scholarly journals Erosion‐initiated stromatolite and thrombolite formation in a present‐day coastal sabkha setting

Sedimentology ◽  
2020 ◽  
Vol 68 (1) ◽  
pp. 382-401
Author(s):  
Andreas Paul ◽  
Stephen W. Lokier ◽  
Angela Sherry ◽  
Luiza Lessa Andrade ◽  
Wesley M. Court ◽  
...  
Keyword(s):  
Coastal Sabkha

Formation of Diagenetic Dolomite in Coastal Sabkha Along Arabian (Persian) Gulf

AAPG Bulletin ◽  
1982 ◽  
Vol 66 ◽  
Author(s):  
R. J. Patterson (2), D. J. J. Kinsm
Keyword(s):  
Persian Gulf ◽  
Coastal Sabkha

Sedimentology and Evolution of the Fluvial-Deltaic System: A Modern Depositional Model Analog from the Red Sea Coastal Region, Saudi Arabia

2021 ◽  
Author(s):  
Osman Abdullatif ◽  
Mutasim Osman ◽  
Mazin Bashri ◽  
Ammar Abdlmutalib ◽  
Mohamed Yassin
Keyword(s):  
Red Sea ◽  
Coastal Plain ◽  
Depositional Environments ◽  
Hydrocarbon Reservoirs ◽  
Sediment Supply ◽  
Arabian Shield ◽  
Space And Time ◽  
Groundwater Aquifers ◽  
Coastal Sabkha ◽  
Lithofacies Association

Abstract Siliciclastic sediments represent important lithological unit of the Red Sea coastal plain. Their subsurface equivalents are important targets of groundwater aquifer and hydrocarbon reservoirs in the region. The lithofacies of the modern fluvial deltaic system has several distinct geomorphic units and sub-environments such as alluvial, fluvial, delta plain, aeolian, intertidal, coastal sabkha and eustuarine sediments. This study intends to characterize the lithofacies and the depositional environments and to produce an integrated facies model for this modern fluvial-deltaic system. The study might provide a valuable modern analog to several important subsurface Neogene formations that act as important hydrocarbon reservoirs and groundwater aquifers. The study integrates information and data obtained from landsats, maps and detailed field observation and measurements of facies analysis of the fluvial and deltaic along traveses from the Arabian Shield to the Red Sea coast. The lithofacies sediment analysis revealed four main lithofacies associations namely lithofacies A,B,C ad D. Lithoacies Associations A, which represents the oldest unit is dominated by coarse gravel with minor sands facies. While the lithofacies B is dominated byfine gravel and sand lithofacies, occasionally pebbly, vary from horizontal, planar to massive sands with minor laminated to massive silts and mud facies. The lithofacies in A and B show lateral proximal to distal variation as well as characteristic vertical stacking patterns. The Facies Association A and B indicates a change in fluvial depositional styles from gravelly alluvial fans to gravelly sandy fluvial systems. The lithofacies association C represents the recent fluvial system which consists of minor gravel lag deposits associated maily with various sand lithofacies of planner, horizontal and massive sand associated with massive and limainted sand and mud lithofacies. The lithofacies Association D is dominated with Barchan sand dunes local interfigger with muddy iinterdunes and sand sheets. Lithofacies D occupies rather more distal geomporphic position of the fluvial deltaic system that is adjace to coastal sabkha. The lithofacies associations described here document the evolution and development of the coastal plain sediments through space and time under various autocyclic and allocyclic controls. This included the tectonics and structural development associated with the Red Sea rifting and opening since the Oligocene – Miocene time. Others controls include the evolution of the Arabian shield (provenance) and the coastal plain through space and time as controlled by tectonics, sediment supply, climate and locally by autocyclic environmental This study might be beneficial for understanding the controls and stratigraphic evolution of the Red Sea region and will be of great value for reservoir and aquifer characterization, development and management. This modern analog model can also help in providing geological baseline information that would be beneficial for understanding similar ancient fluvial deltaic sediments. The study might provide guides and leads to understand the subsurface facies, stratigraphic architecture and heterogeneity of any potential groundwater aquifers and hydrocarbon reservoirs.

