板块假说上大陆后所面临的几个问题
SOME PROBLEMS BEFORE US WHEN THE PLATE-TECTONIC THEORY IS APPLIED IN INTERPRETING CONTINENTAL GEOLOGY
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摘要: 本文就运用板块构造理沦,在分析研究大陆壳的地质构造特征及其演化历史时,所遇到的几个主要问题,进行了概略阐述。并就近年来,在板块构造研究中出现的如:地幔柱、A型俯冲、地体…等新模式,作了简要的介绍。Abstract: Can we correctly interpret the features of continental geology by the plate-tectonic theory based on the results of the marine geological surveys and some geophysical studies? What are the trend of development and future of palate tectonics? This is a question of common interest to us. The "classic" plate-tectonic theory is facing the problems in interpreting the lengthy and complex continental crustal geology. The following problems are discussed by the author: （1） what geological periods are suited to be interpreted from the view-point of plate tectonics; （2） subdivision of a plate, time of plate motion and tectonic settings; （3） problems of subauction zones; （4） mobile belts in the interior of plates; （5） plate and geosyncline. Though this theory does not illustrate all the features of continental crust, it still has great vitality and represents the advance of earth science. The author thinks that under the guidance of the concept of plate tectonics we should look for more flexible and subsidiary models in order to perfect this theory. The following models are discussed: （1） model of mantle plume; （2） model of A-type subduction; （3） model of structural-stratigraphic terranes; （4） model of earth expansion and pulsation. Finally, six conclusions and suggestions are proposed.
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