GEOCHEMISTRY OF SEDIHlNT CORES FROM THE SEA OF MARMARA, EASTERN TROUGH.

GEOCHEMISTRY OF SEDIHlNT CORES
FROM THE SEA OF MARMARA, EASTERN TROUGH.
By
ATEF A. MOUSSAt
!KO MOUSTAFA ERGIN
“National Institute of Oceanography and Fisheries, Kayet Bey, Alexandria,
Egypt.
Key words: Geochemistry, Sedimentology, Sea of Marmara.
ABSTRACT
The major and trace elements were studied in two sediment cores
taken from the Eastern Marmara Trough. Both cores are extremely
homogenized, having a structurless appearance except for bioturbation
marks. They’ comprised essentially of fine materials; 1-2 \ sand, up to
70 \ silt and up to 40 , clay.
The calcium carbonate content is about 15-18 \, and the organic
matter is about 2-3 \. Since the sediments are practically free of
sands, most of the carbonates is attributed to coccolithophores,
which are shown to be abundant.
The concentrations and interrelationships of major elements
lndicate a terrigenous source in the flrst place and biogenous one in
the second place. Yet, a hydrogenous source (authigenlc) is also
ldentifled from trace elements associations concentrations.
Post-depositional mobilization of elements and early diagenetic
reactions are indicated.