Arid
DOI10.1007/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
ISSN1866-7511
EISSN1866-7538
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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