The Geology and Geochemical Characteristics of Elgaab Shear Related-Gold Mineralization, West of the Nile, North Sudan
| المصدر: | مجلة جامعة دنقلا للبحوث العلمية |
|---|---|
| الناشر: | جامعة دنقلا - كلية الدراسات العليا |
| المؤلف الرئيسي: | M. Ali, Mohamed Osman Elgizouli (Author) |
| المجلد/العدد: | مج11, ع21 |
| محكمة: | نعم |
| الدولة: |
السودان |
| التاريخ الميلادي: |
2021
|
| الشهر: | يونيو |
| الصفحات: | 1 - 15 |
| رقم MD: | 1310293 |
| نوع المحتوى: | بحوث ومقالات |
| اللغة: | الإنجليزية |
| قواعد المعلومات: | EduSearch, HumanIndex |
| مواضيع: | |
| كلمات المؤلف المفتاحية: |
Shear Zones Related Gold Mineralization | North Sudan
|
| رابط المحتوى: |
عدد مرات التحميل
1
| المستخلص: |
The study area occupies the Eastern edge of the Sahara Craton NE-Sudan. Elgaab Shear zone representing the SW extension of the NNE Delgo - Atmur suture east of the Nile, North Sudan. This extends down to Sodri- Um Badir shear zones in Northern Kurdofan. The geology of study area consists of quartzo-felspathic gneisses, ophiolite complexes of late Proterozoic age, meta-sedimentary group, meta-volcanics and volcano sedimentary sequences of Neo-Proterozoic age. These have been intruded by Syn-to late-orogenic granitoidal intrusions mainly diorite, and partially covered by Phanerozoic sediments. Three new stratigraphic units described for the first time in Elgaab area, namely: glacial sediments (tillite), Paleozoic sandstone and ophiolite complexes. The gold bearing quartz veins developed mainly filling fractures of foliation planes of the volcano sedimentary sequences of green schist facies, This is believed to have formed during Pan-African Orogenic events (~ 900 - 550 Ma. ago). The assay results of gold and associated minerals Cu, Pb, Zn and As beside Cr and Ni, indicate that the gold content in soil samples shows anomalous values (0.18 - 8.391 g/t,) higher than those obtained from quartz veins which were (0.053 up to 2.93) and trenches samples (0.5 to 0.8 ppm). Arsenic content display the highest values (60 -73000 ppm). Cu (32 - 337 ppm), Pb (19 to 253 ppm), Zn (16 to 880 ppm), Ni (47 and 299 ppm), and Cr (160 - 1570 ppm). Single elements geochemical mapping "Iso-concentrate map" used as effective tools assigning the areas of anomalous value as well as the trend of mineralization. The geological, lithological structural criteria and geochemical mapping indicate that the mineralization zone is confined to the shear zone usually trending NNESSW and shear-related tensional gashes. Thus, Elgaab gold mineralization could be classified as shear-related hypo-thermal gold mineralization. |
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