Aeolian Admixtures in the Sediments of the Northern Persian Gulf

Kukal, Zdeněk; Saadallah, Adnan A.

doi:10.1007/978-3-642-65545-6_7

Cited by 29 publications

(17 citation statements)

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“…Silt-sized quartz, trapped within microbial mats, is common in modern tidal flats of the Persian Gulf. Winds are the major transport agent (Kukal and Saadallah, 1973).…”

Section: Zonda Formationmentioning

confidence: 99%

Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America

Keller¹

1999

Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America

143

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The Argentine Precordillera ("Precordillera") is part of a larger terrane which is exotic to the western margin of Gondwana. This larger terrane is characterized by a Grenvillian-type basement and the presence of Laurentian carbonate-platform rocks of Cambrian-Ordovician age. The original position of the terrane is interpreted to be the Ouachita embayment of southeastern Laurentia.Terminal Neoproterozoic continental breakup and the formation of the Appalachian-Ouachita margin during the late Precambrian-Early Cambrian established a passive margin to the present east of the Precordillera. This passive margin is the original continental margin of Laurentia, which was located outboard of the Precordillera. Continuous crustal extension during the Cambrian along the Ouachita margin created a marginal plateau that accommodated the Argentine Precordillera carbonate platform. This marginal plateau to Laurentia was separated from mainland Laurentia by a deep graben system, today represented by the offshore Ouachita facies of the southeastern United States. The Cambrian through earliest Middle Ordovician mark the climax of the Laurentian episode because the Argentine Precordillera sediments and fauna are indistinguishible from Laurentia.In the carbonate platform succession of the Argentine Precordillera, the La Laja Formation marks the transition from rift-related redbeds to carbonate sedimentation. The La Laja Formation was deposited on a platform seaward of the nearshore siliciclastic trap but inboard of a (only partly exposed) carbonate belt which might have marked the platform margin. Several third-order cycles developed; differential rates of sea-level rise were the driving forces for cycle formation. Near the base of the La Laja Formation, a sandy interval is separated from the older rocks by a presumed hiatus. This hiatus might represent the Hawke Bay regression event of the eastern margin of Laurentia. Upper Cambrian limestones and dolostones of the Zonda and La Flecha Formations record the evolution of vast peritidal flats. The spatial and biostratigraphical relations between both formations are not clear and await further research. At present, it seems that the lower, more calcareous facies of the La Flecha Formation in the Guandacol subbasin is coeval to the dolomite facies of the Zonda Formation in the San Juan subbasin. The last important terrigenous input is noticed inMarjuman sediments of the La Flecha Formation, which marks a major shift in coastal onlap toward the hinterland. The Tremadocian La Silla Formation reflects a somewhat deeper environment, although open-marine rocks are absent. However, extensive tidal flats are also absent. The rocks are mud-dominated limestones and dolostones with locally abundant oolites. 1 Geological Society of America Special Paper 341 1999 on July 16, 2015 specialpapers.gsapubs.org Downloaded from Small-scale cycles are locally present. The general arrangement of facies is best explained by a tidal-flat island model. The La Silla Formation shows the most uniform facies deve...

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“…Silt-sized quartz, trapped within microbial mats, is common in modern tidal flats of the Persian Gulf. Winds are the major transport agent (Kukal and Saadallah, 1973).…”

Section: Zonda Formationmentioning

confidence: 99%

Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America

Keller¹

1999

Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America

143

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“…The detrital dolomite in the Arabian Gulf sediments is believed to be the result of wind blown transport of dust material (Emery 1956;Sugden 1963;Pilkey and Noble 1966;Kukal and Saadallah 1973;Khalaf and Ala 1980;Khalaf et al 1982). A preliminary examination of dust fallout collected from stations close to Khawr Az-Zubair-Umm Qasr Bay shows that dustfall deposits are composed of 80 per cent of calcareous silt which contains on average 6 per cent dolomite.…”

Section: Mineralogical Compositionmentioning

confidence: 97%

Sediments in the estuarine environment of the tigris/euphrates delta; Iraq; Arabian Gulf

Darmoian

Lindqvist

1988

Geological Journal

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Carbonates, quartz, feldspar, and halite are the main mineral constituents of the non-clay grade sediments; carbonates are present mainly as low-magnesium calcite followed by dolomite and high-magnesium calcite. Aragonite is present only in trace amounts. Both detrital and biogenic sources are suggested for low-magnesium calcite. A detrital source for dolomite and a biogenic source for high-magnesium calcite and aragonite are proposed.KEY WORDS Arabian Gulf Iraq Estuarine sediments Sedimentology Organic matter in sediments arbonate minerals

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“…The only previous report on evaporite-cemented eolian dust aggregates is from coastal Iraq where "pseudo-sands" were described in which "gypsum may also occur as a cementing material" [9]. Evaporite-cemented aggregates from eolian verY fine and fine sand were reported from a sebkha within the coastal dunefield near Mambrui, Kenya [10]; in this case ag" gregates were cemented by halite, gypsum, and other leSS soluble minerals, and sequences of two or three cementi~ minerals have been observed.…”

Section: Aggregatesmentioning

confidence: 98%

Eolian dust in the coastal desert of the sudan: Aggregates cemented by evaporites

1984

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Eolian dusts collected after dust storms contain aggregates that are cesmutted by evaporitic salts, mainly halite. They vary in shape, fabrics, and t,:~ ace roughness Aggregation changes grainshape density and size dis--uuti0n ,c ~ ' ' . tran ,,, aust particles (i.e., characteristics determining erosion and inteSp°rt); on deposition in the sea, cements dissolve and aggregates disra:_ grate, leaving the resultant eolo-marine sediment component with a fr~eadlng paleo-climatic record. The eolian transport of salts with dust m the arid coastal plain to the sea constitutes a portion of anticyclic salt movement and probably plays a role in the geochemical balance of the OCeans.

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Aeolian Admixtures in the Sediments of the Northern Persian Gulf

Cited by 29 publications

References 0 publications

Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America

Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America

Sediments in the estuarine environment of the tigris/euphrates delta; Iraq; Arabian Gulf

Eolian dust in the coastal desert of the sudan: Aggregates cemented by evaporites

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