广东台山海岸带构造特征研究

Structure Characteristics of Taishan Coast in Guangdong

为了有效地开展海岸带覆盖区1∶5万试点填图,特此进行广东台山沿海构造特征研究。在野外地质调查的基础上,通过对测区沉积建造、变质变形、深部构造特征等方面研究,初步得出早古生代大地构造背景更倾向于裂陷槽;依据岩石建造与改造、变质变形特征、岩浆发育特点以及角度不整合接触关系,将测区构造层自下而上、自老而新依次划分为:加里东运动构造层、华力西-印支运动构造层、燕山-喜山运动构造层,并对各构造层进行了分析研究;初步分析了沉积作用、岩浆作用、变质作用对构造事件的响应;调查研究成果对下步海岸带覆盖区填图工作将起着积极的指导作用。

In order to effectively guide the 1 ： 50000 geological mapping of coastal zone, the structure characteristics of Taishan coast in Guangdong have been studied. Based on the field in vestigation, the sedimentary formation, metamorphism, deformation and deep tectonic character istics of this area have been studied. It is preliminarily concluded that the early Paleozoic tectonic setting is more inclined to the rift trough than the so called massif. According to the rock con struction and transformation, metamorphic deformation characteristics, structural magmatic de velopment characteristics and angle unconformity contact relationship, the tectonic layers of the survey area have been classified into three layers from bottom to top and from old to young, that is, Caledonian tectonic layer, Hercynian Indosinian tectonic layer, and Yanshan Himalayan tec tonic layer. And then, the responses of sedimentation , magmatism and metamorphism to tectonic movement have been preliminarily analyzed. The result of the investigations and study plays a positive role in guiding the further work of geological mapping.