scholarly journals Trace-element compositions of sulfides from inactive Tianzuo hydrothermal field, Southwest Indian Ridge: implications for ultramafic rocks hosting mineralization

2021 ◽  
pp. 104421
Author(s):  
Teng Ding ◽  
Jia Wang ◽  
Chunhui Tao ◽  
Ágata Alveirinho Dias ◽  
Jin Liang ◽  
...  
Keyword(s):  
Trace Element ◽  
Southwest Indian Ridge ◽  
Hydrothermal Field ◽  
Ultramafic Rocks ◽  
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.

Bulk geochemistry, sulfur isotope characteristics of the Yuhuang-1 hydrothermal field on the ultraslow-spreading Southwest Indian Ridge

2018 ◽  
Vol 96 ◽  
pp. 13-27 ◽  
Author(s):  
Shili Liao ◽  
Chunhui Tao ◽  
Huaiming Li ◽  
Fernando J.A.S. Barriga ◽  
Jin Liang ◽  
...  
Keyword(s):  
Sulfur Isotope ◽  
Southwest Indian Ridge ◽  
Hydrothermal Field ◽  
Indian Ridge

scholarly journals 230 Th/ 238 U Dating of Sulfide Chimneys in the Longqi‐1 Hydrothermal Field, Southwest Indian Ridge

2019 ◽  
Vol 93 (S2) ◽  
pp. 77-78 ◽  
Author(s):  
Jin LIANG ◽  
Chunhui TAO ◽  
Weifang YANG ◽  
Shili LIAO ◽  
Wei HUANG
Keyword(s):  
Southwest Indian Ridge ◽  
Hydrothermal Field ◽  
Indian Ridge

The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge

2018 ◽  
Vol 37 (3) ◽  
pp. 73-79 ◽  
Author(s):  
Chaofeng Sun ◽  
Zhaocai Wu ◽  
Chunhui Tao ◽  
Aiguo Ruan ◽  
Guoyin Zhang ◽  
...  
Keyword(s):  
Deep Structure ◽  
Southwest Indian Ridge ◽  
Hydrothermal Field ◽  
Indian Ridge

Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48 to 53°E, Southwest Indian Ridge

2020 ◽  
Author(s):  
Jixin Wang ◽  
Huaiyang Zhou ◽  
Vincent J M Salters ◽  
Henry J B Dick ◽  
Jared J Standish ◽  
...  
Keyword(s):  
Trace Element ◽  
Southwest Indian Ridge ◽  
Isotopic Compositions ◽  
Depleted Mantle ◽  
Bone Segment ◽  
Mid Ocean Ridge ◽  
Mantle Component ◽  
Indian Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

Abstract Mantle source heterogeneity and magmatic processes have been widely studied beneath most parts of the Southwest Indian Ridge (SWIR). But less is known from the newly recovered mid-ocean ridge basalts from the Dragon Bone Amagmatic Segment (53°E, SWIR) and the adjacent magmatically robust Dragon Flag Segment. Fresh basalt glasses from the Dragon Bone Segment are clearly more enriched in isotopic composition than the adjacent Dragon Flag basalts, but the trace element ratios of the Dragon Flag basalts are more extreme compared with average mid-ocean ridge basalts (MORB) than the Dragon Bone basalts. Their geochemical differences can be explained only by source differences rather than by variations in degree of melting of a roughly similar source. The Dragon Flag basalts are influenced by an arc-like mantle component as evidenced by enrichment in fluid-mobile over fluid-immobile elements. However, the sub-ridge mantle at the Dragon Flag Segment is depleted in melt component compared with a normal MORB source owing to previous melting in the subarc. This fluid-metasomatized, subarc depleted mantle is entrained beneath the Dragon Flag Segment. In comparison, for the Dragon Bone axial basalts, their Pb isotopic compositions and their slight enrichment in Ba, Nb, Ta, K, La, Sr and Zr and depletion in Pb and Ti concentrations show resemblance to the Ejeda–Bekily dikes of Madagascar. Also, Dragon Bone Sr and Nd isotopic compositions together with the Ce/Pb, La/Nb and La/Th ratios can be modeled by mixing the most isotopically depleted Dragon Flag basalts with a composition within the range of the Ejeda–Bekily dikes. It is therefore proposed that the Dragon Bone axial basalts, similar to the Ejeda–Bekily dikes, are sourced from subcontinental lithospheric Archean mantle beneath Gondwana, pulled from beneath the Madagascar Plateau. The recycling of the residual subarc mantle and the subcontinental lithospheric mantle could be related to either the breakup of Gondwana or the formation and accretion of Neoproterozoic island arc terranes during the collapse of the Mozambique Ocean, and is now present beneath the ridge.

Sign in / Sign up

Export Citation Format

Share Document