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2013 |
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Secondary processes affected alpine ultramfic associated ore bodies, Ingessana hills, SE-Sudan Mohmed Ali NW, El Sammani Y., Abdel Rahman EM., Sulieman M., Ibrahim A. The geological research Authority of the Sudan. Po.Box.410Khartoum, Sudan.
Alpine orogeny as an integrated part of the Wilson Cycle, marked by the closure and collapse of a basin and the intrusion of ophiolite at the culmination of orogeny casted structures, mineral composition, and the precipitation of economic ore deposits. Structures inherited are rotative kinematic indicators formed as a result of multiple phase green schist facies strike slip movement that resulted in many rotative structures, as; podiform, boudinage, duplex, snow ball porphyroblasts, anastomosed features', pull a part structures, and lenses. By necessity these movements results in displacement in different degrees as sinistral and dextral. This process is quite obvious in the chromite bodies and pose problems for their exploration phase for it is difficult to the next chromite lens, the same encountered the exploration in quartz veins that characterized by Reidel Shear. Under greenschist conditions a huge amount of metamorphic hydrothermal water formed as a result of degree of deformation and metamorphism. AS a result of metasomatic reactions water rock interaction with the dunite Mg-rich cumulate magnesite, asbestos, talc, serpentine were formed at these conditions. The formation of these ultramafic ore deposits associated with fractures and deformations associated with greenschist facies metamorphism. The same minerals multiple remobilization that would also include chromite. | ||||
