Evolution of the Slave craton: comment

Article Abstract:

A 1994 study by C.E. Isachsen and S.A. Bowring on the evolution of the Slave craton tackles the problem of how a tectonically active environment can give rise to undeformed and unmetamorphosed greenstone belts. Isachsen and Bowman attributes the formation of these belts to the graywacke-mudstone, or graystone, that cover part of the Slave craton. However, the assumption that these belts are turbidities may be incorrect since they have not been widely studied. Based on evidence gathered by researchers, it could be concluded that the Slave craton had been existing long before the graystone.

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Pb isotopes of granitoids suggest Devonian accretion of Yangtze (South China) craton to North China craton: comment and reply

Article Abstract:

Zhang et al (1997) suggested that the Yangtze craton accreted to the North China craton based on the tectonic model of the Qinling orogenic belt. However, the data interpretation presented by the authors was not unique. Previous studies had shown that changes in Pb isotopic compositions for granitoids in the orogenic belt developed from north to south, which was most likely a result of the subduction of the North China craton under the North Qinling arc. Evidences were presented on the use of Devonian collision in explaining these changes.

China, Geology, Stratigraphic, Stratigraphy, Tin, Devonian period, Yangtze River region, Zhang, Hong-Fei

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Northward expulsion of the Pan-African of northeast Africa guided by a reentrant zone of the Tanzania craton

Article Abstract:

Higher grade Neoproterozoic rocks from the Mozambique orogen lie beside lower grade Arabian-Nubian sheild in southern Ethiopia and northern Kenya. Collision with the Tanzanian and Eastern Saharan cratons formed a transition zone representing the source of Arabian-Nubian shield expulsion from the Mozambique orogen, guided by subvertical or flat-lying faults. The resulting rift complex extended over Pan-African structures. Rifting during the late Mesozoic and Cenozoic was controlled by deformation in this region.

Africa, Geology, Structural, Structural geology, Northern Africa, Rifts (Geology), Africa, North, Shields (Geology)

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