US-Egypt Cooperative Research: Spectral Analysis of Aeromagnetic Data for Geothermal Reconnaissance of West of the Red Sea Region in Egypt

0608650 Ravat描述： 该奖项旨在支持位于伊利诺伊州卡本代尔的南伊利诺伊大学（SIU）地质系Dhananjay Ravat博士和位于埃及马迪的埃及核材料管理局Ahmed Salem博士的合作研究。 他们计划分析沿着红海裂谷的埃及东部沙漠的磁场异常数据，以得出磁性层底部深度和居里温度的变化，从而评估该地区的地热潜力。长期以来，磁场异常的频谱分析被用来确定磁源顶部和底部的深度。早期的方法是基于随机源分布的假设，这在当时被认为是合理的。这些方法最近已被修订，以包括更现实的分形源的几何形状。PI和其他人最近发现，这些方法在分析厚地壳层和差异大的层时存在其他局限性。 虽然在本研究中，目前的方法将足以确定沿红海沿着约100公里区域的磁性厚度，因为那里的磁源预计很薄，但这些方法需要作一些修改，以便能够用于延伸到地壳深处、远离裂谷的磁性单元。 研究结果的修改将使人们能够分析埃及东部沙漠的大部分磁异常数据，包括磁源底部的深度、居里温度深度和该地区地壳的温度变化。根据最近的研究，确定到磁性层底部的深度的现有谱磁性方法在某些情况下可能是不充分的。这项研究将开发新的方法或修改旧的方法，以克服在估计深度的厚层和地质来源与大深度变化的局限性。更广泛的影响：由于世界各地的大量研究人员正在使用目前的方法，被认为是在某些情况下不足，一个改进的方法将有助于更好地估计居里深度的变化和更好地评估地热潜力。研究中制定的方法将提供给全世界。另一个影响是加强了两个有关组织之间的联系以及今后的交流和研究。另一个重要影响是本科生、研究生和博士后研究人员的培训和发展，该项目得到美国-埃及联合基金方案的支持，该方案向两国的科学家和工程师提供赠款，以开展这些合作活动。

0608650RavatDescription: This award is to support a cooperative research by Dr. Dhananjay Ravat, Department of Geology, Southern Illinois University (SIU), Carbondale, Illinois and Dr. Ahmed Salem, Nuclear Materials Authority of Egypt, Maadi, Egypt. They plan to analyze magnetic field anomaly data from the Eastern Desert of Egypt along the Red Sea rift to derive the variation in the bottom depth of the magnetic layer and Curie temperatures in order to assess the geothermal potential of the region. Spectral analyses of magnetic field anomalies have long been used to determine the depth to the top and bottom of magnetic sources. The early methods were based on an assumption of random source distributions which was thought reasonable at that time. These methods have been recently revised to include more realistic fractal source geometries. Additional limitations of these methods for analyzing thick crustal layers and layers with large variance were recently discovered by the PI and others. While, in the present study, the current methods will work adequately to define the magnetic thickness in a region with a swath of about 100 km along the Red Sea because the magnetic sources over there are expected to be thin, these methods will require some modification so that they can be used on magnetic units extending in the deep crust, away from the rift. The modifications resulting from the research will allow analysis of much of the magnetic anomaly data from the Eastern Desert of Egypt in terms of the depth to the bottom of the magnetic sources, Curie temperature depths and the temperature variation in the crust in the region.Intellectual Merit: In the light of the recent research, the present spectral magnetic methods of determining the depth to the bottom of the magnetic layers may be inadequate in certain situations. This study will either develop new methods or modify old methods to overcome the limitations in estimating depths from thick layers and geologic sources with large depth variance.Broader Impact: Since a large number of researchers around the world are using the present methods which are deemed inadequate in certain situations, an improved methodology will help better estimation of the variation of the Curie depth and better assessment of geothermal potential. The methods developed in the study will be available to the worldwide community. Another impact is strengthening of ties between the two organizations involved and future exchange and research. An additional important impact is training and development of undergraduate and graduate students and post-doctoral researchers.This project is being supported under the US-Egypt Joint Fund Program, which provides grants to scientists and engineers in both countries to carry out these cooperative activities.