Abstract:
:The Victoria microplate between the Eastern and Western Branches of the East African Rift System is one of the largest continental microplates on Earth. In striking contrast to its neighboring plates, Victoria rotates counterclockwise with respect to Nubia. The underlying cause of this distinctive rotation has remained elusive so far. Using 3D numerical models, we investigate the role of pre-existing lithospheric heterogeneities in continental microplate rotation. We find that Victoria's rotation is primarily controlled by the distribution of rheologically stronger zones that transmit the drag of the major plates to the microplate and of the mechanically weaker mobile belts surrounding Victoria that facilitate rotation. Our models reproduce Victoria's GPS-derived counterclockwise rotation as well as key complexities of the regional tectonic stress field. These results reconcile competing ideas on the opening of the rift system by highlighting differences in orientation of the far-field divergence, local extension, and the minimum horizontal stress.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Glerum A,Brune S,Stamps DS,Strecker MRdoi
10.1038/s41467-020-16176-xsubject
Has Abstractpub_date
2020-06-08 00:00:00pages
2881issue
1issn
2041-1723pii
10.1038/s41467-020-16176-xjournal_volume
11pub_type
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