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| DOI | 10.1017/S0016756818000304 |
| Geochemistry, age and origin of the Mons Claudianus TTG batholith (Egypt): insight into the role of Pan-African magmatism in uniting plates of Gondwana | |
| Abdel-Rahman, Abdel-Fattah M. | |
| 通讯作者 | Abdel-Rahman, Abdel-Fattah M. |
| 来源期刊 | GEOLOGICAL MAGAZINE
 |
| ISSN | 0016-7568 |
| EISSN | 1469-5081 |
| 出版年 | 2019 |
| 卷号 | 156期号:6页码:969-988 |
| 英文摘要 | The tonalite-trondhjemite-granodiorite (TTG) Mons Claudianus Batholith (MCB) of Egypt is subsolvus, metaluminous to mildly peraluminous, exhibits wide ranges of SiO2, Al2O3, Sr, Rb, Zr, shows large Ba enrichment, is moderately enriched in rare earth elements (REE) and is depleted in K, Ti, Nb, Y, Hf and heavy REE (HREE), reflecting strong arc geochemical signatures. Moderate fractionation of REE and lack of Eu anomaly characterize the MCB. It is typical of high-Al TTGs of volcanic-arc affinities. U-Pb-zircon dating produced a Pan-African age of 664.12 +/- 0.38 Ma. The MCB exhibits Sr-87/Sr-86 isotopic compositions of 0.70352-0.70626 (initial Sr ratio of 0.70259) and Nd-143/Nd-144 ratios of 0.51261-0.51276 (epsilon(Nd); -0.5 to +2.4), suggestive of a mantle source. Anatexis of a basaltic slab under eclogitic conditions leaving garnet in the residue produces high-Al TTG rocks characterized by low Yb values (<1.8 ppm). Values (in ppm) of Yb (0.65-1.8), Y (2.2-19), Nb (1.2-6.4), and ratios of Nb/Ta (7-17), (La/Yb)(N) of 11.7, Sr/Y and Zr/Sm (58 and 45, respectively) are all consistent with anatexis of a basaltic slab under eclogitic conditions, leaving garnet in the residue to produce this high-Al TTG suite. The data conform to magma generation via partial melting (F = 0.25-0.50) leaving 15-25 % garnet in the residue. Voluminous synorogenic magmatic pulses, resulting from slab melting during the closure of the Mozambique Ocean via convergence of east and west Gondwana, produced the MCB and similar large batholiths forming the core of Pan-African belts. These belts welded together vestiges of fragmented Rodinia, assembling them into a united Gondwana. |
| 英文关键词 | Gondwana assembly Mons Claudianus TTG batholiths petrogenesis REE and Sr-Nd isotope geochemistry U-Pb-zircon Pan-African age |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Lebanon |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000466534300003 |
| WOS关键词 | EARLY CONTINENTAL-CRUST ; EASTERN DESERT ; TONALITE-TRONDHJEMITE ; CARAJAS PROVINCE ; EXPERIMENTAL CONSTRAINTS ; ZIRCON GEOCHRONOLOGY ; AVALON TERRANE ; RING COMPLEXES ; NUBIAN SHIELD ; PETROGENESIS |
| 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/2XILL650/215968 |
| 作者单位 | Amer Univ Beirut, Dept Geol, POB 11-0236,Bliss St, Beirut, Lebanon |
| 推荐引用方式 GB/T 7714 | Abdel-Rahman, Abdel-Fattah M.. Geochemistry, age and origin of the Mons Claudianus TTG batholith (Egypt): insight into the role of Pan-African magmatism in uniting plates of Gondwana[J],2019,156(6):969-988. |
| APA | Abdel-Rahman, Abdel-Fattah M..(2019).Geochemistry, age and origin of the Mons Claudianus TTG batholith (Egypt): insight into the role of Pan-African magmatism in uniting plates of Gondwana.GEOLOGICAL MAGAZINE,156(6),969-988. |
| MLA | Abdel-Rahman, Abdel-Fattah M.."Geochemistry, age and origin of the Mons Claudianus TTG batholith (Egypt): insight into the role of Pan-African magmatism in uniting plates of Gondwana".GEOLOGICAL MAGAZINE 156.6(2019):969-988. |
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