Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen - Possible product of peridotite/melt reactions
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概要
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Ultramafic xenoliths in Pliocene-Quaternary basalts from Bir Ali, the Shabwa Governorate, southern Yemen, were studied to examine upper mantle processes related to continental rifting. They show a great variety of rock types: spinel lherzolites, harzburgites, dunites, clinopyroxene (= cpx)-rich lherzolites, wehrlites and pyroxenites. The cpx-rich lherzolites and wehrlites with high clinopyroxene/orthopyroxene ratios (> 1), which are characteristic of the Bir Ali xenolith suite, contain lower Fo contents of olivine than ordinary lherzolites at a given Cr# of spinel. Their clinopyroxenes are higher in TiO2 and REE contents than those in the ordinary therzolites, which are restite. These features strongly indicate metasomatic addition of clinopyroxene from alkali basalts at the expense of orthopyroxene to depleted peridotites for genesis of the cpx-rich lherzolites. The cpx-rich lherzolites are one of common constituents of lithospheric mantle at rifted continental margins.
- 日本鉱物学会の論文
- 2007-04-01
著者
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Arai Shoji
Kanazawa Univ. Kanazawa Jpn
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Arai Shoji
Department Of Earth Sciences Faculty Of Science Kanazawa University
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ALI Murad
Department of Earth Sciences, Kanazawa University
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Ali Murad
Department Of Earth Sciences Kanazawa University
関連論文
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- The solution introduction ICP-MS technique to trace element analysis of rocks
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- Occurrence and its tectonic significance of chromian spinels from the Kanmon Group, SW Japan
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- Preface
- Geochemistry of clinopyroxene in peridotites from the Nukabira complex, Kamuikotan zone, Hokkaido, Japan : a LA-ICP-MS study
- Petrological feature of spinel lherzolite xenolith from Oki-Dogo Island: An implication for variety of the upper mantle peridotite beneath southwestern Japan
- Corona structure from arc mafic-ultramafic cumulates : The role and chemical characteristics of late-magmatic hydrous liquids
- Occurrence of detrital chromian spinels and its implication : tectonic setting of Matsugadaira-Motai belt, NE Japan
- Occurrence of detrital chromian spinels from the end-Permian sedimentary complex, shikoku, and its implications for the tectonic setting of the Kurosegawa lamdmass
- Detrital chromian spinels from the Tobigamori and karaumedate Formations in the Mt. Tobigamori area, South Kitakami Mountains, NE Japan
- Inhomogeneous spinel in chromitite from the Iwanai-dake peridotite complex, Hokkaido, Japan : variations of spinel unmixing texture and chemical composition
- Ca-metasomatism in the oceanic mantle as the result of high-T hydrothermal circulation : evidence from diopsidite dykes in the Oman ophiolite
- Concordant and discordant podiform chromitites in the Zambales Ophiolite Complex, Philippines
- Abyssal harzburgite veined by silica-oversaturated melt in the Sibuyan Ultramafics, Romblon, Central Philippines
- Crustal diopsidites from the northern Oman ophiolite : Evidence for hydrothermal circulation through suboceanic Moho
- Petrology and geochemistry of chromian spinel-bearing serpentinites in the Hida Marginal Belt (Ise area, Japan) : characteristics of their protoliths
- Origin of spinel-free dunite veins from northern Oman ophiolite : Possible involvement of a komatiitic melt
- Low-temperature Sr enrichment in mantle pyroxenes as a result of crustal alteration in plagioclase lherzolite
- Raman spectroscopy of hydrous inclusions in olivine and orthopyroxene in ophiolitic harzburgite : Implications for elementary processes in serpentinization
- Zincian chromite inclusions in diamonds : Possibility of deep recycling origin
- Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen - Possible product of peridotite/melt reactions
- Role of dunite in genesis of primitive MORB
- Thermal structure beneath Far Eastern Russia inferred from geothermobarometric analyses of mantle xenoliths: Direct evidence for high geothermal gradient in backarc lithosphere
- Spatial distribution and origin of mantle heterogeneity in the Oman ophiolite : evidence from basal peridotites
- Structural change of alkali feldspar by ball milling
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