Victoria continental microplate dynamics controlled by the lithospheric strength distribution of the East African Rift.

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 Commun

journal_title

Nature communications

authors

Glerum A,Brune S,Stamps DS,Strecker MR

doi

10.1038/s41467-020-16176-x

subject

Has Abstract

pub_date

2020-06-08 00:00:00

pages

2881

issue

1

issn

2041-1723

pii

10.1038/s41467-020-16176-x

journal_volume

11

pub_type

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