Аннотация
The late Proterozoic Arabian Shield is composed of at least five geologically
distinct terranes (microplates) separated by four ophiolite-bearing
suture zones. Three ensimatic island-arc terranes occur in the western
shield, whereas the two terranes in the eastern shield have continental
affinities. The western two sutures are island-arc-island-arc joins,
whereas the eastern two sutures collectively form a major coilisional
orogenic belt. Accretion of the five terranes to form an Arabian
neocraton occurred from 715 to 630 Ma. After accretion, intracratonic
deformation and magmatism related to collision continued and resulted
in the formation of molasse, intermediate to silicic volcanic rocks,
peralka-line to peraluminous granites (640-570 Ma), and a major left-lateral
wrench fault system (630-550 Ma) which displaced the northern part
of the Arabian neocraton 250 km to the northwest. These tectonic
events represent the accretion of the Arabian portion of Gondwanaland
during the Pan-African event.
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