Sedimentological and Geochemical Characteristics of the Sediments West of Al Bauga Area, River Nile State, Sudan

الموضوعات

علوم بحتة وطبيعية

الملخص

The study area lies about 1O0 km north of At bara town in the River NileState, in the central noith of the Eludan, and located between latitudes 18° 00' and1-8° is’ N and longitudes 33° as’ and 33° 57’ E with an extending area about 300kmz. The aim of the study is to determine the sedimentological, geochemical andhydrological characters toclarify the depositional palaeoenvironment. Four surfacevertical profiles were examined in the field and several techniques were appliedincluding grain size ‘analysis, thin sections, X — ray diffraction, infraredspectroscopy, x — ray fluorescence, atomic absorption spectroscopy,-spectrophotometer and water analysis.The lithofacies analysis of the'A1 Bauga sediments reveals seven facies typeson the basis of their lithology, grain size and sedimentary structures. Thedepositional environments are including three different sedimentary faciessequences, fluvio-lacustrine, aeolian and fluvial sediments.Texturally most of the sandstones of A1 Bauga sediments are medium grained,poorly to very poorly sorted, and fne skewed very leptokurtic with unimodal andbimodal size distribution. The grain size parameters coupled with the observedsedimentary structures indicatedthat the sandstones of A1 Bauga sediments havebeen deposited in both fluvial and aeolian environments.The sandstones of Al Bauga sediments are characterized by a highconcentration of SiO2 and are dominantly quartz arenite including a percent ofsuture polycrystalline quartz and epidote which reflects an increased mineralogicalmaturity and indicated metamorphic source rocks. Clays are dominantly detritalkaolinite which suggested tropical humid paleoclimate.The lower part of Al Bauga sediments contains black phytoclast (blackwood) high concentration of Sr and relatively high content of organic matter whichsuggested that these sediments were deposited under oxidizing condition in fluvial— lacustrine environment nearby the source area.The sediments sequence of the Al Bauga sediments is divided into fivegeochemical units using bulk geochemistry, especially those of iron, manganese,calcium and potassium. The unit boundaries are correlated with the significantlithologic boundaries.From the chemical data for groundwaters it is evident that thechemistry of groundwater from the region of Al Bauga sediments is controlled bythe chemical and mineralogical composition of both the basalts and the basementrocks and the waters are medium to high saline. The groundwaters in the Al Baugasediments area show the dominance of Ca+Mg,Na+K cations hydrochemical faciesand HCO3,Cl+CO; anion hydrochemical facies.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0c433352-5a4b-4b4e-a1a6-153334e62724

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

63362_1.pdf, 63362_2.pdf, 63362_3.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Hamed Basher Osman Hamed","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Sedimentological and Geochemical Characteristics of the Sediments West of Al Bauga Area, River Nile State, Sudan

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإعداد

Hamed Basher Osman Hamed

الاقتباسات الببليوغرافية