High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway
Rocks occurring in narrow shear zones (<4 m wide) in a gabbro–anorthosite near Nusfjord, Flakstadøy, Lofoten, Norway, include Cl-enriched mineral assemblages, Cl-free mineral assemblages and eclogite-facies assemblages. Mineral equilibria calculations suggest that the different mineral assemblage...
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2001
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fthighwire:oai:open-archive.highwire.org:petrology:42/7/1349 2023-05-15T17:08:15+02:00 High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway KULLERUD, KÅRE FLAAT, KJERSTI DAVIDSEN, BØRRE 2001-07-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/42/7/1349 https://doi.org/10.1093/petrology/42.7.1349 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/42/7/1349 http://dx.doi.org/10.1093/petrology/42.7.1349 Copyright (C) 2001, Oxford University Press ARTICLES TEXT 2001 fthighwire https://doi.org/10.1093/petrology/42.7.1349 2013-05-27T16:28:40Z Rocks occurring in narrow shear zones (<4 m wide) in a gabbro–anorthosite near Nusfjord, Flakstadøy, Lofoten, Norway, include Cl-enriched mineral assemblages, Cl-free mineral assemblages and eclogite-facies assemblages. Mineral equilibria calculations suggest that the different mineral assemblages formed under similar pressure and temperature conditions, at <rm>P</rm> = 11–14 kbar and <rm>T</rm> = 650–700°C. One reason for the mineralogical variations of the shear zones is that the rocks evolved from three distinctly different protolith types. Interactions between the rocks and an externally derived Cl-bearing hydrous fluid during shear zone formation resulted in a strong fractionation of the hydrous fluid, and extreme compositional variations of the hydrous mineral phases that formed in equilibrium with the fluid. Parts of the shear zone rocks experienced multiple infiltrations of fluids of different compositions because of local fluctuations of the fluid phase during the fluid–rock interactions. During the deformation, the externally derived fluid was introduced through the transiently highly permeable central parts of the shear zones. The fraction of the fluid that did not escape was rapidly consumed during subsequent hydration reactions. Text Lofoten HighWire Press (Stanford University) Flakstadøy ENVELOPE(13.299,13.299,68.067,68.067) Lofoten Norway Nusfjord ENVELOPE(13.348,13.348,68.035,68.035) Journal of Petrology 42 7 1349 1372 |
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HighWire Press (Stanford University) |
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English |
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ARTICLES |
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ARTICLES KULLERUD, KÅRE FLAAT, KJERSTI DAVIDSEN, BØRRE High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway |
topic_facet |
ARTICLES |
description |
Rocks occurring in narrow shear zones (<4 m wide) in a gabbro–anorthosite near Nusfjord, Flakstadøy, Lofoten, Norway, include Cl-enriched mineral assemblages, Cl-free mineral assemblages and eclogite-facies assemblages. Mineral equilibria calculations suggest that the different mineral assemblages formed under similar pressure and temperature conditions, at <rm>P</rm> = 11–14 kbar and <rm>T</rm> = 650–700°C. One reason for the mineralogical variations of the shear zones is that the rocks evolved from three distinctly different protolith types. Interactions between the rocks and an externally derived Cl-bearing hydrous fluid during shear zone formation resulted in a strong fractionation of the hydrous fluid, and extreme compositional variations of the hydrous mineral phases that formed in equilibrium with the fluid. Parts of the shear zone rocks experienced multiple infiltrations of fluids of different compositions because of local fluctuations of the fluid phase during the fluid–rock interactions. During the deformation, the externally derived fluid was introduced through the transiently highly permeable central parts of the shear zones. The fraction of the fluid that did not escape was rapidly consumed during subsequent hydration reactions. |
format |
Text |
author |
KULLERUD, KÅRE FLAAT, KJERSTI DAVIDSEN, BØRRE |
author_facet |
KULLERUD, KÅRE FLAAT, KJERSTI DAVIDSEN, BØRRE |
author_sort |
KULLERUD, KÅRE |
title |
High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway |
title_short |
High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway |
title_full |
High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway |
title_fullStr |
High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway |
title_full_unstemmed |
High-pressure Fluid-Rock Reactions involving Cl-bearing Fluids in Lower-crustal Ductile Shear Zones of the Flakstadoy Basic Complex, Lofoten, Norway |
title_sort |
high-pressure fluid-rock reactions involving cl-bearing fluids in lower-crustal ductile shear zones of the flakstadoy basic complex, lofoten, norway |
publisher |
Oxford University Press |
publishDate |
2001 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/42/7/1349 https://doi.org/10.1093/petrology/42.7.1349 |
long_lat |
ENVELOPE(13.299,13.299,68.067,68.067) ENVELOPE(13.348,13.348,68.035,68.035) |
geographic |
Flakstadøy Lofoten Norway Nusfjord |
geographic_facet |
Flakstadøy Lofoten Norway Nusfjord |
genre |
Lofoten |
genre_facet |
Lofoten |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/42/7/1349 http://dx.doi.org/10.1093/petrology/42.7.1349 |
op_rights |
Copyright (C) 2001, Oxford University Press |
op_doi |
https://doi.org/10.1093/petrology/42.7.1349 |
container_title |
Journal of Petrology |
container_volume |
42 |
container_issue |
7 |
container_start_page |
1349 |
op_container_end_page |
1372 |
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1766063964175728640 |