2001
DOI: 10.1046/j.1468-8123.2001.00011.x
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Fluid trapping at the brittle–ductile transition re‐examined

Abstract: The brittle–ductile transition has been suggested to provide a mechanical trap to deep crustal fluids. The mechanism was advanced as a way of reconciling the geophysical case for a wet lower crust, founded on the revelation of deep crustal electrical conductors and seismic reflectors, with the problem of maintaining interconnected, low‐density fluids in stable crust for geologically significant timescales. Although some deep crustal conductors are now attributed to graphite, the hypothesis of fluid trapping at… Show more

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Cited by 49 publications
(17 citation statements)
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“…Generally, the BDT depends on temperature as well as mineralogy and strain rate (Fournier, 1999;Ingebritsen, 2012;Simpson, 2001). For simplicity, we consider the contact zone Є-1 as permeable rock when magmatic volatiles were expelled.…”
Section: Accepted M Manuscriptmentioning
confidence: 99%
“…Generally, the BDT depends on temperature as well as mineralogy and strain rate (Fournier, 1999;Ingebritsen, 2012;Simpson, 2001). For simplicity, we consider the contact zone Є-1 as permeable rock when magmatic volatiles were expelled.…”
Section: Accepted M Manuscriptmentioning
confidence: 99%
“…Under a normal intraplate stress and strain regime, the temperatures at which orthopyroxene undergoes the transition from brittle to ductile rheology, varies from 610 to ∼700 • C (Simpson, 2001). At such high temperatures (630-690 • C; John and Schenek, 2003) and pressures, mafic volcanic magmas can be partially transformed into eclogite through the process of regional metamorphism.…”
Section: Resultsmentioning
confidence: 99%
“…Further, since P-wave velocities (6.4-6.9 km/s) and resultant densities (2.87-3.01 g/cm 3 ) are significantly high at subsurface depths, the presence of appreciable porosity or permeability within in situ rocks, characterizing seismogenic depth range, is unlikely (Simpson, 2001). In such case, the conductive anomaly in all likelihood would reflect to upwarp mafic crust, rather than fluid filled rock matrix, as suggested earlier by many MT workers.…”
Section: Discussionmentioning
confidence: 99%