A siliciclastic coastal Sabkha, capricorn coast, Queensland, Australia

1986 ◽  
Vol 48 (3-4) ◽  
pp. 169-181 ◽  
Author(s):  
P.G. Flood ◽  
P.D. Walbran
Keyword(s):  
Coastal Sabkha

Source of solutes to the coastal sabkha of Abu Dhabi

2002 ◽  
Vol 114 (3) ◽  
pp. 259-268 ◽  
Author(s):  
Warren W. Wood ◽  
Ward E. Sanford ◽  
Abdul Rahman S. Al Habshi
Keyword(s):  
Abu Dhabi ◽  
Coastal Sabkha

Spatiotemporal Δ17O variability in the rock record

2020 ◽  
Author(s):  
Matthew Warke ◽  
Ross Pettigrew ◽  
David Millward ◽  
Robert Raine ◽  
Stuart Clarke ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Coastal Wetland ◽  
Sulfide Oxidation ◽  
Depositional Environments ◽  
Atmospheric Composition ◽  
Spatiotemporal Variability ◽  
Rift Basins ◽  
Margin Setting ◽  
Coastal Sabkha

<p>The  Δ<sup>17</sup>O value of sedimentary sulfate can provide a direct, stable, geological archive of atmospheric-biospheric evolution. Negative Δ<sup>17</sup>O values in gypsum/anhydrite are inherited from the negative Δ<sup>17</sup>O value of atmospheric O<sub>2</sub> which is transferred to sulfate during sulfide weathering. The magnitude of the O<sub>2</sub> Δ<sup>17</sup>O value reflects pCO<sub>2</sub>, pO<sub>2</sub> and gross primary productivity, hence modelling of the geological Δ<sup>17</sup>O record has led to estimates of changing atmospheric composition and primary productivity over Earth history. However, sulfate Δ<sup>17</sup>O values represent a conservative estimate of atmospheric Δ<sup>17</sup>O values as the magnitude of negative Δ<sup>17</sup>O in sulfate can be diluted (or erased) through sulfur cycling. As sulfate is transported away from the site of sulfide oxidation the likelihood of this happening increases.</p><p>Although this effect is acknowledged, the extent to which Δ<sup>17</sup>O values may vary within and between palaeoenvironments, and how evaporite sedimentology may affect stratigraphic interpretations of Δ<sup>17</sup>O values, remains unclear. We present the preliminary results of two case-studies probing the spatiotemporal variability of Δ<sup>17</sup>O values.</p><p>Case-study 1: temporally correlative Tournaisian (Lower Mississippian) evaporites within Carboniferous rift basins of Britain and Ireland were deposited in a range of settings: coastal wetland (Ballagan Fm.); supratidal sabkha on margin of a restricted basin (Ballycultra Fm.); and coastal sabkha on open ocean margin (Middleton Dale Anhydrite Fm.) All three settings plot on a positive slope in d<sup>34</sup>S vs Δ<sup>17</sup>O space with values ranging between δ<sup>34</sup>S ≈ +15 ‰, Δ<sup>17</sup>O ≈ -0.08 ‰ and δ<sup>34</sup>S ≈ +24 ‰, Δ<sup>17</sup>O ≈ -0.2 ‰. We discuss whether this trend (and intraformational trends) represents a spatial variability in sulfate Δ<sup>17</sup>O as controlled by fluctuating fluvial and marine dominance in evaporite depositional environments, or whether this might represent a temporal change in δ<sup>34</sup>S and Δ<sup>17</sup>O.   </p><p>Case study 2: non-marine evaporites of the early Permian Cedar Mesa Sandstone (CMS) Formation in Utah were deposited in continental saline pans in an erg-margin setting that fluctuated through arid and humid cycles. These evaporites record negative Δ<sup>17</sup>O values as low as -270 per meg, however δ<sup>34</sup>S values lie along the marine curve. We interpret the signal preserved in the CMS as recycling of the underlying marine evaporites of the late Carboniferous Paradox Formation which have been uplifted on the basin margin. Hence, we discuss how in non-marine settings the recycling of evaporites can decouple the age of the succession from the age of the atmospheric Δ<sup>17</sup>O signal.</p>

Coastal Sabkha Preservation in the Arabian Gulf

Geoheritage ◽  
2012 ◽  
Vol 5 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Stephen W. Lokier
Keyword(s):  
Arabian Gulf ◽  
Coastal Sabkha

Dolomite formation within microbial mats in the coastal sabkha of Abu Dhabi (United Arab Emirates)

Sedimentology ◽  
2010 ◽  
Vol 57 (3) ◽  
pp. 824-844 ◽  
Author(s):  
TOMASO R. R. BONTOGNALI ◽  
CRISÓGONO VASCONCELOS ◽  
ROLF J. WARTHMANN ◽  
STEFANO M. BERNASCONI ◽  
CHRISTOPHE DUPRAZ ◽  
...  
Keyword(s):  
United Arab Emirates ◽  
Microbial Mats ◽  
Abu Dhabi ◽  
Coastal Sabkha ◽  
Dolomite Formation

