Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen - Possible product of peridotite/melt reactions

フォーマット:

論文

責任表示:

Ali, Murad ; Arai, Shoji

言語:

英語

出版情報:

日本鉱物学会, 2007-05-16

著者名:

• Ali, Murad
• Arai, Shoji

掲載情報:

Journal of Mineralogical and Petrological Sciences

ISSN:

1345-6296      

巻:

102

通号:

2

開始ページ:

137

終了ページ:

142

バージョン:

publisher

概要:

金沢大学大学院自然科学研究科自然計測<br />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. 続きを見る

URL:

http://hdl.handle.net/2297/7287