Occurrence of Ishikawaite (Uranium-Rich Samarskite) in the Mineralized Abu Rushied Gneiss, Southeastern Desert, Egypt


MOHAMED FAHMY RASLAN1
Nuclear Materials Authority. P.O. Box, 530, El Maadi, Cairo, Egypt


Abstract
Ishikawaite, with an average assay of about 50% Nb2O5 and 26% UO2 has been identified for the
first time in Egypt in the mineralized Abu Rushied gneissose granite. The mineral is associated with
columbite, Hf-rich zircon, and dark Li-mica mineral (zinnwaldite). The mineralogy and geochemistry
of the studied ishikawaite were determined using microscopic investigation as well as quantitative
analysis by both field emission scanning electron microscope and electron microprobe analyses.
Analytical results indicate a structural formula of (U, Fe, Y, Ca) (Nb, Ta)O4 for the ishikawaite, with
U ranging from 0.12 to 0.61 per formula unit.

المصدر: MOHAMED FAHMY RASLAN International Geology Review, Vol. 50, 2008, p. 1132–1140. DOI: 10.2747/0020-6814.50.12.1132

التحميلات المرفقة

absalman

دكتور / عبدالعاطي بدر سالمان جيولوجي استشاري، مصر [email protected]

  • Currently 80/5 Stars.
  • 1 2 3 4 5
20 تصويتات / 576 مشاهدة
نشرت فى 17 مارس 2011 بواسطة absalman

ساحة النقاش

دكتور: عبدالعاطي بدر سالمان

absalman
Nuclear Education Geology & Development »

ابحث

تسجيل الدخول

عدد زيارات الموقع

1,343,781