site du réseau Frantiq
Normal view MARC view

Dating Quaternary volcanism and incision by the River Tigris at Diyarbakir, southeast Turkey [Extrait] / David R. Bridgland,Tuncer Demi̇r, Ali̇ Seyrek, Malcolm Pringle, Rob Westaway, Anthony R. Beck1, George Rowbotham, Sema Yurtmen

Publication : 2007 In : Journal of Quaternary Science, 22, 4, p. 387-393Langue : Anglais. Auteur principal: Bridgland, David R Co-auteur: Demir, Tuncer ; Seyrek, Ali ; Pringle, Malcolm ; Westaway, Rob ; Beck, Anthony ; Rowbotham, George ; Yurtmen, SemaRésumé : New high-precision Ar-Ar dating of basalt underlying the city of Diyarbakır, southeast Turkey, constrains the Quaternary incision history of the River Tigris, strengthening the pre-existing chronology based on magnetostratigraphy and K-Ar dates. The basalt, which overlies Tigris terrace gravel 70 m above the river, is part of the Karacadağ shield volcano complex centred ca. 60 km to the southwest. The reverse-magnetised Diyarbakır basalt, one of relatively few flow units to reach the Tigris valley axis, has been dated to 1196 ± 19 ka (±2σ). Two lower terraces have been recognised in the Diyarbakır area, 46 and 32 m above the present river, with at least one other further downstream. From this evidence the rate of Middle-Late Pleistocene incision by the Tigris can be estimated; it probably reached ca. 0.07 mm a−1, reflecting the characteristic global increase in uplift rates observed at that time.(Revue).Lieux:Turquie -- Diyarbakir
Current location Call number Status Date due Barcode
Nanterre : MSH Mondes - Paléorient - Préhistoire et Protohistoire orientales
Non consultable PAOR3273

New high-precision Ar-Ar dating of basalt underlying the city of Diyarbakır, southeast Turkey, constrains the Quaternary incision history of the River Tigris, strengthening the pre-existing chronology based on magnetostratigraphy and K-Ar dates. The basalt, which overlies Tigris terrace gravel 70 m above the river, is part of the Karacadağ shield volcano complex centred ca. 60 km to the southwest. The reverse-magnetised Diyarbakır basalt, one of relatively few flow units to reach the Tigris valley axis, has been dated to 1196 ± 19 ka (±2σ). Two lower terraces have been recognised in the Diyarbakır area, 46 and 32 m above the present river, with at least one other further downstream. From this evidence the rate of Middle-Late Pleistocene incision by the Tigris can be estimated; it probably reached ca. 0.07 mm a−1, reflecting the characteristic global increase in uplift rates observed at that time.(Revue)

There are no comments for this item.

to post a comment.