Mineralogy of polymetallic mineralized pegmatite of Ras Baroud granite, Central Eastern Desert, Egypt

• RASLAN Mohamed F.

  Nuclear Materials Authority

• EL-SHALL Hassan E.

  University of Florida

• OMAR Sayed A.

  Nuclear Materials Authority

• DAHER Ahmed M.

  Nuclear Materials Authority

抄録

An economically important rare-metal mineralization is recorded in the pegmatite bodies of Gabal Ras Baroud younger granitic pluton, Central Eastern Desert of Egypt. These pegmatite bodies are of variable size and are compositionally zoned. Radiometric measurements of some anomalous pegmatite samples show that their equivalent uranium (eU) content is 219-328 ppm, whereas their equivalent thorium (eTh) content is 783-1101 ppm. On the other hand, the analysis of several separated mineral grains of some pegmatite samples using a scanning electron microscope and X-ray diffraction revealed the presence of several economic minerals. These minerals include zircon, thorite, phlogopite mica, and columbite, in addition to the samarskite-Y mineral. Thorite was found as numerous inclusions of variable size and pattern in zircon. Electron microprobe analysis confirmed the presence of samarskite-Y whose composition corresponds to the empirical formula [(Y_0.49, </i>REE_0.41, Th_0.06</i>, Si_0.05</i>, Ca_0.03, </i>U_0.02</i>, Fe_0.01, Zr_0.00)_Σ1.05(Nb_0.75, Ta_0.17, Ti_0.01)_Σ0.94O₄]. Accordingly, the mineralized Ras Baroud pegmatite can be considered as a promising target ore for its rare-metal mineralization that includes mainly Nb, Ta, Y, U, and REE together with Zr and Th.

収録刊行物

• Journal of Mineralogical and Petrological Sciences

  Journal of Mineralogical and Petrological Sciences 105 (3), 123-134, 2010

  一般社団法人　日本鉱物科学会

キーワード

• Samarskite-Y
• Zircon and thorite inclusions
• Ras Baroud granitic pegmatite
• Eastern Desert
• Egypt

詳細情報

• CRID: 1390001206545071488
• NII論文ID: 10026448957
• NII書誌ID: AA11460926
• DOI: 10.2465/jmps.090201
• ISSN: 13493825
• ISSN: 13456296
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可