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| DOI | 10.1007/s12517-018-4206-y |
| Metamorphic evolution of Pan-African Wadi El Miyah Metasediments, Central Eastern Desert, Egypt: a distinctive LP/HT metapelitic sequence from the northern Arabian-Nubian Shield | |
| Shallaly, Nahla A. | |
| 通讯作者 | Shallaly, Nahla A. |
| 来源期刊 | ARABIAN JOURNAL OF GEOSCIENCES
 |
| ISSN | 1866-7511 |
| EISSN | 1866-7538 |
| 出版年 | 2019 |
| 卷号 | 12期号:2 |
| 英文摘要 | The meta-volcanosedimentary sequence from the SW sector of Wadi El Miyah area constitutes an example of the Late Proterozoic Pan African supracrustal rocks exposed in the Central Eastern Desert of Egypt. This folded meta-volcanosedimentary sequence is juxtaposed along about 8-km-long WNW-ESE-trending thrust contacts with a highly foliated ophiolitic m,lange comprising serpentinites, metagabbros and quarztofeldspathic blocks and intruded by a gneissose hornblende diorite. Chaistolite-bearing mica schists crop out in three compositionally different metamorphic zones, marked by garnet, andalusite, and staurolite porphyroblasts, respectively. Microstructural data combined with careful mapping indicate that the studied metapelites were subjected to three deformational phases, D-1-D-3, each having its own impact on the development of planar and linear structures. These rocks witness the coexistence of a less ubiquitous dextral sense of shear and a later sinistral one that correspond to the D-2-thrusting and D-3-related phases, respectively. Geothermobarometry of the garnet-bearing assemblages combined with Th-U-Pb dating of metamorphic monazite by an electron microprobe indicates a counter-clockwise P-T-t path with a thermal peak assemblage of garnet + staurolite + chiastolite +/- fibrolitic sillimanite at 622 A degrees C/4.1 kbars during the D-2 phase, with an age around 640-658 Ma. This is concordant with the ages assigned for the arc accretion phase in the Nubian Shield. The determined counter-clockwise P-T-t path of the studied rocks suggests that such a Buchan-type LP/HT sequence may be considered as a typical example of a regional-contact metamorphism which formed in areas that suffer from crustal thickening accompanied by emplacement of granitoids that affected the geothermal gradient of the crust. |
| 英文关键词 | LP/HT metapelites Pan-African P-T-t path Regional-contact metamorphism EMP monazite dating |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Egypt |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000456879800003 |
| WOS关键词 | NAJD FAULT SYSTEM ; CORE COMPLEX ; SAUDI-ARABIA ; SYMPLECTIC INTERGROWTHS ; TECTONIC EVOLUTION ; SHEAR SYSTEM ; MICROPROBE ; MONAZITE ; BELT ; BIOTITE |
| 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/2XILL650/214307 |
| 作者单位 | Cairo Univ, Giza, Egypt |
| 推荐引用方式 GB/T 7714 | Shallaly, Nahla A.. Metamorphic evolution of Pan-African Wadi El Miyah Metasediments, Central Eastern Desert, Egypt: a distinctive LP/HT metapelitic sequence from the northern Arabian-Nubian Shield[J],2019,12(2). |
| APA | Shallaly, Nahla A..(2019).Metamorphic evolution of Pan-African Wadi El Miyah Metasediments, Central Eastern Desert, Egypt: a distinctive LP/HT metapelitic sequence from the northern Arabian-Nubian Shield.ARABIAN JOURNAL OF GEOSCIENCES,12(2). |
| MLA | Shallaly, Nahla A.."Metamorphic evolution of Pan-African Wadi El Miyah Metasediments, Central Eastern Desert, Egypt: a distinctive LP/HT metapelitic sequence from the northern Arabian-Nubian Shield".ARABIAN JOURNAL OF GEOSCIENCES 12.2(2019). |
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