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Volume 27 Issue 6
Nov.  2016
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Ye Yuan, Timothy M. Kusky, Sankaran Rajendran. Tertiary and Quaternary Marine Terraces and Planation Surfaces of Northern Oman: Interaction of Flexural Bulge Migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes. Journal of Earth Science, 2016, 18(6): 955-970. doi: 10.1007/s12583-015-0656-2
Citation: Ye Yuan, Timothy M. Kusky, Sankaran Rajendran. Tertiary and Quaternary Marine Terraces and Planation Surfaces of Northern Oman: Interaction of Flexural Bulge Migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes. Journal of Earth Science, 2016, 18(6): 955-970. doi: 10.1007/s12583-015-0656-2

Tertiary and Quaternary Marine Terraces and Planation Surfaces of Northern Oman: Interaction of Flexural Bulge Migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes

doi: 10.1007/s12583-015-0656-2
  • Received Date: 2016-12-26
  • Rev Recd Date: 2016-12-26
  • Publish Date: 2016-12-26
  • The northeastern Arabian passive margin is being subducted beneath the Zagros andMakran of Iran. A flexural bulge related to the weight of the Makran has migrated at 4 cm/a throughthe previously uplifted Hajar Mountains of Oman as this active convergence and collision betweenArabia and Eurasia progresses, adding approximately another 500 meters of relief, and forming a series of uplifted marine terraces, alluvial terraces, and planation surfaces that record the passage of thebulge. We use a combination of field studies, remote sensing and GIS to map and better-understandthese terraces, and elucidate how the tectonics of bulge migration, down-to-trench normal faulting,and eustatic sea level changes have interacted to produce the extant geomorphic features on the innerslope of the flexural bulge as it sinks into the foredeep of the Gulf of Oman. We speculate those terraces that were uplifted on the outer slope of the forebulge as it initially migrated through the passivemargin (affected by ophiolite obduction in the Cretaceous) 3.75–7.5 Ma ago are now sinking on the inner slope of the forebulge (corresponding to the outer trench slope in the foredeep), and have beenpartly covered by Quaternary marine terraces related to a Weichselian sea level high stand. Both theTertiary and Quaternary terraces are cut by faults related to the active collision, confirming that thereis a significant risk of moderate earthquakes in the region.
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Tertiary and Quaternary Marine Terraces and Planation Surfaces of Northern Oman: Interaction of Flexural Bulge Migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes

doi: 10.1007/s12583-015-0656-2

Abstract: The northeastern Arabian passive margin is being subducted beneath the Zagros andMakran of Iran. A flexural bulge related to the weight of the Makran has migrated at 4 cm/a throughthe previously uplifted Hajar Mountains of Oman as this active convergence and collision betweenArabia and Eurasia progresses, adding approximately another 500 meters of relief, and forming a series of uplifted marine terraces, alluvial terraces, and planation surfaces that record the passage of thebulge. We use a combination of field studies, remote sensing and GIS to map and better-understandthese terraces, and elucidate how the tectonics of bulge migration, down-to-trench normal faulting,and eustatic sea level changes have interacted to produce the extant geomorphic features on the innerslope of the flexural bulge as it sinks into the foredeep of the Gulf of Oman. We speculate those terraces that were uplifted on the outer slope of the forebulge as it initially migrated through the passivemargin (affected by ophiolite obduction in the Cretaceous) 3.75–7.5 Ma ago are now sinking on the inner slope of the forebulge (corresponding to the outer trench slope in the foredeep), and have beenpartly covered by Quaternary marine terraces related to a Weichselian sea level high stand. Both theTertiary and Quaternary terraces are cut by faults related to the active collision, confirming that thereis a significant risk of moderate earthquakes in the region.

Ye Yuan, Timothy M. Kusky, Sankaran Rajendran. Tertiary and Quaternary Marine Terraces and Planation Surfaces of Northern Oman: Interaction of Flexural Bulge Migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes. Journal of Earth Science, 2016, 18(6): 955-970. doi: 10.1007/s12583-015-0656-2
Citation: Ye Yuan, Timothy M. Kusky, Sankaran Rajendran. Tertiary and Quaternary Marine Terraces and Planation Surfaces of Northern Oman: Interaction of Flexural Bulge Migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes. Journal of Earth Science, 2016, 18(6): 955-970. doi: 10.1007/s12583-015-0656-2

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