论文部分内容阅读
二郎坪弧后盆地是北秦岭早古生代活动大陆边缘沟－弧－盆系统的重要组成部分，现今二郎坪岩群是古弧后盆地的物质残存，记录了盆地演化方式和过程。沉积建造和岩浆作用研究发现，在二郎坪弧后盆地南北两侧各发育一套活动型陆缘沉积体系和一系列府冲型花岗岩；变形构造解析反映出主造山期早期沿弧后盆地两侧各形成一套韧性推覆构造系，并具对冲型几何学样式，为俯冲带典型构造。综合分析表明，弧后盆地在造山早期分别俯冲于南部秦岭古岛弧和北部宽坪古陆之下，具双向式俯冲特征。
The Erlangping back-arc basin is an important part of the continental marginal gutter-arc-basin system of the Early Paleozoic activities in the North Qinling. Today, Erlangping rock group is a material remnant of the Paleo-arc back-basins and records the evolutionary process and mode of the basin. Sedimentary and magmatism studies show that there are a set of active-type continental margin sedimentary systems and a series of red-type granites developed on both north and south sides of Erlangping arc-back basin. Deformational tectonic analysis shows that along the back of the main orogenic period, Each formed a ductile nappe structure system, and hedging geometry style, is a typical structure of subduction zone. The comprehensive analysis shows that the backarc basin subducted in the early stage of orogeny under the ancient island arc of Qinling in the south and the ancient land in the north of Kuanping, respectively.