Other
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.144..123m&link_type=abstract
Earth and Planetary Science Letters, Volume 144, Issue 1-2, p. 123-132.
Other
22
Scientific paper
Metamorphosed oceanic gabbros provide a record of the cooling history of the lower crust near mid-ocean ridges, but the temperature range, rate, and location of subsolidus events are poorly known. We combine hornblende-plagioclase thermometry, statistical analysis, and thermal models to estimate precisely the temperature, time, distance from axis, and duration of metamorphism in East Pacific Rise gabbros from Hess Deep, ODP Hole 894G. Metamorphic hornblende and plagioclase, which formed during microfracturing and sea water penetration, equilibrated at a mean temperature of 716 +/- 8°C (90% confidence level). Comparison of the properties of the observed temperature distribution with those of model events indicates that metamorphism spanned <= 60°C. When combined with thermal models of fast-spreading centers, this implies that metamorphism was rapid (<= 6000 yr) and occurred 1-4 km off axis. Application of this approach to other gabbros will allow comparison of spatial and temporal characteristics of deformation and fluid flow in the lower oceanic crust as a function of ridge setting.
Mahon Keith I.
Manning Craig E.
Weston Patricia E.
No associations
LandOfFree
Rapid high-temperature metamorphism of East Pacific Rise gabbros from Hess Deep 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 Rapid high-temperature metamorphism of East Pacific Rise gabbros from Hess Deep, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rapid high-temperature metamorphism of East Pacific Rise gabbros from Hess Deep will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1213070