Geochemistry, Paleoclimatology and paleogeography of the Northeast Region of the Persian Gulf (Case Study from Southern Hormuzgan, Iran)

The wisconsin glaciation was started a approximately 125,000 years ago and reached its lowest extend between 20,000 to 21,000years ago during which the sea level fell 120 to 130 meter. at the end of the ice age, about 18,000 years ago, the sea level increasedand reached its present level about 5,000 years ago. the persian gulf was exposed in the last glacial moment (lgm). after thismoment, the sea level prograted toward the persian gulf basin and reached 1 to 3 meters higher than present levels 4,000 to 6,000years ago. this study was focused on paleoecology, sedimentation and sea level changes in the northeastern portion of the persiangulf and shallow marine area in southern hormuzgan, iran near the ports of bandar abbas and shahid rajaee. hormuzgan provinceis located to the north of strait of hormuz. in this study, a core with a length of 10 meters was taken from late holocene sediments inthe northeast marine region of the persian gulf using a rotary drilling system. then different sedimentary types were studied andseparated and samples were sent for icp and xrd elementary analysis and dating. as is already known, increasing and decrease ofsea levels are related to moist weather and arid conditions respectively. additionally, it is proved that variation of elements such asal, cr, fe, k, mg, mn, ti, and zn have a direct relation to sea level changes. it is shown that the variations of sr and ca having areverse relation to sea level changes. geochemical study and dating on sediments shows that although the sea level rose 10,000 yearsago in the studied region, 3,700 to 6,800 and 7,900 to 9,300 years ago, the sea level and rate of precipitation in this area was higherthan the mean. this illustrates an increase in rain and humidity during these two periods.