New data on the tectonic evolution of the Khoy region, NW Iran

Avagyan, Ara, Shahidi, Alireza, Sosson, Marc, Sahakyan, Lilit, Galoyan, Ghazar, Muller, Carla, Vardanyan, Sargis, Bahar Firouzi, Khalil, Bosch, Delphine, Danelian, Taniel, Asatryan, Gayane, Mkrtchyan, Mushegh and Ali Shokri, Mohammad (2017). New data on the tectonic evolution of the Khoy region, NW Iran. In M. Sosson, R. A. Stephenson and S. A. Adamia (Ed.), Tectonic Evolution of the Eastern Black Sea and Caucasus (pp. 1-18) London, United Kingdom: Geological Society. doi:10.1144/SP428.13


Author Avagyan, Ara
Shahidi, Alireza
Sosson, Marc
Sahakyan, Lilit
Galoyan, Ghazar
Muller, Carla
Vardanyan, Sargis
Bahar Firouzi, Khalil
Bosch, Delphine
Danelian, Taniel
Asatryan, Gayane
Mkrtchyan, Mushegh
Ali Shokri, Mohammad
Title of chapter New data on the tectonic evolution of the Khoy region, NW Iran
Title of book Tectonic Evolution of the Eastern Black Sea and Caucasus
Place of Publication London, United Kingdom
Publisher Geological Society
Publication Year 2017
Sub-type Research book chapter (original research)
DOI 10.1144/SP428.13
Open Access Status Not yet assessed
Series Geological Society Special Publications
ISBN 9781862397392
Editor M. Sosson
R. A. Stephenson
S. A. Adamia
Volume number 428
Chapter number 3
Start page 1
End page 18
Total pages 18
Total chapters 16
Language eng
Abstract/Summary The Khoy region (NW Iran) is important in the clarification of the structural framework of the alpine belt between the Taurides, the Lesser Caucasus and the NW Iran belt. The area is wellknown for these ophiolitic units. We present here new stratigraphic and structural data that can be used to reconstruct the tectonic evolution of this region and then try to establish connections between these belts. According to new dates from nannoplankton assemblages, the obducted ophiolite of the Khoy complex was thrust over a sheared Campanian olistostrome and lenses of amphibolite are included within the contact. The obduction event is also marked by erosion of the ophiolitic unit and the deposition of conglomerates, shales, sandstones and siltstones. Poorly extended Paleocene detrital deposits cover the Campanian–Maastrichtian rocks. The Eocene formations characterize a basin filled with volcanogenic and sedimentary layers. The Middle and Upper Eocene series unconformably overlie the ophiolites and their cover of Campanian–Maastrichtian and Paleocene deposits. This corresponds to a syn orogenic basin formed after the collision between Eurasia and the Taurides Anatolides–South Armenian microplate. The Oligocene–Miocene Qom Formation with basal conglomerates unconformably covers all the earlier formations, including the Palaeozoic formations, indicating intense shortening before its deposition. Compressional deformation continued and is manifested by numerous folds, mainly west-dipping thrusts and reverse faults cutting the Qom Formation, and by recent NW–SE dextral strike-slip faults. This illustrates the continuous shortening and uplift (with intense erosion) resulting from the advanced stage of the collision between Arabia and Eurasia. The structural location of the tectonic units suggests that the Khoy Gondwana-related basement was part of the South Armenian Block and that the Khoy allochthonous ophiolites were obducted on it from the Amasia–Stepanavan –Sevan–Hakari suture zone.
Q-Index Code B1
Q-Index Status Provisional Code
Institutional Status Non-UQ

 
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Created: Mon, 11 Apr 2016, 22:29:45 EST by Gayane Asatryan on behalf of School of Geography, Planning & Env Management