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The Sagatu Ridge dike swarm, Ethiopian rift marginA swarm of dikes forms the core of the Sagatu Ridge, a 70-km-long topographic feature elevated to more than 4000 m above sea level and 1500 m above the level of the Eastern (Somalian) plateau. The ridge trends NNE and lies about 50 km east of the northeasterly trending rift-valley margin. Intrusion of the dikes and buildup of the flood-lava pile, largely hawaiitic but with trachyte preponderant in the final stages, occurred during the late Pliocene-early Pleistocene and may have been contemporaneous with downwarping of the protorift trough to the west. The ensuing faulting that formed the present rift margin, however, bypassed the ridge. The peculiar situation and orientation of the Sagatu Ridge, and its temporary existence as a line of crustal extension and voluminous magmatism, are considered related to a powerful structural control by a major line of Precambrian crustal weakness, well exposed further south. Transverse rift structures of unknown type appear to have limited the development of the ridge to the north and south.
Document ID
19770028469
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mohr, P. A.
(Harvard College Observatory and Smithsonian Astrophysical Observatory Cambridge, Mass., United States)
Potter, E. C.
(Marathon Oil Co. Casper, Wyo., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1976
Publication Information
Publication: Journal of Volcanology and Geothermal Research
Volume: 1
Subject Category
Earth Resources And Remote Sensing
Accession Number
77A11321
Funding Number(s)
CONTRACT_GRANT: NAS5-21748
Distribution Limits
Public
Copyright
Other

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