El Bahr：一个有前景的撞击坑
El Bahr: A Prospective Impact Crater
摘要：
这一初步调查涉及在埃及Qaret Had El Bahr和Qaret El Allafa之间的撒哈拉沙漠南部发现一个身份不明的陨石坑。这个未经确认的陨石坑（以下暂命名为埃尔巴赫尔陨石坑）是在对撒哈拉沙漠进行地形分析时发现的。埃尔巴赫尔陨石坑位于吉萨西南部，直径约327米，边缘周长约1，027米，表面积约83，981平方米。初步的光谱和地形分析揭示了由地外超高速事件产生的撞击坑的特征，包括碗状边缘和坑壁。然而，从陆地卫星图像上看不到近端和/或远端喷出物。此外，地貌特征，以及已知埃尔巴赫尔玄武岩富含斜方辉石而周围玄武岩不富含斜方辉石的事实，暗示撞击是最合理的解释。在地球撞击数据库中没有对埃尔巴赫尔陨石坑进行索引，对非洲撞击结构的分析也没有将其确定为已证实、拟议或已被否定的撞击坑。因此，与开罗大学合作，组织了一次考察，对El Bahr陨石坑进行现场调查，以确定是否存在平面结构、破碎锥和冲击变质和/或其他陨石性质。
英文摘要：
This preliminary investigation addresses the discovery of an unidentified crater located south of the Sahara Desert between Qaret Had El Bahr and Qaret El Allafa, Egypt. The unidentified crater (hereafter tentatively named El Bahr Crater) was discovered during a terrain analysis of the Sahara Desert. El Bahr Crater is located Southwest Al-Jiza Giza and is approximately 327 meters across, has a rim with a circumference of approximately 1,027 meters, and occupies a surface area of approximately 83,981 square meters. Preliminary spectral and topographic analysis reveal features characteristic of an impact crater produced by a hypervelocity event of extraterrestrial origin, including a bowl-shaped rim and a crater wall. No proximal and/or distal ejecta, however, are visible from Landsat imagery. Moreover, the geomorphic features, along with the fact that the El Bahr basalts are known to be rich in orthopyroxene while the surrounding basalts are not, imply an impact as the most plausible explanation. The El Bahr Crater is not indexed in the Earth Impact Database, and an analysis of impact structures in Africa did not identify it as either a confirmed, proposed or disproved impact crater. In collaboration with the University of Cairo, therefore, an expedition has been organized to conduct an in-situ investigation of El Bahr Crater, to ascertain if planar formations, shatter cones, and shock metamorphic and or other meteoritic properties are present.
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