Paper Information

Title:  BIOTURBATED INTERTIDAL SEDIMENTS OF THE NORTH PERSIAN GULF: A CASE STUDY FROM SOUTH BANDAR ABBAS COASTAL AREAS
Type: POSTER
Author(s): ARZANI N.*
 
 *GEOLOGY DEPARTMENT, UNIVERSITY OF PAYAME NOUR, KOHAMDEJ, ESFAHAN, IRAN
 
Name of Seminar: GEOLOGICAL CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  IRANIAN GEOLOGICAL SOCIETY
Date:  2005Volume 9
 
 
Abstract: 

Intertidal flat sediments of the south Bandar Abbas coastal areas, in northern Persian Gulf, have been studied for degree of bioturbation in a diurnal tidal cycle and basically during low tides in early spring. The studied exposed intertidal zone covers ٥ km along the coast and 1, 5-2 km perpendicular to the shoreline. This area comprises mainly sandy to mixed sandy-muddy flats dissected by with wide tidal channels and point-sourced, transverse channels of the wastewaters of the shoreline inhabitants.
Burrowing organisms, mainly gastropods, crabs, mudskippers and bivalves, redistribute the sediments, which comprise mainly sandy skeletal grains, carbonate mud with a minor fraction of terrigenous sandy to mud-sized particles. The tidal regime of the area is near to the upper limit of a microtidal system combined with a pronounced counterclockwise, ring-shaped gulf current, which originates from strait of Hormoz and flows the Iranian coasts and then toward the Abu Dhabi in the south. As the result the studied area receives nearly normal seawater chemistry not comparable to the southern Persian Gulf, where the intertidal areas are generally or at least potentially hypersaline. In a land sea traverse, the remarkable sediment redistribution by means of organisms is different degree of burrowing by gastropods, crabs, mudskippers and bivalves, which has been investigated during in this study. The two animal group, small digging crabs and mudskippers are the dominant sediment burrows, whereas the small gastropods (e.g. Turittella) are very important for their tracks on the sediment surface. Mudskipper are very active in early low tides and each fish dig his own deep burrow where it hides rom disturbances and during high tides.

 
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