PERIDOTITES FROM THE SEAMOUNT OFF WILKES LAND, ANTARCTICA

スポンサーリンク

概要

• 論文の詳細を見る

• Dredged peridotite-pyroxenite samples from Antarctic Seamount B were examined to clarify the petrological signature. It is suggested from the tectonic setting that the emplacement of the peridotites was achieved by uplifting of upper mantle materials generated as a pre-oceanic rifting at the early stage of continental breakup between Antarctica and Australia. The Seamount B lherzolites contain a large volume of clinopyroxenes (6.5-12.9 modal%) and spinels (2.0-2.9 modal%). The Fo content in olivines ranges between 89.5 and 92.3. The spinels are highly aluminous (Cr#=7.8-15.7). Notably, the clinopyroxenes contain high Na_2O (1.24-2.35 wt%) and TiO_2 (0.27 to 0.85 wt%). The modal composition and mineral chemistry suggest that the Seamount B lherzolites display a 'fertile' subcontinental mantle signature ranging from the least to moderately depleted peridotite.

• 国立極地研究所の論文

著者

• YUASA Makoto

  Geological Survey of Japan

• NIIDA Kiyoaki

  Department of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University

• Niida Kiyoaki

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

関連論文

• SEDIMENTOLOGICAL STUDY OF THE SEA BOTTOM SEDIMENTS IN AND AROUND THE ROSS SEA CONTINENTAL SHELF, ANTARCTICA
• K-Ar ages from seamount chains in the back-arc region of the Izu-Ogasawara arc
• PRELIMINARY REPORT OF THE TH95 GEOLOGICAL AND GEOPHYSICAL SURVEY RESULTS IN THE ROSS SEA AND DUMONT D'URVILLE SEA
• 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
• Possible Miocene rifting of the Izu-Ogasawara (Bonin) arc deduced from magnetic anomalies
• 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