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Document Type |
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Thesis |
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Document Title |
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CONTROLLING FACTORS ON THE FACIES DISTRIBUTION OF THE HOLOCENE COASTAL SEDIMENTS, NORTH AL-WAJH, RED SEA, SAUDI ARABIA العوامل المؤثرة في توزيع سحنات رواسب الهولوسين الساحلية شمال الوجه البحر الحمر-المملكة العربية السعودية |
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Subject |
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Faculty of Marine Sciences |
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Document Language |
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Arabic |
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Abstract |
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The present study concerns with the sedimentology and stratigraphy of the Upper Holocene coastal sediments, North Al-Wajh, Saudi Arabia. The study aims to reconstruct the depositional history and to determine the controlling factors on sedimentation at the mouth of three wadis (Wadi Um Ushsh, Wadi Antar and Wadi Haramel) discharging into the NE Red Sea. Sediments of the five shallow cores (1- 2.2 m long) collected from the intertidal zone at the mouths of these wadis and sedimentary facies, grain size, bulk mineralogy, organic matter and calcium carbonate content were determined. Grain size analysis shows that the sediments of the Dumaygh core contain relatively higher content of poorly sorted gravel compared to thesediments of other coresreflecting the proximity of source area, relatively steep gradient of Wadi Um Ushsh fronting the Dumaygh Lagoon and mixing with coarse skeletal remains. The relatively finer grain size in the Antar and Haramel reflects the near flat to low gradient of substrate sizes of the available sediments and the low depositional hydrodynamics. Four major sedimentary facies characterizing fluvio-marine transition were identified. These facies include lagoonal (A), mud flat deposits (B), upper intertidal sand (C) and bay-fill (D). These facies are arranged vertically in a regressive (progradational) style with lagoonal/bay-fill deposits at the bottom, sharply overlain by fluvially influenced intertidal sand/mud flats.The mineralogical composition consists mainly of detrital siliciclastic minerals dominated with quartz, plagioclase, K-feldspars, clay minerals and traces of amphiboles along with carbonate minerals such as low and high Mg-calcite, dolomite and aragonite. The regressive stacking pattern of sedimentary facies particularly at cores Dumaygh and Antar is interpreted as a result of Late Holocene sea level fall, that is recorded in other areas all over the world. |
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Supervisor |
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Dr. Ibrahim Muhammad Ghandour |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1439 AH
2018 AD |
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Added Date |
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Monday, April 2, 2018 |
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Researchers
| جواد مجيد | Majeed, Jawad | Researcher | Master | |
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