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The River Orontes in Syria and Turkey: downstream variation of fluvial archives in different crustal blocks

The River Orontes in Syria and Turkey: downstream variation of fluvial archives in different crustal blocks
The River Orontes in Syria and Turkey: downstream variation of fluvial archives in different crustal blocks
The geomorphology and Quaternary history of the River Orontes in western Syria and south-central Turkey have been studied using a combination of methods: field survey, differential GPS, satellite imagery, analysis of sediments to determine provenance, flow direction and fluvial environment, incorporation of evidence from fossils for both palaeoenvironments and biostratigraphy, uranium-series dating of calcrete cement, reconciliation of Palaeolithic archaeological contents, and uplift modelling based on terrace height distribution. The results underline the contrasting nature of different reaches of the Orontes, in part reflecting different crustal blocks, with different histories of landscape evolution. Upstream from Homs the Orontes has a system of calcreted terraces that form a staircase extending to ~200 m above the river. New U-series dating provides an age constraint within the lower part of the sequence that suggests underestimation of terrace ages in previous reviews. This upper valley is separated from another terraced reach, in the Middle Orontes, by a gorge cut through the Late Miocene–Early Pliocene Homs Basalt. The Middle Orontes terraces have long been recognized as a source of mammalian fossils and Palaeolithic artefacts, particularly from Latamneh, near the downstream end of the reach. This terraced section of the valley ends at a fault scarp, marking the edge of the subsiding Ghab Basin (a segment of the Dead Sea Fault Zone), which has been filled to a depth of ~ 1 km by dominantly lacustrine sediments of Pliocene–Quaternary age. Review of the fauna from Latamneh suggests that its age is 1.2–0.9 Ma, significantly older than previously supposed, and commensurate with less uplift in this reach than both the Upper and Lower Orontes. Two localities near the downstream end of the Ghab have provided molluscan and ostracod assemblages that record somewhat saline environments, perhaps caused by desiccation within the former lacustrine basin, although they include fluvial elements. The Ghab is separated from another subsiding and formerly lacustrine depocentre, the Amik Basin of Hatay Province, Turkey, by a second gorge, implicit of uplift, this time cut through Palaeogene limestone. The NE–SW oriented lowermost reach of the Orontes is again terraced, with a third and most dramatic gorge through the northern edge of the Ziyaret Da?? mountains, which are known to have experienced rapid uplift, probably again enhanced by movement on an active fault. Indeed, a conclusion of the research, in which these various reaches are compared, is that the crust in the Hatay region is significantly more dynamic than that further upstream, where uplift has been less rapid and less continuous.
0169-555X
29-45
Bridgland, David
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Westaway, Rob
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Abou Romieh, Mohammad Abou
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Candy, Ian
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Daoud, Mohamad
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Demir, Tuncer
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Galiatsatos, Nikolaos
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Schreve, Danielle
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Seyrek, Ali
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Shaw, Andrew
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White, Tom
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Whittaker, John
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Bridgland, David
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Westaway, Rob
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Abou Romieh, Mohammad Abou
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Candy, Ian
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Daoud, Mohamad
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Demir, Tuncer
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Galiatsatos, Nikolaos
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Schreve, Danielle
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Seyrek, Ali
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Shaw, Andrew
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White, Tom
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Whittaker, John
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Bridgland, David, Westaway, Rob, Abou Romieh, Mohammad Abou, Candy, Ian, Daoud, Mohamad, Demir, Tuncer, Galiatsatos, Nikolaos, Schreve, Danielle, Seyrek, Ali, Shaw, Andrew, White, Tom and Whittaker, John (2012) The River Orontes in Syria and Turkey: downstream variation of fluvial archives in different crustal blocks. [in special issue: Techniques for analysing Late Cenozoic river terrace sequences] Geomorphology, 165-166, 29-45. (doi:10.1016/j.geomorph.2012.01.011).

Record type: Article

Abstract

The geomorphology and Quaternary history of the River Orontes in western Syria and south-central Turkey have been studied using a combination of methods: field survey, differential GPS, satellite imagery, analysis of sediments to determine provenance, flow direction and fluvial environment, incorporation of evidence from fossils for both palaeoenvironments and biostratigraphy, uranium-series dating of calcrete cement, reconciliation of Palaeolithic archaeological contents, and uplift modelling based on terrace height distribution. The results underline the contrasting nature of different reaches of the Orontes, in part reflecting different crustal blocks, with different histories of landscape evolution. Upstream from Homs the Orontes has a system of calcreted terraces that form a staircase extending to ~200 m above the river. New U-series dating provides an age constraint within the lower part of the sequence that suggests underestimation of terrace ages in previous reviews. This upper valley is separated from another terraced reach, in the Middle Orontes, by a gorge cut through the Late Miocene–Early Pliocene Homs Basalt. The Middle Orontes terraces have long been recognized as a source of mammalian fossils and Palaeolithic artefacts, particularly from Latamneh, near the downstream end of the reach. This terraced section of the valley ends at a fault scarp, marking the edge of the subsiding Ghab Basin (a segment of the Dead Sea Fault Zone), which has been filled to a depth of ~ 1 km by dominantly lacustrine sediments of Pliocene–Quaternary age. Review of the fauna from Latamneh suggests that its age is 1.2–0.9 Ma, significantly older than previously supposed, and commensurate with less uplift in this reach than both the Upper and Lower Orontes. Two localities near the downstream end of the Ghab have provided molluscan and ostracod assemblages that record somewhat saline environments, perhaps caused by desiccation within the former lacustrine basin, although they include fluvial elements. The Ghab is separated from another subsiding and formerly lacustrine depocentre, the Amik Basin of Hatay Province, Turkey, by a second gorge, implicit of uplift, this time cut through Palaeogene limestone. The NE–SW oriented lowermost reach of the Orontes is again terraced, with a third and most dramatic gorge through the northern edge of the Ziyaret Da?? mountains, which are known to have experienced rapid uplift, probably again enhanced by movement on an active fault. Indeed, a conclusion of the research, in which these various reaches are compared, is that the crust in the Hatay region is significantly more dynamic than that further upstream, where uplift has been less rapid and less continuous.

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Accepted/In Press date: 17 January 2012
e-pub ahead of print date: 24 January 2012
Published date: 1 September 2012
Organisations: Archaeology

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Local EPrints ID: 403445
URI: https://eprints.soton.ac.uk/id/eprint/403445
ISSN: 0169-555X
PURE UUID: 790955eb-2361-4d3a-a33f-eb92fae1c6ca

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Date deposited: 02 Dec 2016 16:36
Last modified: 04 Nov 2019 19:29

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Contributors

Author: David Bridgland
Author: Rob Westaway
Author: Mohammad Abou Abou Romieh
Author: Ian Candy
Author: Mohamad Daoud
Author: Tuncer Demir
Author: Nikolaos Galiatsatos
Author: Danielle Schreve
Author: Ali Seyrek
Author: Andrew Shaw
Author: Tom White
Author: John Whittaker

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