U–Pb zircon ages of Late Cretaceous Nain–Dehshir ophiolites, central Iran
Hadi Shafaii Moghadam
Fernando Corfu
Robert J. Stern
10.6084/m9.figshare.3453143.v1
https://geolsoc.figshare.com/articles/dataset/U_Pb_zircon_ages_of_Late_Cretaceous_Nain_Dehshir_ophiolites_central_Iran/3453143
<p>Late Cretaceous Zagros ophiolites are part of the <em>c</em>. 3000 km long Late Cretaceous Ophiolite Belt of SW Asia including the Troodos (Cyprus), eastern Mediterranean (Turkey, Syria),
Zagros (Iran) and Semail ophiolites (Oman). This ophiolite belt represents a magmatic forearc that formed when subduction
of the Neotethys began along the SW margin of Eurasia. Geochronological data for Zagros ophiolites are limited to a few K–Ar
and <sup>40</sup>Ar–<sup>39</sup>Ar ages. New thermal ionization mass spectrometry U–Pb zircon ages indicate that the Nain and Dehshir ophiolites of central
Iran formed <em>c</em>. 101–103 Ma, with Nain (102.9 ± 0.3 Ma) being <em>c</em>. 1 Ma older than Dehshir (100.9 ± 0.2 Ma; 100.4 ± 0.1 Ma), and that these ophiolites were emplaced almost immediately after
formation (Nain emplacement 101.2 ± 0.2 Ma; Dehshir emplacement 99.0 ± 1.1 Ma). These formation ages are significantly older
than the 98–90 Ma U–Pb zircon ages of other Late Cretaceous ophiolites in this belt such as the Kizildag (Turkey), Semail
(Oman) and Troodos ophiolites (Cyprus). If the subduction initiation model applies to this ophiolite belt, it suggests that
subduction initiation began near the Zagros margin and propagated at <em>c</em>. 7 cm a<sup>−1</sup> to the east (Semail) and <em>c</em>. 15 cm a<sup>−1</sup> to the west (Troodos).
</p>
2016-06-21 11:10:28
Ma
Cretaceous Zagros ophiolites
Nain
ophiolite belt
subduction initiation model
SW
Cretaceous Ophiolite Belt
Geology