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العنوان
SEDIMENTOLOGY, MINERALOGY, RADIOACTIVITY AND GEOCHEMICAL PROSPECTION OF STREAM SEDIMENTS OF WADI ABU MARAWAT, CENTRAL EASTERN DESERT, EGYPT /
المؤلف
Mosa, Ahmed Moneir Tawfik Ahmed.
هيئة الاعداد
باحث / احمد منير توفيق احمد موسى
مشرف / ابراهيم عبد الناجى سالم
مناقش / السعيد رمضان احمد النشار
مناقش / جهاد محمد صالح
الموضوع
Geology.
تاريخ النشر
2019.
عدد الصفحات
250 p. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
الجيولوجيا
تاريخ الإجازة
14/7/2019
مكان الإجازة
جامعة طنطا - كلية العلوم * - Geology
الفهرس
Only 14 pages are availabe for public view

from 291

from 291

Abstract

Wadi Abu Marawat is located south Safaga, along the Red Sea coast, in the north part of Central Eastern Desert of Egypt. It is accessible by a 42 km to westward along Safaga–Qena asphalt road. Then turn to the south east through desert track, about 26 km. The area under investigations lies between latitudes 26º 29’ 00’’ – 26º 32’ 30’’ N andlongitudes 33º 36’30’’ – 33º 41’00’’ E. It covers an area of about 160 Km2.The study area The study area The study area The study area The study area The study area The study area The study area The study area The study area is bounded by G. Wairah from the north east and Khur Abu Nahas from the south west. Generally the path of this Wadi and their tributaries are controlled by faults and fracture system. This Wadi running from high relief in NE (Upper stream) to low relief in SW (Downstream).The present work deals with study of geology, petrography, geochemistry, mineralogy and radioactivity of the stream sediments and the country rocks of Wadi Abu Marawat. 9.1 Geology and petrography The Precambrian rocks exposed around Wadi Abu Marawat are arranged chronologically from the ol from the ol from the ol from the ol dest to the youngest as follows: dest to the youngest as follows: dest to the youngest as follows: dest to the youngest as follows:dest to the youngest as follows:dest to the youngest as follows: dest to the youngest as follows:dest to the youngest as follows: dest to the youngest as follows: 7. PostPost -Granitic dykes ranitic dykes ranitic dykes ranitic dykesranitic dykesranitic dykesranitic dykes. 6. Hammamat sedimentsammamat sediments ammamat sedimentsammamat sediments ammamat sediments ammamat sedimentsammamat sediments . 5. Older granites. 5. Older granites. 5. Older granites.5. Older granites. 5. Older granites. 5. Older granites.5. Older granites. 4. Metavolcanicsetavolcanics etavolcanicsetavolcanics and their metapyroclastics. 3. Banded Iron Formation. 2. M etasedimentsetasediments etasediments etasedimentsetasediments . 1. Serpentinite rockserpentinite rocks erpentinite rocks erpentinite rocks erpentinite rockserpentinite rocks erpentinite rocks erpentinite rocks with talc carbonate. Wadi Abu Marawat is cut by several structure elements including folds, faults and shear zones. Metavolcanics and the Banded Iron Formation are intensively folded into anticlines and synclines. The axes of these folds trend in N-S direction and plunge steeply to the north. The limbs of the folds dip to east and west at angles ranging from 60 o to 85o.Abu Marawat area dissected by many faults that trend in different directions. The faults are trending mainly in NW, NNW, NNE and rarely E-W faults. The length of these faults varies from 800 m to about 2000 m. Shear zones shows NW-SE trend. The length of these shear zones varies from 80 m to 1.2 km and thickness from 15 m to 200 m. Petrographically, the serpentinite rocks are composed essentially of antigorite, talc and carbonate minerals. These rocks contain relics of hornblende and little of iron oxides. Talc carbonate is composed of large irregular clusters of carbonates enclosed in a fine groundmass talc, processes. The oxidation of magnetite to martite revealed that the iron ore was affected by weathering processes. The The metavolcanic metavolcanic metavolcanicmetavolcanic rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, rocks are mainly represented by metabasalt, metadolerite, met is composed of plagioclase and olivine. The main accessory minerals are iron oxide and apatite. Carbonate and chlorite are the main secondary minerals. The dolerite is composed mainly of highly altered plagioclase with pyroxene, chlorite and opaque’s. They show medium to fine-grained equigranular fabric. It exhibits doleritic texture. The met -andesiteandesite andesite andesite exhibits a porphyritic texture where porphyroblast of plagioclase embedded in groundmass of cryptocrystalline quartz and fine plagioclase. The main accessory mineral is zircon. Calcite and epidote are secondary minerals. Metadacite usually porphyritic and may have euhedral phenocrysts of quartz and plagioclase. They are mainly composed of quartz, plagioclase and muscovite. The main accessory minerals are zircon, iron oxides and pyrite. Secondary sericite is also observed. The groundmass consists of feldspar and quartz minerals together with granules of mafics and opaques. Petrographically, the older granite can be classified into tonalite and granodiorite rocks. Tonalites are medium to coarse–grained, grey in colour and massive. Tonalites show hypidomorphic texture, composed composed composed composed essentiallyessentially essentially of plagioclase, quartz with subordinate of potash feldspar and biotite. The main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxidesThe main accessory minerals are iron oxidesThe main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxides The main accessory minerals are iron oxidesThe main accessory minerals are iron oxides The main accessory minerals are iron oxides, zircon and allanite. Chlorite, epidote, and muscovite are secondary minerals. Granodiorites are equigranular, medium to coarse-grained rock, pinkish grey to grey in colour and massive. This rock is similar in composition to the tonalite, but differs in being rich in orthoclase, biotite and low in plagioclase and muscovite. Microscopically, granodiorites are composed essentially of quartz, plagioclase and microcline perthite. The main accessory minerals main accessory mineralsmain accessory mineralsmain are sphene and opaques. Muscovite, epidote and chlorite are secondary minerals.