tawfeek.mahran

Tawfiq Mohamed Mahran

Professor - أستاذ

Faculty of science

Address: Geology Dept. - Faculty of Science- Sohag University

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Facies and sedimentary development of dominantly siliciclastic Late Neogene sediments, Hamata area, Red Sea coast, Egypt.

1993 | Keywords U. Miocene-Pliocene, Plio-Pleistocene, tectonic depression, sedimentation, clastic, discharges,
Facies and sedimentary development of dominantly siliciclastic Late Neogene sediments, Hamata area, Red Sea coast, Egypt.
THE AREA WEST OF HAMATA BETWEEN WADI RANGA AND WADI UM GHAZAL, EXPOSES THE COMPLETE NEOGENE SECTION. HOWEVER OUTCROPS OF LOWER AND MIDDLE MIOCENE ARE LIMITED TO A NARROW BELT IN THE NORTH, WHERAS THE REST OF THE AREA IS EXTENSIVELY COVERED BY THE U. MIOCENE-PLIOCENE SILICICLASTICS OF THE MERSA ALAM FORMATION. THE PLIOCENE CARBONATES OF THE SHAGRA FORMATION ARE ... Read more

Sedimentology of Upper Pliocene-Pleistocene sediments of the Nile Valley area: A Model around Aulad Toq Sharq Environs, SE Sohag, Egypt

1993 | Keywords U. Pliocene-Pleistocene, Aulad Toq Sharq, Nile Valley, Facies, Formation, Channels, clastics, overbank, flood plain,
Sedimentology of Upper Pliocene-Pleistocene sediments of the Nile Valley area: A Model around Aulad Toq Sharq Environs, SE Sohag, Egypt
DISTRIBUTION AND FACIES CHANGES OF THE U. PLIOCENE-PLEISTOCENE SEDIMENTS IN THE AREA AROUND AULAD TOQ SHARQ EXHIBIT THREE DEPOSITIONAL MODES: 1: IN THE FIRST MODE, WHICH PROBABLY IN LATE PLIOCENE-EARLY PLEISTOCENE THE EARLIEST SEDIMENTATION WAS STARTED WITH FLOOD PLAIN FINE SILICICLASTICS (MADAMOUD FORMATION), FOLLOWED UPWARD BY ACCUMULATIONS OF RELATIVELY THICK TERRIGENOUS LACUSTRINE SEDIMENTS AT THE WEST, WHICH HAVE BEEN INTERFINGERED ... Read more

Mineralogical and textural characters of the Pliocene-Quaternary Nile sediments, Wadi Qassab area, Sohag, Egypt

1992 | Keywords Clay minerals, Pliocene-Quaternary, Nile, Wadi Qassab,
Mineralogical and textural characters of the Pliocene-Quaternary Nile sediments, Wadi Qassab area, Sohag, Egypt
THE PLIOCENE- QUATERNARY NILE SEDIMENTS, OCCURRING AT WADI QASSAB AREA, COULD BE DIFFERENTIATED INTO FOUR TERRACES AND RECENT RIVER ISLANDS. THE LITHOLOGIES OF THESE SEDIMENTS AS WELL AS THEIR HEAVY MINERAL CONTENTS SUGGEST FIVE SUCCESSIVE STAGES OF EVOLUTION OF THE RIVER NILE. THE OLDER NILE SEDIMENTS SHOW A RELATIVE DEFICIENCY IN PYROXENES, WHERAS THE MODERN SEDIMENTS SHOW HIGHER CONCENTRATION OF ... Read more

Facies and depositional Environments of U. Pliocene-Pleistocene Nile sediments Around Sohag Area, Nile Valley, Egypt

1992 | Keywords U Pliocene-Pleistocene, Sohag, Fluviatile, flood plain, clastics, Nile,
Facies and depositional Environments of U. Pliocene-Pleistocene Nile sediments Around Sohag Area, Nile Valley, Egypt
THE U. PLIOCENE-PLEISTOCENE NILE SEDIMENTS CROPPING OUT AROUND SOHAG AREA CONSTITUTE THREE TERRACES THAT COULD BE SUBDIVIDED INTO FOUR LITHOFACIES: FACIES A: DOMINANTLY FLOOD PLAIN FINE SILICICLASTICS SEDIMENTS (THE LOWER PART OF THE HIGHST TERRACE) FACIES B: MIXED COARSE CLASTICS-CARBONATES AND DOMINANT FINE SILICICLASTICS DEPOSITED IN LACUSTRINE ENVIRONMENTS (THE UPPER PART OF THE HIGHST TERRACE) FACIES D: DOMINANTLY FLOOD PLAIN ... Read more

Origin of post-Eocene Red Breccias (Brocatelli) around Sohag area, Nile Valley, Egypt

