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| Titel |
Syn-collision Pliocene-Quaternary volcanism in NE Iran: mantle melting on the periphery of the Turkish-Iranian Plateau |
| VerfasserIn |
Monireh Kheirkhah, Iain Neill, Mark Allen |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250092429
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| Publikation (Nr.) |
 EGU/EGU2014-6774.pdf |
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| Zusammenfassung |
| NE Iran is part of the Turkish-Iranian Plateau, but lies up to 1000 km from the Zagros suture
zone. The Plateau formed during the Late Cenozoic, as part of the Arabia-Eurasia collision
zone. Collision began at ~30 Ma, and is still active. There has probably been break-off of the
Tethyan oceanic slab under the Plateau at some stage, but the constraints are not precise.
Many recent mafic, mantle-derived volcanic centres in NW Iran, E Turkey and
Armenia post-date the initial collision and are derived from subduction-modified
lithospheric mantle sources. These centres can be attributed individually to slab
break-off, lithospheric thickening, and small-scale lithospheric delamination close to the
suture.
The few studies of mafic magmatism in E and NE Iran indicate largely ocean island basalt
(OIB)-like sources. Volcanic rocks from the Faruj area within the Binaloud Range fall into
two distinct categories: Pliocene-Quaternary mafic alkaline rocks and more felsic samples
with adakite-like affinities of uncertain age. We present new major, trace element and
radiogenic isotope results focussing in particular on the mafic rocks from Faruj as a guide to
the nature of the upper mantle beneath the region and its relationship to Mesozoic-Cenozoic
collision processes.
The mafic rocks are trachybasalts with ~48 wt.% SiO2, moderate MgO (Mg# = 54-59),
high Ni ( |
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