METASOMATIC VEINS AND MINERALS IN MANTLE-DERIVED XENOLITHS, ANTARCTICA

スポンサーリンク

概要

• 論文の詳細を見る

• Late Cenozoic basanites of the McMurdo Volcanic Group, Antarctica, contain numerous ultramafic xenoliths derived from the upper mantle. The xenoliths show multiple-episodes of metasomatism resulting in formation of the veined metasomites and the equilibrated metasomites. The metasomatized xenoliths are characterized texturally and chemically by co-existence of Ti-augite, phlogopitic mica, pargasitic and kaersutitic amphiboles, Al-spinel and apatite with the upper mantle olivine, pyroxenes, and Cr-spinel. Ti-, Al-, Fe- and Ca- enrichments and Si-, Cr- and Mg-depletions observed in the metasomatic clinopyroxenes indicate that the metasomatism was probably generated by an alkaline silicate melt reacting with solid phases of the upper mantle. Ti- and Fe-enrichments and Al-depletion in the metasomatic clinopyroxenes can be also detected as a separate episode of metasomatism different from the above veined-type reactions. Texturally and chemically equilibrated phlogopites and pargasites in the mantle-derived xenoliths provide a different type metasomatism, showing conspicuous depletions in TiO_2,Al_2O_3,Cr_2O_3,and K_2O, and enrichments in SiO_2 and Na_2O.

• 国立極地研究所の論文

著者

• Niida Kiyoaki

  Department Of Earth And Planetary Sciences Graduate School Of Science Hokkaido University

• Niida Kiyoaki

  Department Of Geology And Mineralogy Faculty Of Science Hokkaido University

関連論文

• Sr and Nd isotopic data for the seven GSJ rock reference samples : JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1, and JR-1
• Glass in mantle-derived peridotite xenoliths from the McMurdo Volcanic Group, Antarctica
• CUMULATE INCLUSIONS FROM TURTLE ROCK, ROSS ISLAND, ANTARCTICA
• PERIDOTITES FROM THE SEAMOUNT OFF WILKES LAND, ANTARCTICA
• METASOMATIC VEINS AND MINERALS IN MANTLE-DERIVED XENOLITHS, ANTARCTICA
• GLASS IN MANTLE-DERIVED PERIDOTITE XENOLITHS FROM THE McMURDO VOLCANIC GROUP, ANTARCTICA

スポンサーリンク