Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.114..131j&link_type=abstract
Earth and Planetary Science Letters, Volume 114, Issue 1, p. 131-148.
Physics
9
Scientific paper
Intrusion of felsic plutons of Permian age into Lower Paleozoic shale-carbonate sequences caused extensive contact metamorphism in the Oslo Rift. Oxygen and carbon isotope data from both carbonates and shales are presented to demonstrate that the progress of metamorphic reactions in the contact aureole around the Drammen granite was, to a large extent, controlled by the infiltration of water-rich fluids of a magmatic oxygen and with a carbon isotope signature. Highly integrated fluid fluxes were confined to shale-rich lithologies; massive limestones were relatively impermeable to fluid flow. The spatial distribution of isotopic and reaction fronts in the aureole and coupled 18O-13C isotope variations of carbonates from interlayered shale-carbonate units fits well to a 1-D transport model, with fluid flow away from the intrusive contact; whereas the same isotope variations in limestones containing thin shale intercalations do not. The high fluid fluxes estimated from 1-D models (> 2000 m3/m2) require either focused flow of magmatic fluids in the study area or large-scale convective flow, possibly involving fluids of meteoric origin. Limited kinetic broadening of the oxygen isotopic front indicates fluid fluxes of < 10-8 m/s. Fluid flow must have persisted for > 104 yr to have moved the oxygen front 1000 m from the intrusive contact.
Simple 2-D transport models, involving dominant fluid flow along aquifers or fractures and involving diffusion as well as advection, explain most of the coupled 18O-13C trends reported for carbonates from contact aureoles.
Bucher-Nurminen Kurt
Grorud Hans Fredrik
Jamtveit Bjørn
No associations
LandOfFree
Contact metamorphism of layered carbonate-shale sequences in the Oslo Rift. II: Migration of isotopic and reaction fronts around cooling plutons 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 Contact metamorphism of layered carbonate-shale sequences in the Oslo Rift. II: Migration of isotopic and reaction fronts around cooling plutons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contact metamorphism of layered carbonate-shale sequences in the Oslo Rift. II: Migration of isotopic and reaction fronts around cooling plutons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1114303