Geochemistry of the Um Had Plutonites, Central Eastern Desert, Egypt: Implications for Magma Evolution, and Tectonic Setting

Qaoud, Nedal (2014) Geochemistry of the Um Had Plutonites, Central Eastern Desert, Egypt: Implications for Magma Evolution, and Tectonic Setting. Journal of Geography and Geology, 6 (2). pp. 36-46. ISSN 1916-9779

[thumbnail of 33288-123245-1-PB.pdf] Text
33288-123245-1-PB.pdf - Published Version

Download (606kB)

Abstract

Geochemistry of gabbroid and granitoid plutonites from the Um Had area indicates island arc subalkaline basic magma with tholeiitic affinity and calc-alkaline, metaluminous and slightly peraluminous magma, respectively. Although different in age both plutonite types were emplaced under compressional regime, where subduction-related environment was dominant. They were formed under relatively low to moderate water-vapour pressure (1–5 k-bars) at moderate depths (20–30 km). Biotite granites were formed at a relatively high temperature range (800–840 °C), while biotite-muscovite granites were formed under relatively moderate temperature conditions (760–800 °C). These two units may represent evolution from island arc to active continental margin. It is suggested that island arc gabbros might have sourced the late subduction-related calc-alkaline granitoids during the waning stages of the pan-African orogeny. The I-type nature of the investigated plutonites in the study area and elsewhere suggests the juvenile character of the basement complex of the Eastern Desert of Egypt.

Item Type: Article
Subjects: Librbary Digital > Geological Science
Depositing User: Unnamed user with email support@librbarydigit.com
Date Deposited: 10 Jun 2023 06:37
Last Modified: 25 Aug 2025 03:46
URI: http://index.go2articles.com/id/eprint/903

Actions (login required)

View Item
View Item