Dating Quaternary volcanism and incision by the River Tigris at Diyarbakır,southeast Turkey |
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| Authors: | David R Bridgland Tuncer Demi?r Ali? Seyrek Malcolm Pringle Rob Westaway Anthony R Beck George Rowbotham Sema Yurtmen |
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| Institution: | 1. Department of Geography, Durham University, Durham, UK;2. Department of Geography, Harran University, ?anl?urfa, Turkey;3. Department of Soil Science, Harran University, ?anl?urfa, Turkey;4. Scottish Universities' Environmental Research Centre, East Kilbride, Scotland, UK;5. Faculty of Mathematics and Computing, The Open University, Gosforth, Newcastle upon Tyne, UK;6. School of Earth Sciences and Geography, Keele University, Keele, Staffordshire, UK;7. Department of Geology, ?ukurova University, Adana, Turkey |
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| Abstract: | New high‐precision Ar‐Ar dating of basalt underlying the city of Diyarbak?r, 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 Karacada? shield volcano complex centred ca. 60 km to the southwest. The reverse‐magnetised Diyarbak?r 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 Diyarbak?r 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. Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | Turkey Diyarbakı r Tigris Quaternary Ar‐Ar uplift incision |
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