Ridge-Hotspot Interactions: What Mid-Ocean Ridges Tell Us About Deep Earth Processes

Dyment, J.; Lin, Jian; Baker, Edward T.

doi:10.5670/oceanog.2007.84

Cited by 54 publications

(41 citation statements)

References 22 publications

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“…Previous studies indicated that the frequency of hydrothermal activity on MORs has a strong linear relationship to spreading rate, a proxy for the long-term magma budget, but that this relationship does not appear to hold on hotspot-affected ridge segments (Dyment et al, 2007;, Baker et al, 2008b). The most recent prior compilation of systematic hydrothermal surveys (Baker and German, 2004) presented a linear equation for this relationship, which was revised slightly , based on 12 non-hotspot surveyed portions of MORs totaling 9% of the global ridge strike length.…”

Section: Predicting the Number Of Undiscovered Vent Fields On Spreadimentioning

confidence: 97%

Where are the undiscovered hydrothermal vents on oceanic spreading ridges?

Beaulieu

Baker

German

2015

Deep Sea Research Part II: Topical Studies in Oceanography

150

107

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a b s t r a c tIn nearly four decades since the discovery of deep-sea vents, one-third of the length of global oceanic spreading ridges has been surveyed for hydrothermal activity. Active submarine vent fields are now known along the boundaries of 46 out of 52 recognized tectonic plates. Hydrothermal survey efforts over the most recent decade were sparked by national and commercial interests in the mineral resource potential of seafloor hydrothermal deposits, as well as by academic research. Here we incorporate recent data for back-arc spreading centers and ultraslow-and slow-spreading mid-ocean ridges (MORs) to revise a linear equation relating the frequency of vent fields along oceanic spreading ridges to spreading rate. We apply this equation globally to predict a total number of vent fields on spreading ridges, which suggests that 900 vent fields remain to be discovered. Almost half of these undiscovered vent fields (comparable to the total of all vent fields discovered during 35 years of research) are likely to occur at MORs with full spreading rates less than 60 mm/yr. We then apply the equation regionally to predict where these hydrothermal vents may be discovered with respect to plate boundaries and national jurisdiction, with the majority expected to occur outside of states' exclusive economic zones. We hope that these predictions will prove useful to the community in the future, in helping to shape continuing ridgecrest exploration.

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Section: Predicting the Number Of Undiscovered Vent Fields On Spreadimentioning

confidence: 97%

Where are the undiscovered hydrothermal vents on oceanic spreading ridges?

Beaulieu

Baker

German

2015

Deep Sea Research Part II: Topical Studies in Oceanography

150

107

View full text Add to dashboard Cite

show abstract

“…east-west volcanic lineament formed between 7 and 10 Ma (Dyment et al 2007). The Rodrigues Ridge has been proposed to result from a ridge-hotspot interaction (Morgan 1978) and could represent the surface expression of a channelled asthenospheric flow connecting La Réunion hotspot and the ridge axis, on which one retrieves geochemical signatures from La Réunion hotspot (e.g.…”

Section: Lithospheric Structure Beneath La Réunion Hotspot Track 109mentioning

confidence: 99%

Crustal and uppermost mantle structure variation beneath La Réunion hotspot track

Fontaine¹,

Barruol²,

Tkalčić

et al. 2015

Geophys. J. Int.

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“…1). This relative dense coverage was extended eastward to the Central Indian Ridge, in order to investigate hypothesized asthenospheric flow from hotspot to ridge (Morgan, 1978;Dyment et al, 2007). The seismicity in the reliably active South Sandwich subduction zone generates body-wave paths which sample the mantle beneath La Réunion at greater depths.…”

Section: The Obs Networkmentioning

confidence: 99%

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

et al. 2016

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Abstract. RHUM-RUM is a German-French seismological experiment based on the sea floor surrounding the island of La Réunion, western Indian Ocean (Barruol and Sigloch, 2013). Its primary objective is to clarify the presence or absence of a mantle plume beneath the Reunion volcanic hotspot. RHUM-RUM's central component is a 13-month deployment (October 2012 to November 2013) of 57 broadband ocean bottom seismometers (OBS) and hydrophones over an area of 2000 × 2000 km 2 surrounding the hotspot. The array contained 48 wideband OBS from the German DE-PAS pool and 9 broadband OBS from the French INSU pool. It is the largest deployment of DEPAS and INSU OBS so far, and the first joint experiment.This article reviews network performance and data quality: of the 57 stations, 46 and 53 yielded good seismometer and hydrophone recordings, respectively. The 19 751 total deployment days yielded 18 735 days of hydrophone recordings and 15 941 days of seismometer recordings, which are 94 and 80 % of the theoretically possible yields.The INSU seismic sensors stand away from their OBS frames, whereas the DEPAS sensors are integrated into their frames. At long periods (> 10 s), the DEPAS seismometers are affected by significantly stronger noise than the INSU seismometers. On the horizontal components, this can be explained by tilting of the frame and buoy assemblage, e.g. through the action of ocean-bottom currents, but in addition the DEPAS intruments are affected by significant selfnoise at long periods, including on the vertical channels. By comparison, the INSU instruments are much quieter at periods > 30 s and hence better suited for long-period signals studies.The trade-off of the instrument design is that the integrated DEPAS setup is easier to deploy and recover, especially when large numbers of stations are involved. Additionally, the wideband sensor has only half the power consumption of the broadband INSU seismometers.

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Ridge-Hotspot Interactions: What Mid-Ocean Ridges Tell Us About Deep Earth Processes

Cited by 54 publications

References 22 publications

Where are the undiscovered hydrothermal vents on oceanic spreading ridges?

Where are the undiscovered hydrothermal vents on oceanic spreading ridges?

Crustal and uppermost mantle structure variation beneath La Réunion hotspot track

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

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