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| Geologic relationships and mineralization of peralkaline/alkaline granite-syenite of the Zargat Na' am ring complex, Southeastern Desert, Egypt | |
| Saleh, Gehad M. | |
| 通讯作者 | Saleh, GM |
| 来源期刊 | ACTA GEOCHIMICA
 |
| ISSN | 2096-0956 |
| EISSN | 2365-7499 |
| 出版年 | 2006 |
| 卷号 | 25期号:2页码:97-111 |
| 英文摘要 | The Zargat Na' am ring complex crops out 90 km NW of Shalatin City in the Southeastern Desert of Egypt. The ring complex forms a prominent ridge standing high above the surrounding mafic-ultramafic hills. It is cut by two sets of joints and faults which strike predominantly NNW-SSE and E-W, and is injected by dikes, porphyritic alkaline syenites, and felsite porphyries. It consists of alkali syenites, alkali quartz syenites, and peralkaline arfvedsonite-bearing granitic and pegmatitic dikes and sills. The complex is characterized locally by extreme enrichments in REEs, wolframite and rare, high field strength metals (HFSM), such as Zr and Nb. The highest concentrations (1.5 wt% Zr, 0.25 wt% Nb, 0.6 wt% Sigma REEs) occur in aegirine-albite aplites that formed around arfvedsonite pegmatites. Quartz-hosted melt inclusions in arfvedsonite granite and pegmatite provide unequivocal evidence that the peralkaline compositions and rare metal enrichments are primary magmatic features. Glass inclusions in quartz crystals also have high concentrations of incompatible trace elements including Nb (750 x 10(-6)), Zr (2500 x 10(-6)) and REEs (1450 x 10(-6)). The REEs, Nb and Zr compositions of the aegirine-albite aplites plot along the same linear enrichment trends as the melt inclusions, and Y/Ho ratios mostly display unfractionated, near-chondritic values. The chemical and textural features of the aegirine-albite aplites are apparently resultant from rapid crystallization after volatile loss from a residual peralkaline granitic melt similar in composition to the melt inclusions. |
| 英文关键词 | geologicr elationship mineralization of peralkaline/alkaline granite-syenite Zargat Na' am ring complex Southeastern Desert Egypt |
| 类型 | Article |
| 语种 | 英语 |
| 收录类别 | ESCI |
| WOS记录号 | WOS:000218239200001 |
| WOS类目 | Geochemistry & Geophysics |
| WOS研究方向 | Geochemistry & Geophysics |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/328774 |
| 作者单位 | [Saleh, Gehad M.] Nucl Mat Author, POB 530, Cairo, Egypt |
| 推荐引用方式 GB/T 7714 | Saleh, Gehad M.. Geologic relationships and mineralization of peralkaline/alkaline granite-syenite of the Zargat Na' am ring complex, Southeastern Desert, Egypt[J],2006,25(2):97-111. |
| APA | Saleh, Gehad M..(2006).Geologic relationships and mineralization of peralkaline/alkaline granite-syenite of the Zargat Na' am ring complex, Southeastern Desert, Egypt.ACTA GEOCHIMICA,25(2),97-111. |
| MLA | Saleh, Gehad M.."Geologic relationships and mineralization of peralkaline/alkaline granite-syenite of the Zargat Na' am ring complex, Southeastern Desert, Egypt".ACTA GEOCHIMICA 25.2(2006):97-111. |
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