Mixed siliciclastic-carbonate-evaporite sedimentation in an arid eolian landscape: The Khor Al Adaid tide-dominated coastal embayment, Qatar
| Autor: | John M. Rivers, Sabrina L. Skeat, Robert W. Dalrymple, Ruqaiya Yousif, Josh D. Butler, Christopher Warren, Ekhlas M.M. Abdel Bari, Ismail Al-Shaikh |
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| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
Marine Evaporite Arid Stratigraphy Fluvial Geology Lagoon 010502 geochemistry & geophysics 01 natural sciences Thalweg Sedimentary depositional environment Oceanography Benthic zone Estuarine water circulation Eolian Siliciclastic Sedimentology Qatar 0105 earth and related environmental sciences |
| Zdroj: | Sedimentary Geology. 408:105730 |
| ISSN: | 0037-0738 |
| DOI: | 10.1016/j.sedgeo.2020.105730 |
| Popis: | The Khor Al Adaid embayment of southern Qatar represents a unique shallow-water mixed siliciclastic‑carbonate coastal depositional system that developed in a hyper-arid climatic setting over the past 6000 years. The embayment, which was formed during the Flandrian transgression as a result of flooding across a partially fault-controlled incised fluvial drainage, is supplied by quartz-rich sands delivered by wind-blown dunes migrating southward across the surface of Qatar. These offshore-migrating eolian-derived sediments are being redistributed by tidal currents in an otherwise low-energy coastal zone, where in situ formation of carbonate mud and a low-diversity skeletal assemblage is ongoing within salinity-restricted environments. Three depositional sectors are delineated: 1) an energetic, linear, fault-controlled Entrance Channel into which the eolian dunes spill directly; 2) a relatively deep (up to 20 m) Outer Lagoon, interpreted to represent a flooded karst-collapse structure; and 3) a sprawling, low-energy, shallow ( |
| Databáze: | OpenAIRE |
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