scholarly journals Evidence for major-element heterogeneity in the mantle source of abyssal peridotites from the Southwest Indian Ridge (52° to 68°E)

2003 ◽  
Vol 4 (2) ◽  
Author(s):  
Monique Seyler ◽  
Mathilde Cannat ◽  
Catherine Mével
Keyword(s):  
Mantle Source ◽  
Major Element ◽  
Southwest Indian Ridge ◽  
Indian Ridge

scholarly journals Melt Inclusions in Plagioclase Macrocrysts at Mount Jourdanne, Southwest Indian Ridge (~64° E): Implications for an Enriched Mantle Source and Shallow Magmatic Processes

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 493 ◽  
Author(s):  
Wei Li ◽  
Chunhui Tao ◽  
Wen Zhang ◽  
Jia Liu ◽  
Jin Liang ◽  
...  
Keyword(s):  
Mantle Source ◽  
Melt Inclusions ◽  
Parental Magma ◽  
Southwest Indian Ridge ◽  
Host Magma ◽  
Enriched Mantle ◽  
Magma Supply ◽  
General Chemical ◽  
Indian Ridge ◽  
Ocean Ridge

Plagioclase ultraphyric basalts (PUBs) with up to 40% millimeter-sized plagioclase crystals, were sampled from the Mount Jourdanne volcanic massif (~64° E) in the Southwest Indian Ridge. The geochemistry of the host glass, the glassy melt inclusions and their host plagioclase macrocrysts (An60-69) are used to reveal the mantle heterogeneity and to discuss the origin of Mount Jourdanne PUBs. The melt inclusions trapped in plagioclase display low MgO and high SiO2 contents and show rare earth element (REE) patterns resembling enriched mid-ocean ridge basalts (E-MORB). Together with their positive Sr and Eu anomalies, these features indicate that they were derived from an enriched mantle source, likely a refertilized peridotite or a pyroxenite. In contrast to some 61–67° E basalts, there is a lack of negative Eu anomalies in the PUB host glasses, precluding large amounts of plagioclase crystallization from their parental magma. Petrographic observations and the general chemical similarity between melt inclusions and melts equilibrated with the clinopyroxene cores in regional gabbros and/or troctolites suggest that these plagioclase macrocrysts originate from gabbroic mush within the lower crust. The density contrasts allow the effective segregation of plagioclase prior to their incorporation into the host magma. We propose that these plagioclase macrocrysts were entrained when a new batch of magma passed through the crustal mush zone, and resulted in the formation of the PUB. Eruption of Mount Jourdanne PUBs requires a minimum ascending velocity of 5 m d−1 for the host magma, which is not as high as the eruption rate for typical MORB samples. It is likely that the PUB host magma erupts during a period with reduced magma supply, whereas eruption of aphyric lavas correspond to the fast volcanic formation of the Mount Jourdanne massif.

scholarly journals Melt extraction and mantle source at a Southwest Indian Ridge Dragon Bone amagmatic segment on the Marion Rise

Lithos ◽  
2016 ◽  
Vol 246-247 ◽  
pp. 48-60 ◽  
Author(s):  
Changgui Gao ◽  
Henry J.B. Dick ◽  
Yang Liu ◽  
Huaiyang Zhou
Keyword(s):  
Mantle Source ◽  
Southwest Indian Ridge ◽  
Melt Extraction ◽  
Indian Ridge

scholarly journals MORB generation beneath the ultraslow spreading Southwest Indian Ridge (9-25°E): Major element chemistry and the importance of process versus source

2008 ◽  
Vol 9 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jared J. Standish ◽  
Henry J. B. Dick ◽  
Peter J. Michael ◽  
William G. Melson ◽  
Timothy O'Hearn
Keyword(s):  
Major Element ◽  
Southwest Indian Ridge ◽  
Major Element Chemistry ◽  
Element Chemistry ◽  
Indian Ridge

scholarly journals A new peltospirid snail (Gastropoda: Neomphalida) adds to the unique biodiversity of Longqi vent field, Southwest Indian Ridge

2021 ◽  
Vol 55 (13-14) ◽  
pp. 851-866
Author(s):  
Chong Chen ◽  
Yuru Han ◽  
Jonathan T. Copley ◽  
Yadong Zhou
Keyword(s):  
Southwest Indian Ridge ◽  
Indian Ridge
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