scholarly journals Birth of a large volcanic edifice through lithosphere-scale dyking offshore Mayotte (Indian Ocean)

2021 ◽  
Author(s):  
Nathalie Feuillet ◽  
Stephan Jorry ◽  
Wayne Crawford ◽  
Christine Deplus ◽  
Isabelle Thinon ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Volcanic Edifice

scholarly journals Turbidity current activity along the flanks of a volcanic edifice: The Mafate volcaniclastic complex, La Réunion Island, Indian Ocean

2016 ◽  
Vol 335 ◽  
pp. 34-50 ◽  
Author(s):  
Aude Mazuel ◽  
Emmanuelle Sisavath ◽  
Nathalie Babonneau ◽  
Stephan J. Jorry ◽  
Patrick Bachèlery ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Turbidity Current ◽  
Volcanic Edifice ◽  
Reunion Island ◽  
La Réunion ◽  
Current Activity ◽  
Réunion Island ◽  
La Réunion Island

scholarly journals Birth of a large volcanic edifice offshore Mayotte (Comoros Island, Western Indian Ocean)

2020 ◽  
Author(s):  
Nathalie Feuillet ◽  
Stephan Jorry ◽  
Wayne Crawford ◽  
Christine Deplus ◽  
Isabelle Thinon ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Noble Gas ◽  
Low Frequency ◽  
Volcanic Eruptions ◽  
Western Indian Ocean ◽  
Volcanic Edifice ◽  
East African ◽  
Chemical Signatures ◽  
Acoustic Anomaly ◽  
Magmatic Event

<p>Volcanic eruptions are foundational events shaping the Earth’s surface and providing a window into deep Earth processes. We document here an ongoing magmatic event offshore Mayotte island (Western Indian Ocean) unprecedented in terms of emitted volume of lava and duration of the seismic crisis.This event gave birth to a deep-sea volcanic edifice 820m tall and ~ 5 km<sup>3</sup> in volume, located 50 km from Mayotte. A plume with distinct chemical signatures compared to open-ocean seawater emanated from the edifice, generating an exceptional 1900m-high vertical acoustic anomaly in the water column. Noble gas analyses in the vesicles from a popping rock dredged on the flank of the edifice, indicate rapid magma transfer from the asthenosphere. The edifice is located at the tip of a WNW-ESE–striking volcanic ridge composed of many other edifices, cones and lava flows constructed by past eruptions. Starting in May 2018 thousand of earthquakes were triggered by the magmatic event. The space-time distribution of the seismicity suggests that magma below the center of the ridge was transported to the new edifice over a few weeks in dikes that penetrated the brittle mantle a result of a lithosphere-scale extensional episode accommodating motion along a transfer zone between the East-African rifts and Madagascar. Since the eruption’s onset, the seismicity is mostly concentrated closer to the island, in an exceptionally deep zone (25-50 km) overlain by a zone of enigmatic, very low frequency, tremors.</p>

Isotopic niches of the blue shark Prionace glauca and the silky shark Carcharhinus falciformis in the southwestern Indian Ocean

2012 ◽  
Vol 17 (1) ◽  
pp. 83-92 ◽  
Author(s):  
N Rabehagasoa ◽  
A Lorrain ◽  
P Bach ◽  
M Potier ◽  
S Jaquemet ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Silky Shark ◽  
Carcharhinus Falciformis ◽  
Southwestern Indian Ocean
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