Metamorphism and deformation along the emplacement thrust of the Samail ophiolite, Oman

B. R. Hacker, J. L. Mosenfelder

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The base of the Samail ophiolite is a metamorphic shear zone that provides key information about ophiolite emplacement. The classic exposure of this metamorphic sole at Wadi Tayin consists of a few meters of garnet-clinopyroxene mafic gneiss and 80 m of upper amphibolite facies mafic and quartzose tectonite, overlying 150 m of lower amphibolite facies mafic and sedimentary schist. The sole is bounded by faults but is internally coherent. Peak metamorphic temperatures decrease exponentially, from ∼ 825°C at the top of the sole to ∼ 500°C at its base, as documented by changes in grain size, hornblende composition, the disappearance of chlorite and epidote, garnet-clinopyroxene element partitioning, and garnet-hornblende partitioning. The inverted peak temperature gradient decreases from > 4000°C/km in the upper 50 m to ∼ 100°C/km in the lower 150 m. Contrary to earlier reports, greenschist-facies tectonites are not present at Wadi Tayin, although the entire sole underwent greenschist-facies retrogression, driven by the influx of fluids from the overlying peridotite or underlying carbonate. Calculations based on an amphibolite constitutive relation reveal that, although the section represents a lithologic continuum, the lower 200 m of the sole is a relatively undeformed block whereas the uppermost 25 m represent material initially separated by tens to a couple of hundreds of kilometers and now integrated into a single column.

Original languageEnglish (US)
Pages (from-to)435-451
Number of pages17
JournalEarth and Planetary Science Letters
Issue number3-4
StatePublished - Nov 1996

Bibliographical note

Funding Information:
Hilal Bin MohammedA l-Azri, Director of the GeologicalS urvey,M inistry of Petroleuma ndMin-erals, Sultanateo f Oman, provided lightningf ast expertl ogisticals upportR. obertC olemana nd Aley El-Shazlyk indly helpedg et thep rojectr olling.M ike Searlew as very generousw ith mapsa nddirections. Tjerk Petersp rovidedh elpful reprints.H acker was funded by NSF grant EAR-9204741,a nd Mosen-felderw as supportedb y the McGee and Shell funds at StanfordU niversitya ndb y a GSA PenroseG rant. Reviewedb y W.G. Ernst,E . Gnos. J. Hawkins,C . Hopson,a ndJ .G. Liou. [Mti


  • Emplacement
  • Oman
  • Ophiolite
  • Prograde metamorphism
  • Retrograde metamorpbism
  • Subduction
  • United Arab Emirates


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