The ophiolite massif of Kahnuj (western Makran, southern Iran): new geological and geochronological data

Kananian, Ali; Juteau, Thierry; Bellón, Hervé; Darvishzadeh, A; Sabzehi, Mossaieb; Whitechurch, Hubert; Ricou, Luc-Emmanuel

doi:10.1016/s1251-8050(01)01574-9

Cited by 19 publications

(25 citation statements)

References 14 publications

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“…More to the SE, supra-subduction plagiogranites were dated at 93-88 Ma by K-Ar on whole rock by Kananian et al (2001), and MidCretaceous 40 Ar/ 39 Ar ages are also reported from blueschists in the Zagros region (Agard et al 2006(Agard et al , 2007. These data provide evidence that the same subduction front was active from NW Turkey to N Armenia, contemporaneously to subduction in the S Iran Zagros Subduction Zone.…”

Section: Lateral Correlations With Other Tethyan Suture Zonesmentioning

confidence: 69%

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Blueschists of the Amassia-Stepanavan Suture Zone (Armenia): linking Tethys subduction history from E-Turkey to W-Iran

Rolland

Billo

Corsini

et al. 2007

Int J Earth Sci (Geol Rundsch)

112

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International audienceThe Amassia–Stepanavan blueschist-ophiolite complex of the Lesser Caucasus in NW Armenia is part of an Upper Cretaceous-Cenozoic belt, which presents similar metamorphic features as other suture zones from Turkey to Iran. The blueschists include calcschists, metaconglomerates, quartzites, gneisses and metabasites, suggesting a tectonic mélange within an accretionary prism. This blueschist mélange is tectonically overlain by a low-metamorphic grade ophiolite sequence composed of serpentinites, gabbro-norite pods, plagiogranites, basalts and radiolarites. The metabasites include high-P assemblages (glaucophane–aegirine–clinozoisite–phengite), which indicate maximal burial pressure of ∼1.2 GPa at ∼550°C. Most blueschists show evidence of greenschist retrogression (chlorite—epidote, actinolite), but locally epidote-amphibolite conditions were attained (garnet—epidote, Ca/Na amphibole) at a pressure of ∼0.6 GPa and a temperature of ∼500°C. This LP–MT retrogression is coeval with exhumation and nappe-stacking of lower grade units over higher grade ones. 40Ar/39Ar phengite ages obtained on the high-P assemblages range between 95 and 90 Ma, while ages obtained for epidote-amphibolite retrogression assemblages range within 73.5–71 Ma. These two metamorphic phases are significant of (1) HP metamorphism during a phase of subduction in the Cenomanian–Turonian times followed by (2) exhumation in the greenschist to epidote-amphibolite facies conditions during the Upper Campanian/Maastrichtian due to the onset of continental subduction of the South Armenian block below Eurasia

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Section: Lateral Correlations With Other Tethyan Suture Zonesmentioning

confidence: 69%

“…), but they remain undated. Along the probable lateral continuation of this SE Turkey suture, in western and southern Iran, subduction age is constrained by the emplacement of suprasubduction plagiogranites dated at 93-88 Ma by K-Ar (Kananian et al 2001), and by Mid-Upper Cretaceous 40 Ar/ 39 Ar ages (Agard et al 2006).…”

Section: Geological Settingmentioning

confidence: 99%

Blueschists of the Amassia-Stepanavan Suture Zone (Armenia): linking Tethys subduction history from E-Turkey to W-Iran

Rolland

Billo

Corsini

et al. 2007

Int J Earth Sci (Geol Rundsch)

112

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“…Nain, ShahrBabak, Sabzevar, Tchehel Kureh and Band-e-Zeyarat, also known as the Kahnuj ophiolite (Kananian et al, 2001), formed in a narrow seaway opened during Mesozoic times between the Sanandaj-Sirjan metamorphic belt and the Central Iran Block. The authors conclude that they prefer this second hypothesis.…”

Section: Geodynamic Evolutionmentioning

confidence: 99%

New geological, geochronological and geochemical investigations on the Khoy ophiolites and related formations, NW Iran

Khalatbari-Jafari

Juteau

Bellón

et al. 2004

Journal of Asian Earth Sciences

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“…Northern Makran ophiolites are associated with limestones and radiolarites, which are laminated in some places. The Kahnuj ophiolite crops out in the western Jaz Murian depression; it includes the Band-e-Ziyarat plutonic complex and the Dar Anar volcanic complex (Kananiana et al, 2001;Hunziker et al, 2015). The complex includes layered and nonlayered gabbros, some trondjhemitic rocks and a basic sheeted dyke complex.…”

Section: Northern Makran Geology (Inner Makran)mentioning

confidence: 99%

Iranshahr blueschist: subduction of the inner Makran oceanic crust

Omrani

Moazzen

Oberhänsli

et al. 2016

Journal Metamorphic Geology

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The Makran accretionary prism in SE Iran and SW Pakistan is one of the most extensive subduction accretions on Earth. It is characterized by intense folding, thrust faulting and dislocation of the Cenozoic units that consist of sedimentary, igneous and metamorphic rocks. Rock units forming the northern Makran ophiolites are amalgamated as a mélange. Metamorphic rocks, including greenschist, amphibolite and blueschist, resulted from metamorphism of mafic rocks and serpentinites. In spite of the geodynamic significance of blueschist in this area, it has been rarely studied. Peak metamorphic phases of the northern Makran mafic blueschist in the Iranshahr area are glaucophane, phengite, quartz±omphacite+epidote. Post peak minerals are chlorite, albite and calcic amphibole. Blueschist facies metasedimentary rocks contain garnet, phengite, albite and epidote in the matrix and as inclusions in glaucophane. The calculated P–T pseudosection for a representative metabasic glaucophane schist yields peak pressure and temperature of 11.5–15 kbar at 400–510 °C. These rocks experienced retrograde metamorphism from blueschist to greenschist facies (350–450 °C and 7–8 kbar) during exhumation. A back arc basin was formed due to northward subduction of Neotethys under Eurasia (Lut block). Exhumation of the high‐pressure metamorphic rocks in northern Makran occurred contemporarily with subduction. Several reverse faults played an important role in exhumation of the ophiolitic and HP‐LT rocks. The presence of serpentinite shows the possible role of a serpentinite diapir for exhumation of the blueschist. A tectonic model is proposed here for metamorphism and exhumation of oceanic crust and accretionary sedimentary rocks of the Makran area. Vast accretion of subducted materials caused southward migration of the shore.

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The ophiolite massif of Kahnuj (western Makran, southern Iran): new geological and geochronological data

Cited by 19 publications

References 14 publications

Blueschists of the Amassia-Stepanavan Suture Zone (Armenia): linking Tethys subduction history from E-Turkey to W-Iran

Blueschists of the Amassia-Stepanavan Suture Zone (Armenia): linking Tethys subduction history from E-Turkey to W-Iran

New geological, geochronological and geochemical investigations on the Khoy ophiolites and related formations, NW Iran

Iranshahr blueschist: subduction of the inner Makran oceanic crust

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