Chemistry of fluid inclusions in rock samples from Dronning Maud Land
Dense, CO2-rich fluid inclusions hosted by plagioclases, An45 to An54, of the O.-v.-Gruber- Anorthosite body, central Dronning Maud Land, East Antarctica, contain varying amounts of small calcite, paragonite and pyrophyllite crystals detected by Raman microspectroscopy. These crystals are reaction p...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.736480 2023-05-15T13:42:10+02:00 Chemistry of fluid inclusions in rock samples from Dronning Maud Land Kleinefeld, Bärbel Bakker, R J MEDIAN LATITUDE: -71.344778 * MEDIAN LONGITUDE: 13.404667 * SOUTH-BOUND LATITUDE: -71.353333 * WEST-BOUND LONGITUDE: 13.396667 * NORTH-BOUND LATITUDE: -71.341667 * EAST-BOUND LONGITUDE: 13.426667 2002-04-08 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.736480 https://doi.org/10.1594/PANGAEA.736480 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.736480 https://doi.org/10.1594/PANGAEA.736480 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kleinefeld, Bärbel; Bakker, R J (2002): Fluid inclusions as micro-chemical systems: evidence and modelling of fluid-rock interactions in plagioclase. Journal of Metamorphic Geology, 20(9), 845-858, https://doi.org/10.1046/j.1525-1314.2002.00411.x Geological sample GeoMaud95/96 GeoMaud95/96_1583 GeoMaud95/96_1588-1A GeoMaud95/96_1588-1B GEOS Sampling on land SE Untersee Zimmermannberg Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.736480 https://doi.org/10.1046/j.1525-1314.2002.00411.x 2023-01-20T07:31:44Z Dense, CO2-rich fluid inclusions hosted by plagioclases, An45 to An54, of the O.-v.-Gruber- Anorthosite body, central Dronning Maud Land, East Antarctica, contain varying amounts of small calcite, paragonite and pyrophyllite crystals detected by Raman microspectroscopy. These crystals are reaction products that have formed during cooling of the host and the original CO2-rich H2O-bearing enclosed fluid. Variable amounts of these reaction products illustrates that the reaction did not take place uniformly in all fluid inclusions, possibly due to differences in kinetics as caused by differences in shape and size, or due to compositional variation in the originally trapped fluid. The reaction albite + 2anorthite + 2H2O + 2CO2 = pyrophyllite + paragonite + 2calcite was thermodynamically modelled with consideration of different original fluid compositions. Although free H2O is not detectable in most fluid inclusions, the occurrence of OH-bearing sheet silicates indicates that the original fluid was not pure CO2, but contained significant amounts of H2O. Compared to an actual fluid inclusion it is obvious, that volume estimations of solid phases can be used as a starting point to reverse the retrograde reaction and recalculate the compositional and volumetrical properties of the original fluid. Isochores for an unmodified inclusion can thus be reconstructed, leading to a more realistic estimation of P–T conditions during earlier metamorphic stages or fluid capturing. Dataset Antarc* Antarctica Dronning Maud Land East Antarctica PANGAEA - Data Publisher for Earth & Environmental Science East Antarctica Dronning Maud Land Untersee ENVELOPE(13.467,13.467,-71.350,-71.350) Zimmermannberg ENVELOPE(13.317,13.317,-71.350,-71.350) ENVELOPE(13.396667,13.426667,-71.341667,-71.353333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Geological sample GeoMaud95/96 GeoMaud95/96_1583 GeoMaud95/96_1588-1A GeoMaud95/96_1588-1B GEOS Sampling on land SE Untersee Zimmermannberg |
spellingShingle |
Geological sample GeoMaud95/96 GeoMaud95/96_1583 GeoMaud95/96_1588-1A GeoMaud95/96_1588-1B GEOS Sampling on land SE Untersee Zimmermannberg Kleinefeld, Bärbel Bakker, R J Chemistry of fluid inclusions in rock samples from Dronning Maud Land |
topic_facet |
Geological sample GeoMaud95/96 GeoMaud95/96_1583 GeoMaud95/96_1588-1A GeoMaud95/96_1588-1B GEOS Sampling on land SE Untersee Zimmermannberg |
description |
Dense, CO2-rich fluid inclusions hosted by plagioclases, An45 to An54, of the O.-v.-Gruber- Anorthosite body, central Dronning Maud Land, East Antarctica, contain varying amounts of small calcite, paragonite and pyrophyllite crystals detected by Raman microspectroscopy. These crystals are reaction products that have formed during cooling of the host and the original CO2-rich H2O-bearing enclosed fluid. Variable amounts of these reaction products illustrates that the reaction did not take place uniformly in all fluid inclusions, possibly due to differences in kinetics as caused by differences in shape and size, or due to compositional variation in the originally trapped fluid. The reaction albite + 2anorthite + 2H2O + 2CO2 = pyrophyllite + paragonite + 2calcite was thermodynamically modelled with consideration of different original fluid compositions. Although free H2O is not detectable in most fluid inclusions, the occurrence of OH-bearing sheet silicates indicates that the original fluid was not pure CO2, but contained significant amounts of H2O. Compared to an actual fluid inclusion it is obvious, that volume estimations of solid phases can be used as a starting point to reverse the retrograde reaction and recalculate the compositional and volumetrical properties of the original fluid. Isochores for an unmodified inclusion can thus be reconstructed, leading to a more realistic estimation of P–T conditions during earlier metamorphic stages or fluid capturing. |
format |
Dataset |
author |
Kleinefeld, Bärbel Bakker, R J |
author_facet |
Kleinefeld, Bärbel Bakker, R J |
author_sort |
Kleinefeld, Bärbel |
title |
Chemistry of fluid inclusions in rock samples from Dronning Maud Land |
title_short |
Chemistry of fluid inclusions in rock samples from Dronning Maud Land |
title_full |
Chemistry of fluid inclusions in rock samples from Dronning Maud Land |
title_fullStr |
Chemistry of fluid inclusions in rock samples from Dronning Maud Land |
title_full_unstemmed |
Chemistry of fluid inclusions in rock samples from Dronning Maud Land |
title_sort |
chemistry of fluid inclusions in rock samples from dronning maud land |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.736480 https://doi.org/10.1594/PANGAEA.736480 |
op_coverage |
MEDIAN LATITUDE: -71.344778 * MEDIAN LONGITUDE: 13.404667 * SOUTH-BOUND LATITUDE: -71.353333 * WEST-BOUND LONGITUDE: 13.396667 * NORTH-BOUND LATITUDE: -71.341667 * EAST-BOUND LONGITUDE: 13.426667 |
long_lat |
ENVELOPE(13.467,13.467,-71.350,-71.350) ENVELOPE(13.317,13.317,-71.350,-71.350) ENVELOPE(13.396667,13.426667,-71.341667,-71.353333) |
geographic |
East Antarctica Dronning Maud Land Untersee Zimmermannberg |
geographic_facet |
East Antarctica Dronning Maud Land Untersee Zimmermannberg |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica |
op_source |
Supplement to: Kleinefeld, Bärbel; Bakker, R J (2002): Fluid inclusions as micro-chemical systems: evidence and modelling of fluid-rock interactions in plagioclase. Journal of Metamorphic Geology, 20(9), 845-858, https://doi.org/10.1046/j.1525-1314.2002.00411.x |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.736480 https://doi.org/10.1594/PANGAEA.736480 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.736480 https://doi.org/10.1046/j.1525-1314.2002.00411.x |
_version_ |
1766163760492314624 |