| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
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|
タイトル |
Mineral chemistry and P-T condition of granular and sheared peridotite xenoliths from Kimberley, South Africa: Origin of the textural variation in the cratonic mantle |
|
言語 |
en |
| 作成者 |
Katayama, Ikuo
Suyama, Yuka
Ando, Jun-ichi
Komiya, Tsuyoshi
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| アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
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権利情報 |
Copyright (c) 2008 Elsevier B.V. |
| 主題 |
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主題Scheme |
Other |
|
主題 |
Mantle xenolith |
| 主題 |
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主題Scheme |
Other |
|
主題 |
Deformation |
| 主題 |
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|
主題Scheme |
Other |
|
主題 |
Mantle metasomatism |
| 主題 |
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|
主題Scheme |
Other |
|
主題 |
Cratonic lithosphere |
| 主題 |
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主題Scheme |
NDC |
|
主題 |
430 |
| 内容記述 |
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内容記述 |
Mantle xenoliths from Kimberley, South Africa, contain texturally distinct peridotites; coarse granular to extensively sheared peridotites. Mineral chemistries of the textually distinct peridotite xenoliths indicate that these mantle rocks were equilibrated at similar P-T conditions: 44-54 kbar and 970-1130 degrees C for granular peridotites, and 41-50 kbar and 950-1080 degrees C for sheared periclotites. The Kimberley periclotites showing various deformation textures are restricted to a relatively narrow depth range (120-160 km). They display no systematic correlation between texture and estimated equilibrium pressure and temperature, whereas sheared periclotites in the Lesotho kimberlites commonly originated from greater depths and higher temperature. The large local variations in the degree of deformation in the cratonic lithosphere beneath Kimberley require pronounced weakening due to localized high water flux that can be associated with mantle metasomatism. Sheared periclotites have more depleted compositions in FeO and CaO compositions than those of granular periclotites, but have a higher orthopyroxene modal abundance and contain sodium-rich clinopyroxene, which are consistent with that extensive deformations associated with Si-rich fluid/melt metasomatism. We therefore conclude that mantle metasomatism has an important role in facilitating deformation locally within the cratonic lithosphere. and is responsible for the textural variations of peridotite xenoliths from the cratonic roots. |
|
言語 |
en |
| 出版者 |
|
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出版者 |
Elsevier Science BV |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
AO |
|
出版タイプResource |
http://purl.org/coar/version/c_b1a7d7d4d402bcce |
| 関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.lithos.2008.05.004 |
| 関連情報 |
|
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|
識別子タイプ |
DOI |
|
|
関連識別子 |
http://dx.doi.org/10.1016/j.lithos.2008.05.004 |
| 収録物識別子 |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0024-4937 |
| 収録物識別子 |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA00717678 |
| 開始ページ |
|
|
開始ページ |
333 |
| 書誌情報 |
Lithos
Lithos
巻 109,
号 3-4,
p. 333-340,
発行日 2009
|
| 旧ID |
27713 |
Lithos_109_333.pdf (15.5 MB)
