• journal_title：Geology
• Contributor：Tom G. Blenkinsop ; Christopher M. Fedo ; Michael J. Bickle ; Kenneth A. Eriksson ; Anthony Martin ; Euan G. Nisbet ; James F. Wilson
• Publisher：Geological Society of America
• Date：1993-
• Format：text/html
• Language：en
• Identifier：10.1130/0091-7613(1993)021<1135:EOFTNG&gt;2.3.CO;2
• journal_abbrev：Geology
• issn：0091-7613
• volume：21
• issue：12
• firstpage：1135

Volcanic rocks of the Ngezi Group in the Belingwe greenstone belt have been interpreted as continental basalts extruded onto, or oceanic crust obducted onto, a succession of stable-shelf sedimentary rocks that nonconformably overlie continental basement. The volcanic succession locally contains quartzose sandstones, and the stratigraphy is unlike ocean crust. Primary volcanic and sedimentary structures indicate a shallow-subaqueous to subaerial origin. All structural features are compatible with later refolding of an autochthonous successon; there is no structural manifestation of obduction. These criteria refute an oceanic setting for the volcanic rocks; rather, they are consistent with an ensialic origin for the Ngezi Group.