Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.125...55w&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 125, no. 1-4, p. 55-70
Other
Anorthosite, Carbon Isotopes, Chemical Composition, Geochemistry, Hydrogen Isotopes, Hydrothermal Systems, Igneous Rocks, Magma, Massifs, Metamorphic Rocks, Mineral Deposits, Norway, Oxygen Isotopes, Petrography, Carbon Dioxide, Carbonates, Earth Crust, Earth Mantle, Gneiss, Moisture Content, Water
Scientific paper
C and H contents and C, H and O isotopic compositions have been measured in sixteen samples of the Ana-Sira massif-type anorthosite (Rogaland, Southwest Norway) and in 30 surrounding rocks, including the metamorphic envelope and magmatic intrusions related to the anorthosite emplacement. Oxygen isotopic compositions of the Ana-Sira anorthositic massif (delta (O-18) = 6.1 +/- 0.3%) and the Tellnes orebody (delta (O-18) = 5.2 +/- 0.2%) are consistent with a pure mantle origin and show no evidence for exchange with hydrothermal fluids. The associated rocks (norites to charnockites) have delta (O-18) values (5.2 +/- 0.9%) similar to uncontaminated mantle-derived magmas. The H2O content of the rocks (magmatic or metamorphic) is lower than 0.54%, suggesting the preservation of original granulite facies conditions during cooling and uplift. Due to their cumulate origin, the anorthosites are very poor in carbon (bulk C less than 50 ppm), the volatiles having been concentrated in the residual melt. Higher carbon concentrations (up to 1484 ppm) are found in the associated intrusions. Anorthosites and gneisses close to the contacts (less than 500 m) with later intrusions show an increase in their carbon content (up to 700 ppm C), and this carbon is mainly in the form of interstitial carbonate. The carbon distribution observed at the contact between later intrusions and anorthosites as well as gneisses indicates that some CO2 has fluxed from the later magmas over a distance of a few hundred meters. This suggests only minimal lateral propagation of the fluids by diffusion or infiltration. Tentative carbon budgets suggest that most of the volatiles were transferred upwards into the overlying continental crust.
Duchesne Jean-Clair
Pineau Françoise
Rejou-Michel Agnès
Wilmart Edith
No associations
LandOfFree
Fluid transfer in anorthosites and related rocks from Rogaland (Southwest Norway): Evidence from stable isotopes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fluid transfer in anorthosites and related rocks from Rogaland (Southwest Norway): Evidence from stable isotopes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid transfer in anorthosites and related rocks from Rogaland (Southwest Norway): Evidence from stable isotopes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1254525