshima University","subitem_publisher_language":"en"}]},"item_5_subject_15":{"attribute_name":"NDC","attribute_value_mlt":[{"subitem_subject":"450","subitem_subject_scheme":"NDC"}]},"item_5_text_44":{"attribute_name":"備考","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"指導教員: 小林哲夫, 根建心具"}]},"item_5_text_52":{"attribute_name":"学位番号","attribute_value_mlt":[{"subitem_text_value":"理工論第61号"}]},"item_5_version_type_14":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"古澤, 美由紀","creatorNameLang":"ja"},{"creatorName":"フルサワ, ミユキ","creatorNameLang":"ja-Kana"},{"creatorName":"Furusawa, Miyuki","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"124053","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":"2016-10-31"}],"displaytype":"detail","filename":"rikouron61.pdf","filesize":[{"value":"781.7 kB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"label":"rikouron61.pdf","objectType":"abstract","url":"https://ir.kagoshima-u.ac.jp/record/12809/files/rikouron61.pdf"},"version_id":"26449f3c-bc16-4bfe-8736-22ddcccba7bd"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-10-31"}],"displaytype":"detail","filename":"Diss_FURUSAWA_Miyuki_2012.pdf","filesize":[{"value":"9.8 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"label":"Diss_FURUSAWA_Miyuki_2012.pdf","objectType":"fulltext","url":"https://ir.kagoshima-u.ac.jp/record/12809/files/Diss_FURUSAWA_Miyuki_2012.pdf"},"version_id":"22a5d440-f502-4e7a-b4ff-6c11d25e4d20"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"九州の鉱床を伴う新第三紀および第四紀火成岩の地球化学","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"九州の鉱床を伴う新第三紀および第四紀火成岩の地球化学","subitem_title_language":"ja"},{"subitem_title":"Geochemistry of igneous rocks associated with ore deposits from Neogene to Quaternary periods in Kyushu","subitem_title_language":"en"},{"subitem_title":"キュウシュウ ノ コウショウ オ トモナウ シン ダイサンキ オヨビ ダイヨンキ カセイガン ノ チキュウ カガク","subitem_title_language":"ja-Kana"}]},"item_type_id":"5","owner":"18","path":["55"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2015-02-18"},"publish_date":"2015-02-18","publish_status":"0","recid":"12809","relation_version_is_last":true,"title":["九州の鉱床を伴う新第三紀および第四紀火成岩の地球化学"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2024-06-12T07:10:27.087844+00:00"}