Current library | Call number | Status | Date due | Barcode |
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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)
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