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The Tectonic Evolution Of A Neo-Tethyan (Eocene-Oligocene) Island-Arc (Walash And Naopurdan Groups) In The Kurdistan Region Of The Northeast Iraqi Zagros Suture Zone, Sarmad Ali, Solomon Buckman, K Aswad, Brian Jones, Sabah Ismail, Allen Nutman
The Tectonic Evolution Of A Neo-Tethyan (Eocene-Oligocene) Island-Arc (Walash And Naopurdan Groups) In The Kurdistan Region Of The Northeast Iraqi Zagros Suture Zone, Sarmad Ali, Solomon Buckman, K Aswad, Brian Jones, Sabah Ismail, Allen Nutman
B. G. Jones
The Walash and Naopurdan groups are incorporated into the lower allochthonous thrust sheet in the Iraqi Zagros Suture Zone (IZSZ). 40Ar–39Ar dates on magmatic feldspar separates from both Walash and Naopurdan volcanic rocks indicate an Eocene–Oligocene age (43.01 ± 0.15 to 24.31 ± 0.60 Ma). The Walash and Naopurdan groups form a thrust sheet that is structurally overlain by an upper allochthon of Cretaceous arc-related rocks (106–92 Ma) now known as the Hasanbag igneous complex (formerly known as the Gemo–Qandil Group). The Walash and Naopurdan lower allochthon is thrust over the foreland basin Red Beds series. Volcanic and subvolcanic units …
Recognition Of Late Cretaceous Hasanbag Ophiolite-Arc Rocks In The Kurdistan Region Of The Iraqi Zagros Suture Zone: A Missing Link In The Paleogeography Of The Closing Neotethys Ocean, Sarmad Ali, S Buckman, K Aswad, B Jones, S Ismail, A Nutman
Recognition Of Late Cretaceous Hasanbag Ophiolite-Arc Rocks In The Kurdistan Region Of The Iraqi Zagros Suture Zone: A Missing Link In The Paleogeography Of The Closing Neotethys Ocean, Sarmad Ali, S Buckman, K Aswad, B Jones, S Ismail, A Nutman
B. G. Jones
The Hasanbag igneous complex is situated near Sidekan, 100 km northeast of Erbil city, Kurdistan Region, within the Iraqi Zagros suture zone. It forms part of an ophiolite-bearing terrane referred to as the "Upper Allochthon" or Gemo-Qandil Group. The Hasanbag igneous complex consists predominantly of calc-alkaline basaltic andesites to andesites cut by microgabbro and diorite dikes, which previously were interpreted as a part of the Eocene Walash volcanic group. However, 40Ar-39Ar dates on Hasanbag igneous complex kaersutite (magmatic hornblende) indicate an Albian-Cenomanian age (106-92 Ma). This reveals a previously unrecognized portion of the Late Cretaceous, Neotethyan ophiolite-arc complexes in the …