Structural control on sea-floor hydrothermal activity at the TAG active mound

Article Abstract:

The flow of hydrothermal fluids to the Trans-Atlantic Geographers (TAG) mound, Mid-Atlantic Ridge, is regulated by the permeable conduits present between an oblique fault system and an expanding ridge-parallel fissure. The TAG mound activity is restricted to the intersection of tectonic features. High-resolution sonar and photographic images show an east-west fault on the rift-valley wall that does not extend to the mound. This indicates that the transfer fault does not regulate the fluid flow that is essential for the formation of the volcanogenic massive sulphide deposits at the mound.

Natural history, Mid-Atlantic Ridge, Hydrothermal deposits

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Evidence for fault weakness and fluid flow within an active low-angle normal fault

Article Abstract:

Results from a genetic algorithm inversion of seismic reflection information from the Moresby seamount indicate that a fault at between 4km and 5km depth contains a 33mt-thick layer with seismic velocities or around 4.3km s-1. Conditions for fault weakness and strain localization on the low-angle normal fault seem to have arisen from high extensional stresses ahead of the ridge tip and from hydrothermal fluid flow.

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Displacement rates of normal faults

Article Abstract:

Estimates of fault displacement rates have been restricted to neotectonic faults, averaged across time intervals of around 200 kyr. The estimates have been variable. Estimates of long-term normal-fault displacement rates, across time intervals from 1-40 Myr are reported, based on observed displacement decreases. Displacement rates were found to be stable over the longer time spans.

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