Lagoon Sediments of the Eastern Red Sea: Distribution Processes, Pathways and Patterns

Rasul, Najeeb M. A.

doi:10.1007/978-3-662-45201-1_17

Cited by 20 publications

(18 citation statements)

References 46 publications

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“…The western side of the lagoon is bordered by old, raised coral reef terraces (1-3 m high); probably of Pleistocene age [21,22]. Rainwaters rarely drain into the lagoon through the generally inactive Wadi Al-Atwa, Wadi Al-Kharqah and unknown wadi during the sporadic major floods [6]. The composition and the grain size of bottom sediments vary widely in the lagoon.…”

Section: Area Of Studymentioning

confidence: 99%

“…The lagoons have a semidiurnal low tidal range about 0.3 m that is similar to that of the central Red Sea [24]. The energy flux generated by wind-generated waves and currents along with tidal currents control the sediment transportation at the entrance of the lagoon [6,25]. The water circulation between the lagoons and Red Sea is of reversal estuarine type.…”

Section: Climatementioning

confidence: 99%

“…Earlier studies [6,16] suggested that the bottom of the SHL experiences stagnation and anoxic conditions particularly in areas that are enriched in organic matter. They attributed the stagnant conditions to the limited water exchange with the Red Sea and the hypersalinity because of arid climate.…”

Section: Lagoonal Bottom Conditionsmentioning

confidence: 99%

“…There are over twenty elongated and shallow lagoons locally known as sharms and/or Khawrs extending along the Saudi the Red Sea coast [6]. These lagoons have gently sloping shorelines and connect to the Red Sea through one or more inlets.…”

Section: Introductionmentioning

confidence: 99%

“…The existence and evolution of Red Sea coastal lagoons are related either to the rise of sea level (RSL) during the Holocene [7] or as remnants of collapse features formed by selective dissolution of Miocene evaporites [8]. The description of the sedimentological characteristics and the composition of bottom sediments of major Red Sea coastal lagoons were reviewed by Rasul [6]. The extreme arid climate with a very limited and negligible annual rainfall and therefore, the composition of the lagoon bottom sediments are dominantly of autochthonous biogenic sediments.…”

Section: Introductionmentioning

confidence: 99%

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Controlling factors on the geochemistry of Al-Shuaiba and Al-Mejarma coastal lagoons, Red Sea, Saudi Arabia

Basaham¹,

Ghandour²,

Haredy³

2019

Open Geosciences

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Geochemical and mineralogical analyses of bottom sediments collected from Al-Shuaiba (SHL) and Al-Mejarma (MJL) coastal lagoons, Red Sea were carried out. Mineralogically, the sediments consist mainly of carbonate minerals particularly aragonite, high and low Mg-calcite and traces of dolomite admixed with non-carbonate minerals including quartz, k-feldspars, plagioclase and traces of amphiboles, mica and clay minerals. The spatial distribution of major and trace elements at the bottom of the lagoons indicates two groups of elements. The first, less significant, is of terrigenous origin concentrates mainly in the shoreward direction. This group includes the silicates (Al2O3-Fe2O3-SiO2), Feldspars (K2O-Rb-Ba) and heavy minerals (V-Cr-Zr, TiO2-Y-Nb) related elements. The second most dominant group is the carbonate related elements (CaO-Sr) that concentrates in the seaward direction. The two lagoons are not affected by urbanization or anthropogenic impact, and hence the siliciclastic elements are related to the terrigenous influx mainly by aeolian transportation. The carbonate related elements are mainly of biogenic origin related to calcareous skeletal remains. The elemental distribution in the bottom sediments of the MJL is more homogeneous than those in the SHL reflecting the bottom conditions that are mainly controlled by lagoon morphology, hydrodynamic and the water circulation between the lagoon and the sea. Geochemical data show no obvious enrichment of Al-normalized redox-sensitive trace elements V and Cr suggesting that there is no variation in the bottom redox conditions in contrast with other previous studies. The information in this work is an important tool for biogeochemical and biological research projects in the Red Sea coastal lagoons.

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Section: Area Of Studymentioning

confidence: 99%

Section: Climatementioning

confidence: 99%

Section: Lagoonal Bottom Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Controlling factors on the geochemistry of Al-Shuaiba and Al-Mejarma coastal lagoons, Red Sea, Saudi Arabia

Basaham¹,

Ghandour²,

Haredy³

2019

Open Geosciences

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The Spatial Distribution Pattern of Surficial Sediment in Shiab Al-Kabeer, a Shoal in the Red Sea of Saudi Arabia

Rasul

Al-Qutub

2018

Geological Setting, Palaeoenvironment and Archaeology of the Red Sea

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Distribution and Sources of Hydrocarbon Compounds in Sediments from Obhur Lagoon: Red Sea Coast of Saudi Arabia

Rushdi

Rasul

Bazeyad

et al. 2018

Springer Oceanography

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Surface sediment samples from Obhur Lagoon on the Red Sea coast of Saudi Arabia were collected and analyzed to determine the levels, distribution and sources of hydrocarbon compounds. The sediments were collected using a Van Veen grab sampler, dried, extracted with a mixture of dichloromethane/methanol, and analyzed by gas chromatography-mass spectrometry. The major hydrocarbons of these lipid extracts included n-alkanes (6-645 ng g −1 ), methyl n-alkanoates (1-311 ng g −1 ), hopanes (3-219 ng g −1 ), steranes (5-258 ng g −1 ), phthalates (4-201 ng g −1 ), and an unresolved complex mixture (UCM) (0-4571 lg g −1 ). Anthropogenic petroleum products and plasticizers were the main sources of these hydrocarbons, with lesser amounts from biogenic sources, including natural waxes of terrestrial higher plants and marine microbial detritus. The estimated anthropogenic inputs of the total lipid hydrocarbons for all sediments ranged from 14 to 98% for petroleum products and from 2 to 18% for plasticizers, whereas biogenic inputs ranged from 0 to 10.7% for terrestrial higher plant waxes and from 0 to 68.5% for marine microbial detritus. The presence and inputs of petroleum residues and plasticizers to the coastal sediments of the lagoon likely affect the marine ecosystems and associated species groups that use the lagoon as a coastal nursery and spawning area.

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Lagoon Sediments of the Eastern Red Sea: Distribution Processes, Pathways and Patterns

Cited by 20 publications

References 46 publications

Controlling factors on the geochemistry of Al-Shuaiba and Al-Mejarma coastal lagoons, Red Sea, Saudi Arabia

Controlling factors on the geochemistry of Al-Shuaiba and Al-Mejarma coastal lagoons, Red Sea, Saudi Arabia

The Spatial Distribution Pattern of Surficial Sediment in Shiab Al-Kabeer, a Shoal in the Red Sea of Saudi Arabia

Distribution and Sources of Hydrocarbon Compounds in Sediments from Obhur Lagoon: Red Sea Coast of Saudi Arabia

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