2.3 Eolian Sediments
59
a
DOMINANT WIND
DIRECTION tJ
:tHYPERSALINE BAY WITH
TlDAL AND SUPRA-TIDAL
IN WETTER PERIODS:
LAKES AND INTERDUNE
FLUVIAL ACTIVITY
SED. AND COASTAL SABKHAS
MIGRATION OF
EOLIAN SAND
OVER EMERGED
SHELF (LOW
SEA LEVEL)
SEAWARD PRO·
GRADING SANDY
COASTAL BELT
(HIGH SEA LEVEL)
SHALLOW -MARINE
SEDIMENTS (E.G.
SANDY CARBONATES) ,
COASTAL AND SHALLOW·
EDGE
HIGHEST Sj:A LEVEL
MARINE SANDS
b
..
VEGETATION
SAND DUNES ON
EMERGED SHELF
;DLDER COASTAl DUNES, PRESERVED DUE TO
RAPID CARBONATE CEMENTATION
DURING LOW SEA L
L
Fig. 2.23. a Interaction between seaward migrating
eolian sands and marine processes including relative
sea-level changes. In interdune areas, lakes or fluvial
systems may develop. (Mainly based on Samthein
and Diester-Haass 1977; Schwarz et al. 1975; Einseie
et al. 1977). b Various types of coastal dunes resultMIGRATING SAND
ing from onshore winds. In arid regions, the coastal
sand can migrate far inland to feed interior sand seas,
while it is stabilized by vegetation in the more humid
zones. During low sea level, shelf sand can contribute to the buildup of coastal dunes. See text for further explanation