Lithology, mineral assemblages and microbial fingerprints of the evaporite-carbonate sediments of the coastal sabkha of Abu Dhabi and their extraterrestrial implications

2010 ◽  
Vol 9 (3) ◽  
pp. 147-156 ◽  
Author(s):  
Fadhil N. Sadooni ◽  
Fares Howari ◽  
Howell G.M. Edwards ◽  
Ayman El-Saiy
Keyword(s):  
Sand Dunes ◽  
Abu Dhabi ◽  
Carbonate Sediments ◽  
Mineral Association ◽  
Oman Mountains ◽  
Surface Samples ◽  
Desert Varnish ◽  
Mineral Assemblages ◽  
Geomorphic Features ◽  
Coastal Sabkha

AbstractDeep-core and surface samples collected from the coastal sabkha of Abu Dhabi were subjected to a multi-proxy study, including petrographic, geochemical and spectroscopic analyses. The sediments studied are composed of biochemical carbonate-evaporite mineral suites, such as calcite, dolomite, aragonite and gypsum, as well as clastic minerals, such as quartz, feldspar and serpentine. These sediments were also strongly influenced by microbial activities as reflected by the presence of cyanobacterial mats, boring, gas bubble structures, pustular and other macro and micro textures. A combination of marine, fluvial, aeolian, and groundwater processes shaped the geomorphology of the area and led to the formation of such mineral suites, as well as their microbial contents. Data collected from Mars indicate that its surface regolith contains sandstone composed of siliciclastic basaltic debris, as well as carbonate (e.g. magnesite) and evaporite (e.g. jarosite and relics of gypsum) mineral assemblages. Additional data suggest the presence of geomorphic features, characteristic of an arid climate, such as sand dunes and desert varnish. The hydrological model for the Late Noachian-Hesperian period of the plant proposed the existence of a surficial layer containing endolithic and stromatolitic cyanobacterial lamina. The combination of the coastal sabkha of Abu Dhabi with its carbonate-evaporite mineral suites, the neighbouring sand dune fields of the Empty Quarter Desert and the basaltic sediments resulted from weathering the ophiolitic Northern Oman Mountains to form a candidate terrestrial geologic province that may explain the mineral association of Mars and its potential biosignatures. The lithological features and the mineral association of the sabkha can be recognized by the present day detection equipment used on Mars, and even if their biosignatures are degraded, their existence may be inferred from these features.

scholarly journals Distribution and Significances of the Major Oxides in Recent Coastal Sabkha Sediments of the Al-Dafna Plateau, northeast Tobruk, Libya

2021 ◽  
Vol 1 (2) ◽  
pp. 12-19
Keyword(s):  
Correlation Coefficients ◽  
Major Elements ◽  
Raw Material ◽  
Weathering Processes ◽  
Major Oxides ◽  
Parent Rocks ◽  
Coastal Sabkha ◽  
Abundance And Distribution ◽  
Evaporite Minerals ◽  
The Vertical Distribution

Twenty sabkha samples were chemically analyzed by XRF technique for determination of their major oxides concentrations. Six cores penetrated both the intertidal and supratidal flat zones developed in six wadis mouths in the coastal stretch of the Al-Dafna plateau, northeast Tobruk city. The significance distribution and concentration of the major oxides are discussed and interpreted. Elements in the raw material of the study area reflect important evidence of geochemical weathering processes that affecting parent rocks as well as conditions of sedimentation, and rate of deposition. Correlation coefficients have been used to illustrate the abundance and distribution of these elements. The distribution of major oxides are follows Si2O > CaO > LOI > Al2O3 > SO3 > MgO > Na2O > K2O. The vertical distribution of major elements is mainly controlled by the abundance and proportions of the clastics, carbonates and evaporite minerals. It was found that silica present in the form of detrital, subrounded to rounded silt- to sand-sized quartz grains, while the content of Al2O3 is associated with terrigenous argillaceous materials. On the other hand, the presence of Fe2O3 is related to the abundance of clastic materials in sabkha deposits. It was found that K2O and Na2O concentrations increase toward the sabkha surfaces.

Coastal sabkha dolomites and calcitised sulphates preserving the Lomagundi-Jatuli carbon isotope signal

2011 ◽  
Vol 189 (1-2) ◽  
pp. 193-211 ◽  
Author(s):  
A.T. Brasier ◽  
A.E. Fallick ◽  
A.R. Prave ◽  
V.A. Melezhik ◽  
A. Lepland
Keyword(s):  
Carbon Isotope ◽  
Coastal Sabkha
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