Subduction zone metamorphism during formation and emplacement of the Semail ophiolite in the Oman Mountains

  title={Subduction zone metamorphism during formation and emplacement of the Semail ophiolite in the Oman Mountains},
  author={Michael P. Searle and Jon Cox},
  journal={Geological Magazine},
  pages={241 - 255}
The metamorphic sole along the base of the Semail ophiolite in Oman records the earliest thrust slice subducted and accreted to the base of the ophiolite mantle sequence. In the Bani Hamid area (United Arab Emirates) a c. 870 m thick thrust slice of granulite facies rocks includes garnet+ diopside amphibolites, enstatite+cordierite+sillimanite+spinel±sapphirine quartzites, alkaline mafic granulites (meta-jacupirangites) quartzo-feldspathic gneisses and calc-silicates. The latter contain garnet… 
Structure and metamorphism beneath the obducting Oman ophiolite: Evidence from the Bani Hamid granulites, northern Oman mountains
The Cretaceous Semail ophiolite (northern Oman and the United Arab Emirates) includes an intact thrust slice of Tethyan oceanic crust and upper mantle formed above a northeast-dipping subduction zone
Rapid cooling history of a Neotethyan ophiolite: Evidence for contemporaneous subduction initiation and metamorphic sole formation
The Beyşehir-Hoyran Nappes, including Mesozoic carbonate platform rocks, deep-sea sediments, and ophiolite-related units, crop out extensively on the western limb of the Isparta Angle in the Central
Structure of the metamorphic sole to the Oman Ophiolite, Sumeini Window and Wadi Tayyin: implications for ophiolite obduction processes
Abstract Two localities where the inverted metamorphic sole of the Oman Ophiolite are best exposed, Sumeini Window and Wadi Tayyin, have been mapped and sampled in greater detail. In both areas an
Metamorphic sole rocks at the base of the mantle tectonites of the Meydan ophiolite in South-East Anatolia, Turkey, are directly overlain by sheared serpentinites and cut by unmetamorphosed mafic
The metamorphic sole of New Caledonia ophiolite: 40Ar/39Ar, U‐Pb, and geochemical evidence for subduction inception at a spreading ridge
Amphibolite lenses that locally crop out below the serpentinite sole at the base of the ophiolite of New Caledonia (termed Peridotite Nappe) recrystallized in the high‐temperature amphibolite facies
Did the Turonian–Coniacian plume pulse trigger subduction initiation in the Northern Caribbean? Constraints from 40Ar/39Ar dating of the Moa-Baracoa metamorphic sole (eastern Cuba)
The Güira de Jauco metamorphic sole, below the Moa-Baracoa ophiolite (eastern Cuba), contains strongly deformed amphibolites formed at peak metamorphic conditions of 650–660°C, approximately 8.6 kbar
Burial, Accretion, and Exhumation of the Metamorphic Sole of the Oman‐UAE Ophiolite
We conducted petrological analyses of samples collected across a 250‐m thick section of the metamorphic sole of Oman‐United Arab Emirates ophiolite. Thermobarometric calculations on
Subduction zone polarity in the Oman Mountains: implications for ophiolite emplacement
Abstract Two end-member models have been proposed to account for the structure and metamorphism of rocks beneath the Semail ophiolite in the Oman mountains. Model A involves a single, continuous


Structure and metamorphism of rocks beneath the Semail ophiolite of Oman and their significance in ophiolite obduction
Metamorphic rocks showing an inverted metamorphic zonation from upper amphibolite fades immediately beneath the peridotite to greenschist fades at lower levels, crop out discontinuously along the
Metamorphism at the base of the Samail Ophiolite, southeastern Oman Mountains
Metamorphic rocks, showing an inverted metamorphic zonation from upper amphibolite facies to greenschist facies, occur beneath the Samail ophiolite. The metamorphic protolith was a section of marine
Petrochemistry and origin of sub-ophiolitic metamorphic and related rocks in the Oman Mountains
The Semail ophiolite complex of the northern Oman Mountains was obducted during Cenomanian to Campanian (Upper Cretaceous) times onto the Arabian continental margin. During this time span, schistose
The petrogenesis of leucogranitic dykes intruding the northern Semail ophiolite, United Arab Emirates: field relationships, geochemistry and Sr/Nd isotope systematics
Abstract The Khawr Fakkan block of the Semail ophiolite (United Arab Emirates) exhibits a suite of 10–100 m scale metaluminous to peraluminous granitic intrusions, ranging from
Structure and metamorphism of blueschist–eclogite facies rocks from the northeastern Oman Mountains
The northern part of the Saih Hatat window, Oman, shows high-pressure metamorphic rocks derived from shelf sediments and pre-Premian continental basement, and is atypical of sub-ophiolite
Alkaline peridotite, pyroxenite, and gabbroic intrusions in the Oman Mountains, Arabia
High-level intrusions of highly undersaturated alkalic ultrabasic and gabbroic rocks occur in four areas of the Oman Mountains. They all intrude either the Haybi volcanic – Oman Exotic limestone
Tectonics of the Arabian margin associated with the formation and exhumation of high‐pressure rocks, Sultanate of Oman
Continental crustal rocks, now structurally beneath the allochthonous Samail ophiolite, underwent blueschist to eclogite facies metamorphism prior to the emplacement of the Oman ophiolite onto the
Tectonic setting, origin, and obduction of the Oman ophiolite
The Semail ophiolite in the Oman Mountains is the world9s largest and best preserved thrust sheet of oceanic crust and upper mantle (>10 000 km 2 , ∼550 km long, ∼150 km wide); it was emplaced onto
K-Ar ages of the metamorphic sole of the Semail Ophiolite: implications for ophiolite cooling history
K−Ar ages have been determined on micas and hornblendes in the basal metamorphic sequence and in metamorphic rocks squeezed into the mantle sequence of the Semail Ophiolite. The hornblende ages of