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Ensialic origin for the Ngezi group, Belingwe greenstone-belt,Zimbabwe

Blenkinsop, Thomas G. ORCID:, Fedo, C. M., Bickle, M. J., Eriksson, K. A., Martin, A., Nisbet, E. G. and Wilson, J. F. 1993. Ensialic origin for the Ngezi group, Belingwe greenstone-belt,Zimbabwe. Geology 21 (12) , pp. 1135-1138. 10.1130/0091-7613(1993)021<1135:EOFTNG>2.3.CO;2

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: Q Science > QE Geology
Publisher: Geological Society of America
ISSN: 0091-7613
Last Modified: 24 Oct 2022 12:08

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