SEDIMENTOLOGICAL STUDIES OF THE QUATERNARY SEDIMENTS IN SOME BORE - HOLES, NORTH - EASTERN COAST OF SINAI, EGYPT.

SEDIMENTOLOGICAL STUDIES OF THE QUATERNARY

SEDIMENTS IN SOME BORE – HOLES,

NORTH – EASTERN COAST OF

SINAI, EGYPT.

M.A. EL-ASKARY, M.W. EL-DAKKAK, F.A. EL-NOZAHY AND
M.A. MOHAMED.
Faculty of Science, Alexandria Universft¥.
ABSTRACT
The present study is perfol’1lll!d on the subsurface
sedfments of El-Arfsh-Rafah distrfct. The different
aspects for stydying the borehole samples include
their texture. heavy minerals content and clay mineral
types. The samples of El-Arlsh boreholn were found
to be long to ten teltun1 chsses, those of Zewied
boreholes belong t,o s-tx textural chsses -“He tIM!
samples of Rafah bOl”eholes belong to nl,.. textural
classes. Rafah samples are finer .nd better sorted
than those of El-Arish and lewfed. Gravels are Mafnly
.concentrated fn boreholes nearer to the wadfes.
They showed wider distribution in the eastem parts
of wadfes than the western parts. This may be due
to the marfne current whfch shifted them towards
the east.
The recorded heavy Ilfnenh include op.ques.
unst.ble mInerals (amphfbole and pytoxene), ~tastable
Minerals (epIdote, granet and kyanfte) Ind ultrastable
.inerals (rutile. lircon and tourmaline). Two possible
sources are supposed to be responsible for the
derfvation of heavy .fnerals. The major portion
of theN had been derfved from the Nfle sedIments
whfle a .Inor portion is belIeved to· be derived
from the south with Nterlals that have been poured
fn the sea through the di (ferent wadies. The study
of clay ..inerals showed that IIOntmortllonfte, illfte
and heser .mounts of fr.aolfnlte are the main
components of the muddy and clayey samples.