{"created":"2023-07-25T10:25:26.846039+00:00","id":5798,"links":{},"metadata":{"_buckets":{"deposit":"a4ba8957-d365-4f7f-9c8b-fcd868eb6f63"},"_deposit":{"created_by":3,"id":"5798","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"5798"},"status":"published"},"_oai":{"id":"oai:air.repo.nii.ac.jp:00005798","sets":["1194:1195:1196:1485"]},"author_link":["16312"],"item_10006_alternative_title_32":{"attribute_name":"別タイトル","attribute_value_mlt":[{"subitem_alternative_title":"インドネシア，パプアにおける深部グラズベルグ斑岩システムの熱水変質および流体の進化"}]},"item_10006_biblio_info_34":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2022-09-29","bibliographicIssueDateType":"Issued"},"bibliographic_titles":[{}]}]},"item_10006_date_granted_41":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2022-09-29"}]},"item_10006_degree_grantor_40":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"秋田大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"11401","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10006_degree_name_39":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（理学）"}]},"item_10006_description_27":{"attribute_name":"内容記述（抄録）","attribute_value_mlt":[{"subitem_description":"The giant Grasberg Cu-Au-(Mo) deposit is one of the world’s largest porphyry Cu\ndeposit located in Indonesia, which hosts 32 million metric tons of copper and 96 million\nounces of gold. The deposit is contained in two overlapping porphyry systems: Gajah\nTidur Cu-Mo-(Au) and Main Grasberg Cu-Au. The Grasberg Block Cave reserve that lies\nbeneath the Grasberg open pit has recently been associated with the Gajah Tidur (GT)\nporphyry that is older than the shallower Main Grasberg (MG) porphyry system. This\nstudy is intended to confirm and delineate the existence of GT porphyry in the Grasberg\nCu-Au-(Mo) deposit, decipher the hydrothermal fluid evolution, and optimize the wholerock geochemistry as well as chemical variation of GT porphyry white micas to develop exploration vectoring tools for the deep-seated porphyry Cu deposits.\nDating of hydrothermal biotite and muscovite by K-Ar method revealed that the GT\nporphyry system is ~300 k.y. older than the shallower MG porphyry system, which\nformed at 3.1 ± 0.05 Ma. The age-depth relationships between the GT and MG porphyry\nsystems suggest there was an accumulation of volcanic rocks in between the two porphyry events, associated with growth of a ~0.5 to 1 km high stratovolcano prior the formation of MG porphyry system. The configuration of alteration patterns and associated mineralization, supported by hydrothermal biotite and muscovite ages, indicates that all white mica assemblages and more than 70% of Cu, Mo, and Au contained in the Grasberg Block Cave reserve are associated with the GT porphyry system.\nSulfur isotope study shows that the evolution of GT hydrothermal fluid is initiated\nby the formation of K-feldspar-biotite at a temperature as high as 590 °C. Cooling of this\nfluid from ~460° to ~370 °C allowed the formation of white mica-dominated alteration,\nwhich is associated with various amounts of anhydrite, chlorite, chalcopyrite, and pyrite.\nBased on the anhydrite and chlorite abundances, this white mica assemblage can be subdivided into muscovite-anhydrite-chlorite and muscovite-chlorite-anhydrite, both of\nwhich contain remnant hydrothermal biotite. The muscovite-quartz ± pyrophyllite\nassemblage associated with covellite-pyrite mineralization formed in the outer part of the muscovite-anhydrite-chlorite alteration zone at a lower temperature range (340-280 °C).\nBased on mineral chemistry and infrared spectroscopy analysis, the muscoviteanhydrite-\nchlorite white micas are characterized by high Na, Fe, Ti, and V concentrations,\nand mainly display short-wave infrared Al-OH absorption wavelengths of 2,203-2,208\nnm. The muscovite-chlorite-anhydrite white micas have distinctly higher Mg content than the other two GT white mica assemblages but similar Al-OH absorption wavelengths to the muscovite-anhydrite-chlorite white micas. The muscovite-quartz ± pyrophyllite white micas have low Na, Fe, Mg, and Ti, but relatively high Si, Al, and F, and Al-OH absorption wavelengths are largely shorter than 2,202 nm. The amounts of Si and Al contained in the GT white micas allow occupancy of other cations, particularly Fe and Mg in octahedral lattice sites and cause variations in their short-wave infrared Al-OH absorption wavelengths.\nThree decades of exploration and geologic studies of the giant Grasberg Cu-Au-(Mo)\ndeposit provide information that is relevant to porphyry exploration globally. The\nexistence of GT porphyry below the shallower MG porphyry system reveals that there is\npotential for nearby porphyry deposits at depth beneath the already discovered porphyry Cu districts. Taking an example from the deep-seated GT porphyry system, the wholerock geochemical anomaly of F, V, W, and Sn, and the white mica short-wave infrared Al-OH wavelength lie in between ~2,200 and ~2,215 nm can be integrated with other geological and geophysical information to locate the centre of porphyry Cu systems.","subitem_description_type":"Other"}]},"item_10006_dissertation_number_42":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第1438号"}]},"item_10006_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.20569/00006110","subitem_identifier_reg_type":"JaLC"}]},"item_10006_publisher_28":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"秋田大学"}]},"item_10006_version_type_35":{"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":"Reza, Al Furqan"}],"nameIdentifiers":[{"nameIdentifier":"16312","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":"2022-12-06"}],"displaytype":"detail","filename":"shihakuyoushikou1438.pdf","filesize":[{"value":"205.5 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"内容要旨及び審査結果要旨","url":"https://air.repo.nii.ac.jp/record/5798/files/shihakuyoushikou1438.pdf"},"version_id":"183d9b1d-2940-422c-9f56-0502e5446761"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2022-12-06"}],"displaytype":"detail","filename":"shihakukou1438.pdf","filesize":[{"value":"20.2 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"本文","url":"https://air.repo.nii.ac.jp/record/5798/files/shihakukou1438.pdf"},"version_id":"8aa0d88c-c7e9-4c4b-a38f-56fbf4ceeddf"}]},"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":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Hydrothermal Alteration and Fluid Evolution of the Deep Grasberg Porphyry System, Papua, Indonesia","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Hydrothermal Alteration and Fluid Evolution of the Deep Grasberg Porphyry System, Papua, Indonesia"}]},"item_type_id":"10006","owner":"3","path":["1485"],"pubdate":{"attribute_name":"公開日","attribute_value":"2022-12-06"},"publish_date":"2022-12-06","publish_status":"0","recid":"5798","relation_version_is_last":true,"title":["Hydrothermal Alteration and Fluid Evolution of the Deep Grasberg Porphyry System, Papua, Indonesia"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-07-25T10:41:37.285681+00:00"}