论文部分内容阅读
边缘体系(E.阿甘德提出的术语,拉丁文为liminaris,来源于limen—边界,界限),指安第斯型或巽他型活动大陆边缘。与岛弧体系一样,它们是发生于板块汇聚边界—贝尼奥夫带中和贝尼奥夫带上方的深部作用的反映。其特征是具有巨大的火山—深成岩带,如安第斯的阿劳卡带和鄂霍次克—楚科奇带,以钙碱性系列占优势。根据早中生代生成于联合古陆周缘的边缘体系的资料,确定了边缘体系结构和发展的基本特点。它们的发展业已纳入八大型构造旋回中,并且是按阶段进行的。在早期阶段,一些边缘体系背后形成了伴有拉斑玄武岩喷溢的引张地带。在造山阶段(造山边缘阶段)大陆边缘的拱形抬升产生了一种对应的应力场:在穹窿及其洋侧是引张,与地台的沉降边缘交界处为挤压,形成褶皱及逆掩断层。由于越来越多的硅铝地壳物质参与而生成的钙碱性岩浆的成分也发生了变化。
Marginal system (E. Agambe’s terminology, Latin liminaris, derived from the limen-border, boundary), refers to the Andean or 巽 He-type activity on the continental margin. As with the island arc system, they are a reflection of the deep effects that occur in the plate convergence boundaries - the Benioff and the Benioff bands. It is characterized by its huge volcanic-plutonic belt, such as the Arauca and Okhotsk-Chukchi belts of the Andes, dominated by the calcium-alkaline series. According to the data of the early Mesozoic marginal system that formed in the periphery of the united Palaeozoic, the basic characteristics of the marginal architecture and development were determined. Their development has been integrated into the eight major structural gyrations and carried out on a phase-by-phase basis. In the early stages, some of the marginal systems formed an extension zone with thready basalt spill. The arched uplift at the continental margin during the orogenic phase (orogeny phase) produces a corresponding stress field: an extension at the dome and its oceanic side that is pinched at the junction with the settlement edge of the platform to form folds and inversions Fault. The composition of calc-alkaline magma that is formed as a result of more and more silicon-aluminum crustal material is also changed.