SEAWATER TEMPERATURE RECORDS OF BENTHIC FORAMINIFERA IN BELEK, EAST ANTALYA, TURKEY
11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 1011-1018 pp
The study includes the geochemical data of foraminifera in Pleistocene-Holocene aged
marine sediments outcropping along the coasts of Gulf of Antalya and around the Belek, Kadriyeköy and Kumköy settlement places in the south of the Serik (eastern Antalya) in Turkey. The chemistry of benthic foraminifera tests can include records of seawater and
provide data on environmental interpretation.
For this purpose a total of 28 benthic foraminifera were selected from similar genus and
species of benthic foraminifera and EDS analysis were carried out on these tests. 11
hyaline, 15 porcelain and 2 agglutinated benthic foraminifera tests were examined in
detail by using X-ray method. The changing of trace elements and oxide compound
values of these foraminifera tests obtained by semi-quantitative analysis were observed.
These analysis indicate that most of benthic foraminiferal tests have normal levels of
heavy metals. But in just a few examples have relatively high values of Pb, Fe, Mn,Cr,
Ni, Zn, Hg and Cu. Especially high Pb, Zn ve Cu values, suggest that these high values
may indicate the effects of river transport or industrial and anthropogenic activities.
Besides the high CaO and relatively low SiO2 contents of foraminifera tests verify that
the majority of the foraminifer tests consist of CaO.
The sample groups were discussed from surface to depth as recent marine surface
sediments, upper, medium and lower levels of drilling, ancient marine surface sediments
to see the change by depth. MgO, SnO2 relatively decreases, Al2O3, SiO2, Cu2O
relatively increases, K2O, CaO, Fe2O3, ZnO, As2O5, PbO2 increases by depth. In EDS
analysis agglutinant tests have high Al2O3, K2O and SiO2 and relatively low CaO,
Hyaline tests have high CaO and relatively low SiO2, porcelain tests have high CaO and
relatively high MgO values. The high Al2O3, K2O and SiO2 are thought to arise from
grains surrounding the agglutinant tests.
The Mg/Ca ratios of tests of benthic foraminifera were used for determining the
seawater temperature (SWT). SWT was calculated for each test types and each levels of
the area. The avarage seawater temperature determined as 20,03 °C for hiyaline
foraminifera tests as 38,69°C for porcellanaceous foraminifera and as 42,93°C for
agglutinated foraminifera tests. Besides in recent marine surface sediments SWT ranges
between 14,32-43,37 ºC, in the upper levels of drillings SWT ranges between 12,56-
41,11ºC, in the medium levels of drillings SWT ranges between 17,08-41,52 ºC, in the
lower levels of drillings SWT ranges between 16,06-44,92ºC, the ancient marine surface
sediments SWT ranges between 21,26-39,70ºC. All these data indicates that seawater
temperature decreases by depth. In other words from past to present seawater
temperature relatively increases in the Gulf of Antalya.
Keywords: Benthic foraminifera, Seawater temperature, Ca/Mg, Trace elements, Belek
PAPER 2011/s14.103: SEAWATER TEMPERATURE RECORDS OF BENTHIC FORAMINIFERA IN BELEK, EAST ANTALYA, TURKEY
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