{"created":"2025-02-21T04:30:17.310928+00:00","id":2008643,"links":{},"metadata":{"_buckets":{"deposit":"fd04fd95-fa63-4994-ae2a-897f80e4dcb2"},"_deposit":{"created_by":41,"id":"2008643","owners":[41],"pid":{"revision_id":0,"type":"depid","value":"2008643"},"status":"published"},"_oai":{"id":"oai:hiroshima.repo.nii.ac.jp:02008643","sets":["1730444907710"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_title":"Precise determination of phase relations in pyrolite across the 660 km seismic discontinuity by in situ X-ray diffraction and quench experiments","subitem_title_language":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Nishiyama, Norimasa","creatorNameLang":"en"}],"familyNames":[{"familyName":"Nishiyama","familyNameLang":"en"}],"givenNames":[{"givenName":"Norimasa","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Irifune, Tetsuo","creatorNameLang":"en"}],"familyNames":[{"familyName":"Irifune","familyNameLang":"en"}],"givenNames":[{"givenName":"Tetsuo","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Inoue, Toru","creatorNameLang":"en"}],"familyNames":[{"familyName":"Inoue","familyNameLang":"en"}],"givenNames":[{"givenName":"Toru","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Ando, Jun-ichi","creatorNameLang":"en"}],"familyNames":[{"familyName":"Ando","familyNameLang":"en"}],"givenNames":[{"givenName":"Jun-ichi","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Funakoshi, Ken-ichi","creatorNameLang":"en"}],"familyNames":[{"familyName":"Funakoshi","familyNameLang":"en"}],"givenNames":[{"givenName":"Ken-ichi","givenNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186499011":{"attribute_name":"Rights","attribute_value_mlt":[{"subitem_rights":"Copyright (c) 2004 Published by Elsevier Science B.V."}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_subject":"Pyrolite","subitem_subject_scheme":"Other"},{"subitem_subject":"660 km seismic discontinuity","subitem_subject_scheme":"Other"},{"subitem_subject":"Ringwoodite","subitem_subject_scheme":"Other"},{"subitem_subject":"Majorite garnet","subitem_subject_scheme":"Other"},{"subitem_subject":"In situ X-ray diffraction experiments","subitem_subject_scheme":"Other"},{"subitem_subject":"Fe–Mg partitioning","subitem_subject_scheme":"Other"},{"subitem_subject":"450","subitem_subject_scheme":"NDC"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"Mineral assemblage changes in a pyrolite composition with increasing pressure were observed by in situ X-ray diffraction and quench experiments at pressures near that of the 660 km seismic discontinuity and at a fixed temperature of 1600 °C. According to results obtained by in situ X-ray diffraction experiments, ringwoodite (Rw) was observed with majorite garnet and CaSiO3-rich perovskite at pressures of about 20–22 GPa. Dissociation of ringwoodite to MgSiO3-rich perovskite and magnesiowüstite (Mw) was completed at 22.0±0.2 GPa according to Matsui et al.'s periclase pressure scale, and at 21.7±0.1 GPa according to Shim et al.'s gold pressure scale. Majorite garnet persisted to about 24 GPa where pyrolite transformed to a lower mantle mineral assemblage, i.e. MgSiO3-perovskite, CaSiO3-rich perovskite, and magnesiowüstite. Thus, majorite garnet coexists with the lower mantle assemblage at pressures of about 22–24 GPa. In the quench experiments, an assemblage of MgSiO3-perovskite, magnesiowüstite, CaSiO3-rich perovskite, and majorite garnet was synthesized at 22.5 GPa and 1600 °C, in which Mg-perovskite contained 2.8 wt.% Al2O3, and was significantly poorer in Fe than coexisting magnesiowüstite. The Fe–Mg partition coefficient between Mg-perovskite and magnesiowüstite including ferric iron (Kapp=0.27±0.06) is very close to that in the Al-free system, which suggests that these P–T conditions are in the vicinity of those of ringwoodite decomposition. Both the results of in situ X-ray diffraction and quench experiments in the present study yield a convergent result that ringwoodite decomposes into Mg-perovskite and magnesiowüstite before the garnet-to-perovskite transition at 1600 °C in pyrolite. The relation between the Al content in Mg-perovskite and Kapp in pyrolite is non-linear, which is consistent with the Fe–Mg partitioning between Mg-perovskite and magnesiowüstite previously reported for a simpler MgO–FeO–Al2O3–SiO2 system.","subitem_description_language":"en"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_publisher":"Elsevier"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_source_identifier":"0031-9201","subitem_source_identifier_type":"ISSN"},{"subitem_source_identifier":"AA00773963","subitem_source_identifier_type":"NCID"}]},"item_1617187024783":{"attribute_name":"Page Start","attribute_value_mlt":[{"subitem_start_page":"185"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-06-15","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"199","bibliographicPageStart":"185","bibliographicVolumeNumber":"143-144","bibliographic_titles":[{"bibliographic_title":"Physics of The Earth and Planetary Interiors"},{"bibliographic_title":"Physics of The Earth and Planetary Interiors"}]}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_b1a7d7d4d402bcce","subitem_version_type":"AO"}]},"item_1617353299429":{"attribute_name":"Relation","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1016/j.pepi.2003.08.010","subitem_relation_type_select":"DOI"}},{"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://dx.doi.org/10.1016/j.pepi.2003.08.010","subitem_relation_type_select":"DOI"}}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-03-18"}],"displaytype":"simple","filename":"PEPI_143-144_185.pdf","filesize":[{"value":"1.6 MB"}],"mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://hiroshima.repo.nii.ac.jp/record/2008643/files/PEPI_143-144_185.pdf"},"version_id":"cf354d39-cfb6-4186-8976-eb6e1046bd41"}]},"item_1732771732025":{"attribute_name":"旧ID","attribute_value":"21537"},"item_title":"Precise determination of phase relations in pyrolite across the 660 km seismic discontinuity by in situ X-ray diffraction and quench experiments","item_type_id":"40003","owner":"41","path":["1730444907710"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-18"},"publish_date":"2023-03-18","publish_status":"0","recid":"2008643","relation_version_is_last":true,"title":["Precise determination of phase relations in pyrolite across the 660 km seismic discontinuity by in situ X-ray diffraction and quench experiments"],"weko_creator_id":"41","weko_shared_id":-1},"updated":"2025-02-22T04:02:39.085798+00:00"}