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- W1992850489 abstract "The Adola area of Southern Ethiopia comprises two main tectono-stratigraphic units which have undergone polyphase deformation and regional metamorphism. The first one consists of an heterogeneous sequence of high grade and complexly deformed gneisses which are intruded by syn- and post-tectonic granitoids; the second unit comprises an extemsive N-S trending volcano-sedimentary sequence and ultrabasic rocks of greenschist to amphibolite facies metamorphic grade and relatively simple deformation state. The contact between the two units is usually extensively tectonized. Recent structural analysis of the Adola Belt shows that: (1) the tectonic evolution started with extensional faulting and development of basin into which volcano-sedimentary sequence and associated ultrabasic suites were deposited, (2) the first stage compressional event led to the inversion of the Precambrian sedimentary basin and development of thrust tectonics and associated folding phase with sub-horizontal axes and (3) the late-stage in the tectonic evolution is dominated by N-S trending sub-vertical ductile strike-slip shear zones and related sub-vertical folds. The thrust and strike-slip shear belts are up to 500 m wide and occur both within the units defined above and along their boundaries reactivating previous N-S trending discontinuities. These reactivation events locally segment the sequence into five fault-bound tectonic domains each with different deformation style. The shear zones are characterized by the extensive development of mylonitic fault rocks which carry strong superimposed stretching lineations indicating their respective tectonic transport directions. Sense of displacement in all types of shear zones is indicated by shear criteria. The field character of the belt suggests that it is underlain by sialic basement and that it developed from an ensialic basin and not from Wilson cycle plate tectonic processes." @default.
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- W1992850489 date "1992-01-01" @default.
- W1992850489 modified "2023-09-27" @default.
- W1992850489 title "The tectonic evolution of the Precambrian metamorphic rocks of the Adola Belt (Southern Ethiopia)" @default.
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- W1992850489 doi "https://doi.org/10.1016/0899-5362(92)90054-g" @default.
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