scholarly journals Lithospheric Structure and Tectonic Processes Constrained by Microearthquake Activity at the Central Ultraslow-Spreading Southwest Indian Ridge (49.2° to 50.8°E)

2018 ◽  
Author(s):  
Zhiteng Yu ◽  
Jiabiao Li ◽  
Xiongwei Niu ◽  
Nicholas Rawlinson ◽  
Aiguo Ruan ◽  
...  
Keyword(s):  
Southwest Indian Ridge ◽  
Lithospheric Structure ◽  
Tectonic Processes ◽  
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

scholarly journals Microbial ecology of the newly discovered serpentinite-hosted Old City hydrothermal field (southwest Indian ridge)

2020 ◽  
Author(s):  
Aurélien Lecoeuvre ◽  
Bénédicte Ménez ◽  
Mathilde Cannat ◽  
Valérie Chavagnac ◽  
Emmanuelle Gérard
Keyword(s):  
Microbial Ecology ◽  
New Caledonia ◽  
Southwest Indian Ridge ◽  
Hydrothermal Field ◽  
Metagenomic Sequencing ◽  
Lost City ◽  
Old City ◽  
Mid Atlantic Ridge ◽  
Indian Ridge ◽  
Geochemical Analyses

Abstract Lost City (mid-Atlantic ridge) is a unique oceanic hydrothermal field where carbonate-brucite chimneys are colonized by a single phylotype of archaeal Methanosarcinales, as well as sulfur- and methane-metabolizing bacteria. So far, only one submarine analog of Lost City has been characterized, the Prony Bay hydrothermal field (New Caledonia), which nonetheless shows more microbiological similarities with ecosystems associated with continental ophiolites. This study presents the microbial ecology of the ‘Lost City’-type Old City hydrothermal field, recently discovered along the southwest Indian ridge. Five carbonate-brucite chimneys were sampled and subjected to mineralogical and geochemical analyses, microimaging, as well as 16S rRNA-encoding gene and metagenomic sequencing. Dominant taxa and metabolisms vary between chimneys, in conjunction with the predicted redox state, while potential formate- and CO-metabolizing microorganisms as well as sulfur-metabolizing bacteria are always abundant. We hypothesize that the variable environmental conditions resulting from the slow and diffuse hydrothermal fluid discharge that currently characterizes Old City could lead to different microbial populations between chimneys that utilize CO and formate differently as carbon or electron sources. Old City discovery and this first description of its microbial ecology opens up attractive perspectives for understanding environmental factors shaping communities and metabolisms in oceanic serpentinite-hosted ecosystems.

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