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| Neoproterozoic U-Th-REE-bearing Pegmatites in Wadi Ibib, South Eastern Desert, Egypt: Structural and Geochemical Measures for a Syn-Tectonic Anatectic Model of Formation | |
| Ibrahim Waleed S | |
| 来源期刊 | Acta Geologica Sinica
 |
| ISSN | 1000-9515 |
| 出版年 | 2021 |
| 卷号 | 95期号:6页码:2045-2062 |
| 英文摘要 | The Wadi Ibib area is situated in the northern part of the Neoproterozoic Hamisana Shear Zone (HSZ), which is a high strain zone evolved during the late stages of the Pan-African orogeny, likely as a tectonic escape structure. Amphibolite facies pelitic metasedimentary windows crop out in the axial parts of the HSZ and are noticeably associated with numerous N-trending pegmatite dikes. Whole-rock geochemistry of the pegmatites reveals a peraluminous (S-type) affinity, with low K/Rb ratios and elevated concentrations of U, Th, REE, Rb, Li, Cs, Y, Nb and Ta. Structurally, the pegmatite sets intrude along the shear plane of the HSZ, corresponding to the regional N-trending tectonic fabrics, such as axial planar foliation and dextral-shearing in the metasedimentary host rock. Field relationships, including structural context, coupled with geochemical characteristics of the Wadi Ibib pegmatites, do not support their formation as a complementary part of evolved granitic magmas. Space-localized decompression-induced partial melting of peraluminous garnet-bearing metapelites was alternatively the underlying process for formation of these pegmatites. Such decompression was associated with regional escape tectonics and stress axes permutations during the late deformation stage (D3) in the evolution of the south Eastern Desert terrane, due to end-orogeny system pressure-release. |
| 英文关键词 | U-Th-REE mineralization anataxis pegmatite origin Hamisana Shear Zone Wadi Ibib Egypt |
| 类型 | Article |
| 语种 | 英语 |
| 收录类别 | CSCD |
| WOS类目 | Geology |
| CSCD记录号 | CSCD:7116458 |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/377403 |
| 作者单位 | Ibrahim Waleed S, Nuclear Materials Authority, Cairo, Egypt. |
| 推荐引用方式 GB/T 7714 | Ibrahim Waleed S. Neoproterozoic U-Th-REE-bearing Pegmatites in Wadi Ibib, South Eastern Desert, Egypt: Structural and Geochemical Measures for a Syn-Tectonic Anatectic Model of Formation[J],2021,95(6):2045-2062. |
| APA | Ibrahim Waleed S.(2021).Neoproterozoic U-Th-REE-bearing Pegmatites in Wadi Ibib, South Eastern Desert, Egypt: Structural and Geochemical Measures for a Syn-Tectonic Anatectic Model of Formation.Acta Geologica Sinica,95(6),2045-2062. |
| MLA | Ibrahim Waleed S."Neoproterozoic U-Th-REE-bearing Pegmatites in Wadi Ibib, South Eastern Desert, Egypt: Structural and Geochemical Measures for a Syn-Tectonic Anatectic Model of Formation".Acta Geologica Sinica 95.6(2021):2045-2062. |
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