STUDIES ON mEPARTICLE SIZE DISTRIBUTION AND BornliGHT AND REA VYldINERALS OF RECENTSEDIMENTS ATROSEITA NILE BRANCH (EGYP1)

STUDIES ON mEPARTICLE SIZE DISTRIBUTION AND BornliGHT

AND REA VYldINERALS OF RECENTSEDIMENTS ATROSEITA NILE

BRANCH (EGYP1)

BY
L M. H. LOTFY*
“”Inlond Water andAqua Cul1JlTe Branch, NationallnSL ofOceano. And FiSheries
Key Words: Sedimentology – Mineralogy – Recent sediments – Rosetta Nile branch
ABSTRA.CT
The present study deals with the sedimentological and mineralogical
im’estigations ofthe recent sediments a/Rosella Nile branch. the sediment
l}pes change from sand, muddy sand. gravelly sand and graTelly mud to
medium fine and very fine sand and muddy sand with variation ofdepth
and location. The sediments represent most(v medium to l’ery fine sand
size. well sorted to very poor(v sorted. positirely to negatively skewed and
mostly [eplOf..:urtic.
The main minerals present in the sandy size are quart::, feldspar.
carbonates and hemy minerals. The distribution mry with location and
depth. At Kafr El Zayat and Edfina srarivns is characterized by the least
distinguishing degree ofmaturiry.
The heavy minerals are mainly composed ofopaques and then unstable
minerals (amphibole and pyroxene). Two associations have been identified
as follows: The mixed association (92.59%) and the amphibole-pyroxene
association (7.-12%). The main source ofRosetta Nile branch sediments is
the south Nile sediments. The hemy minerals a.~semblages appear
immature.