Kleinefeld, Bärbel; Bakker, R J (2002): Chemistry of fluid inclusions in rock samples from Dronning Maud Land [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.736480, Supplement to: Kleinefeld, B; Bakker, RJ (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
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Abstract:
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.
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
Event(s):
GeoMaud95/96_1583 * Latitude: -71.341667 * Longitude: 13.396667 * Elevation: 820.0 m * Location: Zimmermannberg * Campaign: GeoMaud95/96 * Basis: Sampling on land * Method/Device: Geological sample (GEOS) * Comment: anorthosite/colour: light
GeoMaud95/96_1588-1A * Latitude: -71.353333 * Longitude: 13.426667 * Elevation: 700.0 m * Location: SE Untersee * Campaign: GeoMaud95/96 * Basis: Sampling on land * Method/Device: Geological sample (GEOS) * Comment: anorthosite with shear plane (tonalitic)/colour: light
GeoMaud95/96_1588-1B * Latitude: -71.353333 * Longitude: 13.426667 * Elevation: 700.0 m * Location: SE Untersee * Campaign: GeoMaud95/96 * Basis: Sampling on land * Method/Device: Geological sample (GEOS) * Comment: anorthosite with shear plane (tonalitic)/colour: light
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Kleinefeld, B; Bakker, RJ (2002): (Table A1) Microprobe analysis of plagioclase around fluid inclusions in Gruber Fjella Anorthosite-sample 1583. https://doi.org/10.1594/PANGAEA.736471
- Kleinefeld, B; Bakker, RJ (2002): (Table 1) Microthermometrical data of carbonic fluid inclusions of rock sample from Dronning Maud Land. https://doi.org/10.1594/PANGAEA.81498