TECTONIC AND SEDIMENTARY EVOLUTION OF THE CENOZOIC HATAY GRABEN, SOUTHERN TURKEY: A TWO-PHASE MODEL FOR GRABEN FORMATION
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TECTONIC AND SEDIMENTARY EVOLUTION OF THE CENOZOIC HATAY GRABEN, SOUTHERN TURKEY: A TWO-PHASE MODEL FOR GRABEN FORMATION
Boulton S.J.; Robertson A.H.F.; Ünlügenç U.C.
xmlui.dri2xhtml.METS-1.0.item-citation:
Geological Society Special Publication, 2006, 260, 260. С. 6, 613-634
Date:
2006
Abstract:
New structural and sedimentary studies form the basis of a new interpretation for the Neogene Hatay Graben. Fault analysis reveals three contemporaneous trends of fault orientation (000°-180°, 045°-225° and 150°-350°) suggesting that the graben is transtensional in nature. Sedimentary studies show that, following shallow-marine deposition from the Late Cretaceous to the Eocene, a hiatus ensued until Early Miocene fluvial sedimentation. After a Mid-Miocene marine transgression, water depths increased until the Messinian salinity crisis, followed by a regression from the Pliocene to the present day. The basin initially developed as the distal margin of a foreland basin of the Tauride allochthon to the north, developing a classic sedimentary sequence during Mid-Late Miocene. Stresses caused by loading of the crust created a flexural forebulge to the south that supplied sediment mainly northwards. During the Plio-Quaternary, transtensional graben development took place, primarily influenced by the westward tectonic escape of Anatolia along the East Anatolia Fault Zone and left-lateral offset along the northward extension of the Dead Sea Transform Fault. This area is, thus, an excellent example of a foreland basin reactivated in a strike-slip setting. Our new two-phase model: foreland basin, then transtensional basin for the Hatay Graben, is in contrast to previous models, in which it was generally assumed that the Plio-Quaternary Hatay Graben represents a direct extension of the Dead Sea Fault Zone or the East Anatolian Fault Zone. © The Geological Society of London 2006.
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