1991 | Keywords Red Breccias, Nile Valley, Iss,
Origin of post-Eocene Red Breccias (Brocatelli) around Sohag area, Nile Valley, Egypt
The post-Eocene Red Breccias (Brocatelli) outcropping around Sohag extend as a separate belt occupying the proximity of a fault-controlled escarpment. Based on the stratigraphic level and the textural characteristics these breccias are subdivided into three types, clearly separated by paleosol horizons. A- Red breccias 1; composed of massive and crushed deposits accumulated as fault breccias. Its distribution is structurally controlled. ... Read more

Sedimentology of Syn-rift Upper Miocene (?) Pliocene sediments of the Red Sea area: A model from the environs of Mersa Alam , Egypt

1989 | Keywords Mersa Alam Fm., Shagra Fm., samadai Fm., Facies, Faulting, Tilting, Rejuvination, Sedimentology, Rifting,
Sedimentology of Syn-rift Upper Miocene (?) Pliocene sediments of the Red Sea area: A model from the environs of Mersa Alam , Egypt
THE POST ABU DABBAB EVAPORITE UPPER MIOCENE (?) PLIOCENE SEDIMENTS ALONG THE RED SEA COASTAL AREA SOUTH AND NORTH OF MERSA ALAM COULD BE SUBDIVIDED INTO THREE LITHOFACIES: FACIES A : DOMINANTLY FLUVIATILE SILICICLASTICS, WITH RESTRICTED MARINE CARBONATES AND EVAPORITES NEAR THE TOP (SAMH MB. OF MERSA ALAM FM.). FACIES B: OPEN MARINE, MIXED SILICICLASTIC-CARBONATE SEDIMENTS DEPOSITED IN BEACH, INTERTIDAL ... Read more

Comparison between Miocene and Pliocene facies distribution related to Syn Rift tectonics along the Egyptian Red Sea coastal area

1988 | Keywords Neogene-Facies, siliciclastic-,
Comparison between Miocene and Pliocene facies distribution related to Syn Rift tectonics along the Egyptian Red Sea coastal area
Two different regimes of Neogene sedimentation can be recognized along thr Red Sea coastal area: 1- The first regime comprises the Pre-Abu Dabbab Evaporite Miocene sediments. The distribution of the facies is mainly governed by the main western Miocene NW fault bounding the edge of the Red Sea rift as well as the NW trending fault-blocks. Carbonates were mainly deposited ... Read more

The problem of the Late Miocene-Early Pliocene boundary along the Red Sea coastal area between Quseir and Mersa Alam, Egypt.

1988 | Keywords fossil con, Pliocene, Miocene,
The problem of the Late Miocene-Early Pliocene boundary along the Red Sea coastal area between Quseir and Mersa Alam, Egypt.
The Late Miocene- Early Pliocene succession of the Red Sea coastal area between Quseir and Mersa Alam is differentiated, from base to top, into: Abu Dabbab Evaporites and the overlying informal rock units (A), (B) and (C). The characteristic features of Unit (A) (Lithofacies, mineralogical, chemical compositions, fossil content as well as field relations) suggest that these sediments represent the ... Read more

Iron-manganese mineralization in Miocene sediments at southern Eastern Desert, Egypt

1987 | Keywords Iron-Manganese, Miocene--mineralization,
Iron-manganese mineralization in Miocene sediments at southern Eastern Desert, Egypt
A NOTICEABLE IRON-MANGANESE MINERALIZATION HAS BEEN RECORDED FOR THE FIRST TIME IN THE UPPERMOST PARTS OF SOME MIDDLE MIOCENE CARBONATES AND SILICICLASTICS WEST OF RAS HONKORAB AND NORTH OF WADI EL GEMAL RESPECTIVELY. THE MINERALIZATION IS GENETICALLY RELATED TO PERCOLATING SOLUTIONS BEARING FE AND MN. DUE TO RELATIVE CHANGES IN PH AND/OR EH CONDITIONS, SOME DEPOSITS ARE SEPARATED MAINLY EITHER ... Read more

Plio-Pleistocene calcretes and palustrine facies of Sohag area, Nile basin: a response to local subsidence, clastic sediment influx and paleoclimatic conditions.

| Keywords calcretes, Facies, paleoclimat,
Plio-Pleistocene calcretes and palustrine facies of Sohag area, Nile basin: a response to local subsidence, clastic sediment influx and paleoclimatic conditions.
During the Plio-Pleistocene times, calcretes and associated palustrine sediments were deposited on the margins of the Nile in Sohag area. These deposits laterally interfinger with narrow peripheral alluvial fans towards the River Nile margins, wheras towards the center of the basin, they graded into the fluvial systems transverse to the alluvial fans. Overtime, the peripheral carbonate facies were replaced by ... Read more