Dating quaternary volcanism and incision by the river Tigris at Diyarbakir, southeast Turkey


BRIDGLAND D. R., Demir T., SEYREK A., PRINGLE M., WESTAWAY R., BIECK A. R., ...More

JOURNAL OF QUATERNARY SCIENCE, vol.22, no.4, pp.387-393, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 22 Issue: 4
  • Publication Date: 2007
  • Doi Number: 10.1002/jqs.1074
  • Journal Name: JOURNAL OF QUATERNARY SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.387-393
  • Keywords: Turkey, Diyarbakir, Tigris, quaternary, Ar-Ar, uplift, incision, WESTERN TURKEY, TERRACE STAIRCASE, REGIONAL UPLIFT, SE TURKEY, CONSTRAINTS, KINEMATICS, ANATOLIA, MOTION, RECORD, MARAS
  • Akdeniz University Affiliated: No

Abstract

New high-precision Ar-Ar dating of basalt underlying the city of Diyarbakir, 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 Karacadag shield volcano complex centred ca. 60 km to the southwest. The reverse-magnetised Diyarbakir basalt, one of relatively few flow units to reach the Tigris valley axis, has been dated to 1196 +/- 19 ka (+/- 2 sigma). Two lower terraces have been recognised in the Diyarbakir area, 46 and 32 m above the present river, with at least one other further downstrearn. 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 (C) 2007 John Wiley & Sons, Ltd.