Geochemical Prospecting For Gold In Umm Saqata-Qala En Nahal Region, Gedarif State, Sudan

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

A loW density stream sediments survey has been conducted in Umm Saqata-Qala En Nahal areas (about 2450 Kmz), Gedarif State — Eastern Sudan. Theaim of the study is to prospect for gold and associated elements using a mostcost and time effective exploration method, in a low grade none exploredPan- African volcano-sedimentary greenstone belt. Geologically UmmSagata-Qala En Nahal areas consist of Ophiolitic Complex, structurallyoverlying a layered sequence of low-grade volcano-sedimentary units. Syn-to late and post-orogenic granitoid complexes intruded the above- mentionedsequences. Two generations of quartz veins have been observed associatedwith syn- and post-orogenic magmatic events.An orientational study has been conducted to determine the optimumfraction (grain size) for sampling in a rich Savana zone. About l2 sampleshave been collected fiom a mineralized locality and sieved for -125 um and— 63 um. Both of the fractions have been analyzed for gold using wetchemical technique with detection limit 2 ppb. Trace elements have beendetermined using Aque- regia - ICP technique. Concentrations of goldmineralization and associated elements are typically found in the finest grainsize fraction (-63 um).The background and threshold values for gold in stream sediments werechosen 9.39 ppb and 45.6 ppb respectively after evaluation of thegeochemical data.As it is the first time to conduct such survey in the study area a number ofgold anomalies" have been recorded. After selecting the right fraction, theUmm Saqata — Qala En Nahal areas have been fully geochemically surveyedat a density of 1 sample per 10 Kmz. A total of 196 samples have so far beencollected fi'om first, second and third order streams of the drainage systemfor low density geochemical survey.The analytical data are evaluated using Univariate Analyses (statisticalparameters, histograms, cumulative frequency curves and geochemicalparameters) and Multivariate Analyses (correlation coefficient, regressionanalysis, factor analysis and cluster analysis).The distribution of gold mineralization in stream sediments is erratic. It isevident that most of the samples with high anomalous content espatiallyoccur in Umm Saqata-Qala En Nahal areas related to the metavolcano-sedimentary sequences which are injected by quartz veins of the firstgeneration. Some localities are clearly structurally controlled as indicated bygold occurrences at or near regional Shear zones along NW — SE trend.positive correlation exists between Au and" trace elements Ag, As, Bi, Cd,Co, Cr, Cu, Fe, Ge, Mn, Nb, Ni, Sb, Se, Sn, Ta, U and W. Correlationbetween Cu, Zn and As may indicate presence of sulphide minerals in streamsediments.

روابط وملفات

التعريف والنوع

رقم الوثيقة

00e37a70-6665-440a-afdd-1928bf0d30f8

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

62916_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"الشيخ محمد عبد الرحمن ","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"محمد عزمي علي حسن","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Geochemical Prospecting For Gold In Umm Saqata-Qala En Nahal Region, Gedarif State, Sudan

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

الشيخ محمد عبد الرحمن

الإعداد

محمد عزمي علي حسن

الاقتباسات الببليوغرافية