Top Tweets for #supratidal
A couple of great days out in the field looking at #groundwater #supratidal interactions. @UON_research @CCoastCouncil @hydrogeoscience
Spectacular morning to be out in the field! #saltmarsh #mangrove #supratidal @UON_research @uowresearch @AberUni
Gastropods Lag Behind. #Gastropods exposed at the surface as a 'lag' during deflation of the most landward part of the #supratidal zone of the Abu Dhabi #Sabkha.
#SabkhaImageOfTheDay
Today we are in the #supratidal zone of the Abu Dhabi #sabkha. Evaporation of fluids from the capillary zone precipitates #halite that displaces laterally to form polygons. The brown colour is from trapped aeolian dust.
Detials in: https://t.co/hqXmmkZYo8
#SabkhaImageOfTheDay
Sabkha scribble. Anhydrite lies just below the sabkha surface in the #supratidal zone of the Abu Dhabi #sabkha. The finely crystalline #anhydrite is formed through the dehydration of precursor #gypsum.
#SabkhaImageOfTheDay
#Anhydrite precipitates in the shallowest subsurface of the Abu Dhabi #sabkha #supratidal zone.
#SabkhaImageOfTheDay
Halite polygons formed through the displacive lateral growth of #halite at the #sabkha surface in the #supratidal zone. Details of the process here: https://t.co/hqXmmkZYo8
#SabkhaImageOfTheDay
Degraded #halite polygons in the #supratidal zone of the #sabkha. The brown colour is due to the trapping of wind-blown dust. Decaying polygon margins result from dissolution by dew in the early hours of the morning. Details here: https://t.co/hqXmmlhzfG
#SabkhaImageOfTheDay
A close up of the #anhydrite horizon that in the shallowest subsurface of the #supratidal zone of the #sabkha. A distinctive clotted texture has resulted I this being colloquially referred to as ‘cottage cheese anhydrite’.
#SabkhaImageOfTheDay
A close up of the #gypsum horizon that we see in the subsurface of the #supratidal zone of the #sabkha. Often referred to as a ‘gypsum mush’ this sediment is, in fact, a gypsum gravel.
#SabkhaImageOfTheDay
A typical #sabkha sequence when we dig a shallow pit in the #supratidal zone. The grey band at the base is lagoonal sand, overlain by #intertidal microbial mat (black), supratidal #gypsum (brown) and #anhydrite (white). #WalthersLaw in action!
#SabkhaImageOfTheDay
During rainfall, the surface #halite crust in the #supratidal zone suffers #dissolution. Subsequent #evaporation results in the #precipitation of fresh clean halite (coin 2.35 cm diameter). Check out this process in this paper: https://t.co/hqXmmlhzfG
#SabkhaImageOfTheDay
Role up, Role up! The ongoing #transgression of the Abu Dhabi #sabkha sees the upper #intertidal zone #microbial mat belt backstepping over former #supratidal facies. This thin mat veneer is particularly susceptible to removal during high energy events. #SabkhaImageOfTheDay
Checking out the sub-surface of the Abu Dhabi #sabkha can involve a lot of digging! Here in the #supratidal zone where the angle of slope is 0.05-0.06 degrees. See this paper for further details: https://t.co/ex8SjKODGi
#SabkhaImageOfTheDay
#Anhydrite precipitates immediately below the #supratidal #sabkha surface to form a ‘cottage cheese’ texture. Note the very thin (mm-scale) #halite crust overlying the anhydrite (coin 2.35 cm diameter) #SabkhaImageOfTheDay
Decay. This #halite crust in the #sabkha #supratidal zone exhibits a number of features providing evidence of 'maturity'. The 'brown fluffy appearance is trapped wind blown dust, the holes on 'topographic highs' are a result of overnight #dissolution by dew #SabkhaImageOfTheDay
Experimental investigations into the influence of biofilms and environmental factors on short‐term microtopographic fluctuations of supratidal sandstone - Yuan - - Earth Surface Processes and Landforms - Wiley Online Library https://t.co/9ryEghMMGs
#Sabkha image of the day. #Halite masses and halite rafts in a #supratidal brine pool fed by #hypersaline groundwater.
#Sabkha image of the day. Something salty! #Halite precipitated in the lowermost #supratidal zone after storm surge.
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