What is sabkha area?
The sabkhas (Arabic for area of low-lying salty ground) are broad intertidal areas and coastal plains (Figs. 8 and 9) that may be flooded by lagoon waters when storm winds blow landward. From: Encyclopedia of Geology (Second Edition), 2021.
What are sabkha soils?
Sabkha soils are salt-bearing formations that are formed in arid regions. In their in situ states the sabkha soils have high compressibility and low shear strength. These soils are also heterogeneous and their properties depend on the type and amount of salt present.
What is sabkha deposit?
Sabkha deposits are one of the Arabic expressions to describe recent coastal sediments with a high salt content. Sabkhas may occur inland or as coastal sabkha, which are common in arid shallow-shelf environments.
How do you pronounce sabkha?
Pronunciation
- (UK) IPA: /ˈsæbkə/, /ˈsæbxə/
- (US) IPA: /ˈsɑbkə/
What is sabkha geology?
A sabkha (Arabic: سبخة) is a coastal, supratidal mudflat or sandflat in which evaporite-saline minerals accumulate as the result of semiarid to arid climate. Sabkhas are gradational between land and intertidal zone within restricted coastal plains just above normal high-tide level.
How are evaporite rocks formed?
Evaporites are layered crystalline sedimentary rocks that form from brines generated in areas where the amount of water lost by evaporation exceeds the total amount of water from rainfall and influx via rivers and streams.
How are Sabkhas formed?
If the features silt up, or the land rises, or the sea level falls, then the trapped water evaporates, leaving a flat salt pan, or sabkha. If the coastal region has irregular topography, then the flooding creates large independent creeks, or khors. A khor is a shallow, subtidal flat or tidal inlet.
What are evaporite minerals commonly used for?
Evaporite minerals, especially nitrate minerals, are economically important in Peru and Chile. Nitrate minerals are often mined for use in the production on fertilizer and explosives.
Where do evaporites most commonly form?
Evaporite minerals are deposited from saline lakes, where they form as a result of the evaporative concentration of lake water (see SEDIMENTARY ROCKS | Evaporites).
What type of rock is evaporite?
Which rock is classified as an evaporite?
Evaporite rocks form when sea water or lake water dries up and precipitates gypsum (CaSO4·2H2O), halite (NaCl), or other minerals. Evaporites are chemical sedimentary rocks.
What is the meaning of evaporites?
: a sedimentary rock (such as gypsum) that originates by evaporation of seawater in an enclosed basin.
How are evaporites deposited?
Evaporite deposits (largely bedded halite, sylvite, gypsum, anhydrite, and various potash salts) form from the precipitation of solid mineral crystals from a concentrated solution of salt- or freshwater, in other words, from brine. Evaporite deposits may be either marine or nonmarine (lacustrine) in origin.
How is an evaporite formed?
Where are evaporites found?
saline lakes
Evaporite minerals are deposited from saline lakes, where they form as a result of the evaporative concentration of lake water (see SEDIMENTARY ROCKS | Evaporites).
How do evaporites occur?
What conditions produce evaporites?
The main conditions for evaporite formation in a basin are:
- evaporation rate exceeding rainfall, surface water and groundwater inflows (negative water balance),
- closed or restricted hydrologic circulation, and.
- sufficient solute supply in the inflow waters.
What is evaporite used for?
Which is an example of an evaporite?
Examples include gypsum, anhydrite, rock salt, and various nitrates and borates. The term sometimes includes rocks developed by metamorphism or transport of other evaporites.
What rocks are evaporites?
What are examples of evaporites?
The most common marine evaporites are calcite, gypsum and anhydrite, halite, sylvite, carnallite, langbeinite, polyhalite, and kainite.
What are evaporites classified as?
Evaporites are considered sedimentary rocks and are formed by chemical sediments.