Seismic activity recorded by a single OBS/H near the active Longqi hydrothermal vent at the ultraslow spreading Southwest Indian Ridge (49°39′ E)

Liu, Yunlong; Tao, Chunhui; Liu, Cai; Qiu, Lei; Schlindwein, Vera; Zhang, Haijiang; Tian, You; Wang, Hanchuang

doi:10.1080/1064119x.2017.1420114

Cited by 4 publications

(5 citation statements)

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“…For this reconstruction we assume that OCC formation initiates at the rift valley wall, typically located 3-6 km distant from the AVR accretionary axis (Fig. 6) and that OCC2 is still actively slipping as indicated by the seismic activity 24 .…”

Section: Resultsmentioning

confidence: 99%

“…Fig.7Intermittent detachment faulting and episodic magmatic accretion. Present-day cross-section of profile L2 showing detachment fault geometry (red dashed lines) as determined by seismic data24 and the surface expression of the faults (red solid lines) along with the inferred crustal units. The location of vent sites have been projected onto the cross-section and the LQ-3 vent site sits on the stranded block on the DF2 fault surface.…”

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confidence: 99%

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An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys

Tivey

Tao

et al. 2021

Nat Commun

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Magmatic and tectonic processes can contribute to discontinuous crustal accretion and play an important role in hydrothermal circulation at ultraslow-spreading ridges, however, it is difficult to accurately describe the processes without an age framework to constrain crustal evolution. Here we report on a multi-scale magnetic survey that provides constraints on the fine-scale evolution of a detachment faulting system that hosts hydrothermal activity at 49.7°E on the Southwest Indian Ridge. Reconstruction of the multi-stage detachment faulting history shows a previous episode of detachment faulting took place 0.76~1.48 My BP, while the present fault has been active for the past ~0.33 My and is just in the prime of life. This fault sustains hydrothermal circulation that has the potential for developing a large sulfide deposit. High resolution multiscale magnetics allows us to constrain the relative balance between periods of detachment faulting and magmatism to better describe accretionary processes on an ultraslow spreading ridge.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys

Tivey

Tao

et al. 2021

Nat Commun

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“…Starting with Pro le L2, which has the best de nition of both OCC1 and OCC2, we begin at the present day and restore the section sequentially through time. If we assume the present-day fault at OCC2 is active and continuing to slip as indicated by the seismic activity 23 , then we can restore the fault slip using the estimated half spreading rate of 7.97 km/My calculated earlier from the L2 pro le (Fig. 2).…”

Section: Discussionmentioning

confidence: 99%

An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys

Tivey

Tao

et al. 2020

Preprint

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Magmatic and tectonic processes can contribute to discontinuous crustal accretion and play an important role in hydrothermal circulation at ultraslow-spreading ridges, however, it is difficult to accurately describe the processes without an age framework to constrain crustal evolution. Here we report on a multi-scale magnetic survey that provides constraints on the fine-scale evolution of a detachment faulting system that hosts hydrothermal activity at 49.7°E on the Southwest Indian Ridge. Reconstruction of the multi-stage detachment faulting history shows a previous episode of detachment faulting took place 0.76~1.48 My BP, while the present fault has been active for the past ~0.33 My just in the prime of life. This fault sustains hydrothermal circulation that has the potential for developing a large sulfide deposit. High resolution multiscale magnetics allows us to constrain the relative balance between periods of detachment faulting and magmatism to better describe accretionary processes on an ultraslow spreading ridge.

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“…Therefore, we are missing a solid evidence for active hydrothermal activity in this area. However, station KNR21 showed an abundance of short-duration events (SDE) also recorded by OBS placed near other hydrothermal systems (Liu et al, 2019;Sohn et al, 1995). Another explanation for a lowered Vp/Vs-ratio would be increased crack density, which also reduces the P-velocity stronger than the S-velocity, as seen in the P-and S-velocity structures close to the surface between kilometers 20 and 27 along the profile (Figure 6).…”

Section: Shallow Crustal Structure Of the Logachev Volcanic Centermentioning

confidence: 96%

Magmatic Activity and Dynamics of Melt Supply of Volcanic Centers of Ultraslow Spreading Ridges: Hints From Local Earthquake Tomography at the Knipovich Ridge

Meier

Schlindwein

Schmid

2022

Geochem Geophys Geosyst

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Ultraslow spreading ridges with spreading rates below 20 mm/yr exhibit different characteristics and behavior than any faster spreading ridges (Dick et al., 2003). At ultraslow pace, melt supply is not high enough to sustain a spatially continuous shallow melt reservoir underneath the rift valley and therefore volcanic activity and magmatism do not occur along the entire rift axis. Instead, they are bound to distinct regions along the ridge that receive more melt than the ridge on average does (Cannat et al., 2003;Standish et al., 2008). Those magmatic segments build volcanic centers that are widely spaced, often by several tens of kilometers (Cannat et al., 2003;Curewitz et al., 2010;Standish et al., 2008). Volcanic centers receive enough melt to build volcanic edifices in the rift valley. If the melt supply persists over time, seamount chains or a line of elevations form in spreading direction (Jokat et al., 2003;Mendel et al., 2003) (e.g., Figure 1b). The regions in between volcanic centers are dominated

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Seismic activity recorded by a single OBS/H near the active Longqi hydrothermal vent at the ultraslow spreading Southwest Indian Ridge (49°39′ E)

Cited by 4 publications

References 50 publications

An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys

An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys

An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys

Magmatic Activity and Dynamics of Melt Supply of Volcanic Centers of Ultraslow Spreading Ridges: Hints From Local Earthquake Tomography at the Knipovich Ridge

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