【摘要】 本区蓝片岩主要分布于中一上元古界,在古生界中也有少量分布,具同期多阶段生成特点,并与钠长石、黑硬绿泥石、多硅白云母等应力矿物共生。印支运动初期,扬于板块向北发生陆内俯冲,所产生的深层次韧性滑脱一推覆剪切应变,形成的低温高压变质作用,是本区蓝闪钠长石化变质带生成的特定构造条件。蓝闪石片岩是南秦岭印支—燕山造山带重要构造标志之一。更多还原

【Abstract】 The blueschists are developed in the suture zones between the North China plate and South China plate, Southern Qinling orogene, which is located in the meeting area of Hubei, Henan and Shanxi provinces. Glaucophane in the blueschists, occurred in the rocks from the Mid-Upper Proterozoic to Palaeozoic and characterized by forming in multiple epochs or stages, paragenesizes with stress-minerals such as albite, stilpnomelanite and phengite. It is a special tectonic condition for forming glaucophane-albitization metamorphic belt in this area that the metamorphism of low temperatute and high pressure caused by the strain of the ductile decoupling-thrust shearing in deep levels, resulting from the intercontinental subduction of the South China plate northwards down the North China plate, in the early e-poch of Indosinian movement.更多还原