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Secondly, the concept of lineation produced by widespread stretching is a new one in relation to Tanzania. Is such pervasive stretching brought about at a low tectonic level and are the more normal fold structures parallel to the orogenic front characteristic of a higher tectonic position? Where both types of structure are imposed on the same rocks, is this due possibly to substantial vertical movements during the main tectonic events?
In reply the AUTHOR said that he agreed with the distinction made by Harpum between structure in the craton and orogen. This was an expression partly of different lithology and the way in which deformation affected massive, granitoid rocks and layered gneissose rocks respectively, but was also attributable to different degrees of tectonic reworking which rose from a minimum in the stable foreland, through the front where it was probably at a maximum, into the orogenic belt.
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This 250-word extract was created in the absence of an abstract.
