6. Multi-scale Imaging/Interpretation Methodologies
Aeromagnetic Imaging of Wadi Natash Volcanics, South Eastern Desert, Egypt.
Eslam A. Elawadi
Nuclear Materials Authority, Egypt.
Abstract
Magnetic survey is an efficient technique in locating near surface volcanic rocks expressed mostly by dipolar magnetic anomalies of large amplitude and short wavelength. However, magnetic expression of volcanic rocks is commonly dominated by remanent magnetization that stumbling block the quantitative interpretation. Wadi Natash volcanics are located at the western border of the basement complex of the Eastern Desert of Egypt. They were erupted in the Upper Cretaceous era during the regional uplift associated with the northern Red Sea rifting. These volcanics are basic to acidic composed mainly of olivine basalt, trachyte, and subordinate pyroclastics embedded within the Nubian sandstones. This study attempt to image Natash volcanics buried beneath the sandstones from the aeromagnetic survey data. This approach utilized interpretation techniques that independent of magnetization direction such as Euler deconvolution and analytical signal to estimate body location and depth. The estimated parameters were then used to image the volcanic bodies using modeling techniques.
Last modified: Tue May 23 09:06:07 2006