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Volume :11 Issue : 2 1984      Add To Cart                                                                    Download

On the occurrence and genesis of mud zircon in the radioactive psammitic gneiss of Wadi Nugrus, Eastern Desert, Egypt

Auther : MAHMOUD A. EL-GEMMIZI

Nuclear Materials Corporation, Atomic Energy Post Office. Cairo, Egypt

 

ABSTRACT

 

A unique type of zircon occurs in the radioactive part of the psammitic gneiss which is the basal unit of the metamorphic rock succession in the Wadi Nugrus area, Eastern Desert of Egypt. This radioactive part is enriched in Zr, Nb, Sn and Pb and depleted in Ti, in comparison to the non-radioactive part of the rock. This enrichment is due to metasomatic alteration which acted on the rock and led to the concentration of the relatively rare elements in the upper part. Zircon particles in the radioactive part show pronounced increase in grain size, overgrowth, outgrowth, crystal aggregation and multiple growth. These features resulted from the addition of zirconium transported by the metasomatising agents from the underlying part of the rock. On to both the pre-existing zircon and the newly formed crystals. The most abundant habit of zircon shows well-developed bipyramidal faces at the expense of the prismatic faces which are generally reduced or absent. In contrast. zircon in the non-radioactive gneiss (lower part) is of the prismatic bipyramidal type but is corroded and bleached, reflecting the effect of dissolution by the metasomatising agents. This indicates that zircon was leached out from this part of the rock and added to the upper part by the rising rnetasomatic agents. The bearing of this study on the genesis of the psammitic gneiss is discussed.

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