Geochemistry of Soils from the Bosumtwi Impact Structure, Ghana, and Relationship to Radiometric Airborne Geophysical Data
Geochemistry of Soils from the Bosumtwi Impact Structure, Ghana, and Relationship to Radiometric Airborne Geophysical Data
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加纳 Bosumtwi 撞击结构土壤的地球化学及其与辐射航空地球物理数据的关系
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
C. Koeberl
中科院分区：
文献类型：
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作者：
D. Boamah;C. Koeberl
在对博萨姆特维撞击结构进行的高分辨率航空地球物理调查中，在陨石坑边缘周围和陨石坑边缘以北发现了明显的高辐射信号（钾当量浓度高）。在这里，我们报告的主要和微量元素的土壤化学成分的结构，已被调查，以确定来源，源区风化的影响，以及可能的原因，高当量浓度的钾在航空伽玛辐射数据的数据。Bosumtwi是一个年龄为1.07 Ma、直径约10.5 km的撞击坑，位于西非加纳半赤道气候区的早元古代Birimian-Tarkwaian岩石中。该地区是热带雨林环境的一部分，气候温暖，降雨量大，有机活动高，化学风化强烈，导致形成红土，可达数十米厚。
In a high-resolution aerogeophysical survey across the Bosumtwi impact structure, a pronounced high radiometric signal (high equivalent concentration of potassium) was found around the crater rim and to the north of the crater rim. Here we report data on major and trace element chemical compositions of soils from the structure, which have been investigated to determine the provenance, influence of source area weathering, and possible cause of the high equivalent concentration of potassium in the airborne gamma radiation data. Bosumtwi, an impact crater of 1.07 Ma age and a diameter of ~ 10.5 km, is located in early Proterozoic Birimian-Tarkwaian rocks of the semi-equatorial climatic region of Ghana, West Africa. The area forms part of the tropical rainforest environment, where warm climate, high rainfall, and high organic activity prevail, and chemical weathering is intense, leading to the formation of lateritic soils, which can be up to tens of meters thick.