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Published by way of the yank Geophysical Union as a part of the Special guides Series.
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Additional resources for Geotrekking in Southeastern Arabia: a Guide to Locations of World-Class Geology
During the wet period 9 to 6 ka, these salts were redissolved and transported into the groundwater system [Wood and Imes, 2003]. 24. Close-up of a salt crust and gypsum domes on the surface of an inter-dune sabkha. As the salt precipitates it takes up a greater volume (due to the crystalline structure made as Na bonds with Cl) and causes the sediments it forms in to expand and swell. 25. Distinctive barchans/crescent dunes covering the surface of an inter-dune sabkha. 26. Highlighted crest and slip face of a dune.
This overlies distinctly white sabkha sediments. The ground all around the bluff is littered in gypsum crystals and anhydrite. 29). Remember that anhydrite is basically dried-out gypsum so you can see how the two can occur together. There are also lots of gastropod shellsx littering the ix The mileage varies depending on where you turn around. They are probably Potamides conicus, which are found in muddy, intertidal areas throughout eastern Arabia [see Dance, 1995, page 56–57]. 31) indicating that, locally, sea level has retreated in the recent geologic past.
Halite Crusts and Gypsum Mush. Parking area. 19), which form just at or above the water table. 17. Salt crusts. 18. Gypsum and halite mush. The hollow domes form as the salt and gypsum crystals grow. solution based on how soluble they are. From evaporating seawater, this order is halite (NaCl), gypsum (Ca[SO4] · 2H2O), anhydrite (CaSO4),vi calcite (CaCO3), and dolomite (CaMg (CO3)2) [Klein and Hurlbut, 1993]. 05401° Approximately 200–300 meters to the northwest of the parking area across the salt crust/gypsum mush surface is a small, but deep, artiﬁcially-dug, salt pond with rising gas bubbles (Figures vi Anhydrite is gypsum that has lost water from its molecular structure – see guide at the back of the book.