A possible new impact structure in the Okavango Delta, Botswana

被引：2
|
作者：
Cooper G.R.J. [1 ]
Webb S.J. [1 ]
Gibson R.L. [1 ,2 ]
Martinez I. [3 ]
机构：
[1] School of Geosciences, University of the Witwatersrand, Johannesburg 2050, Private Bag 3, PO WITS
[2] Impact Cratering Research Group, School of Geosciences, University of the Witwatersrand, Johannesburg 2050, Private Bag 3, PO WITS
[3] Tsodilo Resources Ltd., Box 508, Toronto, ON M5J 2SI
来源：
Special Paper of the Geological Society of America | 2010年 / 465卷
关键词：
D O I：
10.1130/2010.2465(13)
中图分类号：
学科分类号：
摘要：
Aeromagnetic data reveal a possible 15-20 km wide impact structure in the Okavango Delta, Botswana. The identified structure is located at 19°07′40.0″S, 23°18′12.7″E, and it is marked by a circular region of subdued magnetic intensity ∼18 km across with a central magnetic peak. It does not appear to be visible in either Google Earth imagery or Shuttle Radar Topography Mission (SRTM) topographic data, and gravity data are too sparse in this region to image the structure. The regional magnetic fabric continues through the anomaly. The central magnetic peak has an amplitude of >700 nT. Modeling of the magnetic data indicates that the structure might be buried beneath ∼200-500 m of sediments, and it has a magnetically modeled central uplift that is ∼5 km wide. © 2010 The Geological Society of America. All rights reserved.
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页码：191 / 199
页数：8
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