Dynamical Instability Produces Transform Faults at Mid-Ocean Ridges

@article{Gerya2010DynamicalIP,
  title={Dynamical Instability Produces Transform Faults at Mid-Ocean Ridges},
  author={Taras V. Gerya},
  journal={Science},
  year={2010},
  volume={329},
  pages={1047 - 1050}
}
  • T. Gerya
  • Published 27 August 2010
  • Geology
  • Science
Cracking Up Transform faults perpendicular to mid-ocean ridges are some of the most prominently visual features on the sea floor. Because they form slowly over thousands of years, the lack of observational data means their mechanism of formation has remained controversial. Taking a numerical modeling approach, Gerya (p. 1047) suggests that due to asymmetric growth of the plate boundary, sections of the mid-ocean ridge become unstable and eventually rotate 90°. As the ridge continues to grow… 
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References

SHOWING 1-10 OF 54 REFERENCES
Modes of faulting at mid-ocean ridges
TLDR
Numerical models of plate separation, dyke intrusion and faulting require at least two distinct mechanisms of fault formation at ridges to explain a large range of fault sizes and orientations.
Spreading rate dependence of gravity anomalies along oceanic transform faults
TLDR
A systematic study of the residual mantle Bouguer gravity anomaly of 19 oceanic transform faults reveals a strong correlation between gravity signature and spreading rate, which suggests that three-dimensional magma accretion may occur near intermediate- and fast-slipping transform faults.
Evidence for weak oceanic transform faults
We present the results of a series of 3‐D boundary element calculations to investigate the effects of oceanic transform faults on stress state and fault development at adjacent mid‐ocean ridge
Central role of detachment faults in accretion of slow-spreading oceanic lithosphere
TLDR
An examination of ∼2,500 km of the Mid-Atlantic Ridge between 12.5 and 35° N is presented, which reveals asymmetrical accretion along almost half of the ridge, suggesting that much of the variability in sea-floor morphology, seismicity and basalt chemistry found along slow-spreading ridges can be thus attributed to the frequent involvement of detachment faults in oceanic lithospheric accretion.
Thermal stress and the spacings of transform faults
Bathymetric charts are used with satellite altimeter profiles to locate major ridge-transform intersections along five spreading ridges. The ridges are the Mid-Atlantic Ridge, the East Pacific Rise,
Extremely asymmetric magmatic accretion of oceanic crust at the ends of slow-spreading ridge segments
We report the results of a deep-towed magnetic survey of part of a Mid-Atlantic Ridge spreading segment. Analysis of the magnetic reversals indicates that for the past 0.7 m.y., magmatic accretion at
An ultraslow-spreading class of ocean ridge
TLDR
An ultraslow-spreading class of ocean ridge that is characterized by intermittent volcanism and a lack of transform faults is revealed, and it is found that the mantle beneath such ridges is emplaced continuously to the seafloor over large regions.
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