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| DOI | 10.1007/s11631-007-0333-y |
| Geology and rare-earth element geochemistry of highly evolved, molybdenite-bearing granitic plutons, 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 | 2007 |
| 卷号 | 26期号:4页码:333-344 |
| 英文摘要 | The field relations, mineralogy, and major and trace elements (including REE analyses of whole-rock samples and minerals) of granites and their associated molybdenite + uranium mineralized aplites in Southeastern Desert, Egypt, have been studied. The granites are leucocratic and mostly peraluminous in nature with muscovite increasing at the expense of biotite. The chemical and mineralogical characteristics of the granitic rocks indicate that their melts originated from the LILE-enriched mantle wedge by partial melting and are contaminated by crustal melts, followed by thermogravitational processes. Leucogranites with higher Na2O/K2O ratios from Um Dargag and Um Maiat crystallized under H2O-saturated equilibrium conditions in which the exsolved vapor continuously migrated away. The REE patterns of the granites studied are characterized by LREE enrichments and negative Eu anomalies. In comparison, the potassic aplites and the more sodic leucogranites are depleted in LREE, enriched in HREE and show more remarkable negative Eu anomalies. Allanite and monazite are the most important REE carriers in the granites. These minerals are strongly enriched in LREE, whereas fluorite and xenotime, which are more abundant in the aplites, are enriched in HREE. The average Lu/Ce ratio represents the fractionation trend with respect to HREE. It is 0.71 for radioactive fluorite, and it increases to 1.22 for non-radioactive fluorite. The high REE contents of molybdenite represent re-deposition of the mobilized Mo and REE. Due to the strong control of accessory minerals, the REEs are of limited use in petrogenetic modelling of highly evolved granitic systems. |
| 英文关键词 | major and trace elements molybdenite allanite monazite Um Dargag and Um Maiat Southeastern Desert Egypt |
| 类型 | Article |
| 语种 | 英语 |
| 收录类别 | ESCI |
| WOS记录号 | WOS:000218272700001 |
| WOS关键词 | PARTITION-COEFFICIENTS ; TRACE-ELEMENTS ; DIFFERENTIATION ; FRACTIONATION |
| 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/2XILL650/328916 |
| 作者单位 | [Saleh, Gehad M.] Nucl Mat Author, POB 530, El Maadi 530, Egypt |
| 推荐引用方式 GB/T 7714 | Saleh, Gehad M.. Geology and rare-earth element geochemistry of highly evolved, molybdenite-bearing granitic plutons, Southeastern Desert, Egypt[J],2007,26(4):333-344. |
| APA | Saleh, Gehad M..(2007).Geology and rare-earth element geochemistry of highly evolved, molybdenite-bearing granitic plutons, Southeastern Desert, Egypt.ACTA GEOCHIMICA,26(4),333-344. |
| MLA | Saleh, Gehad M.."Geology and rare-earth element geochemistry of highly evolved, molybdenite-bearing granitic plutons, Southeastern Desert, Egypt".ACTA GEOCHIMICA 26.4(2007):333-344. |
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