Fluid pressure variations recorded by quartz vein geochemistry
International audience Veins that form contemporaneously with deformation are the best recorders of the fluids circulating in the depths of orogenic and subduction zones. We have analyzed syn-kinematic quartz veins from accretionary prisms (Shimanto Belt in Japan, Kodiak accretionary Complex in Alas...
Main Authors: | , , , , , , |
---|---|
Other Authors: | , , , , , , , , , |
Format: | Conference Object |
Language: | English |
Published: |
HAL CCSD
2021
|
Subjects: | |
Online Access: | https://hal.science/hal-03554525 https://hal.science/hal-03554525/document https://hal.science/hal-03554525/file/EGU21-10074-print.pdf https://doi.org/10.5194/egusphere-egu21-10074 |
id |
ftbrgm:oai:HAL:hal-03554525v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Raimbourg, Hugues Famin, Vincent Rajic, Kristijan Erdmann, Saskia Moris-Muttoni, Benjamin Fisher, Donald Morell, Kristin Fluid pressure variations recorded by quartz vein geochemistry |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Veins that form contemporaneously with deformation are the best recorders of the fluids circulating in the depths of orogenic and subduction zones. We have analyzed syn-kinematic quartz veins from accretionary prisms (Shimanto Belt in Japan, Kodiak accretionary Complex in Alaska) and tectonic nappes in collisional orogens (Flysch à Helminthoïdes in the Alps, southern nappes of the variscan Montagne Noire), which formed at temperature conditions between 250 and 350°C, i.e. spanning the downdip limit of large subduction earthquakes and the generation of slow slip events. In all geological domains, veins hosted in rocks that have experienced the lower temperature conditions (~250-300°C) show quartz grains with crystallographic facets and growth rims. Cathodoluminescence (CL) imaging of these growth rims shows two different colors, a short-lived blue color and a brown one, attesting to cyclic variations in precipitation conditions. In contrast, veins hosted in rocks that have experienced the higher temperature conditions (~350°C), show a homogeneous, CL-brown colored quartz, except for some very restricted domains of crack-seal structures of CL-blue quartz found in Japan, Kodiak and Montagne Noire.Based on laser ablation analysis and electron microprobe mapping, variations in CL colors appear correlated with the trace element content of quartz. The highly luminescent quartz contains high concentrations of aluminum (Al) and lithium (Li), up to 3000 and 400 ppm, respectively. Variations in Al and Li correlate well, so that Li appears as the main charge compensating cation for SiàAl substitution.Due to their ubiquitous presence in various settings, the variations in CL colors in the lower temperature range reflect a common, general process. We interpret these cyclic growth structures as a result of deformation/fracturing events, which triggered transient changes in fluid pressure. The CL-blue growth rims delineate zones where quartz growth was rapid and crystals incorporated a large proportion ... |
author2 |
Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Géodynamique - UMR7327 Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Conference Object |
author |
Raimbourg, Hugues Famin, Vincent Rajic, Kristijan Erdmann, Saskia Moris-Muttoni, Benjamin Fisher, Donald Morell, Kristin |
author_facet |
Raimbourg, Hugues Famin, Vincent Rajic, Kristijan Erdmann, Saskia Moris-Muttoni, Benjamin Fisher, Donald Morell, Kristin |
author_sort |
Raimbourg, Hugues |
title |
Fluid pressure variations recorded by quartz vein geochemistry |
title_short |
Fluid pressure variations recorded by quartz vein geochemistry |
title_full |
Fluid pressure variations recorded by quartz vein geochemistry |
title_fullStr |
Fluid pressure variations recorded by quartz vein geochemistry |
title_full_unstemmed |
Fluid pressure variations recorded by quartz vein geochemistry |
title_sort |
fluid pressure variations recorded by quartz vein geochemistry |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03554525 https://hal.science/hal-03554525/document https://hal.science/hal-03554525/file/EGU21-10074-print.pdf https://doi.org/10.5194/egusphere-egu21-10074 |
op_coverage |
Online, France |
genre |
Kodiak Alaska |
genre_facet |
Kodiak Alaska |
op_source |
vEGU21: Gather Online https://hal.science/hal-03554525 vEGU21: Gather Online, Apr 2021, Online, France. ⟨10.5194/egusphere-egu21-10074⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-10074 hal-03554525 https://hal.science/hal-03554525 https://hal.science/hal-03554525/document https://hal.science/hal-03554525/file/EGU21-10074-print.pdf BIBCODE: 2021EGUGA.2310074R doi:10.5194/egusphere-egu21-10074 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/egusphere-egu21-10074 |
_version_ |
1799483246566703104 |
spelling |
ftbrgm:oai:HAL:hal-03554525v1 2024-05-19T07:43:31+00:00 Fluid pressure variations recorded by quartz vein geochemistry Raimbourg, Hugues Famin, Vincent Rajic, Kristijan Erdmann, Saskia Moris-Muttoni, Benjamin Fisher, Donald Morell, Kristin Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Géodynamique - UMR7327 Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Online, France 2021-04-19 https://hal.science/hal-03554525 https://hal.science/hal-03554525/document https://hal.science/hal-03554525/file/EGU21-10074-print.pdf https://doi.org/10.5194/egusphere-egu21-10074 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-10074 hal-03554525 https://hal.science/hal-03554525 https://hal.science/hal-03554525/document https://hal.science/hal-03554525/file/EGU21-10074-print.pdf BIBCODE: 2021EGUGA.2310074R doi:10.5194/egusphere-egu21-10074 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess vEGU21: Gather Online https://hal.science/hal-03554525 vEGU21: Gather Online, Apr 2021, Online, France. ⟨10.5194/egusphere-egu21-10074⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/conferenceObject Conference papers 2021 ftbrgm https://doi.org/10.5194/egusphere-egu21-10074 2024-05-02T00:12:28Z International audience Veins that form contemporaneously with deformation are the best recorders of the fluids circulating in the depths of orogenic and subduction zones. We have analyzed syn-kinematic quartz veins from accretionary prisms (Shimanto Belt in Japan, Kodiak accretionary Complex in Alaska) and tectonic nappes in collisional orogens (Flysch à Helminthoïdes in the Alps, southern nappes of the variscan Montagne Noire), which formed at temperature conditions between 250 and 350°C, i.e. spanning the downdip limit of large subduction earthquakes and the generation of slow slip events. In all geological domains, veins hosted in rocks that have experienced the lower temperature conditions (~250-300°C) show quartz grains with crystallographic facets and growth rims. Cathodoluminescence (CL) imaging of these growth rims shows two different colors, a short-lived blue color and a brown one, attesting to cyclic variations in precipitation conditions. In contrast, veins hosted in rocks that have experienced the higher temperature conditions (~350°C), show a homogeneous, CL-brown colored quartz, except for some very restricted domains of crack-seal structures of CL-blue quartz found in Japan, Kodiak and Montagne Noire.Based on laser ablation analysis and electron microprobe mapping, variations in CL colors appear correlated with the trace element content of quartz. The highly luminescent quartz contains high concentrations of aluminum (Al) and lithium (Li), up to 3000 and 400 ppm, respectively. Variations in Al and Li correlate well, so that Li appears as the main charge compensating cation for SiàAl substitution.Due to their ubiquitous presence in various settings, the variations in CL colors in the lower temperature range reflect a common, general process. We interpret these cyclic growth structures as a result of deformation/fracturing events, which triggered transient changes in fluid pressure. The CL-blue growth rims delineate zones where quartz growth was rapid and crystals incorporated a large proportion ... Conference Object Kodiak Alaska BRGM: HAL (Bureau de Recherches Géologiques et Minières) |