angular unconformities between Cretaceous andTertiary in Kurdistan Region, NE-Iiraq

 

Geol. Mag. 148 (5–6), 2011, pp. 925–939._ Cambridge University Press 2011. The online version of this article is published within an Open Access

environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/

licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.
doi:10.1017/S0016756811000471

Significance of angular unconformities between Cretaceous andTertiary strata in the northwestern segment of the Zagros fold–thrust belt, Kurdistan Region, NE Iraq

 

KAMAL H. KARIM*    HEMIN KOYI‡†,,  MUSHIR M. BAZIANY* & KHALED HESSAMI§

 

*Department of Geology, College of Science, University of Sulaimani, Sulaimani, Kurdistan Region, Iraq

‡Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Uppsala, Sweden

§International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

(Received 10 November 2010; accepted 3 May 2011; first published online 8 July 2011)

 Published in: Geological Magazine  (journal of  Cambridge University) vol.148 (5–6), 2011, pp. 925–939

 

Abstract – In this study, two angular unconformities are found and analysed for the first time in the Mesozoic–Cenozoic succession in the northwestern segment of the Zagros fold–thrust belt (ZFTB) in the Kurdistan Region. The first unconformity exists between Lower Cretaceous and Paleocene– Eocene rocks and the second between the Campanian Shiranish Formation and the Maastrichtian Tanjero Formation. Each of these unconformities is found in two different localities in the Zagros Imbricate Zone (i.e. the highly deformed zone immediately SW of the Zagros Suture) of the ZFTB of the Kurdistan Region near the border with Iran. The study uses recent geological mapping, structural and stratigraphic analyses in addition to using previous biozonation of the stratigraphic units that bound the two unconformities. The first unconformity was initiated with obduction of the ophiolite and Lower Cretaceous radiolarite onto the passive margin of the Arabian plate. This unconformity formed during an early phase of the Zagros orogeny, which is associated with the developing of a foreland basin, and resulted in the folding of the radiolarites and their uplift to form high-relief land. The erosion of this high-relief land resulted in the formation of the Paleocene–Eocene Red Bed Series and their deposition on the folded radiolarite. The timing of the deformation that caused this nconformity is hard to determine; however, its stratigraphic position may suggest that it possibly is related to post-Cenomanian movements. The second unconformity is between the tilted Campanian Shiranish Formation (hemipelagite) and Tanjero Formation (500 m of conglomerate in the more proximal area). These unconformities indicate that deformation and uplift of the sedimentary units was variable during ophiolite obduction in this part of the ZFTB. We argue that deformation, ophiolite obduction and collision are likely to have varied in space and time along the c. 2000 km long ZFTB. Keywords: angular unconformity, Zagros fold–thrust belt, Kurdistan Region, obduction, Tanjero Formation, Red Bed Series, Qulqula Radiolarian Formation.

For  full text open this link: http://journals.cambridge.org/action/displayFulltext?type=1&fid=8348276&jid=GEO&volumeId=148&issueId=5-6&aid=8348274

Post Author: Professor Kamal Haji Karim

Professor at Department of Geology, University of Sulaimani, Kurdistan Region, Iraq

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