scholarly journals Anisotropic structures of oceanic slab and mantle wedge in a deep low-frequency tremor zone beneath the Kii Peninsula, SW Japan

2013 ◽  
Vol 118 (3) ◽  
pp. 1091-1097 ◽  
Author(s):  
Atsushi Saiga ◽  
Aitaro Kato ◽  
Eiji Kurashimo ◽  
Takashi Iidaka ◽  
Makoto Okubo ◽  
...  
Keyword(s):  
Mantle Wedge ◽  
Low Frequency ◽  
Kii Peninsula ◽  
Anisotropic Structures ◽  
Oceanic Slab ◽  
Sw Japan

Very broadband analysis of a swarm of very low frequency earthquakes and tremors beneath Kii Peninsula, SW Japan

2010 ◽  
Vol 37 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Akiko Takeo ◽  
Koki Idehara ◽  
Ryohei Iritani ◽  
Takashi Tonegawa ◽  
Yutaka Nagaoka ◽  
...  
Keyword(s):  
Low Frequency ◽  
Kii Peninsula ◽  
Very Low Frequency ◽  
Sw Japan

scholarly journals Orthopyroxene-rich Rocks from the Sanbagawa Belt (SW Japan): Fluid–Rock Interaction in the Forearc Slab–Mantle Wedge Interface

2015 ◽  
Vol 56 (6) ◽  
pp. 1113-1137 ◽  
Author(s):  
Shunsuke Endo ◽  
Tomoyuki Mizukami ◽  
Simon R. Wallis ◽  
Akihiro Tamura ◽  
Shoji Arai
Keyword(s):  
Mantle Wedge ◽  
Rock Interaction ◽  
Sw Japan

scholarly journals Finding Paleogene beds in the uppermost Izumi Group in western Kii Peninsula, SW Japan

2020 ◽  
Vol 126 (11) ◽  
pp. 639-644
Author(s):  
Yukio Isozaki ◽  
Ryo Hasegawa ◽  
Harue Masuda ◽  
Yukiyasu Tsutsumi
Keyword(s):  
Kii Peninsula ◽  
Sw Japan

Chert–clastic sequence in the Cretaceous Shimanto Accretionary Complex on the central Kii Peninsula, SW Japan

Island Arc ◽  
2020 ◽  
Vol 29 (1) ◽  
Author(s):  
Yusuke Shimura ◽  
Makoto Takeuchi ◽  
Tetsuya Tokiwa
Keyword(s):  
Accretionary Complex ◽  
Kii Peninsula ◽  
Sw Japan

scholarly journals Geochemistry of the Neoarchaean Volcanic Rocks of the Kilimafedha Greenstone Belt, Northeastern Tanzania

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Charles W. Messo ◽  
Shukrani Manya ◽  
Makenya A. H. Maboko
Keyword(s):  
Partial Melting ◽  
Greenstone Belt ◽  
Mantle Wedge ◽  
Spatial Association ◽  
Volcanic Rocks ◽  
Low Concentrations ◽  
Peridotite Mantle ◽  
Ree Patterns ◽  
Subducting Slab ◽  
Oceanic Slab

The Neoarchaean volcanic rocks of the Kilimafedha greenstone belt consist of three petrological types that are closely associated in space and time: the predominant intermediate volcanic rocks with intermediate calc-alkaline to tholeiitic affinities, the volumetrically minor tholeiitic basalts, and rhyolites. The tholeiitic basalts are characterized by slightly depleted LREE to nearly flat REE patterns with no Eu anomalies but have negative anomalies of Nb. The intermediate volcanic rocks exhibit very coherent, fractionated REE patterns, slightly negative to absent Eu anomalies, depletion in Nb, Ta, and Ti in multielement spidergrams, and enrichment of HFSE relative to MORB. Compared to the other two suites, the rhyolites are characterized by low concentrations of TiO2 and overall low abundances of total REE, as well as large negative Ti, Sr, and Eu anomalies. The three suites have a εNd (2.7 Ga) values in the range of −0.51 to +5.17. The geochemical features of the tholeiitic basalts are interpreted in terms of derivation from higher degrees of partial melting of a peridotite mantle wedge that has been variably metasomatized by aqueous fluids derived from dehydration of the subducting slab. The rocks showing intermediate affinities are interpreted to have been formed as differentiates of a primary magma formed later by lower degrees of partial melting of a garnet free mantle wedge that was strongly metasomatized by both fluid and melt derived from the subducting oceanic slab. The rhyolites are best interpreted as having been formed by shallow level fractional crystallization of the intermediate volcanic rocks involving plagioclase and Ti-rich phases like ilmenite and magnetite as well as REE-rich phases like apatite, zircon, monazite, and allanite. The close spatial association of the three petrological types in the Kilimafedha greenstone belt is interpreted as reflecting their formation in an evolving late Archaean island arc.

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