From basin to basement: the movement of surface fluids into the crust

Gleeson, S. A.; Yardley, Bruce; Boyce, A. J.; Fallick, A. E.; Munz, I.-A.

doi:10.1016/S0375-6742(00)00114-X

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From basin to basement: the movement of surface fluids into the crust

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Gleeson, S. A.
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Yardley, Bruce
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Boyce, A. J.
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Fallick, A. E.
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Munz, I.-A.
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Gleeson, S. A., Yardley, B., Boyce, A. J., Fallick, A. E., Munz, I.-A. (2000): From basin to basement: the movement of surface fluids into the crust. - Journal of Geochemical Exploration, 69-70, 527-531.
https://doi.org/10.1016/S0375-6742(00)00114-X

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1943914

Abstract

Quartz veins from Precambrian, high grade, basement rocks in Southern Norway contain both aqueous and biogenically sourced hydrocarbon fluid inclusions. Aqueous fluids show a wide range in salinities (0-40 wt% NaCl eq.) and densities (0.80-1.16 g/cm(3)) but the ultimate source of this salinity is unclear. The oxygen isotopic composition of most of the veins is dominated by the host-rock compositions. Surface derived fluids migrated downwards as a result of extension of dry crystalline basement rocks with pore fluid pressures less than hydrostatic. Quartz precipitation occurred in the veins initially at near hydrostatic pressures but later quartz generations were precipitated at pressures closer to lithostatic.