当サイトでは、より良いサービスを提供するため、クッキーを利用しています。クッキーの使用に同意いただける場合は「同意」ボタンをクリックし、クッキーポリシーについては「詳細を見る」をクリックしてください。詳しくは当サイトの サイトポリシー をご確認ください。

詳細を見る...
ログイン サインアップ
言語:

WEKO3

  • トップ
  • ランキング
To

Field does not validate



インデックスリンク

インデックスツリー

  • RootNode

メールアドレスを入力してください。

WEKO

One fine body…

WEKO

One fine body…

アイテム

{"_buckets": {"deposit": "7b76479e-8016-41b8-b5a8-ae4838a837a6"}, "_deposit": {"id": "5501", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "5501"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00005501", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2021-02-01", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "225", "bibliographicPageStart": "216", "bibliographicVolumeNumber": "106", "bibliographic_titles": [{"bibliographic_title": "American Mineralogist", "bibliographic_titleLang": "ja"}, {"bibliographic_title": "American Mineralogist", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "\u003ctitle\u003eAbstract\u003c/title\u003e\n We performed decompression experiments on sulfur-bearing hydrous rhyolite magma at a temperature of 800 °C to investigate redox evolution during magma decompression. The magma was continuously decompressed from 100 MPa to 10?50 MPa at rates of 10 and 100 MPa h?1. The evolution of the ferric to total iron ratio (Fe3+/Fetotal) during decompression was investigated using XANES, and redox evolution was determined based on a thermodynamic calculation and measured Fe3+/Fetotal. Before decompression, the sample was buffered from NNO to NNO+1, and the pre-exsolved fluid phase and sulfide crystal coexisted. Sulfide crystals were found in all decompressed samples, and Fe3+/Fetotal showed a slight decrease with decompression. It was confirmed that the sample in a gold capsule was not influenced by the change in redox conditions outside of the capsule for the timescale of the decompression experiments; thus, the decompressed sample reflected the redox evolution in magma during decompression.\n\n\n Our experiments indicated that magma decompression causes a slight reduction when it includes water and sulfur. This evolution is qualitatively explained by sulfur degassing and fluid-melt redox equilibria. During the fluid-melt redox equilibria, magma is reduced if the existence of a pre-exsolved fluid phase is assumed, while the model calculation shows that magma is oxidized when it contains only water or no pre-exsolved fluid phases. This is because sulfur buffers the oxidation of magma through a reaction with oxygen in the fluid phase. Therefore, we inferred that the redox condition of magma is not oxidized during explosive volcanism with a pre-exsolved fluid phase and closed-system degassing. In contrast, if magma experiences open-system degassing, it may be oxidized, resulting in the breakdown of sulfide crystals as observed in some pyroclasts and lavas.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "Mineralogical Society of America", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.2138/am-2020-7535"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1945-3027", "subitem_source_identifier_type": "EISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Satoshi Okumura", "creatorNameLang": "ja"}, {"creatorName": "Satoshi Okumura", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Hidemi Ishibashi", "creatorNameLang": "ja"}, {"creatorName": "Hidemi Ishibashi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Shoichi Itoh", "creatorNameLang": "ja"}, {"creatorName": "Shoichi Itoh", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Akimasa Suzumura", "creatorNameLang": "ja"}, {"creatorName": "Akimasa Suzumura", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Yoshihiro Furukawa", "creatorNameLang": "ja"}, {"creatorName": "Yoshihiro Furukawa", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Takahiro Miwa", "creatorNameLang": "ja"}, {"creatorName": "Takahiro Miwa", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Hiroyuki Kagi", "creatorNameLang": "ja"}, {"creatorName": "Hiroyuki Kagi", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression", "subitem_title_language": "ja"}, {"subitem_title": "Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/5501", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "5501", "relation": {}, "relation_version_is_last": true, "title": ["Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression"], "weko_shared_id": -1}
  1. 防災科研関係論文

Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression

https://nied-repo.bosai.go.jp/records/5501
https://nied-repo.bosai.go.jp/records/5501
78d78087-df43-46b8-b9f0-10ae2345cfb4
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression
タイトル
言語 en
タイトル Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression
言語
言語 eng
著者 Satoshi Okumura

× Satoshi Okumura

ja Satoshi Okumura

en Satoshi Okumura

Search repository
Hidemi Ishibashi

× Hidemi Ishibashi

ja Hidemi Ishibashi

en Hidemi Ishibashi

Search repository
Shoichi Itoh

× Shoichi Itoh

ja Shoichi Itoh

en Shoichi Itoh

Search repository
Akimasa Suzumura

× Akimasa Suzumura

ja Akimasa Suzumura

en Akimasa Suzumura

Search repository
Yoshihiro Furukawa

× Yoshihiro Furukawa

ja Yoshihiro Furukawa

en Yoshihiro Furukawa

Search repository
Takahiro Miwa

× Takahiro Miwa

ja Takahiro Miwa

en Takahiro Miwa

Search repository
Hiroyuki Kagi

× Hiroyuki Kagi

ja Hiroyuki Kagi

en Hiroyuki Kagi

Search repository
抄録
内容記述タイプ Other
内容記述 <title>Abstract</title>
We performed decompression experiments on sulfur-bearing hydrous rhyolite magma at a temperature of 800 °C to investigate redox evolution during magma decompression. The magma was continuously decompressed from 100 MPa to 10?50 MPa at rates of 10 and 100 MPa h?1. The evolution of the ferric to total iron ratio (Fe3+/Fetotal) during decompression was investigated using XANES, and redox evolution was determined based on a thermodynamic calculation and measured Fe3+/Fetotal. Before decompression, the sample was buffered from NNO to NNO+1, and the pre-exsolved fluid phase and sulfide crystal coexisted. Sulfide crystals were found in all decompressed samples, and Fe3+/Fetotal showed a slight decrease with decompression. It was confirmed that the sample in a gold capsule was not influenced by the change in redox conditions outside of the capsule for the timescale of the decompression experiments; thus, the decompressed sample reflected the redox evolution in magma during decompression.


Our experiments indicated that magma decompression causes a slight reduction when it includes water and sulfur. This evolution is qualitatively explained by sulfur degassing and fluid-melt redox equilibria. During the fluid-melt redox equilibria, magma is reduced if the existence of a pre-exsolved fluid phase is assumed, while the model calculation shows that magma is oxidized when it contains only water or no pre-exsolved fluid phases. This is because sulfur buffers the oxidation of magma through a reaction with oxygen in the fluid phase. Therefore, we inferred that the redox condition of magma is not oxidized during explosive volcanism with a pre-exsolved fluid phase and closed-system degassing. In contrast, if magma experiences open-system degassing, it may be oxidized, resulting in the breakdown of sulfide crystals as observed in some pyroclasts and lavas.
言語 en
書誌情報 ja : American Mineralogist
en : American Mineralogist

巻 106, 号 2, p. 216-225, 発行日 2021-02-01
出版者
言語 en
出版者 Mineralogical Society of America
ISSN
収録物識別子タイプ EISSN
収録物識別子 1945-3027
DOI
関連識別子 10.2138/am-2020-7535
戻る
0
views
See details
Views

Versions

Ver.1 2023-03-31 02:33:26.376959
Show All versions

エクスポート

OAI-PMH
  • OAI-PMH JPCOAR
  • OAI-PMH DublinCore
  • OAI-PMH DDI
Other Formats
  • JSON
  • BIBTEX

Confirm


Powered by WEKO3

Change consent settings


Powered by WEKO3

Change consent settings