Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1016/j.jafrearsci.2020.103768 |
| The role of post-collisional mafic magmatism in the late stages of evolution of the northernmost Arabian-Nubian Shield (ANS): A case study from Isla Complex, Wadi Isla, South Sinai, Egypt | |
| Ragab, Azza | |
| 通讯作者 | Ragab, Azza |
| 来源期刊 | JOURNAL OF AFRICAN EARTH SCIENCES
 |
| ISSN | 1464-343X |
| EISSN | 1879-1956 |
| 出版年 | 2020 |
| 卷号 | 164 |
| 英文摘要 | Isla complex is one of the late Neoproterozoic igneous complexes of the Arabian-Nubian Shield in southern Sinai. This research aims to examine the petrogenesis and tectonic setting of Isla complex, as well as inferring the P-T conditions of the parent magma and the depth of intrusion. A detailed field studies were carried out and representative samples for petrographic and geochemical studies were collected. Chemical analyses of major and trace elements for 18 samples and microprobe analyses for different mineral phases in olivine gabbro were performed. The Isla complex is distinguished into olivine gabbro, diorite and monzonite. The interrelationships between certain oxides and/or oxide ratios point to the important role of fractional crystallization process during the formation of the studied complex and the evolution of its mafic-intermediate rock units. The major fractionated phases were clinopyroxene, amphibole and plagioclase. The analyzed rocks show a gradual decrease in concentration of HFSE from olivine gabbro to monzonite via diorite suggesting overall co-magmatic origin. The low K content in plagioclase and low and constant Y/Nb, Nb/Zr, and K/Nb ratios in gabbroic rock relative diorites and monzonites suggest that during the formation of more evolved rock units, the crustal contamination process became more important. The rock varieties of the Isla complex are fresh and not deformed indicating post-collisional emplacement. The geochemical affinity of Isla complex is analogous to other within-plate postcollisional mafic magmatism of south Sinai. The subduction-related geochemical signature of the examined rocks can be interpreted by partial melting of an enriched lithospheric mantle source following an earlier subduction stage in the ANS. Based on hornblende-plagioclase thermometry, the gabbroic rocks of the Isla complex crystallized at a pressure of 5.5 kbar (similar to 20 km depth), the crystallization temperature was estimated at 823 to 967 degrees C. The model of lithospheric delamination is supposed to form the studied melt since the delamination of the lithospheric mantle caused the asthenosphere to rise rapidly initiating partial melting and creating the studied gabbroic melt, followed by the fractionation of this melt to form different rock varieties of the Isla complex. The melts then penetrated the crusts base to create the Isla complex in southern Sinai. The estimated age of crystallization and emplacement of the examined complex is < 590-610 Ma, as it invades the old calc-alkaline granites. |
| 英文关键词 | Arabian-Nubian Shield Olivine gabbro Lithospheric delamination Post-collisional Petrogenesis South Sinai |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Egypt |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000526109500007 |
| WOS关键词 | VOLCANO-SEDIMENTARY SUCCESSIONS ; KATERINA RING COMPLEX ; RED-SEA HILLS ; EASTERN DESERT ; CALC-ALKALINE ; MINERAL CHEMISTRY ; HORNBLENDE GABBRO ; CRUSTAL EVOLUTION ; IGNEOUS COMPLEX ; PHASE-RELATIONS |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS研究方向 | Geology |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/314841 |
| 作者单位 | Mansoura Univ, Fac Sci, Geol Dept, Mansoura 35516, Egypt |
| 推荐引用方式 GB/T 7714 | Ragab, Azza. The role of post-collisional mafic magmatism in the late stages of evolution of the northernmost Arabian-Nubian Shield (ANS): A case study from Isla Complex, Wadi Isla, South Sinai, Egypt[J],2020,164. |
| APA | Ragab, Azza.(2020).The role of post-collisional mafic magmatism in the late stages of evolution of the northernmost Arabian-Nubian Shield (ANS): A case study from Isla Complex, Wadi Isla, South Sinai, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,164. |
| MLA | Ragab, Azza."The role of post-collisional mafic magmatism in the late stages of evolution of the northernmost Arabian-Nubian Shield (ANS): A case study from Isla Complex, Wadi Isla, South Sinai, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 164(2020). |
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