Electrical conductivity of carbon-bearing granulite at raised temperatures and pressures

Article Abstract:

Pressure applied to granulites containing carbon increases their electrical conductivity, but decreases the conductivity of granulites without carbon. For carbon-bearing granulites, the increased conductivity is due to carbon conduction pathways becoming reconnected during compaction, while for the carbon-free granulites the decreased conductivity is due to reduced pore connectivity. These results shed light on the unexpectedly high conductivity of the lower continental crust, and indicate carbon as the deciding factor.

Electric properties, Soils, Soil carbon, Rocks

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Channelized fluid flow in oceanic crust reconciles heat-flow and permeability data

Article Abstract:

Calculations based on a lateral flow model indicate that regional-scale oceanic crust permeabilities are substantially higher than have been measured in boreholes. It has been shown that the global data set of borehole permeability measurements in uppermost oceanic crust defines a trend with age that is in alignment with changes in seismic velocity. In contrast with a homogenous permeability model for the upper crust, this model is consistent with recorded lithostratigraphic, alteration and hydrologic heterogeneity.

Hydrothermal vent ecology, Hydrothermal vent ecosystems

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Granulite formation during continental extension in Fiordland, New Zealand

Article Abstract:

During continental rifting the metamorphism of granulite-facies occurs resulting in granulite formation. The placing of one or more metamorphic core complexes at higher structural levels leads to granulite formation in western New Zealand. The clockwise pressure-temperature time path is responsible for the granulites of Fiordland.

Influence, Surveys, New Zealand, Natural history, Continental drift, Metamorphism (Geology)

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