Evolution of the Arabian-Nubian Shield in Gabal Samra area, Sinai; implications from zircon U-Pb geochronology

被引：12
|
作者：
Mansour, Sherif [1 ]
Hasebe, Noriko [2 ]
Meert, Joseph G. [3 ]
Tamura, Akihiro [4 ]
Khalaf, Fikry I. [1 ]
El-Shafei, Mohamed K. [5 ]
机构：
[1] Port Said Univ, Fac Sci, Geol Dept, Port Said 42522, Egypt
[2] Kanazawa Univ, Inst Nat & Environm Technol, Kanazawa 9201192, Japan
[3] Univ Florida, Dept Earth & Planetary Sci, Gainesville, FL USA
[4] Kanazawa Univ, Dept Earth Sci, Kanazawa 9201192, Japan
[5] Suez Canal Univ, Fac Sci, Geol Dept, Ismailia, Egypt
来源：
JOURNAL OF AFRICAN EARTH SCIENCES | 2022年 / 192卷
关键词：
U-Pb zircon; Sinai peninsula; Arabian-Nubian shield; Pan-African; East Africa orogen; PLASMA-MASS SPECTROMETRY; EAST-AFRICAN OROGEN; PRECAMBRIAN CRUSTAL EVOLUTION; NEOPROTEROZOIC GRANITOIDS; TECTONIC EVOLUTION; CALC-ALKALINE; ICP-MS; DESERT; EGYPT; GONDWANA;
D O I：
10.1016/j.jafrearsci.2022.104538
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The basement complex of Sinai represents the northern end of the Arabian-Nubian Shield that formed as part of the East African Orogen. Our study focuses on the genesis and development of the crystalline rocks in the Gabal Samra area, Sinai, Egypt, using LA-ICP-MS zircon U-Pb dating. We delineate three distinct magmatic pulses including: 1) island arc (ca. 871-804 Ma) magmatic activity represented by the Baba metamorphic belt; 2) syn-tectonic (ca. 753-733 Ma) magmatic activity represented by calc-alkaline and alkaline granitic rocks, and; 3) post-tectonic (ca. 622-535 Ma) magmatic activity represented by dykes, calc-alkaline and alkaline granitic rocks. We found limited evidence for pre-Neoproterozoic basement involvement in the study area except for several xenocrysts with ages of 2123 +/- 17, 1808 +/- 17, 1740 +/- 20, 1256 +/- 18, and 972 +/- 14 Ma. Younger zircon grains yield ages ranges between 509 +/- 11 and 469 +/- 8 Ma, which indicate younger magmatic events in the region.
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页数：16
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