摘要
本文系采用历史分析法对海南岛的沉积建造、岩浆建造、变质作用、构造型相进行分析.可将其地壳演化划分为前地槽、地槽、烛台、地洼四个发展阶段;采用动力分析法把具有成生联系的构造成分归为一起。作者认为海南岛存在着古北东,古东西、北北东、南北构造系和环状构造系:用历史和动力综合分析法全面探讨海南岛地壳演化与构造格局变迁特点。可得出结论:其前地槽发展阶段受北东古构造系控制,于地槽发展阶段叠加了东西古构造系:地洼初动期北北东构造系又疊加在东西古构造系之上并产生复合;地洼激烈期北北东向构造系与东西构造系产生联合环状构造系:地洼余动期的东西构造系和南北构造系又先后叠加在环状构造系之上.海南岛地壳在长期复杂多阶段的演化过程中,曾几经左,右旋交替的剪切作用,最终导致形成海南岛环形块体.
This paper analysis asedimentary and magmatic formations, metamorphism and structural feature in Hainan Island using the historic analysis method. The crustal evolution of the area can be divided into four stages, pre-geosynclinal, geosynclinal, platform and diwa; Classifying genetically related structures using the dy- namic analysis method, the author points out that there are four kinds of tectonic systems: NE, E, NNE and N-trending, and ring structure. Dealing with the crustal evolution and the vicissitudes of the tectonic framework in Hainan Island using the synthetic analysis method, the following conclusions can be drawn: the pre-geosynclinal stages was controlled by an NE-trending tectonic system, on which an E-trending tectonic system was superimposed during the geosynclinal stage. In the maximum-mobility period of diwa stage, an NNE-trending tectonic system was superimposed on the E-trending tectonic systen and resulted in compounding. In the maximum-mobility period of diwa stage, the NNE-and E-trendind tectonic systems producted a joint ring structure, on which an E-and an N-trending tectonic systems were superimposed in the residual-mobility period of diwa stage. During the long, complicated and multistage crustal evolution, Hainan Island has alternately experienced left-lateral and right-lateral shear movements. Finally, the Hainan ring block was formed.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1992年第2期131-140,共10页
Geotectonica et Metallogenia
基金
中国科学院重中之重黄金项目
关键词
海南岛
地壳
演化
构造系
tectonic region, tectonic system, tectonic evolution and vicissitudes of tectonic framework, Hainan Island, China
