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前言近几年来,已提出了多种解释太古宙构造型式的设想,这些设想通常是根据模拟当代板块构造过程而得出的。这类模式的着眼点往往偏重干地球化学或岩石成因方面,而比较忽视构造方面的证据。在高级片麻岩地体中,存在着近水平的高应变构造的成因这样一个特殊问题,这个问题同经典的俯冲或碰撞驱动地壳构造的理论很难一致。然而,一些作者认为,直到晚前寒武纪时,作为当代板块构造学说所要求的岩石圈的俯冲才开始出现。如果这一观点是正确的,那么均一的板块构造过程就不适用于太古宙了。因而
INTRODUCTION In recent years, a number of ideas have been proposed to explain the Archean tectonic patterns, which are usually based on simulations of contemporary plate tectonics. The focus of such models tends to favor dry geochemistry or rock genesis, while ignoring structural evidence. In the advanced gneiss, there is a particular problem with the genesis of near-horizontal high-strain tectonics, a problem that is very difficult to reconcile with the classical theory of subduction or collision-driven crustal structures. However, some authors believe that the subduction of the lithosphere required by contemporary plate tectonics did not begin until the late Precambrian period. If this view is correct, a uniform plate tectonic process does not apply to Archean. thus