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DOI | 10.1007/s00410-011-0669-5 |
Origin of wehrlite cumulates in the Moho transition zone of the Neoproterozoic Ras Salatit ophiolite, Central Eastern Desert, Egypt: crustal wehrlites with typical mantle characteristics | |
Gahlan, Hisham A.1; Arai, Shoji2; Abu El-Ela, Fawzy F.1; Tamura, Akihiro2 | |
通讯作者 | Gahlan, Hisham A. |
来源期刊 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
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ISSN | 0010-7999 |
出版年 | 2012 |
卷号 | 163期号:2页码:225-241 |
英文摘要 | Ultramafic cumulates, mainly crustal true wehrlites, were discovered and described in the mantle-crust transition zone (MTZ) and the extremely lower layered gabbro sequence of the Ras Salatit ophiolite, Central Eastern Desert, Egypt. They form either boudinaged lensoidal tabular bodies or interdigitated layers often concordant with the planolinear fabrics of the Ras Salatit ophiolite rocks. The contact between wehrlites and the host MTZ dunite or layered gabbro is razor sharp, lobate and/or sinuous, without chilled margins or any visible deformations. The Ras Salatit wehrlites are orthopyroxene-free and composed mainly of olivine and clinopyroxene. They are texturally equilibrated and show a characteristic poikilitic texture. Crystallization order of the Ras Salatit wehrlites is olivine/spinel followed by clinopyroxene with the absence of plagioclase. Olivine and clinopyroxene of the Ras Salatit wehrlites are compositionally uniform and conspicuously high in Mg#, mostly around 0.93 and 0.92, respectively. Moreover, the clinopyroxene shows low Ti and Al contents coupled with marked depletion in LILE. The calculated melt in equilibrium with clinopyroxene from the Ras Salatit wehrlites is largely similar to lavas from the Izu-Bonin forearc. Given the above characteristics, the Ras Salatit wehrlites were produced by crystal accumulation from a hydrous depleted basaltic/tholeiitic melt corresponding to temperatures between 1,000 and 1,100A degrees C at the oceanic crustal pressure (similar to 2 kbar). The involved hydrous tholeiitic melt has been probably formed by fluid-assisted partial melting of a refractory mantle source (similar to the underlying harzburgites) in a somewhat shallow sub-arc environment. |
英文关键词 | Wehrlite Cumulates Ras Salatit ophiolite Moho transition zone (MTZ) Sub-arc setting |
类型 | Article |
语种 | 英语 |
国家 | Egypt ; Japan |
收录类别 | SCI-E |
WOS记录号 | WOS:000299513200003 |
WOS关键词 | LATE PROTEROZOIC OPHIOLITE ; NORTHERN OMAN OPHIOLITE ; BOU-AZZER OPHIOLITE ; ARM MOUNTAIN MASSIF ; MELT-ROCK REACTION ; ISLANDS OPHIOLITE ; MINERAL CHEMISTRY ; CHROMIAN SPINEL ; SPREADING RIDGE ; PODIFORM CHROMITITE |
WOS类目 | Geochemistry & Geophysics ; Mineralogy |
WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/171894 |
作者单位 | 1.Assiut Univ, Dept Geol, Fac Sci, Assiut 71516, Egypt; 2.Kanazawa Univ, Dept Earth Sci, Kanazawa, Ishikawa 9201192, Japan |
推荐引用方式 GB/T 7714 | Gahlan, Hisham A.,Arai, Shoji,Abu El-Ela, Fawzy F.,et al. Origin of wehrlite cumulates in the Moho transition zone of the Neoproterozoic Ras Salatit ophiolite, Central Eastern Desert, Egypt: crustal wehrlites with typical mantle characteristics[J],2012,163(2):225-241. |
APA | Gahlan, Hisham A.,Arai, Shoji,Abu El-Ela, Fawzy F.,&Tamura, Akihiro.(2012).Origin of wehrlite cumulates in the Moho transition zone of the Neoproterozoic Ras Salatit ophiolite, Central Eastern Desert, Egypt: crustal wehrlites with typical mantle characteristics.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,163(2),225-241. |
MLA | Gahlan, Hisham A.,et al."Origin of wehrlite cumulates in the Moho transition zone of the Neoproterozoic Ras Salatit ophiolite, Central Eastern Desert, Egypt: crustal wehrlites with typical mantle characteristics".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 163.2(2012):225-241. |
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