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The Triassic sedimentary fades of mudstone and carbonates show deposition in offshore to hemiplegic environments. The rare earth element (REE) pattern of the Permian and Triassic mudstones suggests uniformity correlatable to average shale. The major element geochemistry of the Early Triassic Griesbachian-early Smithian mudstones indicates a sediment supply from strongly weathered sources with the chemical index of alteration (CIA) values of 76-81. However, the mudstones in the late Smithian show weakly weathered sources with CIA values of 68-74. The lower part of the Middle Triassic Anisian mudstones return to Early Triassic paleoweathering levels. There are no significant relationships among lithofacies, the grain size of the sediments, and CIA values. Thus, the abrupt change of the degree of paleoweathering in the Early Triassic, late Smithian time, suggests a dramatic decrease in continental weathering, which is related to a predominantly arid climate in the northern marginal area of Gondwana. (C) 2013 Elsevier Ltd. 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Continental weathering in the Early Triassic in Himalayan Tethys, central Nepal: Implications for abrupt environmental change on the northern margin of Gondwanaland
http://hdl.handle.net/10091/00021459
1e3e9b01-d9be-4dda-bd88-ab73c5797686
名前 / ファイル | ライセンス | アクション | |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-05-16 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Continental weathering in the Early Triassic in Himalayan Tethys, central Nepal: Implications for abrupt environmental change on the northern margin of Gondwanaland | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Triassic | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Tethys | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Chemical weathering | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Climate change | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Gondwana | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Yoshida, Kohki
× Yoshida, Kohki× Kawamura, Toshio× Suzuki, Shigeyuki× Regmi, Amar Deep× Gyawali, Babu Ram× Shiga, Yuka× Adachi, Yoshiko× Dhital, Megh Raj |
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信州大学研究者総覧へのリンク | ||||||
氏名 | Yoshida, Kohki | |||||
URL | http://soar-rd.shinshu-u.ac.jp/profile/ja.umThOUkh.html | |||||
出版者 | ||||||
出版者 | PERGAMON-ELSEVIER SCIENCE LTD | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | JOURNAL OF ASIAN EARTH SCIENCES.79, Part A:288-301(2014) | |||||
書誌情報 |
JOURNAL OF ASIAN EARTH SCIENCES 巻 79, p. 288-301, 発行日 2014-01-05 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The geochemistry of Triassic mudstones in the Himalayan Tethys sequence, central Nepal, was studied with respect to changes in sedimentary facies, grain size, and source rocks. The Triassic sedimentary facies of mudstone and carbonates show deposition in offshore to hemiplegic environments. The rare earth element (REE) pattern of the Permian and Triassic mudstones suggests uniformity correlatable to average shale. The major element geochemistry of the Early Triassic Griesbachian-early Smithian mudstones indicates a sediment supply from strongly weathered sources with the chemical index of alteration (CIA) values of 76–81. However, the mudstones in the late Smithian show weakly weathered sources with CIA values of 68–74. The lower part of the Middle Triassic Anisian mudstones return to Early Triassic paleoweathering levels. There are no significant relationships among lithofacies, the grain size of the sediments, and CIA values. Thus, the abrupt change of the degree of paleoweathering in the Early Triassic, late Smithian time, suggests a dramatic decrease in continental weathering, which is related to a predominantly arid climate in the northern marginal area of Gondwana. | |||||
資源タイプ(コンテンツの種類) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Article | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1367-9120 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11138796 | |||||
DOI | ||||||
関連識別子 | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.jseaes.2013.09.011 | |||||
関連名称 | ||||||
関連名称 | 10.1016/j.jseaes.2013.09.011 | |||||
権利 | ||||||
権利情報 | © 2013 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
出版タイプ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
WoS | ||||||
表示名 | Web of Science | |||||
URL | http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000330604900023 |