The relationships between volcanism, tectonism, and hydrothermal activity on the Southern Equatorial Mid-Atlantic Ridge

Devey, Colin W.; German, Christopher R.; Haase, Karsten M.; Lackschewitz, Klas; Melchert, Bernd; Connelly, Douglas P.

doi:10.1029/2008gm000756

Cited by 14 publications

(20 citation statements)

References 45 publications

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“…Yet, contrasting O 2 values, i.e. 223 ± 5 µM and 71 ± 2 µM, respectively (Table 1), and diverging crustal permeabilities (Devey et al ., 2010) hint to distinct mixing and circulation scenarios in the subsurfaces, preconditioning different habitats for life.…”

Section: Resultsmentioning

confidence: 99%

“…In the 5°S area, frequent magmatic events coincide with peaks of hydrothermal activity. There, a comparatively high crustal permeability is maintained and appears to enable deep circulation of seawater and high temperatures ofventing (Devey et al ., 2010). The hottest ever measured fluid temperature (464°C) was recorded from vents in the 5°S area (Koschinsky et al ., 2008), but low‐temperature venting, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to 5°S, magma flux in the 9°S Lilliput area is extraordinary high, as indicated by the shallow water depth (1500 m) and thick crust (11 km) (Bruguier et al ., 2003; Haase et al ., 2009). Devey and colleagues (2010) suggested the high magma flux to lead to ductile crust, lacking high permeability and hindering deep‐seawater circulation. Instead, hydrothermal circulation is limited to the uppermost crust and is fuelled by frequent diking events.…”

Section: Introductionmentioning

confidence: 99%

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Driving forces behind the biotope structures in two low-temperature hydrothermal venting sites on the southern Mid-Atlantic Ridge

Perner

Hentscher

Rychlik

et al. 2011

Environmental Microbiology Reports

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Although it has been more than 30 years since the discovery of deep-sea hydrothermal vents, comprehending the interconnections between hydrothermal venting and microbial life remains a challenge. Here we investigate abiotic-biotic linkages in low-temperature hydrothermal biotopes at Desperate and Lilliput on the southern Mid-Atlantic Ridge. Both sites are basalt-hosted and fluids exhibit the expected chemical signatures. However, contrasting crustal permeabilities have been proposed, supporting pervasive mixing at Desperate but restricting circulation at Lilliput. In Desperate fluids, sulfide and O2 were readily available but H2 hardly detectable. Under incubation conditions (oxic unamended, sulfide-spiked, oxic and anoxic H2 -spiked at 18°C), only sulfide oxidation by Thiomicrospira fuelled biomass synthesis. Microbial phylogenies from Desperate incubation experiments resembled those of the natural samples suggesting that the incubation conditions mimicked the environment. In Lilliput fluids, O2 was limited, whereas sulfide and H2 were enriched. Autotrophy appeared to be stimulated by residual sulfide and by amended H2 . Yet, based on bacterial phylogenies only conditions in anoxic H2 -spiked Lilliput incubations appeared similar to parts of the Lilliput habitat. In anoxic H2 -spiked Lilliput enrichments Campylobacteraceae likely supported biomass production through H2 oxidation. We argue that the diverging circulation patterns arising from different subseafloor permeabilities act as major driving forces shaping these biotope structures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Driving forces behind the biotope structures in two low-temperature hydrothermal venting sites on the southern Mid-Atlantic Ridge

Perner

Hentscher

Rychlik

et al. 2011

Environmental Microbiology Reports

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“…Figure shows an along‐axis profile along the Mariana back‐arc spreading center, highlighting the magmatically‐robust versus tectonically‐dominated segment types. The diversity of across‐axis segment morphologies and seafloor depths is similar to the MAR [e.g., Devey et al ., ], associated with along‐axis variations in crustal thickness related to magma supply. For example, the within‐axis high and hourglass‐shaped segment morphology of the Turtle Pits area (3°S, MAR [ Devey et al ., ]) is similar to the Type II segment in the Mariana back‐arc at 17.0°N.…”

Section: Discussionmentioning

confidence: 99%

“…Recent discoveries along the spreading axis of every segment type indicate a primary magmatic control on venting. By comparison with slow‐spreading ridges [e.g., Devey et al ., ; German et al ., ], the greatest potential for large massive sulfide accumulations is in the type II segment at 17.0°N and the type III segment at 14.5°N. As hydrothermal outflow is strongly influenced by crustal permeability, our mapping of the fault patterns provides a means to examine the relationships between large‐scale tectonic processes (and associated volcanism) with hydrothermal venting as discoveries continue to be made.…”

Section: Discussionmentioning

confidence: 99%

Geological interpretation of volcanism and segmentation of the Mariana back‐arc spreading center between 12.7°N and 18.3°N

Anderson

Chadwick

Hannington

et al. 2017

Geochem Geophys Geosyst

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The relationships between tectonic processes, magmatism, and hydrothermal venting along ∼600 km of the slow‐spreading Mariana back‐arc between 12.7°N and 18.3°N reveal a number of similarities and differences compared to slow‐spreading mid‐ocean ridges. Analysis of the volcanic geomorphology and structure highlights the complexity of the back‐arc spreading center. Here, ridge segmentation is controlled by large‐scale basement structures that appear to predate back‐arc rifting. These structures also control the orientation of the chains of cross‐arc volcanoes that characterize this region. Segment‐scale faulting is oriented perpendicular to the spreading direction, allowing precise spreading directions to be determined. Four morphologically distinct segment types are identified: dominantly magmatic segments (Type I); magmatic segments currently undergoing tectonic extension (Type II); dominantly tectonic segments (Type III); and tectonic segments currently undergoing magmatic extension (Type IV). Variations in axial morphology (including eruption styles, neovolcanic eruption volumes, and faulting) reflect magma supply, which is locally enhanced by cross‐arc volcanism associated with N‐S compression along the 16.5°N and 17.0°N segments. In contrast, cross‐arc seismicity is associated with N‐S extension and increased faulting along the 14.5°N segment, with structures that are interpreted to be oceanic core complexes—the first with high‐resolution bathymetry described in an active back‐arc basin. Hydrothermal venting associated with recent magmatism has been discovered along all segment types.

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Lower crustal hydrothermal circulation at slow-spreading ridges: evidence from chlorine in Arctic and South Atlantic basalt glasses and melt inclusions

Zwan

Devey

Hansteen

et al. 2017

Contrib Mineral Petrol

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The relationships between volcanism, tectonism, and hydrothermal activity on the Southern Equatorial Mid-Atlantic Ridge

Cited by 14 publications

References 45 publications

Driving forces behind the biotope structures in two low-temperature hydrothermal venting sites on the southern Mid-Atlantic Ridge

Driving forces behind the biotope structures in two low-temperature hydrothermal venting sites on the southern Mid-Atlantic Ridge

Geological interpretation of volcanism and segmentation of the Mariana back‐arc spreading center between 12.7°N and 18.3°N

Lower crustal hydrothermal circulation at slow-spreading ridges: evidence from chlorine in Arctic and South Atlantic basalt glasses and melt inclusions

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