Hassan Mahmoud M, Dessouky Osama K, Al Shammari Abdullah M, Al Barakati Adeeb N, Al Garni Saad M, Al Nahdi Mubark M, Al Qubsani Ashraf N, AlKashghari Wadee A, Nasir Sobhi, Ali Kamal A, Abu El-Enen Mahrous
Geology Department, Suez Canal University, Ismailia, Egypt.
Nuclear Materials Authority of Egypt, P.O. Box 530, El Maadi, Cairo, Egypt.
Sci Rep. 2025 Jan 14;15(1):1904. doi: 10.1038/s41598-024-78570-5.
Recent reconnaissance geochemical investigations have unveiled Cryogenian magmatism linked to the compressional accretionary phase, contributing to the growth of the Afif Terrane in the eastern Arabian Shield. The Cryogenian Suwaj intrusive suite, within the Afif Terrane, displays a compositional range from gabbro-diorite to tonalite-granodiorite. The uniform compositional variation is primarily due to magmatic differentiation within parental magma across multiple pulses. The I-type calc-alkaline Suwaj granitoids represent arc-related juvenile materials resulting from the partial melting of a metabasaltic source. The geochemical characteristics of the Suwaj granitoids suggest typical adakite formation resulting from the melting of the basaltic portion of the young, hot oceanic slab. The age correlation between the Halaban ophiolite and the Suwaj Suite aligns with adakite formation in convergent margins. Tectonically, the Suwaj suite's origin is attributed to the subduction of the Paleo-Ad-Dawadmi oceanic slab during microplate amalgamation, reflecting an integral part of the Arabian-Nubian Shield's evolution, underscoring crustal thickening after arc collision.
近期的勘查地球化学研究揭示了与挤压增生阶段相关的新元古代岩浆活动，这对阿拉伯地盾东部阿菲菲地体的生长起到了促进作用。阿菲菲地体内的新元古代苏瓦伊侵入岩套，其成分范围从辉长闪长岩到英云闪长岩-花岗闪长岩。成分的均匀变化主要是由于母岩浆在多个脉冲过程中的岩浆分异作用。I型钙碱性苏瓦伊花岗岩类代表了由变质玄武岩源部分熔融产生的与弧相关的新生物质。苏瓦伊花岗岩类的地球化学特征表明典型的埃达克岩形成是由年轻、热的大洋板块玄武岩部分熔融所致。哈拉班蛇绿岩与苏瓦伊岩套之间的年龄相关性与汇聚边缘的埃达克岩形成一致。从构造上来说，苏瓦伊岩套的成因归因于微板块拼合过程中古阿德-达瓦德米大洋板块的俯冲，这反映了阿拉伯-努比亚地盾演化的一个组成部分，突出了弧碰撞后的地壳增厚。
