Updated tectonic terrane boundaries of Botswana determined from gravity and aeromagnetic data

被引:8
作者
Chisenga, Chikondi [1 ,2 ]
Yan Jianguo [1 ]
Fadel, Islam [3 ]
van der Meijde, Mark [3 ]
Atekwana, Estella A. [4 ]
机构
[1] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, Box 129,Luoyu Rd, Wuhan, Peoples R China
[2] Malawi Univ Sci & Technol, Dept Earth Sci, Ndata Sch Climate & Earth Sci, POB 5196, Limbe, Malawi
[3] Univ Twente, Fac Geoinformat Sci & Earth Observat ITC, POB 217, NL-7500 AE Enschede, Netherlands
[4] Univ Delaware, Coll Earth Ocean & Environm, Dept Earth Sci, Delaware, DE USA
来源
EPISODES | 2020年 / 43卷 / 04期
关键词
GHANZI-CHOBE BELT; LIMPOPO BELT; GEOPHYSICAL EXPLORATION; SOUTHERN AFRICA; COMPLEX; EVOLUTION; KALAHARI; ZIRCON; CRATON; MINERALIZATION;
D O I
10.18814/epiiugs/2020/020054
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We used existing high-resolution gravity and aeromagnetic data to map the crustal units underneath Botswana. The thick sedimentary cover in this region has always been a challenge to understand the geological and tectonic configuration of unexposed crustal terranes using traditional geological methods. We utilized a standard physical mapping technique to convert previously obtained gravity and aeromagnetic data into apparent density and magnetic susceptibility maps, respectively, of the crustal tectonic terranes. Then, the derived maps were fused into a single apparent physical map to facilitate its geotectonic interpretation. The results showed that most of the tectonic boundaries were inaccurately mapped due to limited availability of high-resolution geophysical information. Moreover, we found that some terranes were missing from the current tectonic map. We used the apparent physical property map and the basement rocks information from literature to significantly update the tectonic map of Botswana, which shows the spatial extent of the geological units beneath the Kalahari sedimentary cover. The new map gives an insight into the geodynamics of Botswana crust.
引用
收藏
页码:919 / 933
页数:15
相关论文
共 64 条
[1]   THE MOTLOUTSE COMPLEX AND THE ZIMBABWE CRATON LIMPOPO BELT TRANSITION IN BOTSWANA [J].
ALDISS, DT .
PRECAMBRIAN RESEARCH, 1991, 50 (1-2) :89-109
[2]   THE GEOLOGY AND REGIONAL CORRELATION OF THE PROTEROZOIC OKWA INLIER, WESTERN BOTSWANA [J].
ALDISS, DT ;
CARNEY, JN .
PRECAMBRIAN RESEARCH, 1992, 56 (3-4) :255-274
[3]  
[Anonymous], 1985, UTILITY REGIONAL GRA
[4]   The lithospheric architecture of Africa: Seismic tomography, mantle petrology, and tectonic evolution [J].
Begg, G. C. ;
Griffin, W. L. ;
Natapov, L. M. ;
O'Reilly, Suzanne Y. ;
Grand, S. P. ;
O'Neill, C. J. ;
Hronsky, J. M. A. ;
Djomani, Y. Poudjom ;
Swain, C. J. ;
Deen, T. ;
Bowden, P. .
GEOSPHERE, 2009, 5 (01) :23-50
[5]  
Bertrand H., 2002, EARTH PLANET SC LETT, V202, P595
[6]  
Blakely R., 1995, POTENTIAL FIELD MAGN
[7]   Antarctic crustal thickness from satellite gravity: Implications for the Transantarctic and Gamburtsev Subglacial Mountains [J].
Block, Adrienne E. ;
Bell, Robin E. ;
Studinger, Michael .
EARTH AND PLANETARY SCIENCE LETTERS, 2009, 288 (1-2) :194-203
[8]  
Carney J.N., 1994, B BOTSWANA, V37
[9]  
Carney J.N., 1991, Botsw. J. Earth Sci., V1, P1
[10]  
Chisenga C.M., 2015, THESIS