The Cimmerian Orogeny in northern Iran: tectono‐stratigraphic evidence from the foreland

Terra Nova - Tập 21 Số 3 - Trang 211-218 - 2009
Markus Wilmsen1, Franz T. Fürsich2, Kazem Seyed–Emami3, Mahmoud Reza Majidifard4, Jafar Taheri5
1Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Sektion Paläozoologie, Königsbrücker Landstr. 159, D‐01109 Dresden, Germany
2GeoZentrum Nordbayern, Fachgruppe PaläoUmwelt, Friedrich‐Alexander‐Universität Erlangen‐Nürnberg, Loewenichstr. 28, D‐91054 Erlangen, Germany
3School of Mining Engineering, University College of Engineering, University of Tehran, PO Box 11365‐4563, Tehran, Iran
4Geological Survey of Iran, Box 131851‐1494, Tehran, Iran
5Geological Survey of Iran, NE Branch, PO Box 91735‐1166, Mashad, Iran

Tóm tắt

AbstractFrom the Permian onwards, the Gondwana‐derived Iran Plate drifted northward to collide with Eurasia in the Late Triassic, thereby closing the Palaeotethys. This Eo‐Cimmerian Orogeny formed the Cimmeride fold‐and‐thrust belt. The Upper Triassic–Middle Jurassic Shemshak Group of northern Iran is commonly regarded as the Cimmerian foreland molasse. However, our tectono‐stratigraphic analysis of the Shemshak Group resulted in a revised and precisely dated model for the Triassic–Jurassic geodynamic evolution of the Iran Plate: initial Cimmerian collision started in the Carnian with subsequent Late Triassic synorogenic peripheral foreland deposition (flysch, lower Shemshak Group). Subduction shifted south in the Norian (onset of Neotethys subduction below Iran) and slab break‐off around the Triassic–Jurassic boundary caused rapid uplift of the Cimmerides followed by Liassic post‐orogenic molasse (middle Shemshak Group). During the Toarcian–Aalenian (upper Shemshak Group), Neotethys back‐arc rifting formed a deep‐marine basin, which developed into the oceanic South Caspian Basin during the Late Bajocian–Late Jurassic.

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Terra Nova

Tập 21 Số 3

211-218

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