Fault kinematics and stress fields in the Rwenzori Mountains, Uganda

被引:0
|
作者
Till Sachau
Daniel Koehn
D. Sarah Stamps
Michael Lindenfeld
机构
[1] Eberhard Karls University,Department of Geosciences
[2] University of Glasgow,School of Geographical & Earth Sciences
[3] Massachusetts Institute of Technology,Department of Earth, Atmospheric, and Planetary Sciences
[4] University of California,Department of Earth, Planetary and Space Sciences
[5] Goethe-Universität Frankfurt,Institut für Geowissenschaften
来源
International Journal of Earth Sciences | 2016年 / 105卷
关键词
Rwenzori; East African Rift System; Stress field; Stress inversion; Tectonics; Kinematics;
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学科分类号
摘要
The Rwenzori Mountains in western Uganda form an active rift-transfer zone in the western branch of the East African Rift System. Here we quantify local stress fields in high resolution from field observations of fault structures to shed light on the complex, polyphase tectonics expected in transfer zones. We apply the multiple inverse method, which is optimized for heterogeneous fault-slip data, to the northern and central Rwenzori Mountains. Observations from the northern Rwenzori Mountains show larger heterogeneity than data from the central Rwenzori, including unexpected compressional features; thus the local stress field indicates polyphase transpressional tectonics. We suggest that transpression here is linked to rotational and translational movements of the neighboring Victoria block relative to the Rwenzori block that includes strong overprinting relationships. Stress inversions of data from the central Rwenzori Mountains indicate two distinct local stress fields. These results suggest that the Rwenzori block consists of smaller blocks.
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页码:1729 / 1740
页数:11
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