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Petrology and chemistry of basal lherzolites above the metamorphic sole from wadi sarami central oman ophiolite
http://hdl.handle.net/2297/36185
http://hdl.handle.net/2297/3618552a27312-eaea-4289-82a2-8d1d6b55cc06
| 名前 / ファイル | ライセンス | アクション |
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SC-PR-ARAI-S-13.pdf (12.4 MB)
Download is available from 9999/12/31.
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||
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| 公開日 | 2017-11-09 | |||||||
| タイトル | ||||||||
| タイトル | Petrology and chemistry of basal lherzolites above the metamorphic sole from wadi sarami central oman ophiolite | |||||||
| 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 | |||||||
| 著者 |
Zaki Khedr, Mohamed
× Zaki Khedr, Mohamed× Arai, Shoji× Python, Marie |
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| 著者別表示 |
荒井, 章司
× 荒井, 章司
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| 書誌情報 |
Journal of Mineralogical and Petrological Sciences 巻 108, 号 1, p. 13-24, 発行日 2013-01-01 |
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| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 1345-6296 | |||||||
| NCID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA11460926 | |||||||
| DOI | ||||||||
| 関連タイプ | isIdenticalTo | |||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | 10.2465/jmps.121026 | |||||||
| 出版者 | ||||||||
| 出版者 | 日本鉱物科学会 JAMS | |||||||
| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | We studied basal lherzolites that are exposed along the metamorphic sole at the base of the central Oman ophiolite (Wadi Sarami). We recognized two types of lherzolites (Types I and II) based on field occurrences, textures, and mineral compositions. Type I lherzolites are massive and transition into harzburgites, whereas Type II lherzolites are strongly foliated with mylonitic to porphyroclastic textures. Type II lherzolites only crop out within a direct contact with the amphibolitic sole to few meters above this sole and are overlain and/or surrounded by Type I. The clinopyroxenes [Mg# = Mg/(Mg + Fe) = 0.89-0.94] of Type II lherzolites show higher contents of Al2O3 (4.5-7.3 wt%), Na2O (0.5-1.2 wt%), Cr2O3 (0.6-1.4 wt%), and TiO2 (0.2-0.4 wt%) than those of Type I lherzolites. Positive correlations among the Al2O3, Na2O, and TiO2 contents of clinopyroxenes show a pronounced residual trend from Type I lherzolites to depleted harzburgite, giving rise to chemical heterogeneities at the base of the mantle section. Clinopyroxenes in lherzolites and harzburgites show compositional trends that are similar to those in abyssal peridotites from normal ridge segments. Olivines (Fo89.4-Fo91.5) show a residual character of the Sarami peridotites. Primary spinels show a wide range of Cr# [= Cr/(Cr + Al) from 0.04 to 0.53] and low YFe [Fe3+/(Cr + Al + Fe3+), <0.046], similar to spinels in abyssal peridotites. The wide range of spinel Cr# is a result of a wide range of partial-melting degrees, which are up to 10% for lherzolites and ~ 10-25% for harzburgites. The Type II lherzolites, which occur near the paleo-fracture zone located to the east of Wadi Sarami, represent a remnant of asthenospheric materials trapped at the base of oceanic lithosphere mantle (Type I) during detachment and obduction. The Type I lherzolites experienced high-degree partial melting, resulting in the formation of harzburgites at the refractory end. The modal and compositional variations of Sarami pyroxenes and spinels indicate intrinsic mantle heterogeneity of Oman ophiolite formed as residues at an oceanic spreading center. | |||||||
| 権利 | ||||||||
| 権利情報 | Copyright © 日本鉱物科学会 JAMS | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 関連URI | ||||||||
| 識別子タイプ | URI | |||||||
| 関連識別子 | https://www.jstage.jst.go.jp/article/jmps/108/1/108_121026/_pdf | |||||||
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| 識別子タイプ | URI | |||||||
| 関連識別子 | http://jams.la.coocan.jp/ | |||||||
